Emerson Process Management 1500 manual Troubleshooting, Symptom, Cause, Possible remedy

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