Table of Contents
MODEL 5081-A
16.2 TROUBLESHOOTING WHEN A FAULT OR WARNING MESSAGE IS SHOWING
Message
Explanation
OuEr rAnGE
Over range, measurement exceeds display limit
AMP FAIL
Amperometric sensor failure, sensor current is too high
bAd SEnSor
Bad sensor, sensor current is a large negative number
0 too biG
Zero current is too large, sensor was zeroed while current exceeded 100 nA
CAL Error
Calibration error, sensitivity (nA/ppm) is too high or too low
nEEd 0 CAL
Sensor needs re-zeroing, reading is too negative
bAd rtd
Bad temperature reading
TEMP HI
Temperature reading exceeds 150°C
TEMP LO
Temperature reading is less than -15°C
rtd OPEn
RTD or thermistor is open
SenSE OPEn
Sense line is not connected
PH in
Raw millivolt reading from pH sensor is too large
SLOPE HI
pH sensor slope exceeds 62 mV/pH
SLOPE LO
pH sensor slope is less than 40 mV/pH
-0- OFFSEt
Zero offset during standardization exceeds programmed limit
GLASS FAIL
Measured glass impedance is less than programmed limit
FACt FAIL
Unit has not been factory-calibrated
CPU FAIL
Internal CPU tests have failed
ROM FAIL
Internal memory has failed
AdC
Analog to digital conversion failed
bAd Gnd
Bad ground
In too biG
mV signal from pH sensor is too large
RitE Err
CPU PCB jumper (JP-1) has been removed
16.2.1 OuEr rAnGE and AMP FAIL.
These error messages appear if the sensor current is too high. Normally, excessive sensor current implies that the amper-
ometric sensor is miswired or the sensor has failed.
1. Verify that wiring is correct and connections are tight. Be sure to check connections at the junction box if one is being
used. See Section 3.0.
2. Replace the sensor membrane and electrolyte solution and clean the cathode if necessary. See the sensor instruction
sheet for details.
3. Replace the sensor.
SECTION 16.0
TROUBLESHOOTING
See Section
16.2.1
16.2.1
16.2.2
16.2.3
16.2.4
16.2.5
16.2.6
16.2.6
16.2.6
16.2.6
16.2.7
16.2.8
16.2.9
16.2.9
16.2.10
16.2.11
16.2.12
16.2.13
16.2.13
16.2.14
16.2.15
16.2.16
16.2.17
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Troubleshooting
