2002 by ELTRA GmbH Germany – January 2002 – Service Manual OH 900 / ON 900 / ONH 2000
1.4-1
1.4
1.4
The base line of the TC cell cannot be adjusted to zero
The baseline control of the TC-cell is different from the one for the IR-cell.
The values for the "low" and the "high" nitrogen ( or hydrogen, depending on the
instrument ) channels are produced by two different gain stages within one amplifier
connected to the TC detection cell.
The automatic base line control regulates the zero signal of the "high nitrogen" gain stage.
Only the high channel zero value appears on the display .
If the zero value of the "low nitrogen ( hydrogen )" channel is out of range, the electronic
board cannot control this signal to zero. In this case check the "high nitrogen (hydrogen)"
signal with
If the signal of the high channel is higher than ±0.4V, the low channel is out of range.
CAUTION :
Look for the reason of this drift! Adjust the flow rates or the thermostabilization, if
necessary.
If there is no fault, adjust the signal of the "high nitrogen ( hydrogen )" channel to zero
manually, see 2 .12
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