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Specifications subject to change without notice. | Tox_D_1119, Ex_D_1119, CO2_D_0320 | USA 200413 | Page 8 of 17
SC2-AT6 – UserManual
5.1 Calibration Process
Prior to calibration, activate the mode “Special Mode” at the basic device via tool or software: only then the calibration
menu is enabled. During the special mode the basic device doesn’t issue alerts.
For visual illustrations, consult the online document “PolyGard2-Sensor-Calibration-Procedure.”
• Connect calibration adapter carefully to the sensor cartridge
• Connect calibration tool to the printed circuit board
• Select the Sensor Cartridge to be calibrated by selecting the gas type
Zero calibration
• For toxic, oxygen & combustible sensors
• Apply synthetic air (flow rate according to the table “calibration”, 1 bar ± 10%) to the Sensor Cartridge.
• For infrared CO
2
sensors
• Apply pure nitrogen 5.0 (flow rate according to the table “Calibration”, 1 bar ± 10%) to the Sensor Cartridge.
• The current zero offset and the offset value of the first calibration is read with “Read”.
• When the value is stable, the new zero offset factor is calculated with “Calibration”.
The new offset factor is checked for plausibility and stored in the buffer memory. The current measured value is output
with the new offset factor and the offset display is updated.
• With “Save” the new offset factor is written in the SC memory, only then the Zero calibration has been
successfully completed. If you exit the menu without pressing “Save”, the original offset data for the measured
value calculation will continue to be used.
• ALERT: With a zero reading > 10% of measuring range during the zero calibration, zero calibration is not
possible.
Gain calibration
• Enter test gas concentration:
• For toxic, oxygen and CO
2
, value between 30-90% of the measuring range.
• For combustibles, value between 30-70% of the measuring range.
• The current sensor element sensitivity is read with “Read”.
• Apply test gas (flow rate according to the table “Calibration”, 1 bar ± 10%) to the Sensor Cartridge.
• When the value is stable, the new gain factor is calculated with “Calibration”.
The new gain factor is checked for plausibility and stored in the buffer memory. The current measured value is output
with the new gain factor and the sensor element sensibility is updated.
• With “Save” the new gain factor is written in the module’s memory, only then the gain calibration has been
successfully completed. If you exit the menu without pressing “Save”, the original gain data for the measured
value calculation will continue to be used.
Calibration will not be possible when the sensitivity of the sensor drops to 40% or lower; the Sensor
Cartridge must be replaced.