In order to measure oxygen content in the system, the oxygen sensor is installed in the main chamber on the right side above the door. This position is the most sensitive to the entrance gas during sample transfer.
The signal from the oxygen sensor is sent to the indicator outside glove box through electrical feed-through. This feed-through has extra pins for optional other sensors. The oxygen indicator is installed in front of clear plastic sheet and measure the oxygen content in voltage with millivolt range.
The value of oxygen content can be converted from the reading voltage according to the relation provided in section VI. The value of oxygen content for normal air should be in the range of few millivolt.
The oxygen indicator has battery inside therefore it is recommended to turn the indicator off reading. The battery can be replaced at the back of the meter.