Micro Motion® Fork Density Meters (FDM) with
Foundation™ Fieldbus
Configuration and Use Manual
Safety and approval information
This Micro Motion product complies with all applicable European directives when properly installed in accordance with the
instructions in this manual. Refer to the EC declaration of conformity for directives that apply to this product. The EC declaration of
conformity, with all applicable European directives, and the complete ATEX Installation Drawings and Instructions are available on
the internet at www.micromotion.com or through your local Micro Motion support center.
Information affixed to equipment that complies with the Pressure Equipment Directive can be found on the internet at
www.micromotion.com/documentation.
For hazardous installations in Europe, refer to standard EN 60079-14 if national standards do not apply.
Emerson Flow customer service
Email:
•Worldwide: flow.support@emerson.com
•Asia-Pacific: APflow.support@emerson.com
Telephone:
North and South AmericaEurope and Middle EastAsia Pacific
United States800-522-6277U.K.0870 240 1978Australia800 158 727
D.2Transducer blocks and views ................................................................................................... 144
D.2.1Measurement transducer block and related information .......................................... 145
D.2.2Calibration transducer block and related information ............................................... 150
D.2.3Diagnostic transducer block and related information ................................................154
D.2.4Device Information transducer block and related information .................................. 164
D.2.5Local Display transducer block and related information ............................................ 169
D.2.6API Referral transducer block and related information .............................................. 176
Configuration and Use Manual iii
Contents
D.2.7Concentration Measurement transducer block and related information ................... 182
D.2.8Density Viscosity Meter transducer block and related information ............................192
Appendix EConcentration measurement matrices, derived variables, and process variables ........ 211
E.1Standard matrices for the concentration measurement application ........................................ 211
E.2Concentration measurement matrices available by order ........................................................212
E.3Derived variables and calculated process variables .................................................................. 214
ivMicro Motion® Fork Density Meters (FDM) with Foundation™ Fieldbus
Part I
Getting Started
Chapters covered in this part:
•Before you begin
•Quick start
Getting Started
Configuration and Use Manual 1
Getting Started
2Micro Motion® Fork Density Meters (FDM) with Foundation™ Fieldbus
1Before you begin
Topics covered in this chapter:
•About this manual
•Model codes and device types
•Communications tools and protocols
•Additional documentation and resources
1.1About this manual
This manual provides information to help you configure, commission, use, maintain, and
troubleshoot the Micro Motion Fork Density Meter (FDM).
The following version of the FDM is documented in this manual: Fork Density Meter with
Foundation Fieldbus.
Before you begin
See Micro Motion® Fork Density Meters: Configuration and Use Manual for the following
versions of the FDM:
•Fork Density Meter with Analog Outputs
•Fork Density Meter with Analog Output and Discrete Output
•Fork Density Meter with Time Period Signal Output
Important
This manual assumes that your meter has been installed correctly and completely, according to the
instructions in the installation manual, and that the installation complies with all applicable safety
requirements.
1.2Model codes and device types
Your device can be identified by the model code on the device tag.
Model codes and device typesTable 1-1:
Model codeDevice nicknameI/O
FDM*****CFDM mA• Two mA outputs
• RS-485 terminals
FDM*****DFDM DO• One mA output
• One discrete output
• RS-485 terminals
Electronics mounting
Integral
Integral
Configuration and Use Manual 3
Before you begin
Model codes and device types (continued)Table 1-1:
Model codeDevice nicknameI/O
FDM*****BFDM TPS• One mA output
• One Time Period Sig-
nal output
FDM*****AFDM FF• Foundation fieldbus4-wire remote
Restriction
The FDM and FDM FF meters support a complete set of application and configuration options. The
FDM DO and FDM TPS meters support a subset of configuration options. Refer to the product data
sheet for details.
1.3Communications tools and protocols
Electronics mounting
Integral
transmitter
You can use several different communications tools and protocols to interface with the
device. You may use different tools in different locations or for different tasks.
Communications tools, protocols, and related informationTable 1-2:
Communications toolSupported protocolsScopeIn this manualFor more information
Resource block, transducer blocks and information about the function blocks related to
user tasks. See
Appendix D.
Not applicable
User manual
• Installed with soft-
ware
• On Micro Motion
user documentation
CD
• On Micro Motion
web site
(www.micromo‐
tion.com)
Foundation fieldbus
documentation
4Micro Motion® Fork Density Meters (FDM) with Foundation™ Fieldbus
Tip
You may be able to use other communications tools from Emerson Process Management, 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.micromotion.com.
1.4Additional documentation and resources
Micro Motion provides additional documentation to support the installation and operation
of the transmitter.
Additional documentation and resourcesTable 1-3:
TopicDocument
Device installationMicro Motion Fork Density Meters (FDM): Installation Manual
Micro Motion Model 1700 and Model 2700 Transmitters: Installation
Manual
Product data sheetMicro Motion Fork Density Meters: Product Data Sheet
Micro Motion Model 1700 and Model 2700 Transmitters: Product
Data Sheet
Before you begin
All documentation resources are available on the Micro Motion web site at
www.micromotion.com or on the Micro Motion user documentation DVD.
Configuration and Use Manual 5
Before you begin
6Micro Motion® Fork Density Meters (FDM) with Foundation™ Fieldbus
2Quick start
Topics covered in this chapter:
•Power up the transmitter
•Check meter status
•Make a startup connection to the transmitter
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.
CAUTION!
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.
Quick start
2.Turn on the electrical power at the power supply.
The transmitter will automatically perform diagnostic routines. During this period,
Alert 009 is active. The diagnostic routines should complete in approximately
30 seconds.
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.
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.
Configuration and Use Manual 7
Quick start
Transmitter status reported by status LEDTable 2-1:
LED stateDescriptionRecommendation
GreenNo alerts are active.Continue with configuration or process meas-
urement.
Flashing greenNo alerts are active. One or more previously
active alerts have not been acknowledged.
YellowOne or more low-severity alerts are active, and
have been acknowledged.
Flashing yellowOne or more low-severity alerts are active and
have not been acknowledged.
RedOne or more high-severity alerts are active,
and have been acknowledged.
Flashing redOne or more high-severity alerts are active and
have not been acknowledged.
Continue with configuration or process measurement. If you choose, you can acknowledge
the alerts.
A low-severity alert condition does not affect
measurement accuracy or output behavior.
You can continue with configuration or process measurement. If you choose, you can identify and resolve the alert condition.
A low-severity alert condition does not affect
measurement accuracy or output behavior.
You can continue with configuration or process measurement. If you choose, you can identify and resolve the alert condition. You may
also acknowledge the alert.
A high-severity alert condition affects measurement accuracy and output behavior. Resolve the alert condition before continuing.
A high-severity alert condition affects measurement accuracy and output behavior. Resolve the alert condition before continuing.
You may also acknowledge the alert.
Related information
View and acknowledge status alerts
Status alerts, causes, and recommendations
2.3Make a startup connection to the transmitter
Identify the connection type to use, and follow the instructions for that connection type in
the appropriate appendix.
8Micro Motion® Fork Density Meters (FDM) with Foundation™ Fieldbus
Configuration and commissioning
Part II
Configuration and commissioning
Chapters covered in this part:
•Introduction to configuration and commissioning
•Integrate the meter with the network
•Configure process measurement
•Configure device options and preferences
•Completing the configuration
Configuration and Use Manual 9
Configuration and commissioning
10Micro Motion® Fork Density Meters (FDM) with Foundation™ Fieldbus
Introduction to configuration and commissioning
3Introduction to configuration and
commissioning
Topics covered in this chapter:
•Default values
•Enable access to the off‐line menu of the display
•Place function blocks in Out of Service mode
•Restore the factory configuration
3.1Default values
Default values for your meter are configured at the factory. The specific values are
determined by the options that were specified on the purchase order. These are provided
on the configuration sheet that was shipped with your meter.
3.2Enable access to the off-line menu of the
display
Fieldbus hostLocal Display TB > Offline Menu (OD Index 011)
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.
Configuration and Use Manual 11
Introduction to configuration and commissioning
3.3Place function blocks in Out of Service mode
DisplayNot available
ProLink IIINot applicable
Fieldbus host(block name) > MODE_BLOCK (OD Index Number 005)
Overview
Before you modify parameters on the fieldbus function blocks, you must place the
function blocks in Out of Service (O/S) mode. Before you return the device to operation,
you must place them back in service (Auto mode). If you are using ProLink III to modify
parameters, ProLink III handles this automatically.
3.4Restore the factory configuration
DisplayNot available
ProLink IIIDevice Tools > Configuration Transfer > Restore Factory Configuration
Fieldbus hostDiagnostic TB > Restore Factory Config (OD Index 050)
Overview
Restoring the factory configuration returns the transmitter to a known operational
configuration. This may be useful if you experience problems during configuration.
Tip
Restoring the factory configuration is not a common action. You may want to contact Micro Motion
to see if there is a preferred method to resolve any issues.
12Micro Motion® Fork Density Meters (FDM) with Foundation™ Fieldbus
Integrate the meter with the network
4Integrate the meter with the network
Topics covered in this chapter:
•Assign function block channels to transducer block channels
•Configure AI Linearization
•Configure process alert limits for the AI blocks
•Configure the timeout for Field Diagnostic alerts
4.1Assign function block channels to transducer
block channels
Fieldbus hostAI or AO function block > CHANNEL
AI or AO function block > XD_SCALE (OD Index 10)
AI or AO function block > OUT_SCALE (OD Index 11)
Overview
Each of the four AI function blocks and the AO function block can be assigned to a
transducer block channel. Each transducer block channel is used for a single process
variable. The AI function blocks are used for input data (data sent from the transmitter to
the host). The AO function block is used for output data (data sent from the host to the
transmitter).
Channel assignment for the function blocksFigure 4-1:
A
A.AO function block or AI function block
B.AI channel or AO channel (CHANNEL)
C.Transducer scale: units index (XD_SCALE)
D.Output scale: units index (OUT_SCALE)
Note
Perform these steps for each AI function block channel (1–4) and the AO function block channel, as
needed.
B
C
D
Configuration and Use Manual 13
Integrate the meter with the network
Procedure
1.Set the (AI or AO) function block channel to the transducer block channel this block
should report.
2.Make sure the transducer scale is set to the correct units, and change it if necessary.
3.Make sure the output scale units matches the transducer scale units, and change it if
necessary.
4.2Configure AI Linearization
Fieldbus hostAI function block > L_TYPE (OD Index 16)
Overview
AI Linearization is used to rescale a process variable. It can also be used to change the
measurement units. The default setting (Direct) is appropriate for most applications.
Procedure
1.Set AI Linearization as desired.
OptionDescription
DirectThe AI block reports process variables directly from the Measurement trans-
ducer block.
IndirectThe value from the Measurement transducer block is rescaled as specified by
the Transducer Scale parameters and the Output Scale parameters. The AI
block reports the inverse of the result.
Indirect
Square Root
Important
AI linearization affects only the process variable reported by the AI block. It has no effect on
the Measurement block. Therefore:
• If you set AI Linearization to Indirect or Indirect Square Root, the process variable reported by the
AI block will be different from the process variable read directly from the Measurement
block. Both the display and ProLink III read data directly from the Measurement block.
• Measurement parameters such as Density Damping and Density Cutoff are processed by the
Measurement block, and the result is passed through AI linearization. Using Ai
linearization to implement damping or cutoff processing may not be possible, and is not
recommended.
The value from the Measurement transducer block is rescaled as specified by
the Transducer Scale parameters and the Output Scale parameters. The AI
block reports the square root of the result. This setting is not applicable to
most Micro Motion meters.
2.If you selected Indirect or Indirect Square Root, set the Transducer Scale and Output
Scale parameters:
14Micro Motion® Fork Density Meters (FDM) with Foundation™ Fieldbus
Integrate the meter with the network
a. Set Transducer Scale: EU at 0% to the value of the process variable when the
transducer block reports 0%.
b. Set Transducer Scale: EU at 100% to the value of the process variable when the
transducer block reports 100%.
c. Set Output Scale: EU at 0% to the value of the process variable when the AI block
reports 0%.
d. Set Output Scale: EU at 100% to the value of the process variable when the AI block
reports 100%.
Specify the two transducer scale parameters in the measurement unit configured
for the transducer block. Specify the two output scale parameters in the
measurement unit configured for the AI block. In most cases, the transducer block
and the AI block use the same measurement unit.
Example: Using scaling to change the measurement unit
The transducer block is configured to measure density in g/cm³. You want the AI block to
report density in oz/in³.
Your lowest expected density value is 0.5 g/cm³. This is equivalent to 0.289 oz/in³.
Your highest expected density value is 0.85 g/cm³. This is equivalent to 0.491 oz/in³.
Set parameters as follows:
•AI Linearization = Indirect
•Transducer Scale: EU at 0% = 0.5
•Transducer Scale: EU at 100% = 0.85
•Output Scale: EU at 0% = 0.289
•Output Scale: EU at 100% = 0.491
Result: As line density varies between 0.5 g/cm³ and 0.85 g/cm³:
•The transducer block varies between 0% and 100%.
•The Measurement block converts this value to a value between 0.5 g/cm³ and
0.85 g/cm³. The result is reported on the display and set to the AI block.
•The AI block applies AI linearization, and reports a value between 0.289 oz/in³ and
0.85 oz/in³.
Configuration and Use Manual 15
Integrate the meter with the network
4.3Configure process alert limits for the AI blocks
Fieldbus hostAI function block > HI_HI_LIM (OD Index 26)
AI function block > HI_HI_PRI (OD Index 25)
AI function block > HI_LIM (OD Index 28)
AI function block > HI_PRI (OD Index 27)
AI function block > LO_LIM (OD Index 30)
AI function block > LO_PRI (OD Index 29)
AI function block > LO_LO_LIM (OD Index 32)
AI function block > LO_LO_PRI (OD Index 31)
AI function block > ALARM_HYS (OD Index 24)
Overview
Process alerts are used to indicate that a process variable is outside the specified limits.
Each AI block has four alert limits: High-High, High, Low, and Low-Low. In general, the
range between High and Low represents the normal process range.
Process alerts are reported only by the affected AI block. They are not shown on the display
or reported by ProLink III.
Prerequisites
Before setting process alert limits, ensure that the four AI blocks are configured for the
appropriate transducer channel (process variable) and measurement unit.
Procedure
1.Select AI Block 1.
2.Set process alert limits:
a. Set the High-High alert to the value of the process variable that will cause the
transmitter to post a High-High alert for this AI block.
b. Set the High alert to the value of the process variable that will cause the
transmitter to post a High alert for this AI block.
c. Set the Low alert to the value of the process variable that will cause the
transmitter to post a Low alert for this AI block.
d. Set the Low-Low alert to the value of the process variable that will cause the
transmitter to post a Low-Low alert for this AI block.
3.For each process alert limit, set the alert priority.
The alert priority is a value between 0 and 15. Higher numbers represent higher
priorities. These values are used for fieldbus network management. They do not
affect transmitter operation: The transmitter will post the alert as soon as the
condition is detected.
4.Repeat for all other AI blocks.
5.Set the alert hysteresis.
16Micro Motion® Fork Density Meters (FDM) with Foundation™ Fieldbus
Integrate the meter with the network
The alert hysteresis defines a range around the alert limit that operates as a
deadband. The range is defined in terms of % of the output scale. Alert hysteresis is
used to suppress repetitive alerts when the process variable is hovering around the
alert limit.
• A higher value suppresses alerts across a wider range.
• A lower value suppresses alerts across a narrower range. Therefore, alerts may be
posted more frequently.
Important
The alert hysteresis applies to all AI blocks and to all process alert limits.
Example:
AI Block 1 is configured to report line density. The High alert is set at 1.0 g/cm³. The
alert hysteresis is set at 5%.
If line density goes above 1.05 g/cm³, the transmitter posts a High alert. The High
alert remains active until density goes below 0.95 g/cm³.
4.4Configure the timeout for Field Diagnostic
alerts
Fieldbus hostDiagnosticsTB > Alert Index (OD Index 017)
Diagnostic TB > Alert timeout (OD Index 083)
Overview
Each Field Diagnostic alert has an individual Timeout parameter. If the alert occurs, it is not
sent to the host until the timeout has expired. Additionally, any associated AI blocks do not
go into fault until the timeout has expired. In other words, the process quality for the AI
block is reported as Good until the timeout expires.
Procedure
1.Set the alert index to the alert you want to configure.
2.Set the timeout as desired:
• Default: 0 seconds
• Range: 0 to 300 seconds
Configuration and Use Manual 17
Integrate the meter with the network
18Micro Motion® Fork Density Meters (FDM) with Foundation™ Fieldbus
Configure process measurement
5Configure process measurement
Topics covered in this chapter:
•Verify the calibration factors
•Configure line density measurement
•Configure temperature measurement
•Configure the pressure input
•Set up the API referral application
•Set up concentration measurement
5.1Verify the calibration factors
DisplayNot available
ProLink IIIDevice Tools > Calibration Data
Fieldbus hostDensity Viscosity Meter TB > DEN_A1 (OD Index 035)
Density Viscosity Meter TB > DEN_A2 (OD Index 036)
Density Viscosity Meter TB > DEN_A3 (OD Index 037)
Density Viscosity Meter TB > DEN_A4 (OD Index 038)
Density Viscosity Meter TB > DEN_A5 (OD Index 039)
Density Viscosity Meter TB > DEN_A6 (OD Index 040)
Density Viscosity Meter TB > DEN_A7 (OD Index 041)
Density Viscosity Meter TB > DEN_A8 (OD Index 042)
Density Viscosity Meter TB > DEN_A9 (OD Index 043)
Overview
The calibration factors are used to adjust measurement for the unique traits of the sensor.
Your device was calibrated at the factory. However, you should verify that the calibration
factors that are configured in your device match the factory values.
Prerequisites
You will need the factory values for the calibration factors. These are provided in two
locations:
•The calibration certificate shipped with your meter
•The label inside the transmitter's end-cap
Important
If the transmitter is not the original component, do not use the values from the transmitter label.
Configuration and Use Manual 19
Configure process measurement
Procedure
1.View the calibration factors that are stored in the device.
2.Compare them to the factory values.
• If the values match, no action is required.
• If the values do not match, contact Micro Motion customer service.
Related information
Sample calibration certificate
5.1.1Calibration factors
The original calibration factors are obtained from factory calibration, and are unique to
each device. They are used to adjust measurements for the specific physical properties of
the device.
The calibration certificate contains two sets of factors:
Density calibration
coefficients
Temperature
compensation coefficients
The calibration certificate also provides the results of the Known Density Verification
procedure that was performed at the factory.
For each calibration performed at the factory, the calibration certificate contains the data
used to calculate the calibration coefficients.
Related information
Sample calibration certificate
Define the relationship between density and the response
of your sensor
Adjust density measurement for the effect of temperature
on sensor response
5.2Configure line density measurement
The density measurement parameters control how density is measured and reported.
•Configure Density Measurement Unit (Section 5.2.1)
20Micro Motion® Fork Density Meters (FDM) with Foundation™ Fieldbus
5.2.1Configure Density Measurement Unit
DisplayOFF-LINE MAINT > OFF-LINE CONFG > UNITS > DENS
ProLink IIIDevice Tools > Configuration > Process Measurement > Line Density > Density Unit
Fieldbus hostMeasurement TB > Density Unit (OD Index 017)
Overview
Density Measurement Unit controls the measurement units that will be used in density
calculations and reporting.
Restriction
If the API referral application is enabled, you cannot change the density measurement unit here. The
density measurement unit is controlled by the API table selection.
Note
"Display" refers to the display on the remotely mounted transmitter, not directly mounted to the
meter. If there is a display directly on the meter, it can only view process variables, and it cannot be
used for any other operation.
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).
Related information
Set up the API referral application
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.
Options for Density Measurement UnitTable 5-1:
LabelCode
Unit description
Specific gravity
Grams per cubic centimeterG/CM3g/cm31100
Grams per literG/Lg/l1105
Grams per milliliterG/mLg/ml1104
Kilograms per literKG/Lkg/l1103
Kilograms per cubic meterKG/M3kg/m31097
(1)
DisplayProLink IIIFieldbus host
SGUSGU1114
Configuration and Use Manual 21
Configure process measurement
Options for Density Measurement Unit (continued)Table 5-1:
LabelCode
Unit description
Pounds per U.S. gallonLB/GALlbs/Usgal1108
Pounds per cubic footLB/CUFlbs/ft31107
Pounds per cubic inchLB/CUIlbs/in31106
Short ton per cubic yardST/CUYsT/yd31109
Degrees APID APIdegAPI1113
Special unitSPECLspecial253
(1) Non‐standard calculation. This value represents line density divided by the density of water at 60 °F.
DisplayProLink IIIFieldbus host
Define a special measurement unit for density
DisplayNot available
ProLink IIIDevice Tools > Configuration > Process Measurement > Line Density > Special Units
Fieldbus hostDensity Viscosity Meter TB > Base Unit (OD Index 081)
Density Viscosity Meter TB > Conversion Factor (OD Index 083)
Density Viscosity Meter TB > Label (OD Index 080)
Procedure
1.Specify Density Special Unit Base.
Density Special Unit Base is the existing density unit that the special unit will be based
on.
2.Calculate Density Special Unit Conversion Factor as follows:
a. x base units = y special units
b. Density Special Unit Conversion Factor = x/y
3.Enter Density Special Unit Conversion Factor.
4.Set User-Defined Label to the name you want to use for the density 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 density
You want to measure density in ounces per cubic inch.
1.Set Density Special Unit Base to g/cm3.
2.Calculate Density Special Unit Conversion Factor: 1 g/cm3 = 0.578 oz/in3
22Micro Motion® Fork Density Meters (FDM) with Foundation™ Fieldbus
3.Set Density Special Unit Conversion Factor to 0.578.
4.Set User-Defined Label to oz/in3.
5.2.2Configure Density Damping
DisplayNot available
ProLink IIIDevice Tools > Configuration > Process Measurement > Line Density > Density Damping
Fieldbus hostMeasurement TB > Density_Damping (OD Index 028)
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. DampingValue 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.
Configure process measurement
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 0 seconds. The range is 0 to 60 seconds.
5.2.3Configure Density Cutoff
DisplayNot available
ProLink IIIDevice Tools > Configuration > Process Measurement > Line Density > Density Cutoff Low
Fieldbus hostMeasurement TB > Density_Low_Cutoff (OD Index 034))
Overview
Density Cutoff Low specifies the lowest density value that will be reported as measured. All
density values below this cutoff will be reported as 0.
Procedure
Set Density Cutoff Low to the value you want to use.
The default value is 0.2 g/cm³. The range is 0.0 g/cm³ to 0.5 g/cm³.
Configuration and Use Manual 23
Configure process measurement
5.2.4Configure two-phase flow parameters
DisplayNot available
ProLink IIIDevice Tools > Configuration > Process Measurement > Line Density
Fieldbus hostDiagnostic TB > Two-Phase Flow Low Limit (OD Index 009)
Diagnostic TB > Two-Phase Flow High Limit (OD Index 010)
Diagnostic TB > Two-Phase Flow Timeout (OD Index 008)
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 sometimes referred to as slug flow.
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 ().
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 FlowLow 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.
2.Set Two-Phase Flow High Limit to the highest density value that is considered normal in
your process.
Values above this will cause the transmitter to post Alert A105 (Two-Phase Flow).
Tip
To reduce the occurrence of two-phase flow alerts that are not significant to your process, set
Two-Phase Flow High Limit slightly above your expected highest process density.
You must enter Two-Phase Flow High Limit in g/cm³, even if you configured another
unit for density measurement.
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.
24Micro Motion® Fork Density Meters (FDM) with Foundation™ Fieldbus
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