Troubleshooting Guide (Orp) - Emerson Rosemount 1054B Instruction Manual

MODEL 1054B pH/ORP
SYMPTOM
Change in ORP reading (value
shrinking)
ORP value locks up (no charge
in reading)
1054B ORP value not the same
as grab sample of process
Fault code tcH/tcL
Fault code i n H or i n L
Fault code Std
Fault code SEn
Fault code EEP
Fault code CHS
No alarm relay closure
No output current
Low output current
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TABLE 8-4. Troubleshooting Guide 1054B ORP
PROBLEM
1. Old or coated glass electrode
1. Coated electrode
1. Grab sample incorrect
2. Unclear what is correct
3. 1054B out of calibration
1. Miswire
2. Open or shorted RTD
1. Open wire from preamplifier
2. Bad preamplifier
3. Defective CPU
1. Ground loop offset (in process)
2. Voltage on the 1000 ft after
preamp process
1. Open wire between sensor
and 1054B
2. Maximum Cable length has
been exceeded
1. Defective EEPROM
1. Defective CPU
1. Defective power card
2. Defective CPU
1. Defective output board
2. Miswire
1. Circuit loading with excessive
resistance on output
START-UP AND CALIBRATION
ACTION
1. Clean or replace glass electrode
1. Replace electrode
2. Clean electrode
1. Re-evaluate sample technique
and equipment
2. Test with Quinhydrone or known
solution
3. Recalibrate per start-up and
calibration section
1. Check wiring between the sensor
and 1054B
2. Replace RTD with new one
1. Check wiring between amplifier
and 1054B
2. Replace preamplifier
3. Replace CPU PCB
1. Check all input wiring
2. Recheck buffer accuracy
1. Repair wire
2. Check wiring
1. Replace CPU PCB
1. Replace CPU PCB
1. Replace power PCB
2. Replace CPU PCB
1. Replace power PCB
2. Check for short
1. Consult output loading limits
1054B specs (600 ohms max)
SECTION 5.0
41