triOS Free Chlorine, Operating Instructions Manual

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Us
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Calibr
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Calibr
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M
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M
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M
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M
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Comm-
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Comm-
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In
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In
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G
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Inf
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G
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Inf
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FA
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FA
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Technical
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Technical
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D01-905en201912 Manual eCHEM Free Chlorine
Malfunction and Maintenance
// Free Chlorine
Electronics test (dry
test) 1. Unscrew the membrane cap
2. Rinse electrode finger carefully, dry carefully with a clean cloth
3. Connect sensor to controller, wait for approx. 5 min
4. Read the original sensor signal from the controller
Controller must display 0 ppb.
-> If the sensor signal corresponds approximately to the above-mentioned value, the electronics
are likely to be OK.
-> If the measured value deviates significantly from the above-mentioned value, the sensor must
be sent in for inspection.
Zero point test After electronics test:
1. Prepare the sensor for commissioning according to chapter 3.1 of the operating instructions
2. Connect the sensor to the measuring/control unit
3. Carefully place the sensor in a beaker with clean tap water (no disinfectant!)
4. Stir the sensor in the beaker for approx. 30 seconds (without creating air bubbles)
5. Then let the sensor stand still in the beaker and wait until the run-in time has passed (at least 1
hour)
6. Read the original sensor signal from the measuring/control unit or measure it with a digital
multimeter
7. The sensor signal should approach zero
-> If the sensor signal approaches zero, the zero point is likely to be OK.
-> If the measured value deviates significantly from zero, the sensor must be serviced in ac-
cordance with chapter 6.2 of the operating instructions and the "Zero point test" repeated It has
to be taken into account that a freshly cleaned working electrode (measuring electrode) has a
relatively high zero point. The sensor then needs a few days to reach its lowest zero point again.
-> If the measured value does not reach zero even after maintenance was carried out, the sensor
must be sent in for inspection.
For sensors with very small measuring ranges or high sensitivity, the zero
points are in principle somewhat higher than for sensors with large measu-
ring ranges or low sensitivity.
NOTICE