Endress+Hauser Oxymax W COS61, Operating Instructions Manual

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Oxymax W COS61 Troubleshooting
Hauser 25
9 Troubleshooting
9.1 Troubleshooting instructions
!
Note!
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
"
Caution!
Only authorized 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.
Problem Check Remedial action
No display, no sensor
reaction
Mains voltage to the transmitter? Connect mains voltage.
Sensor connected correctly? Set up correct connection.
Medium flow available? Create flow.
Buildup on the fluorescence cap? Clean sensor
With a TOP68 connection: Humidity or dirt in
plug? Clean connection (cleaning alcohol) and
dry it.
Displayed value too high Temperature display clearly too low? Check sensor, if necessary send sensor in
for repair.
Displayed value too low
With a TOP 68 connection: Humidity or dirt in
plug? Clean connection (cleaning alcohol) and
dry it.
Sensor calibrated? Recalibrate
Medium flow available? Create flow.
Displayed temperature clearly too high? Check sensor, if necessary send sensor in
for repair.
Buildup on the fluorescence cap? Clean sensor
Fluorescence cap worn out? Replace
Strong deviations in
displayed value
Fluorescence cap damaged? Fluorescent cap replacement
EMC interference on the measuring system? Remove outer shielding of sensor and
extension cable at terminal S. Cut
measuring and signaling lines from h.v.
power lines.
Check Action Setpoint
Voltage inspection
With the sensor connected, test the
operating voltage on the COM 2x3-WX/WS
transmitter between terminals 85 and 0: +15 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
O
key)
Zero point inspection
Immerse the sensor in zero solution
1)
. Display near to 0 mg/l (0% Sat)
Open the measuring chamber and dry the
electrodes.