WatchGas B.V. | Klaverbaan 121 | 2908 KD Capelle aan den IJssel | The Netherlands | +31 (0)85 01 87 709 | www.watchgas.eu | [email protected]
WatchGas is dedicated to continuously improving its products. Therefore, the specifications and features mentioned in this datasheet are subject to change without prior notice.
WatchGas Application Note 6 Part 2: WatchGas QGM Calibration v1.1 19-01-21
© 2021 WatchGas B.V.
Manual calibration
To calibrate the WatchGas QGM by hand, use the following steps:
1. Turn on the device and wait for all sensor to warm-up.
2. Press the single button 8 times to reach the calibration menu, indicated by the gas cylinder icon in the
upper right corner. The calibration gas concentrations are also displayed. Press and hold the button.
3. When in the calibration menu start a Zero Calibration by pressing and holding the button. The Zero
Calibration will take 10 seconds.
4. Connect the 0.5 L/min regulator to the gas cylinder. Attach the Last-O-More hose and calibration
adapter.
5. Connect the Calibration adaptor to the device
6. Press and hold the button to start the Span Calibration. Start the gas flow. The span calibration takes
90 seconds.
7. The calibration result is shown for each sensor individually. Afterwards, the device will return to
measurement mode.
8. Turn off gas flow and disconnect the calibration adapter. Wait for the gas readings to return to 0.
9. Reboot the device and verify calibration result by applying the same concentration of calibration gas,
preferably from another cylinder.
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