Troubleshooting

Table 11-5Process variables problems and possible remedies continued

Symptom

Cause

Possible remedy

 

 

 

Inaccurate flow rate or fill total

Bad flow calibration factor

Verify characterization. See

 

 

Section 4.2.

 

 

 

 

Inappropriate measurement unit

Check configuration. See

 

 

Section 11.19.

 

 

 

 

Bad sensor zero

Rezero the flowmeter. See Section 3.5.

 

 

 

 

Bad density calibration factors

Verify characterization. See

 

 

Section 4.2.

 

 

 

 

Bad flowmeter grounding

See Section 11.14.3.

 

 

 

 

Slug flow

See Section 11.17.

 

 

 

 

Problem with receiving device

See Section 11.16.

 

 

 

 

Wiring problem

Verify all sensor-to-transmitter wiring

 

 

and ensure the wires are making good

 

 

contact.

 

 

 

Inaccurate density reading

Problem with process fluid

Use standard procedures to check

 

 

quality of process fluid.

 

 

 

 

Bad density calibration factors

Verify characterization. See

 

 

Section 4.2.

 

 

 

 

Wiring problem

Verify all sensor-to-transmitter wiring

 

 

and ensure the wires are making good

 

 

contact.

 

 

 

 

Bad flowmeter grounding

See Section 11.14.3.

 

 

 

 

Slug flow

See Section 11.17.

 

 

 

 

Sensor cross-talk

Check environment for sensor with

 

 

similar (±0.5 Hz) tube frequency.

 

 

 

 

Plugged flow tube

Check drive gain and tube frequency.

 

 

Purge the flow tubes.

 

 

 

Temperature reading significantly

RTD failure

Check for alarm conditions and follow

different from process temperature

 

troubleshooting procedure for indicated

 

 

alarm.

 

 

Disable external temperature

 

 

compensation. See Figure C-1.

 

 

 

Temperature reading slightly different

Temperature calibration required

Perform temperature calibration. See

from process temperature

 

Section 10.6.

 

 

 

Unusually high density reading

Plugged flow tube

Check drive gain and tube frequency.

 

 

Purge the flow tubes.

 

 

 

 

Incorrect K2 value

Verify characterization. See

 

 

Section 4.2.

 

 

 

Unusually low density reading

Slug flow

See Section 11.17.

 

 

 

 

Incorrect K2 value

Verify characterization. See

 

 

Section 4.2.

 

 

 

Unusually high tube frequency

Sensor erosion

Contact Micro Motion. See Section 1.8.

 

 

 

Unusually low tube frequency

Plugged flow tube

Purge the flow tubes.

 

 

 

Unusually low pickoff voltages

Several possible causes

See Section 11.23.5.

 

 

 

Unusually high drive gain

Several possible causes

See Section 11.23.3.

 

 

 

100

Micro Motion® Model 1500 Transmitters with the Filling and Dosing Application

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Emerson Process Management 1500 manual 100

1500 specifications

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