User Manual PolyGard
®
2 Sensors 2023-11 Page 17 | 40
6.2 Calibration Work
Prior to calibration you have to activate the mode “Special Mode” at the Board, only then the calibra-
tion menu is enabled. During the Special Mode, the Board does not issue alerts.
• Wait for the running-in time calibration to elapse.
• Connect calibration tool to the Board.
• Open calibration dialog.
• Select the Sensor to be calibrated.
• Connect calibration adapter carefully to the Sensor (exception: Calibration with clean ambi-
ent air).
6.2.1 Zero Calibration
Caution:
For semiconductor sensors, observe the laser engraving and date of manufacture on the
calibration protocol (see chapter 6.2.1, point B).
A: General
• Select zero calibration dialog.
• The current zero offset is read out by selecting “Display”.
• Apply synthetic air to the sensor head for 3 min (nitrogen to CO
2
and O
2
sensor heads for at
least 5 min) with a flow rate according to Table 4 to Table 7 and with an output pressure of
1 bar ± 10 %.
• After the application time has elapsed, the new zero-offset factor is calculated by “Calculate”,
checked for plausibility and stored in the temporary memory. The current measured value is
output with the new offset factor and the offset display is updated.
• The new offset factor is written by "Save", only then is the zero calibration completed. If the
menu is exited without saving, the original data will continue to be used for the measured
value calculation.
If the measured value is > 10 % of the measuring range, calibration of the zero point is not possi-
ble.
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