8-12 Chapter 8: Calibration
SHB_U14
Initial zero calibration (Start point calibration)
Accessories • Zero gas
• PC with TCT
When should an
initial zero calibration
be performed?
• Since the analyzer module initial calibration was performed with dry gas, it may be
necessary to perform an initial zero calibration with the unit in an operational state
using an operative gas preparation system (cooler). This applies to the following
IR detectors:
SO
2
with measurement ranges < 500 ppm
NO with measurement ranges
< 750 ppm
Here any residual cross-sensitivity to H
2
O will need to be calibrated.
• After performing an optical alignment.
Offset drive is thus set to 0.
• After exceeding the Offset half message, in order to reset the status message.
Be careful, this can involve a device failure.
Execution • Initial calibration must be performed on each IR detector individually.
• Initial calibration is menu-driven.
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