8.1.4 Troubleshooting when a diagnostic message is showing
The 5081-P pH/ORP transmitter continuously monitors the measurement loop (sensor and
transmitter) for problems. If a problem is detected, the transmitter displays a fault or error
message. The message appears in the temperature/output area of the main display. The
table lists each diagnostic message and the section to consult for help.
Message Section
GLASSFAIL GLASSFAIL
GLASSWArn GLASSWArn
rEF FAIL rEF FAIL
rEF WArn rEF WARn
CALIbrAtE CALIbrAtE
tEMP HI tEMP HI and tEMP LO
tEMP LO tEMP HI and tEMP LO
LInE FAIL LinE FAIL
InPUt WArn InPUt WArn
SLOPE Err LO SLOPE Err LO
SLOPE Err HI SLOPE Err HI
Std Err Std Err
rOM FAIL rOM FAIL or CPU FAIL
CPU FAIL rOM FAIL or CPU FAIL
AdC WArn AdC WArn or CyCLE PWr
CyCLE PWr AdC WArn or CyCLE PWr
WrItE Err WritE Err
FACt FAIL FACt FAIL error message
GLASSFAIL
GLASSFAIL is an electrode fault message. It means the glass impedance is outside the
programmed Glass Fault High (GFH) or Glass Fault Low (GFL) limit. Glass Fault High
suggests the electrode is aging or the electrode is not immersed in the process liquid.
Glass Fault Low implies that the pH sensitive glass is cracked. GLASSFAIL also appears if
inappropriate limits have been entered into the transmitter.
If the measurement system was previously commissioned and operating correctly,
GLASSFAIL likely means a real problem exists. However, if the system is being started up or
if the advanced diagnostic feature is being used for the first time, GLASSFAIL could be
caused by a miswired sensor or by programmed limits that are not correct for the sensor.
Diagnostics and troubleshooting
Instruction Manual 55
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