18.3 Determining if an instrument or electrode is faulty
The following test can be performed to help determine if the WP-80 or the
pH electrode is faulty.
1. Initialize the WP-80 (see section 15).
2. Disconnect the pH electrode.
3. Connect the centre pin of the pH/mV connector with the outside frame
of the connector, using a short piece of wire or a paper clip etc.
4. The meter should read approximately 7.00. If you press the key,
the
WP-80 will calibrate to around 6.88 pH, depending upon the
temperature readout.
5. If the WP-80 is operating correctly, the reading should be totally stable
with the wire firmly in place. If not, the meter requires servicing.
6. 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).
7. 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 WP-80 is faulty and requires
servicing.
18.4 Instrument firmware version number.
If you need to phone or fax TPS for any further technical assistance, the
version number of your WP-80 firmware may of benefit to us. The version
number is displayed by the WP-80 at turn-on.
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