ABB STT04 Instruction Manual page 227

Table N-1. Problem Codes of TB82 Transmitter
Code Description
LO.GL.AD pH measuring electrode
impedance below
transmitter A/D range
LO.GLS.Z Low pH measuring
electrode impedance
LO.LOOP Current loop below lower
range value
(-0.2 mA hysteresis)
LO.PV PV below transmitter range
LO.R.CKT Reference impedance cir-
cuit failure - low range error
LO.RZ.AD Reference impedance
below transmitter A/D range
Corrective Action
Input PCB assembly glass pH impedance circuit failure exists.
Disable diagnostics and order replacement input PCB assembly.
Existing input PCB assembly should properly function until new
assembly is received.
Verify sensor wiring connections.
Verify glass electrode is intact. If broken, replace sensor.
Remove any liquids, oils, scales or corrosion from transmitter ter-
minal block or extension cable junction box terminals.
Verify sensor responds to pH buffers. Replace sensor if it does
not respond.
Change configuration to proper analyzer type if sensor is not a
glass pH sensor.
Verify process conditions are within configured output range. If
PV is outside configured range, increase output range.
Verify sensor wiring connections.
Remove any liquids, oils, scales or corrosion from transmitter ter-
minal block or extension cable junction box terminals.
Clean sensor and perform a buffer and process calibration.
Conduct a temperature calibration. If not using temperature sen-
sor, verify configuration for TMP.SNS is NONE.
Electronically test the sensor and temperature compensator
(refer to the product instruction). Replace sensor if it does not
meet requirements.
Verify process conditions are within transmitter range. PV must
be within transmitter range.
Verify sensor wiring connections.
Verify sensor does not have any exposed wire from nicks, etc. If
it does, repair (if possible) or replace.
Remove any liquids, oils, scales or corrosion from transmitter ter-
minal block or extension cable junction box terminals.
Verify sensor responds to pH buffers. Replace sensor and/or
sensor extension cable (if present) if sensor does not respond.
Electronically test sensor (refer to the product instruction).
Replace if it does not meet requirements.
Verify sensor wiring connections.
Electronically test sensor. Replace if it does not meet require-
ments.
Input PCB reference impedance circuit failure exists. Disable
diagnostics and order replacement input PCB assembly. Existing
input PCB assembly should properly function until new assembly
is received.
Input PCB reference impedance circuit failure exists. Disable
diagnostics and order replacement input PCB assembly. Existing
input PCB assembly should properly function until new assembly
is received.
PROBLEM AND ERROR CODES (TB82)
TB82 TRANSMITTER
(continued)
N - 21