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206 Micro Motion
®
Series 3000 MVD Transmitters and Controllers
Diagnostics and Troubleshooting
22.3 Meter fingerprinting
Note: Meter fingerprinting is available only on systems with the standard core processor.
The meter fingerprinting feature provides snapshots, or “fingerprints,” of twelve process variables, at
four different points of transmitter operation. See Table 22-2.
For each process variable, the following values are recorded:
•For Mech Zero:
- 5-minute running average
- 5-minute running standard deviation
• For all other process variables:
- Instantaneous value
- 5-minute running average
- 5-minute running standard deviation
- Recorded minimum
- Recorded maximum
To access meter fingerprint data, use the Maintenance menu as shown in Figure 22-1. The transmitter
will report the data in either SI units or English units, as configured from the Units menu item. The
display is updated continuously.
Unusually low density reading Slug flow See Section 22.7.3.
Incorrect K2 value Verify characterization. See
Section 22.16.
Sensor erosion Contact Micro Motion.
Unusually high tube frequency Sensor erosion Contact Micro Motion.
Reversed drive coil leads (remote core
processor with remote transmitter
installations)
Verify drive coil leads
Unusually low tube frequency Plugged, partially filled, or coated flow
tube
Check drive gain and tube frequency.
See Section 22.18.
Purge the flow tubes.
Unusually low pickoff voltages Several possible causes See Section 22.18.5
.
Unusually high drive gain Several possible causes See Section 22.18.3.
Table 22-2 Meter fingerprinting data
Fingerprint time Description Process variables recorded
Current Present-time values • Mass flow rate
• Volume flow rate
• Density
•Temperature
• Case temperature
•Mech zero
• Tube frequency
•Drive gain
• Left pickoff
• Right pickoff
• Core processor temperature
• Core processor input voltage
Factory Values at time transmitter left factory
Installation Values at time of first sensor zero
Last zero Values at time of most recent sensor
zero
Table 22-1 Process variables problems and possible remedies continued
Symptom Cause Possible remedy