
148
Micro Motion
®
Model 2400S Transmitters with Analog Outputs
Troubleshooting
If an output saturation alarm occurs:
•
Check the process.
•
Bring the flow rate within the sensor limit.
•
Check the sensor:
-
Ensure that flow tubes are full.
-
Purge flow tubes.
•
For the mA output, verify or change the mA URV and LRV (see Section 6.5.2).
•
For the frequency output, verify or change the scaling (see Section 6.6).
11.20
Checking the HART address and Loop Current Mode parameter
If the transmitter’s HART address is set to a non-zero number, the mA output may be fixed at 4 mA.
In this situation:
•
The mA output will not report process variable data.
•
The mA output will not indicate fault conditions.
To resolve this problem, try the following:
•
Set the HART address to zero. See Section 8.11.1
•
Enable the Loop Current Mode parameter. See Section 8.11.1.
11.21
Checking the flow measurement configuration
Using an incorrect flow measurement unit can cause the transmitter to produce unexpected output
levels, with unpredictable effects on the process. Make sure that the configured flow measurement
unit is correct. Check the abbreviations; for example,
g/min
represents grams per minute, not gallons
If the LRV or URV is set incorrectly, flow will be reported accurately but interpreted incorrectly by
the receiving device. Ensure that the LRV and URV are set correctly for your process and your
receiving device. See Section 6.4.
11.22
Checking the characterization
A transmitter that is incorrectly characterized for its sensor might produce inaccurate output values.
Both the K1 and FlowCal (FCF) values must be appropriate for the sensor. If these values are
incorrect, the sensor may not drive correctly or may send inaccurate process data.
If you discover that any of the characterization data are wrong, perform a complete characterization.
See Section 6.2.
11.23
Checking the calibration
Improper calibration can cause the transmitter to send unexpected output values. If the transmitter
appears to be operating correctly but sends inaccurate output values, an improper calibration may be
the cause.
Micro Motion calibrates every transmitter at the factory. Therefore, you should suspect improper
calibration only if the transmitter has been calibrated after it was shipped from the factory. Before
performing a calibration, consider meter validation or meter verification and select the appropriate
procedure (see Section 10.2). Contact Micro Motion customer service for assistance.
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