Emerson Rosemount 2151N Reference Manual page 72

Rosemount 2151N
POTENTIAL
SYMPTOM
SOURCE
Test Diode
Failures
Transmitter
Electronics Failure
Low Output
or No Output
Sensor Module
Power Supply
Impulse Piping
and Process
Connections
Transmitter
Erratic
Electronics
Output
Transmitter
Electronic Failure
Power Supply
63
CORRECTIVE ACTION
Replace terminal block.
Determine faulty circuit board by trying spare electronics
assembly or terminal block assembly. Replace faulty assembly.
NOTE: See Sensor Module Checkout section. The sensing
element is not field repairable and must be replaced if found to
be defective. See Disassembly Procedure for instructions on
disassembly. Check for obvious defects (i.e. punctured isolating
diaphragm, etc.) and contact Rosemount Nuclear.
Check the power supply output voltage at the transmitter.
Check for entrapped gas in liquid lines, or liquid in dry lines.
• Check for intermittent shorts or open circuits.
• Make sure the pins on the jumper, the pins on the filters, and
the pins on the sensor module are clean
Determine faulty circuit board by trying spare electronics
assembly or terminal block assembly. Replace faulty assembly.
Check power supply output voltage.
Reference Manual
00809-0000-4851 Rev AD
December 2023
Maintenance & Troubleshooting