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Brief Operating Manual for Digital Oxygen Meter GOX 91
Specification
Measuring range:
Accuracy:
Temperature compensation:
Adjustment of atmospheric pressure:
Ambient temperature:
Display:
Electrode:
Analog output:
Power supply:
Battery service life:
Low battery warning:
Dimensions of housing:
Weight:
Points to be observed prior and during measuring:
Prior to measuring make sure that the electrode has assumed water temperature. To test please proceed as
follows: switch device to temperature indication and move electrode around in water until stable temperature is
displayed. The electrode is now ready for oxygen measurements.
When conducting O2 measurements, fresh water samples must constantly be fed to the electrode membrane
with a minimum flow velocity of approx. 30 cm/sec.
This flow is achieved by stirring the water samples with the electrode or by using a flow generator. The
minimum flow velocity has been reached if faster stirring does not result in a higher value on the display.
For measuring proceed as follows: 1. Put electrode in measuring media and wait till it has assumed medium
0.0 to 30.0 mg/l O2
0 to 199 % O2 saturation
0.0 to 45.0° C
~ 1.5 % +/- 1 digit (from 5 to 35° C)
Automatic
Via turning knob from 800 to 1100 mbar absolute
0 to 45°C
3 1/2 digit LCD, approx. 13 mm high
Active oxygen electrode with automatic pressure compensation,
approx. 4 m of cable with plug
1 mg/l = 100 mV, connection via monoplug, dia 3.5 mm
9 V-battery type JEC 6F22 (included in scope of supply) and
lateral mains supply socket for 2.5 mm dia monoplug (automatic
battery disconnection as soon as mains supply unit is plugged in)
Approx. 150 operating h
Automatic; "BAT" displayed in case of low battery voltage
Approx. 150 x 86 x 30 mm (height x width x depth); impact resistant
ABS plastic housing with integrated pop-up clip for table-top or
suspended operation.
Approx. 450 g (incl. battery and electrode)
temperature.
2. Set pressure compensation of the unit to current atmospheric pressure
(required only if values are to be displayed in %) by means of the "mbar"
potentiometer
3. Switch on device and set to temperature display. Check if electrode has
assumed water temperature by slightly stirring the water with the
electrode.
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Summary of Contents for GREISINGER GOX 91
- Page 1 Brief Operating Manual for Digital Oxygen Meter GOX 91 Specification Measuring range: 0.0 to 30.0 mg/l O2 0 to 199 % O2 saturation 0.0 to 45.0° C Accuracy: ~ 1.5 % +/- 1 digit (from 5 to 35° C) Temperature compensation:...
- Page 2 4. Switch over to oxygen measuring. Generate required flow velocity by stirring measuring media with electrode and read off measuring value as soon as stable value appears on display. Air calibration: Each measuring device has been subjected to a series of tests demanding maximum quality standards in all stages of manufacture and has been calibrated before leaving the factory.
- Page 3 For storage purposes place electrode in a container with dechlorized water up to the cable connection point. Make it a rule to unscrew the protection cap and to clean the membrane with a clean soft tissue before each measuring series.
- Page 4 After re-positioning, rinse membrane with water. We highly recommend to wait at least 30 to 45 minutes before starting to re-calibrate the unit. In order to make absolutely sure that measurements will be correct, allow electrode to stabilise for 12 hours (during the night) before re-calibrating as Teflon material, which is easily overstretched during positioning, will without fault return to its original state after some time.
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