ABB STT04 Instruction Manual page 224

TB82 TRANSMITTER
Table N-1. Problem Codes of TB82 Transmitter
Code Description
HI.G.CKT pH measuring electrode
impedance circuit failure -
high range error
HI.GL.DA pH measuring electrode
impedance above
transmitter A/D range
HI.LOOP Current loop above upper
range value
(+0.4 mA hysteresis)
+HI.OFF Large positive sensor offset
(>180 mV)
-HI.OFF Large negative sensor
offset (<-180 mV)
PROBLEM AND ERROR CODES (TB82)
N - 18
Corrective Action
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. Replace if it does not meet require-
ments.
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.
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 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.
Clean sensor and perform buffer and process calibration.
Inspect sensor and cabling for shorts. Remove all potential
shorts to ground, conduit or metals.
If sensor is functioning properly, order spare sensor to replace
existing sensor. Replace existing sensor with spare when trans-
mitter does not accept calibration values.
Clean sensor and perform buffer and process calibration.
Inspect sensor and cabling for shorts. Remove all potential
shorts to ground, conduit or metals.
If sensor is functioning properly, order spare sensor to replace
existing sensor. Replace existing sensor with spare when trans-
mitter does not accept calibration values.
(continued)