OEM OPM223 Operating Instructions Manual page 80

Trouble-shooting
Error Display
no.
Below lower alarm threshold for
E154
period exceeding alarm delay
Above upper alarm threshold for
E155
period exceeding alarm delay
Actual value undershoots alarm
E156 threshold for longer than the set
permissible maximum period
Actual value exceeds alarm
E157 threshold for longer than the set
permissible maximum period
E162 Dosage stop
Dynamic range of pH converter
E164
exceeded
Dynamic range of reference
E166
converter exceeded
Warning: ISFET leakage
E168
current > 200 nA
Flow in main stream too low or
E171
zero
Switch-off limit for current input
E172
exceeded
E173 Current input < 4 mA
E174 Current input > 20 mA
E175 SCS glass warning
E177 SCS reference electrode warning
1) If this error occurs, there is no possibility of starting a cleaning session (field F8 not applicable with this error).
80
Tests and/or remedial measures
Perform manual comparison measurement if
necessary. Service sensor and recalibrate.
Check settings in the CURRENT INPUT and
CHECK function groups.
Check cable and sensor.
Check cable and sensor.
Check ISFET for abrasion and air-tightness,
replace as soon as possible.
Restore flow.
Check process variables at sending
measuring instrument. Change range
assignment if necessary.
Check process variables at sending
measuring instrument.
Check process variables at sending
measuring instrument. Change range
assignment if necessary.
Check electrode for glass breakage or hair-
line cracks;
Check medium temperature.
Measurement can continue until the error
occurs.
Check electrode for contamination and
damage; clean electrode; measuring can
continue until the error occurs.
Alarm contact Error current
Facty User Facty User
Yes No
Yes No
Yes No
Yes No
Yes No
Yes No
Yes No
No No
Yes No
Yes No
Yes No
Yes No
No No
No No
OPM223/253
Autom.
cleaning start
Facty User
No
No
No
No
No
—
—
No
No
No
No
No
No
No