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24 Micro Motion
®
Model 1500 Transmitters with the Filling and Dosing Application
Required Transmitter Configuration
4.5.1 Configuring the primary variable
The primary variable is the process variable to be reported through the mA output. Table 4-7 lists the
process variables that can be assigned to the mA outputs.
Note: The process variable assigned to the mA output is always the PV (primary variable).
4.5.2 Configuring the mA output range (LRV and URV)
The mA output uses a range of 4 to 20 mA to represent the assigned process variable. You must
specify:
• The lower range value (LRV) – the value of the process variable that will be indicated when
the mA output produces 4 mA
• The upper range value (URV) – the value of the process variable that will be indicated when
the mA output produces 20 mA
Enter values in the measurement units that are configured for the assigned process variable (see
Section 4.4).
Note: The URV can be set below the LRV; for example, the URV can be set to 0 and the LRV can be
set to 100.
4.5.3 Configuring the AO cutoff
The AO (analog output) cutoff specifies the lowest mass flow or volume flow value that will be
reported through the mA output. Any mass flow or volume flow values below the AO cutoff will be
reported as zero.
Note: For most applications, the default AO cutoff is used. Contact Micro Motion customer support
before changing the AO cutoff.
Multiple cutoffs
Cutoffs can also be configured for the mass flow and volume flow process variables (see Section 6.5).
If mass flow or volume flow has been assigned to the mA output, a non-zero value is configured for
the flow cutoff, and the AO cutoff is also configured, the cutoff occurs at the highest setting, as shown
in the following example.
Table 4-7 mA output process variable assignments
Process variable ProLink II label
Mass flow Mass Flow Rate
Volume flow Volume Flow Rate
Example
Configuration:
• mA output: Mass flow
• AO cutoff: 10 g/sec
• Mass flow cutoff: 15 g/sec
As a result, if the mass flow rate drops below 15 g/sec, the mA output
will report zero flow.