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MODEL 1054B C
Absolute Conductivity. As an aid in determining
whether a problem exists in the conductivity section of
the sensor or analyzer, or the temperature compensat-
ing circuits, the absolute conductivity (the uncorrected
conductivity value, without temperature compensation)
of the process can be displayed. To do so:
1.
Press ACCESS key twice.
2.
SEt will be displayed briefly followed by Cin.
SELECT Cin to read the absolute conductivity.
3.
4.
To return to normal operation, press PV.
Temperature Sensor accuracy. If the temperature
sensor in the conductivity sensor is suspect, measur-
ing the resistance across the T.C. element and com-
paring the corresponding temperature reading can be
used in the evaluation of the sensor. Allow enough time
for the T.C. element to stabilize to the surrounding tem-
perature. Each 1°C change corresponds to a change
of 0.385 ohms.
8.2.4 Subassembly Replacement Considerations.
CPU Board Replacement. If a problem exists on the
CPU board, and replacement is required, specific pro-
cedures included with the new board must be followed
or the microprocessor will be improperly programmed.
Should this occur, it will be necessary to return the ana-
lyzer to the factory for reprogramming.
Power Board Replacement. If it becomes necessary
to replace the power board, the CPU board will need to
be recalibrated following the specific procedures that
are included with the power board. Failure to follow
these procedures exactly will cause the microproces-
sor to be improperly programmed and require the
return of the analyzer to the factory for reprogramming.
8.2.5 Instrument Electronic Check. This procedure
will allow the operation of the analyzer to be evaluated
by simulating a known conductivity input.
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DIAGNOSTICS AND TROUBLESHOOTING
1.
Disconnect the conductivity sensor input leads
from TB2-1, 3, 6 and 7. Install decade box or resis-
tor leads to TB2-1 and 3 and a jumper to TB2-6
and 7 (see Figure 8-1).
2.
With instrument power on, enter the SEt menu and
turn Atc to oFF. Set manual temperature compen-
sation to 25°C (see Section 4.4 and Figure 4-3).
3.
Set cell constant to 1.0 (see Section 5.1.1).
4.
To simulate a desired conductivity input, an appro-
priate resistance value may be calculated by
Formula or selected from the conductivity (µmhos)
vs resistance (ohms) table (see Figure 8-1).
5.
Simulate conductivity input and evaluate the ana-
lyzer response.
8.3 INSTRUMENT MAINTENANCE. To maintain the
appearance and extend the life of the enclosure, it
should be cleaned on a regular basis using a mild soap
and water solution followed by a clean water rinse.
SECTION 8.0
35
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Troubleshooting
