ELTRA ONH-2000 - 1.12 Negative TC Cell Baseline

 2002 by ELTRA GmbH Germany – January 2002 – Service Manual OH 900 / ON 900 / ONH 2000
1.12-1
1.12 1.12 The base line of the TC cell is negative ( see 2.12 )
The instrument must work for min. 5 minutes on position 2, until the baseline is stable at
nearly 0 Volts. If the baseline is lower than -1 V, maybe some air remained in the
reference side of the TC cell. The reference flow is much lower than the analytical flow.
In this case it is necessary to purge the reference side:
 Open the right side cover of the instrument
 Close the gas tube of the furnace gas inlet three times for 2 seconds.
 Close the right side cover of the instrument
Two minutes after this procedure the baseline should stay nearly at zero. Otherwise check
the thermistors.