67
Reference Manual
00809-0100-4108, Rev CA
Troubleshooting
March 2017
Troubleshooting
Table 6-2. Rosemount 2088 troubleshooting for 1–5 Vdc output
Symptom Corrective actions
Transmitter voltage reading is
zero
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
Transmitter not
communicating with Field
Communicator
Verify terminal voltage is 5.8 to 28.0 Vdc
Check loop resistance, 250 Ù 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
Transmitter voltage reading is
low or high
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
Transmitter will not respond
to changes in applied
pressure
Check impulse piping or manifold for blockage
Verify applied pressure is between the 1–5 Vdc points
Verify the output is not in alarm condition
Verify transmitter is not in loop test mode
Verify transmitter is not in multidrop mode
Check test equipment
Digital pressure variable
reading is low or high
Check impulse piping for blockage or low fill in wet leg
Verify transmitter is calibrated properly
Check test equipment (verify accuracy)
Verify pressure calculations for application
Digital pressure variable
reading is erratic
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
Voltage reading is erratic 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
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