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7.4 Determining if an instrument or sensor is faulty
The following test can be performed to help determine if the pH Cube or the pH
sensor is faulty.
1. Set the Calibrate control approximately to the centre (as it is shown in the
diagram in section 1.1.
2. Disconnect the pH sensor.
3. Connect the centre pin of the Sensor connector with the outside frame of the
connector, using a short piece of wire or a paper clip etc.
4. If the pH Cube is operating correctly, the reading should be totally stable at
around pH7.00 with the wire firmly in place. If not, the meter requires
servicing.
5. Now carefully disconnect the wire from the centre pin only (make sure the
other end of the wire remains connected to the outside frame of the
connector).
6. The reading should steadily drift away from 7.00 (either up or down) at a rate
of approximately 1 pH or less every 3 seconds. If the drift rate is faster than
this, then input circuitry of the pH Cube may be faulty and could require
servicing.
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