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:
Automatic
Adjustment of atmospheric pressure:
Via turning knob from 800 to 1100 mbar absolute
Ambient temperature:
0 to 45°C
Display:
3 1/2 digit LCD, approx. 13 mm high
Electrode:
Active oxygen electrode with automatic pressure compensation,
approx. 4 m of cable with plug
Analog output:
1 mg/l = 100 mV, connection via monoplug, dia 3.5 mm
Power supply:
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)
Battery service life:
Approx. 150 operating h
Low battery warning:
Automatic; "BAT" displayed in case of low battery voltage
Dimensions of housing:
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.
Weight:
Approx. 450 g (incl. battery and electrode)
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
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.
