User manual

H36.0.13.6C-07
GREISINGER electronic GmbH Hans-Sachs-Straße 26 Tel.: [phone] / 9383-0 http://www.greisinger.de
D-93128 Regenstauf Fax: [phone] / 9383-33 Email: [e-mail]
GMH 3691 GOG
For quick and cost-effective measurement of residual oxygen,
check-up of protective atmosphere in food packagings and for selective “sniffing”
Scope of supply:
1 display instrument GMH3691
2 hand pump (compress to use, the hand pump automatically
draws in the measuring gas after release, period of drawing
about 30 seconds)
3 GOG oxygen sensor with penetration needle,
optimised for quick measurement of tiniest amounts of
gases
Checking the calibration:
In order to get the optimum precision of the measurings, we suggest to check the calibration before each
measuring. This check is done at normal ambient air.
Before the check or calibration, the sensor’s temperature has to be adjusted to the ambient temperature.
In order to optimise the operational readiness of the instrument it is good practice to store it directly at the
location, were the measurings should be made.
For the check of the calibration the protection cap of the needle has to be removed. Compress the hand
pump (while the instrument is switched on) and release it afterwards. Then, already after 10 seconds the
display should show a oxygen content of 20.9 ... 21.0%. If there are greater deviations we suggest to
calibrate the instrument according to the manual GMH3691 (chapter: Calibration of the oxygen sensor).
The Measuring:
Preparation / Recommendations
Before measuring we recommend to put a rubber foam sticker onto the package.
(see illustration on the right hand side).
The sticker prevents the package from tearing up due to the penetration of the
needle. Furthermore it prevents a gap between package and needle, no ambient
air can flow in. This would corrupt the measuring.
This is especially important for the accuracy of the measurement of packages with little gas volume.