6 Adjustments
The 9120, 30, 40, 80 and 81 Analyzers have been designed to require minimal
electronic adjustment. The sample sensor circuit may require adjustment following a
change of the sample sensor or during routine troubleshooting. The temperature
adjustment is active only for models 9140/9180/9181 and requires the temperature
adjustment test plug for correct calibration of the temperature circuit.
6.1 Sample Sensor Adjustment
Select TEST SAMPLE SENSOR in the SERVICE FUNCTIONS menu
which will display the current sample sensor setting. Adjust R93 Sample Sensor
Adjust located at the top of the ISE SBC card to a value of 100. Press YES to
turn on peristaltic pump and ensure displayed value remains constant.
Raise sample door and aspirate clear fluid (e.g. water). Displayed reading should
now be 150 or greater.
Note: R93 can be accessed through the rear cover vent slot and is located at
the top center on the circuit card.
6.2 Temperature Adjustment (9140/9180/9181 only)
Select AMPLIFIER TEST in the SERVICE FUNCTIONS menu which will
display the current amplifier voltages. Press NO twice to display the temperature
voltage and actual temperature display. Unplug the sample sensor and fit the
Temperature Adjustment Test Plug in place of the sample sensor plug. Adjust R54
located on the SBC Board for a display of 3000mV. Unplug the Temperature
Adjustment Test Plug and fit the sample sensor connector to display the actual
temperature of the measuring chamber.
Due to the elevated temperature inside the analyzer, it is normal for the
displayed temperature to be several degrees C higher than the actual room
temperature.
If no Temperature Adjustment Test Plug is available, place a quality thermometer
(preferably mercury) next to the right side electrode holder. With the front door
open, wait approx. 10 min. Then adjust the displayed temperature to match the
reading on the thermometer.
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