Trouble-shooting
Oxymax COS61
26
Hauser
9
Trouble-shooting
9.1
Trouble-shooting instructions
Make sure you comply with the instructions for troubleshooting in the Operating Instructions
of the transmitter. If necessary, carry out a test of the transmitter.
9.2
Sensor checks
Only authorised and trained personnel may test the sensor!
You will also require a multimeter (voltage, resistance).
1
How to use the zero solution:
1.
Fill a large beaker (1.5 - 2 l) with approx. 1 l of water.
2.
Pour a cap-full of the zero solution into the water.
3.
Immerse the sensor into the water and wait a sufficient period of time (15 min. for oxygen
depletion).
The display drops to around 0 mg/l (0 %SAT).
Problem
Check
Remedial action
No display, no sensor
reaction
Mains voltage to the transmitter?
Connect mains voltage.
Sensor connected correctly?
Set up correct connection.
Coating on the fluorescence cap?
Clean the sensor.
Medium flow available?
Create flow.
Displayed value too high
With a TOP 68 connection: humidity or dirt in
plug?
Cleaning of the TOP 68 plug-in
connection by using cleaning alcohol.
Temperature display clearly too low?
Check sensor, if necessary send
sensor in for repair.
Displayed value too low
Humidity or dirt in plug?
Cleaning by using cleaning alcohol.
Sensor calibrated?
Recalibrate
Medium flow available?
Create flow.
Displayesd temperature clearly too high?
Check sensor, if necessary send
sensor in for repair.
Coating on the fluorescence cap?
Replace
Fluorescence cap worn out?
Replace
Strong deviations in
displayed value
Fluorescence cap damaged?
Replace fluorescence cap.
EMC interference on the measuring system?
Remove outer screening of sensor and
extension cable at terminal S.
Cut measuring and signalling lines from
h.v. power lines.
Check
Measure
Setpoint
Voltage inspection
With the sensor connected, test the
operating voltage on the transmitter:
COM2x3-WX/WS
between terminals 87 and 0: +8 V
between terminals 88 and 0: –8 V
Slope inspection
Place the sensor in the air, and dry with a
paper towel.
After 10 minutes:
approx. 100% SAT (4 times plus-key)
Zero point inspection
Immerse the sensor in zero solution
1
.
Display near to 0 mg/l (0% Sat)
