Model 772 Oxygen Indicator

December 2011

Introduction

The Intercon Model 772 Oxygen Indicator incorporates a maintenance-free ceramic sensor, which can accurately display oxygen levels as small as 1 ppm (part per million).

Oxygen indicators with readout capabilities of only 0.1% (1000 ppm) or 0.01% (100 ppm) are not suitable for the welding industry as most precision welding is done below 70 ppm.

The ceramic sensor incorporated in this unit is encased in a robust housing and is designed for job site as well as clean room work. Power is an outboard supply connecting to standard 110/120 VAC receptacles. 220 VAC cords available upon request.

The Intercon Model 772 is designed to process the output from an oxygen sensor.

The 772 sensor type uses a stabilized zirconium oxide cell, which is heated and then exposed to the gases in a partial pressure environment. One side of the cell is in contact with a reference gas which is normal outside air; the other side is in contact with the sample gas being measured. Little maintenance is required except an occasional filter change. Yearly calibration should be done and can be performed by Intercon.

If the purging gas being measured is above 1000 ppm, the unit will not appear to respond, and display "999" until the sample gas value falls consistently below 1000 ppm.

Carrying case included with unit.

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