Compur STATOX 4120 - Manual (Page 29)

Compur Statox 4120
9. The option zero adjustment
This option is available for COCl
2
sensor heads with measuring range 0.3 ppm only. The zero
adjustment of the sensor is started via diagnostic box.
System requirements:
Sensor head EPROM index 18c, control module EPROM index 03a, diagnostic box EPROM index 02.
A zero adjustment must only be done in clean air. It is started with the buttons ZERO + ENT. It
should be done before starting a calibration.
The set zero value is not visible.
If no zero adjustment has been done ever, the default value is 0.
After replacing a control module, a new zero setting has to be carried out. The zero value is
stored in the control module and is transmitted to the sensor head.
An error message C1 caused by a too high sensor zero current will only be cancelled after a
successful self test.
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