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2. In the Service menu, push the up arrow three times.
The display shows the IR cal screen.
3. Make sure that the temperature of the IR cell is in the range of 48 to 51 °C. Apply the zero gas
directly to the cell. Let the gas flow for 10 minutes at 200 cc/minute.
4. Identify the IR span gas concentration (1000 ppm or 10000 ppm CO
1000 ppm, LK1 must be out. If the span gas is 10000 ppm CO
Figure 19
on page 37.
Zero adjustment
Make the zero adjustment on the 8000 display/controller board. Refer to
1. Turn the screw clockwise to increase the voltage. Turn the screw counterclockwise to decrease
the voltage. Refer to
2. When the zero gas reading is stable, adjust the Zero potentiometer so that the voltage is between
0.26 and 0.27 V.
0.27 V gives a CO
gas ppm reading on the display could be zero or below zero. The slight increment above zero
makes sure that the gas ppm reading is in a positive range.
36 English
Figure
19.
ppm reading slightly above zero. 0.25 V gives a zero reading, but the actual
2
). If the span gas is
2
, LK1 must be in. Refer to
2
Figure 1
on page 6.
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