Looking into Oxygen sensors. It turns out that these are often part of Lower Explosive Limit (LEL) (Wiki) sensors.
While the first sensor on this page is the GasTech 1214S GasTechTor (Wiki: Explosimeter) the manual for the 1238ME is on line and that unit looks very similar.
The bottom contains the sensors and pump and the top contains the meter, alarm sounder, control panel and electronics.
The metal fitting is the input which goes directly to the sensor housing/combustible gas sensor. It's output goes to to the air pump, it's output goes to the GasTech Oxygen
Fig 2 Terminal strip at left, top to bottom
Black Pump Wire
Red Pump Wire
Red Combustible Gas Sensor sensor wire
Green Combustible Gas Sensor sensor wire
White Combustible Gas Sensor sensor wire
The PCB is marked P2, P1, R, G, W
Fig 3 Oxygen Cell, Gastech No. 65-0601, Code 9514
hand written: 12 May 95
The pin (3) to the right of the white dot is the Black sensor wire
and to the left ( 4) of the white dot is the White sensor wire.
Connector is SATO parts, Japan
Fig 5 Oxygen Cell
Fig 6 Combustible Gas Sensor
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