Thermo Fisher Scientific CyberScan pH 1500 - Manual (Page 50)

Instruction Manual CyberScan pH1500
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11 CLEANING
This meter requires no regular maintenance, but it is recommended
to occasionally wipe down the front with a damp cloth from time to
time. If there are any further questions regarding maintenance, call
the Eutech Instruments Technical Support hotline at (+65) 6778
6876.
12 TROUBLESHOOTING
Most troubles arise out of a problem with the electrode, not the meter.
However, a meter check can be performed, and is simple to do.
1. To test the meter for correct operation, install the BNC (input)
shorting cap. Press the mode key to access the mV mode, and
note the mV reading. If the meter reads 0+/-1 mV, it is measuring
correctly.
2. The meter will display Electrode Error when it detects an error in
electrode response. During standardization, the message
indicates that the electrode has a slope of less than 90% or more
than 102%. The Electrode Error message can indicate a bad
electrode(s), bad buffer(s) or a bad standard sequence
technique.