
Software Overview and Explanations
Installation and Operation Manual - COMTEC
®
6000
28
Doc.-ID: COM6000_11022020_EN
4.2.11
Automatic Calibration (ACAL)
Automatic calibration enables a cyclic, time-based or remote controlled calibration (using the digital input) of the
sensors. The ACAL can be globally switched on or off and can only be started from the main screen of the display.
When a 2 Point ACAL is set, a test gas bottle must be permanently connected and turned on.
Info
Make sure that the test air and test gas volume and flow settings needed for calibration are correct.
For systems with flow monitoring: The flow rates can be checked under
System Checks
O
2
sensor check
For systems without flow monitoring: Check the flow rates through an external flow meter and adjust to
150 - 180 l/h via an external throttle valve.
Only when the ACAL is switched on, are the ACAL settings visible. The calibration method determines whether the
ACAL is carried out as a 1 point calibration only with test air (instrument air or ambient air) or as a 2 point calibration
with test air and test gas. Ambient air is preset to a fixed O
2
concentration of 20.95% and this value is not shown nor
can it be changed.
The ACAL can be started by:
Time:
Time based start with set intervals in days and the corresponding time
Time + Digital Input:
Same as "Time", additionally a control voltage of 12-24V DC must be applied to the "calibration
release" so that an automatic calibration can be started.
Digital Input:
A control voltage of 12-24V DC must be applied to the "calibration release" so that an automatic
calibration can be started. If the control voltage is still present after the calibration has ended, the calibration will im-
mediately restart
Info
For a CO
e
1 or 2 calibration without a calibration the O
2
sensor, separate span gas values can be used.