Emerson 3051S Specifikace stáhnout pdf (Strana 127)

Reference Manual

00809-0100-4803, Rev DA

Section 5: Troubleshooting

April 2013

Troubleshooting

5.5 Measurement troubleshooting

The transmitter provides a means to display the current process variables and flow calculations.

If the process variable reading is unexpected, this section provides the symptoms and possible

corrective actions.

Table 5-4. Unexpected Process Variable (PV) readings

Symptom Corrective Action

High PV Reading Primary Element

• Check for restrictions at the primary element.

• Check the installation and condition of the primary element.

• Note any changes in process fluid properties that may affect output.

Impulse piping

• Check to ensure that the pressure connection is correct.

• Check for leaks or blockage.

• Check to ensure that blocking valves are fully open.

• Check for entrapped gas in liquid lines or for liquid in gas lines.

• Check to ensure that the density of fluid in impulse lines is unchanged.

• Check for sediment in the transmitter process flange.

• Make sure that process fluid has not frozen within the process flange.

Power SupplyUPPLY

• Check the output voltage of the power supply at the transmitter. It should be 12 to 42.4 V dc for HART with

no load at the transmitter terminals.

Note

Do not use higher than the specified voltage to check the loop, or damage to the

transmitter may result.

Feature boared electronics

• Connect a personal computer and use AMS, Engineering Assistant Software, or the 375 to check the sensor

limits to ensure calibration adjustments are within the sensor range and that calibration is correct for the

pressure being applied.

• Confirm that the electronics housing is properly sealed against moisture.

• If the feature board electronics are still not functioning properly, substitute new feature board electronics.

Flow configuration (fully compesated mass and energy flow feature boared only)

• Verify flow configuration is correct for current application

Process Temperature RTD input

• Verify all wire terminations

• Verify sensor is a Pt 100 RTD

• Replace Pt 100 sensor

Sensor module

• The sensor module is not field repairable and must be replaced if found to be defective. Check for obvious

defects, such as a punctured isolating diaphragm or fill fluid loss, and contact your nearest Emerson Process

Management Service Center.

Erratic PV Reading Primary element

• Check the installation and condition of the primary element.

Loop wiring

• Check for adequate voltage to the transmitter. It should be 12 to 42.4 V dc for HART with no load at the

transmitter terminals.

• Check for intermittent shorts, open circuits, and multiple grounds.

Preocess pulsation

• Adjust the damping.

Feature board electronics

• Connect a personal computer and use AMS, Engineering Assistant Software, or the 375 to check the sensor

limits to ensure calibration adjustments are within the sensor range and that calibration is correct for the

pressure being applied.

• Confirm that the electronics housing is properly sealed against moisture.

• If the feature board electronics are still not functioning properly, substitute new feature board electronics.

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