Thermo Fisher Scientific CyberScan pH 10/pH 100 - Manual (Page 56)

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13 TROUBLE-SHOOTING
PROBLEM PROBABLY CAUSE REMEDIAL ACTION
Nothing is displayed when the
ON/OFF key is selected. 1. Batteries not in place.
2. Batteries (+ & - poles) not in
correct polarity.
3. Weak batteries.
1. Insert batteries.
2. Re-insert batteries in the
correct polarity.
3. Replace batteries or attach
AC adapter.
Unstable reading 1. Insufficient reference
electrolyte in electrode.
2. Broken electrode.
3. External “noises” or induction
(e.g. electrical ‘noise’ caused
by a nearby motor).
4. Dirty electrode.
1. Fill electrode with reference
electrolyte.
2. Replace electrode.
3. Remove or switch off
interfering device.
4. Clean the electrode.
Rejuvenate if necessary.
Slow responses. 1. Dirty electrode. 1. Clean electrode. Rejuvenate
if necessary.
Meter is not responding to key
press. 1. HOLD mode in operation.
2. Broken electrode.
3. Internal program error.
1. Cancel HOLD mode.
2. Replace electrode.
3. Reset all internal programs
by re-inserting battery.