2002 by ELTRA GmbH Germany – January 2002 – Service Manual OH 900 / ON 900 / ONH 2000
2.5-1
2.5
2.5
Temperature regulation of the IR-cell:
The adjustment should preferably be done only when the analyser, and the
infrared cell have been in operation for at least one hour.
If the LED is always off, adjust P1 on the TH 61 board clockwise for higher
temperature set point.
If the LED is always on, adjust P1 counter clockwise for lower temperature
set point.
In case the LED is already blinking, adjust the flash rate of the LED to 50%
duty circle.
ATTENTION!
■ The effect of the readjustment will appear in a few minutes, as soon as the
temperature has changed to the new setting.
■ The voltage on TP1 ( TP2 = GND ) does not correspond to the actual temperature of
the IR-cell, but it corresponds to the power needed to keep the IR-cell at a constant
temperature.
■ When the environmental temperature goes down, the heaters of the IR-cell need
higher power to keep the temperature of the IR-cell constant. In this case the
voltage will go higher.
TH61
VDC
COM
TP2
TP3
TP1
06058
2-5-1
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