Micro motion 1700 руководство по эксплуатации

Contents

Contents

Contents

Contents

Contents

Getting started

Part I

Getting started

Chapters covered in this part:

•Before you begin

•Quick start

Before you begin

1 Before you begin

Topics covered in this chapter:

•About this manual

•Transmitter model code

•Communications tools and protocols

•Additional documentation and resources

1.1About this manual

This manual helps you configure, commission, use, maintain, and troubleshoot

Micro Motion Model 1700 transmitters with analog outputs.

Important

This manual assumes that the following conditions apply:

•The transmitter has been installed correctly and completely according to the instructions in the transmitter installation manual

•The installation complies with all applicable safety requirements

•The user is trained in local and corporate safety standards

1.2Transmitter model code

You can verify that this manual pertains to your transmitter by ensuring the model code on the transmitter tag matches the format.

Example:

The transmitter has a model number of the following form: 1700(R/I/E/B/C/M/P)**A******

R 4-wire remote-mount with aluminum housing

IIntegral mount

E 4-wire remote mount transmitter with 9-wire remote enhanced core processor

B4-wire remote mount transmitter with 9-wire remote core processor

C 9-wire remote-mount with integral core processor and aluminum housing

M 4-wire remote mount with stainless steel housing

P9-wire remote mount transmitter with integral core processor and stainless steel housing

A Analog outputs option board

Before you begin

1.3Communications tools and protocols

You can use several different communications tools and protocols to interface with the transmitter, use different tools in different locations, or use different tools for different tasks.

For information about how to use the communication tools, see the appendices in this manual.

Tip

You may be able to use other communications tools, such as AMS Suite: Intelligent Device Manager, or the Smart Wireless THUM™ Adapter. Use of AMS or the Smart Wireless THUM Adapter is not discussed in this manual. For more information on the Smart Wireless THUM Adapter, refer to the documentation available at www.emerson.com.

1.4Additional documentation and resources

All documentation resources are available at www.emerson.com or on the user documentation DVD.

Quick start

2 Quick start

Topics covered in this chapter:

•Power up the transmitter

•Check meter status

•Make a startup connection to the transmitter

•(Optional) Adjust digital communications settings

•Verify mass flow measurement

•Verify the zero

2.1Power up the transmitter

The transmitter must be powered up for all configuration and commissioning tasks, or for process measurement.

1.Ensure that all transmitter and sensor covers and seals are closed.

DANGER!

To prevent ignition of flammable or combustible atmospheres, ensure that all covers and seals are tightly closed. For hazardous area installations, applying power while housing covers are removed or loose can cause an explosion.

2.Turn on the electrical power at the power supply.

The transmitter will automatically perform diagnostic routines. The transmitter is self-switching and will automatically detect the supply voltage. When using DC power, a minimum of 1.5 amps of startup current is required. During this period, Alert 009 is active. The diagnostic routines should complete in approximately

30 seconds. For transmitters with a display, the status LED will turn green and begin to flash when the startup diagnostics are complete. If the status LED exhibits different behavior, an alert is active.

Postrequisites

Although the sensor is ready to receive process fluid shortly after power-up, the electronics can take up to 10 minutes to reach thermal equilibrium. Therefore, if this is the initial startup, or if power has been off long enough to allow components to reach ambient temperature, allow the electronics to warm up for approximately 10 minutes before relying on process measurements. During this warm-up period, you may observe minor measurement instability or inaccuracy.

Quick start

2.2Check meter status

Check the meter for any error conditions that require user action or that affect measurement accuracy.

1.Wait approximately 10 seconds for the power-up sequence to complete.

Immediately after power-up, the transmitter runs through diagnostic routines and checks for error conditions. During the power-up sequence, Alert A009 is active. This alert should clear automatically when the power-up sequence is complete.

2.Check the status LED on the transmitter.

Related information

View and acknowledge status alerts

2.2.1Transmitter status reported by LED

Table 2-1: Transmitter status reported by status LED

If Status LED Blinking is disabled, all LEDs will show a solid color rather than flashing.

Quick start

2.3Make a startup connection to the transmitter

For all configuration tools except the display, you must have an active connection to the transmitter to configure the transmitter. Follow this procedure to make your first connection to the transmitter.

Identify the connection type to use, and follow the instructions for that connection type in the appropriate appendix. Use the default communications parameters shown in the appendix.

2.4(Optional) Adjust digital communications settings

Change the communications parameters to site-specific values.

Important

If you are changing communications parameters for the connection type that you are using, you will lose the connection when you write the parameters to the transmitter. Reconnect using the new parameters.

Procedure

1.To change the communications parameters using ProLink III, choose Device Tools > Configuration > Communications.

2.To change the communications parameters using the Field Communicator, choose On-Line Menu > Configure > Manual Setup > Inputs/Outputs > Communications.

2.5Verify mass flow measurement

Check to see that the mass flow rate reported by the transmitter is accurate. You can use any available method.

•Read the value for Mass Flow Rate on the transmitter display.

•Connect to the transmitter with ProLink III and read the value for Mass Flow Rate in the Process Variables panel.

•Connect to the transmitter with the Field Communicator and read the value for Mass Flow Rate.

Quick start

On-Line Menu > Overview > Primary Purpose Variables

Postrequisites

If the reported mass flow rate is not accurate:

•Check the characterization parameters.

•Review the troubleshooting suggestions for flow measurement issues.

2.6Verify the zero

Verifying the zero helps you determine if the stored zero value is appropriate to your installation, or if a field zero can improve measurement accuracy.

The zero verification procedure analyzes the Live Zero value under conditions of zero flow, and compares it to the Zero Stability range for the sensor. If the average Live Zero value is within a reasonable range, the zero value stored in the transmitter is valid. Performing a field calibration will not improve measurement accuracy.

Important

In most cases, the factory zero is more accurate than the field zero. Do not zero the meter unless one of the following is true:

•The zero is required by site procedures.

•The stored zero value fails the zero verification procedure.

Procedure

1.Allow the flowmeter to warm up for at least 20 minutes after applying power.

2.Run the process fluid through the sensor until the sensor temperature reaches the normal process operating temperature.

3.Stop flow through the sensor by shutting the downstream valve, and then the upstream valve if available.

4.Verify that the sensor is blocked in, that flow has stopped, and that the sensor is completely full of process fluid.

5.From ProLink III, choose Device Tools > Calibration > Zero Verification and Calibration > Verify Zero and wait until the procedure completes.

6.Observe the drive gain, temperature, and density readings. If they are stable, check the Live Zero or Field Verification Zero value. If the average value is close to 0, you should not need to zero the meter.

7.If the zero verification procedure fails:

a.Confirm that the sensor is completely blocked in, that flow has stopped, and that the sensor is completely full of process fluid.

b.Verify that the process fluid is not flashing or condensing, and that it does not contain particles that can settle out.

c.Remove or reduce sources of electromechanical noise if appropriate.

Quick start

d.Repeat the zero verification procedure.

e.If it fails again, zero the meter.

Postrequisites

Restore normal flow through the sensor by opening the valves.

Related information

Zero the meter

2.6.1Terminology used with zero verification and zero calibration

Configuration and commissioning

Part II

Configuration and commissioning

Chapters covered in this part:

•Introduction to configuration and commissioning

•Configure process measurement

•Configure device options and preferences

•Integrate the meter with the control system

•Complete the configuration

Introduction to configuration and commissioning

3 Introduction to configuration and commissioning

Topics covered in this chapter:

•Configuration flowchart

•Default values and ranges

•Enable access to the off line menu of the display

•Disable write protection on the transmitter configuration

•Restore the factory configuration

3.1Configuration flowchart

Use the following flowchart as a general guide to the configuration and commissioning process.

Some options may not apply to your installation. Detailed information is provided in the remainder of this manual. If you are using the Weights & Measures application, additional configuration and setup are required.

Introduction to configuration and commissioning

3.2Default values and ranges

See Section D.1 to view the default values and ranges for the most commonly used parameters.

3.3Enable access to the off-line menu of the display

Overview

By default, access to the off-line menu of the display is enabled. If it is disabled, you must enable it if you want to use the display to configure the transmitter.

Restriction

You cannot use the display to enable access to the off-line menu. You must make a connection from another tool.

3.4Disable write-protection on the transmitter configuration

Overview

If the transmitter is write-protected, the configuration is locked and you must unlock it before you can change any configuration parameters. By default, the transmitter is not write-protected.

Tip

Write-protecting the transmitter prevents accidental changes to configuration. It does not prevent normal operational use. You can always disable write-protection, perform any required configuration changes, then re-enable write-protection.

Introduction to configuration and commissioning

3.5Restore the factory configuration

Overview

Restoring the factory configuration returns the transmitter to a known operational configuration. This may be useful if you experience problems during configuration.

Important

You cannot restore factory configurations with a 700 core.

Tip

Restoring the factory configuration is not a common action. You may want to contact customer support to see if there is a preferred method to resolve any issues.

Configure process measurement

4 Configure process measurement

Topics covered in this chapter:

•Configure mass flow measurement

•Configure volume flow measurement for liquid applications

•Configure GSV flow measurement

•Configure Flow Direction

•Configure density measurement

•Configure temperature measurement

•Configure pressure compensation

4.1Configure mass flow measurement

The mass flow measurement parameters control how mass flow is measured and reported.

4.1.1Configure Mass Flow Measurement Unit

Overview

Mass Flow Measurement Unit specifies the unit of measure that will be used for the mass flow rate. The unit used for mass total and mass inventory is derived from this unit.

Any selected measurement unit, (mass, volume or gas standard volume), is automatically applied to both the mA and Frequency Outputs.

Procedure

Set Mass Flow Measurement Unit to the unit you want to use.

The default setting for Mass Flow Measurement Unit is g/sec (grams per second).

Tip

If the measurement unit you want to use is not available, you can define a special measurement unit.

Configure process measurement

Options for Mass Flow Measurement Unit

The transmitter provides a standard set of measurement units for Mass Flow Measurement Unit, plus one user-defined special measurement unit. Different communications tools may use different labels for the units.

Configure process measurement

Define a special measurement unit for mass flow

Overview

A special measurement unit is a user-defined unit of measure that allows you to report process data, totalizer data, and inventory data in a unit that is not available in the transmitter. A special measurement unit is calculated from an existing measurement unit using a conversion factor.

Note

Although you cannot define a special measurement unit using the display, you can use the display to select an existing special measurement unit, and to view process data using the special measurement unit.

Procedure

1.Specify Base Mass Unit.

Base Mass Unit is the existing mass unit that the special unit will be based on.

2.Specify Base Time Unit.

Base Time Unit is the existing time unit that the special unit will be based on.

3.Calculate Mass Flow Conversion Factor as follows:

a.x base units = y special units

b.Mass Flow Conversion Factor = x ÷ y

The original mass flow rate value is divided by this value.

4.Enter Mass Flow Conversion Factor.

5.Set Mass Flow Label to the name you want to use for the mass flow unit.

6.Set Mass Total Label to the name you want to use for the mass total and mass inventory unit.

The special measurement unit is stored in the transmitter. You can configure the transmitter to use the special measurement unit at any time.

Example: Defining a special measurement unit for mass flow

You want to measure mass flow in ounces per second (oz/sec).

1.Set Base Mass Unit to Pounds (lb).

2.Set Base Time Unit to Seconds (sec).

3.Calculate Mass Flow Conversion Factor:

Configure process measurement

a.1 lb/sec = 16 oz/sec

b.Mass Flow Conversion Factor = 1 ÷ 16 = 0.0625

4.Set Mass Flow Conversion Factor to 0.0625.

5.Set Mass Flow Label to oz/sec.

6.Set Mass Total Label to oz.

4.1.2Configure Flow Damping

Overview

Damping is used to smooth out small, rapid fluctuations in process measurement. Damping Value specifies the time period (in seconds) over which the transmitter will spread changes in the process variable. At the end of the interval, the internal value will reflect 63% of the change in the actual measured value.

Procedure

Set Flow Damping to the value you want to use.

The default value is 0.8 seconds. The range depends on the core processor type and the setting of Update Rate, as shown in the following table.

The value you enter is automatically rounded off to the nearest valid value. For example, if the damping is currently set to 0.8 seconds, any value entered up to 1.2 seconds will be rounded down to 0.8 seconds, and any value entered from 1.21 to 1.59 seconds will be rounded up to 1.6 seconds.

Configure process measurement

Effect of flow damping on volume measurement

Flow damping affects volume measurement for liquid volume data. Flow damping also affects volume measurement for gas standard volume data. The transmitter calculates volume data from the damped mass flow data.

Interaction between Flow Damping and mA Output Damping

In some circumstances, both Flow Damping and mA Output Damping are applied to the reported mass flow value.

Flow Damping controls the rate of change in flow process variables. mA Output Damping controls the rate of change reported via the mA Output. If mA Output Process Variable is set to Mass Flow Rate, and both Flow Damping and mA Output Damping are set to non-zero values, flow damping is applied first, and the added damping calculation is applied to the result of the first calculation.

4.1.3Configure Mass Flow Cutoff

Overview

Mass Flow Cutoff specifies the lowest mass flow rate that will be reported as measured. All mass flow rates below this cutoff will be reported as 0.

Procedure

Set Mass Flow Cutoff to the value you want to use.

The default value for Mass Flow Cutoff is 0.0 g/sec or a sensor-specific value set at the factory. The recommended value is 0.5% of the nominal flow rate of the attached sensor. See the sensor specifications. Leaving Mass Flow Cutoff at 0.0 g/sec is not recommended.

Effect of Mass Flow Cutoff on volume measurement

Mass Flow Cutoff does not affect volume measurement. Volume data is calculated from the actual mass data rather than the reported value.

Volume flow has a separate Volume Flow Cutoff that is not affected by the Mass Flow Cutoff value.

Configure process measurement

Interaction between Mass Flow Cutoff and mA Output Cutoff

Mass Flow Cutoff defines the lowest mass flow value that the transmitter will report as measured. mA Output Cutoff defines the lowest flow rate that will be reported via the mA output. If mA Output Process Variable is set to Mass Flow Rate, the mass flow rate reported via the mA Output is controlled by the higher of the two cutoff values.

Mass Flow Cutoff affects all reported values and values used in other transmitter behavior (e.g., events defined on mass flow).

mA Output Cutoff affects only mass flow values reported via the mA Output.

Example: Cutoff interaction with mA Output Cutoff lower than Mass Flow Cutoff

Configuration:

•mA Output Process Variable: Mass Flow Rate

•Frequency Output Process Variable: Mass Flow Rate

•mA Output Cutoff: 10 g/sec

•Mass Flow Cutoff: 15 g/sec

Result: If the mass flow rate drops below 15 g/sec, mass flow will be reported as 0, and 0 will be used in all internal processing.

Example: Cutoff interaction with mA Output Cutoff higher than Mass Flow Cutoff

Configuration:

•mA Output Process Variable: Mass Flow Rate

•Frequency Output Process Variable: Mass Flow Rate

•mA Output Cutoff: 15 g/sec

•Mass Flow Cutoff: 10 g/sec

Result:

•If the mass flow rate drops below 15 g/sec but not below 10 g/sec:

—The mA Output will report zero flow.

—The Frequency Output will report the actual flow rate, and the actual flow rate will be used in all internal processing.

•If the mass flow rate drops below 10 g/sec, both outputs will report zero flow, and 0 will be used in all internal processing.

4.2Configure volume flow measurement for liquid applications

The volume flow measurement parameters control how liquid volume flow is measured and reported.

Configure process measurement

Restriction

You cannot implement both liquid volume flow and gas standard volume flow at the same time. Choose one or the other.

Note

If you need to switch from gas standard volume to liquid volume, polling for base density will automatically be disabled.

4.2.1Configure Volume Flow Type for liquid applications

Overview

Volume Flow Type controls whether liquid or gas standard volume flow measurement will be used.

Restriction

Gas standard volume measurement is incompatible with some applications. Set Volume Flow Type to Liquid if you are using any of the following applications:

•Production Volume Reconciliation (PVR)

Procedure

Set Volume Flow Type to Liquid.

4.2.2Configure Volume Flow Measurement Unit for liquid applications

Overview

Volume Flow Measurement Unit specifies the unit of measurement that will be displayed for the volume flow rate. The unit used for the volume total and volume inventory is based on this unit.

Configure process measurement

Prerequisites

Before you configure Volume Flow Measurement Unit, be sure that Volume Flow Type is set to Liquid.

Procedure

Set Volume Flow Measurement Unit to the unit you want to use.

The default setting for Volume Flow Measurement Unit is l/sec (liters per second).

Tip

If the measurement unit you want to use is not available, you can define a special measurement unit.

Options for Volume Flow Measurement Unit for liquid applications

The transmitter provides a standard set of measurement units for Volume Flow Measurement Unit, plus one user-defined measurement unit. Different communications tools may use different labels for the units.

(1)Unit based on oil barrels (42 U.S. gallons).

(2)Unit based on U.S. beer barrels (31 U.S. gallons).

Define a special measurement unit for volume flow

Overview

A special measurement unit is a user-defined unit of measure that allows you to report process data, totalizer data, and inventory data in a unit that is not available in the transmitter. A special measurement unit is calculated from an existing measurement unit using a conversion factor.

Note

Although you cannot define a special measurement unit using the display, you can use the display to select an existing special measurement unit, and to view process data using the special measurement unit.

Procedure

1.Specify Base Volume Unit.

Base Volume Unit is the existing volume unit that the special unit will be based on.

2.Specify Base Time Unit.

Base Time Unit is the existing time unit that the special unit will be based on.

Configure process measurement

3.Calculate Volume Flow Conversion Factor as follows:

a.x base units = y special units

b.Volume Flow Conversion Factor = x ÷ y

4.Enter Volume Flow Conversion Factor.

The original volume flow rate value is divided by this conversion factor.

5.Set Volume Flow Label to the name you want to use for the volume flow unit.

6.Set Volume Total Label to the name you want to use for the volume total and volume inventory unit.

The special measurement unit is stored in the transmitter. You can configure the transmitter to use the special measurement unit at any time.

Example: Defining a special measurement unit for volume flow

You want to measure volume flow in pints per second (pints/sec).

1.Set Base Volume Unit to Gallons (gal).

2.Set Base Time Unit to Seconds (sec).

3.Calculate the conversion factor:

a.1 gal/sec = 8 pints/sec

b.Volume Flow Conversion Factor = 1 ÷ 8 = 0.1250

4.Set Volume Flow Conversion Factor to 0.1250.

5.Set Volume Flow Label to pints/sec.

6.Set Volume Total Label to pints.

4.2.3Configure Volume Flow Cutoff

Overview

Volume Flow Cutoff specifies the lowest volume flow rate that will be reported as measured. All volume flow rates below this cutoff are reported as 0.

Procedure

Set Volume Flow Cutoff to the value you want to use.

The default value for Volume Flow Cutoff is 0.0 l/sec (liters per second). The lower limit is 0.

Configure process measurement

Interaction between Volume Flow Cutoff and mAO Cutoff

Volume Flow Cutoff defines the lowest liquid volume flow value that the transmitter will report as measured. mAO Cutoff defines the lowest flow rate that will be reported via the mA Output. If mA Output Process Variable is set to Volume Flow Rate, the volume flow rate reported via the mA Output is controlled by the higher of the two cutoff values.

Volume Flow Cutoff affects both the volume flow values reported via the outputs and the volume flow values used in other transmitter behavior (e.g., events defined on the volume flow).

mAO Cutoff affects only flow values reported via the mA Output.

Example: Cutoff interaction with mAO Cutoff lower than Volume Flow Cutoff

Configuration:

•mA Output Process Variable: Volume Flow Rate

•Frequency Output Process Variable: Volume Flow Rate

•AO Cutoff: 10 l/sec

•Volume Flow Cutoff: 15 l/sec

Result: If the volume flow rate drops below 15 l/sec, volume flow will be reported as 0, and 0 will be used in all internal processing.

Example: Cutoff interaction with mAO Cutoff higher than Volume Flow Cutoff

Configuration:

•mA Output Process Variable: Volume Flow Rate

•Frequency Output Process Variable: Volume Flow Rate

•AO Cutoff: 15 l/sec

•Volume Flow Cutoff: 10 l/sec

Result:

•If the volume flow rate drops below 15 l/sec but not below 10 l/sec:

—The mA Output will report zero flow.

—The Frequency Output will report the actual flow rate, and the actual flow rate will be used in all internal processing.

•If the volume flow rate drops below 10 l/sec, both outputs will report zero flow, and 0 will be used in all internal processing.

4.3Configure GSV flow measurement

The gas standard volume (GSV) flow measurement parameters control how volume flow is measured and reported in a gas application.

Configure process measurement

Restriction

You cannot implement both liquid volume flow and gas standard volume flow at the same time. Choose one or the other.

4.3.1Configure Volume Flow Type for gas applications

Overview

Volume Flow Type controls whether liquid or gas standard volume flow measurement is used.

Restriction

Gas standard volume measurement is incompatible with some applications. Set Volume Flow Type to Liquid if you are using any of the following applications:

•Production Volume Reconciliation (PVR)

Procedure

Set Volume Flow Type to Gas Standard Volume.

4.3.2Configure Standard Density of Gas

Overview

The Standard Density of Gas value is the gas density at standard reference conditions. Use it to convert the measured mass flow data to volume flow at reference conditions.

Prerequisites

Ensure that Density Measurement Unit is set to the measurement unit you want to use for Standard Density of Gas.

Procedure

From the Source field, choose the method to supply gas base density data and perform the required setup.

Configure fixed value or digital communications

Prerequisites

Section 4.3.2

Procedure

1.Set Standard Density of Gas to the standard reference density of the gas you are measuring.

Note

ProLink III provides a guided method that you can use to calculate your gas base density, if you do not know it.

2.Continue to Section 4.3.3.

Poll for external value

Prerequisites

Section 4.3.2

Procedure

Configure process measurement

•The device being polled (slave) cannot have special units set for density. Otherwise, the master will reject the base density and report the following alarm:

A115: No External Input or Polled Data Alert

•On the slave side, setup the HART Primary Variable for Base Density. The master will reject anything other than Base Density for the HART Primary Variable and trigger an A115 alarm.

•The density units on the transmitter and the polled device can be different as long as they can be classified as density units; for example, kg/m3 and g/cm3. The transmitter converts the polled units into compatible specified units.

For wiring and setup instructions for a polled device, refer to the Micro Motion Gas Density Meters (GDM) Installation manual or the Micro Motion Specific Gravity Meters (SGM) Installation manual.

4. Continue to Section 4.3.3.

4.3.3Configure Gas Standard Volume Flow Unit

Overview

Gas Standard Volume Flow Unit specifies the unit of measure that will be displayed for the gas standard volume flow. The measurement unit used for the gas volume total and the gas volume inventory is derived from this unit.

Prerequisites

Before you configure Gas Standard Volume Flow Unit, be sure that Volume Flow Type is set to Gas Standard Volume.

For polling, the first transmitter (master) requests density from a second transmitter (slave) via HART communications. Special units for GSV are allowed on the master side, but the device being polled (slave) cannot have special units set for density, otherwise the master will reject the base density and report an A115: No External Input or Polled Data Alert.

Procedure

Set Gas Standard Volume Flow Unit to the unit you want to use.

The default setting for Gas Standard Volume Flow Unit is SCFM (Standard Cubic Feet per Minute).

Tip

If the measurement unit you want to use is not available, you can define a special measurement unit.

Configure process measurement

Options for Gas Standard Volume Flow Unit

The transmitter provides a standard set of measurement units for Gas Standard Volume Flow Unit, plus one user-defined special measurement unit. Different communications tools may use different labels for the units.

Define a special measurement unit for gas standard volume flow

Configure process measurement

Overview

A special measurement unit is a user-defined unit of measure that allows you to report process data, totalizer data, and inventory data in a unit that is not available in the transmitter. A special measurement unit is calculated from an existing measurement unit using a conversion factor.

Note

Although you cannot define a special measurement unit using the display, you can use the display to select an existing special measurement unit, and to view process data using the special measurement unit.

Procedure

1.Specify Base Gas Standard Volume Unit.

Base Gas Standard Volume Unit is the existing gas standard volume unit that the special unit will be based on.

2.Specify Base Time Unit.

Base Time Unit is the existing time unit that the special unit will be based on.

3.Calculate Gas Standard Volume Flow Conversion Factor as follows:

a.x base units = y special units

b.Gas Standard Volume Flow Conversion Factor = x ÷ y

4.Enter the Gas Standard Volume Flow Conversion Factor.

The original gas standard volume flow value is divided by this conversion factor.

5.Set Gas Standard Volume Flow Label to the name you want to use for the gas standard volume flow unit.

6.Set Gas Standard Volume Total Label to the name you want to use for the gas standard volume total and gas standard volume inventory unit.

The special measurement unit is stored in the transmitter. You can configure the transmitter to use the special measurement unit at any time.

Example: Defining a special measurement unit for gas standard volume flow

You want to measure gas standard volume flow in thousands of standard cubic feet per minute.

1.Set Base Gas Standard Volume Unit to SCF.

2.Set Base Time Unit to minutes (min).

3.Calculate the conversion factor:

a.1 thousands of standard cubic feet per minute = 1000 cubic feet per minute

b.Gas Standard Volume Flow Conversion Factor = 1 ÷ 1000 = 0.001 standard

4.Set Gas Standard Volume Flow Conversion Factor to 0.001.

5.Set Gas Standard Volume Flow Label to MSCFM.

Configure process measurement

6. Set Gas Standard Volume Total Label to MSCF.

4.3.4Configure Gas Standard Volume Flow Cutoff

Overview

Gas Standard Volume Flow Cutoff specifies the lowest gas standard volume flow rate that will reported as measured. All gas standard volume flow rates below this cutoff will be reported as 0.

Procedure

Set Gas Standard Volume Flow Cutoff to the value you want to use.

The default value for Gas Standard Volume Flow Cutoff is 0.0. The lower limit is 0.0. There is no upper limit.

Interaction between Gas Standard Volume Flow Cutoff and mA Output Cutoff

Gas Standard Volume Flow Cutoff defines the lowest Gas Standard Volume flow value that the transmitter will report as measured. mA Output Cutoff defines the lowest flow rate that will be reported via the mA Output. If mA Output Process Variable is set to Gas Standard Volume Flow Rate, the volume flow rate reported via the mA Output is controlled by the higher of the two cutoff values.

Gas Standard Volume Flow Cutoff affects both the gas standard volume flow values reported via outputs and the gas standard volume flow values used in other transmitter behavior (e.g., events defined on gas standard volume flow).

mA Output Cutoff affects only flow values reported via the mA Output.

Example: Cutoff interaction with mA Output Cutoff lower than Gas Standard Volume Flow Cutoff

Configuration:

•mA Output Process Variable for the primary mA Output: Gas Standard Volume Flow Rate

•Frequency Output Process Variable: Gas Standard Volume Flow Rate

•mA Output Cutoff for the primary mA Output: 10 SLPM (standard liters per minute)

•Gas Standard Volume Flow Cutoff: 15 SLPM

Result: If the gas standard volume flow rate drops below 15 SLPM, the volume flow will be reported as 0, and 0 will be used in all internal processing.

Configure process measurement

Example: Cutoff interaction with mA Output Cutoff higher than Gas Standard Volume Flow Cutoff

Configuration:

•mA Output Process Variable for the primary mA Output: Gas Standard Volume Flow Rate

•Frequency Output Process Variable: Gas Standard Volume Flow Rate

•mA Output Cutoff for the primary mA Output: 15 SLPM (standard liters per minute)

•Gas Standard Volume Flow Cutoff: 10 SLPM

Result:

•If the gas standard volume flow rate drops below 15 SLPM but not below 10 SLPM:

—The primary mA Output will report zero flow.

—The Frequency Output will report the actual flow rate, and the actual flow rate will be used in all internal processing.

•If the gas standard volume flow rate drops below 10 SLPM, both outputs will report zero flow, and 0 will be used in all internal processing.

4.4Configure Flow Direction

Overview

Flow Direction controls how forward flow and reverse flow affect flow measurement and reporting.

Flow Direction is defined with respect to the flow arrow on the sensor:

•Forward flow (positive flow) moves in the direction of the flow arrow on the sensor.

•Reverse flow (negative flow) moves in the direction opposite to the flow arrow on the sensor.

Tip

Micro Motion sensors are bidirectional. Measurement accuracy is not affected by actual flow direction or the setting of the Flow Direction parameter.

Procedure

Set Flow Direction to the value you want to use.

The default setting is Forward.

Configure process measurement

4.4.1Options for Flow Direction

Effect of Flow Direction on mA Outputs

Flow Direction affects how the transmitter reports flow values via the mA Outputs. The mA Outputs are affected by Flow Direction only if mA Output Process Variable is set to a flow variable.

Flow Direction and mA Outputs

The effect of Flow Direction on the mA Outputs depends on Lower Range Value configured for the mA Output:

•If Lower Range Value is set to 0, see Figure 4 1.

•If Lower Range Value is set to a negative value, see Figure 4 2.

Configure process measurement

Figure 4-1: Effect of Flow Direction on the mA Output: Lower Range Value = 0

•Lower Range Value = 0

•Upper Range Value = x

Figure 4-2: Effect of Flow Direction on the mA Output: Lower Range Value < 0

•Lower Range Value = −x

•Upper Range Value = x

Example: Flow Direction = Forward and Lower Range Value = 0

Configuration:

•Flow Direction = Forward

•Lower Range Value = 0 g/sec

•Upper Range Value = 100 g/sec

Configure process measurement

Result:

•Under conditions of zero flow, the mA Output is 4 mA.

•Under conditions of forward flow, up to a flow rate of 100 g/sec, the mA Output varies between 4 mA and 20 mA in proportion to the flow rate.

•Under conditions of forward flow, if the flow rate equals or exceeds 100 g/sec, the mA Output will be proportional to the flow rate up to 20.5 mA, and will be level at 20.5 mA at higher flow rates.

Example: Flow Direction = Forward and Lower Range Value < 0

Configuration:

•Flow Direction = Forward

•Lower Range Value = −100 g/sec

•Upper Range Value = +100 g/sec

Result:

•Under conditions of zero flow, the mA Output is 12 mA.

•Under conditions of forward flow, for flow rates between 0 and +100 g/sec, the mA Output varies between 12 mA and 20 mA in proportion to (the absolute value of) the flow rate.

•Under conditions of forward flow, if (the absolute value of) the flow rate equals or exceeds 100 g/sec, the mA Output is proportional to the flow rate up to 20.5 mA, and will be level at 20.5 mA at higher flow rates.

•Under conditions of reverse flow, for flow rates between 0 and −100 g/sec, the mA Output varies between 4 mA and 12 mA in inverse proportion to the absolute value of the flow rate.

•Under conditions of reverse flow, if the absolute value of the flow rate equals or exceeds 100 g/sec, the mA Output is inversely proportional to the flow rate down to 3.8 mA, and will be level at 3.8 mA at higher absolute values.

Example: Flow Direction = Reverse

Configuration:

•Flow Direction = Reverse

•Lower Range Value = 0 g/sec

•Upper Range Value = 100 g/sec

Result:

•Under conditions of zero flow, the mA Output is 4 mA.

•Under conditions of reverse flow, for flow rates between 0 and +100 g/sec, the mA Output level varies between 4 mA and 20 mA in proportion to the absolute value of the flow rate.

•Under conditions of reverse flow, if the absolute value of the flow rate equals or exceeds 100 g/sec, the mA Output will be proportional to the absolute value of the flow rate up to 20.5 mA, and will be level at 20.5 mA at higher absolute values.

Configure process measurement

Effect of flow direction on Frequency Outputs

Flow direction affects how the transmitter reports flow values via the Frequency Outputs. The Frequency Outputs are affected by flow direction only if Frequency Output Process Variable is set to a flow variable.

Table 4-1: Effect of the flow direction parameter and actual flow direction on

Frequency Outputs

Effect of flow direction on Discrete Outputs

The flow direction parameter affects the Discrete Output behavior only if Discrete Output Source is set to Flow Direction.

Table 4-2: Effect of the flow direction parameter and actual flow direction on

Discrete Outputs

Effect of flow direction on digital communications

Flow direction affects how flow values are reported via digital communications. The following table describes the effect of the flow direction parameter and actual flow direction on flow values reported via digital communications.

Configure process measurement

Table 4-3: Effect of the flow direction on flow values

(1) Refer to the digital communications status bits for an indication of whether flow is positive or negative.

Effect of flow direction on flow totals

Flow direction affects how flow totals and inventories are calculated.

4.5Configure density measurement

The density measurement parameters control how density is measured and reported.

4.5.1Configure Density Measurement Unit

Overview

Density Measurement Unit controls the measurement units that will be used in density calculations and reporting.

Configure process measurement

Procedure

Set Density Measurement Unit to the option you want to use.

The default setting for Density Measurement Unit is g/cm3 (grams per cubic centimeter).

Options for Density Measurement Unit

The transmitter provides a standard set of measurement units for Density Measurement Unit. Different communications tools may use different labels.

(1) Non standard calculation. This value represents line density divided by the density of water at 60 °F.

4.5.2Configure two-phase flow parameters

Overview

The two-phase flow parameters control how the transmitter detects and reports twophase flow (gas in a liquid process or liquid in a gas process).

Note

Two-phase flow is also referred to as slug flow.

Configure process measurement

Procedure

1.Set Two-Phase Flow Low Limit to the lowest density value that is considered normal in your process.

Values below this will cause the transmitter to post Alert A105 (Two-Phase Flow).

Tip

Gas entrainment can cause your process density to drop temporarily. To reduce the occurrence of two-phase flow alerts that are not significant to your process, set Two-Phase Flow Low Limit slightly below your expected lowest process density.

You must enter Two-Phase Flow Low Limit in g/cm³, even if you configured another unit for density measurement.

The default value for Two-Phase Flow Low Limit is 0.0 g/cm³. The range is 0.0 to

10.0g/cm³.

2.Set Two-Phase Flow High Limit to the highest density value that is considered normal in your process.

Micro Motion recommends leaving Two-Phase Flow High Limit at the default value. Values above this will cause the transmitter to post Alert A105 (Two-Phase Flow).

You must enter Two-Phase Flow High Limit in g/cm³, even if you configured another unit for density measurement.

The default value for Two-Phase Flow High Limit is 5.0 g/cm³. The range is 0.0 to

10.0g/cm³.

3.Set Two-Phase Flow Timeout to the number of seconds that the transmitter will wait for a two-phase flow condition to clear before posting the alert.

The default value for Two-Phase Flow Timeout is 0.0 seconds, meaning that the alert will be posted immediately. The range is 0.0 to 60.0 seconds.

Detecting and reporting two-phase flow

Two-phase flow (gas in a liquid process or liquid in a gas process) can cause a variety of process control issues. By configuring the two-phase flow parameters appropriately for your application, you can detect process conditions that require correction.

Micro Motion recommends leaving Two-Phase Flow High Limit at the default value.

A two-phase flow condition occurs whenever the measured density goes below Two-Phase Flow Low Limit or above Two-Phase Flow High Limit. If this occurs:

•A two-phase flow alert is posted to the active alert log.

•All outputs that are configured to represent flow rate hold their last pre alert value for the number of seconds configured in Two-Phase Flow Timeout.

If the two-phase flow condition clears before Two-Phase Flow Timeout expires:

•Outputs that represent flow rate revert to reporting actual flow.

Configure process measurement

•The two-phase flow alert is deactivated, but remains in the active alert log until it is acknowledged.

If the two-phase flow condition does not clear before Two-Phase Flow Timeout expires, the outputs that represent flow rate report a flow rate of 0.

If Two-Phase Flow Timeout is set to 0.0 seconds, the outputs that represent flow rate will report a flow rate of 0 as soon as two-phase flow is detected.

4.5.3Configure Density Damping

Overview

Density Damping controls the amount of damping that will be applied to the line density value.

Damping is used to smooth out small, rapid fluctuations in process measurement. Damping Value specifies the time period (in seconds) over which the transmitter will spread changes in the process variable. At the end of the interval, the internal value will reflect 63% of the change in the actual measured value.

Tip

Density damping affects all process variables that are calculated from line density.

Procedure

Set Density Damping to the value you want to use.

The default value is 1.6 seconds. The range depends on the core processor type and the setting of Update Rate, as shown in the following table:

Tips

•A high damping value makes the process variable appear smoother because the reported value changes slowly.

•A low damping value makes the process variable appear more erratic because the reported value changes more quickly.