Emerson 2200S 사용자 설명서

112

Inaccurate density reading

Problem with process fluid

• Use standard procedures to check 

quality of process fluid.

Bad density calibration factors

• Verify characterization. See 

Wiring problem

• Check the sensor circuitry. See 

Bad flowmeter grounding

• See Section 10.14.2.

Slug flow

• See Section 10.17.

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.

Incorrect sensor orientation

• Sensor orientation must be 

appropriate to process fluid. See the 
installation manual for your sensor.

RTD failure

• Check for alarm conditions and follow 

troubleshooting procedure for 
indicated alarm.

Physical characteristics of sensor have 
changed

• Check for corrosion, erosion, or tube 

damage.

Temperature reading significantly 
different from process temperature

RTD failure

• Check for alarm conditions and follow 

troubleshooting procedure for 
indicated alarm.

Temperature reading slightly different 
from process temperature

Sensor leaking heat

• Insulate the sensor.

Unusually high density reading

Plugged flow tube

• Check drive gain and tube frequency. 

Purge the flow tubes.

Incorrect K2 value

• Verify characterization. See 

Unusually low density reading

Slug flow

• See Section 10.17.

Incorrect K2 value

• Verify characterization. See 

Unusually high tube frequency

Sensor erosion

• Contact Micro Motion.

Unusually low tube frequency

Plugged flow tube, corrosion, or erosion

• Purge the flow tubes.

Unusually low pickoff voltages

Several possible causes

• See Section 10.23.3

.

Unusually high drive gain

Several possible causes

• See Section 10.23.2.

Process variables problems and remedies continued