Emerson Rosemount 2051 Reference Manual page 98

Troubleshooting
September 2020
Table 6-1: Rosemount troubleshooting table for 4–20 mA output
Symptom
Digital pressure variable reading is erratic
Milliamps reading is erratic
Table 6-2: Rosemount troubleshooting for 1–5 Vdc output
Symptom
Transmitter voltage reading is zero
Transmitter not communicating with Field
Communicator
Transmitter voltage reading is low or high
Transmitter will not respond to changes in
applied pressure
98
(continued)
Corrective actions
Check application for faulty equipment in
pressure line
Verify transmitter is not reacting directly to
equipment turning on/off
Verify damping is set properly for application
Verify power source to transmitter has adequate
voltage and current
Check for external electrical interference
Verify transmitter is properly grounded
Verify shield for twisted pair is only grounded at
one end
Corrective actions
Verify terminal voltage is 5.8 to 28.0 Vdc at
signal terminals
Check power wires for reversed polarity
Check that power wires are connected to signal
terminals
Check for open diode across test terminal
Verify terminal voltage is 5.8 to 28.0 Vdc
Check loop resistance, 250 Ω minimum (PS
voltage -transmitter voltage/loop current)
Check that power wires are connected to signal
terminals and not test terminals
Verify clean DC Power to transmitter (Max AC
noise 0.2 volts peak to peak)
Verify the output is between 1–5 Vdc or
saturation levels
Have Field Communicator poll for all addresses
Verify applied pressure
Verify 1–5 Vdc range points
Verify output is not in alarm condition
Perform analog trim
Check that power wires are connected to the
correct signal terminals (positive to positive,
negative to negative) and not the test terminal
Check impulse piping or manifold for blockage
Rosemount 2051 Pressure Transmitter
Reference Manual
00809-0100-4107