Process Specific Errors - OEM OPM223 Operating Instructions Manual

OPM223/253
9.3
Use the following table to localise and rectify any errors occurring.
Errors Possible cause
Device cannot be
operated, display value Operation locked
9999
Reference system toxified
Diaphragm clogged
Measuring chain zero- Measuring line open
point cannot be adjusted
Sensor asymmetry voltage too high
Potential matching (PA/PM)
transmitter ⇔ wrong medium
Sensor contaminated
Sensor ageing
No or creeping change
of display
Sensor defective (reference lead)
No internal buffer
No high-impedance connection
(moisture, dirt)
Measuring chain slope
not adjustable/slope too
Device input defective
small
Sensor ageing
Hair-line crack in the glass
membrane
Measuring chain slope
not adjustable/no slope
No high-impedance connection
(moisture, dirt)
Sensor not immersing or protection
cap not removed
Air cushion in assembly
Ground connection at or in device
Permanent, incorrect
measured value
Hair-line crack in the glass
membrane
Impermissible device operating
status (no reaction to key
actuation)
Incorrect sensor connection
Incorrect temperature
Measuring cable defective
value
Incorrect sensor type

Process specific errors

Tests and/or remedial measures
Press CAL and MINUS keys
simultaneously
Test with new sensor
Clean or grind down diaphragm
Short-circuit pH input on instrument
⇒ display pH 7
Clean diaphragm or test with another
sensor
Asymm.: no PM or PM at PE
Symm.: PM connection mandatory
Clean sensor.
Replace sensor.
Replace sensor.
Check KCl supply (0.8 bar (11.6 psi)
above medium pressure).
Check cable, plug connector and
junction boxes.
Check device directly.
Renew sensor.
Renew sensor.
Check cable, plug connector and
junction boxes.
Check installation position, remove
protection cap.
Check assembly and orientation.
Perform test measurement in insulated
vessel, poss. with buffer solution.
Renew sensor.
Switch device off and then on again.
Check connections using wiring
diagram.
Check cables for interruptions/short-
circuit/shunt.
Set type of temperature sensor at the
device (field B1).
Trouble-shooting
Tools, spare parts
See "Function of keys" section.
pH/ORP sensor
HCl 3 %, use file (only file in one
direction)
HCl 3 %, use file (only file in one
direction); sensor
See "Electrode installation and
measuring cable connection" section
See "Cleaning pH/ORP electrodes"
section.
New sensor
New sensor
KCl (OPY 4-x)
pH simulator, insulation, see "Checking
the connecting lines and boxes" section
pH simulator
pH sensor
pH sensor
pH simulator, insulation, see "Checking
the connecting lines and boxes" section
Plastic vessel, buffer solutions
pH sensor
EMC problem: if this persists, check the
grounding, screens and line routing or
have checked by responsible service.
Wiring diagram "Electrical connection"
section
Ohmmeter
Glass electrode: Pt 100
ISFET: Pt 1000
81