The GMS20 is a high-accuracy oxygen sensor supplied in a M12 cylindircal housing. While developed for general use it is especially suited to those applications where space is restricted or the most basic form of sensor is required.

The sensor employs two ZrO2 discs with a small hermetically sealed chamber in between. One of the discs functions as a reversible oxygen pump, which is used to successively fill and empty the chamber. The second disc measures the ratio of the partial pressure difference and generates a corresponding sense voltage. A heat element produces the 700 °C required for the ZrO2 to operate as an O2 pump. The time taken for the pump to achieve specific minimum and maximum pressures within this chamber is a measure of the partial oxygen pressure of the environment.

The GMS20 has to be operated by an electronic measuring circuit that controls the sensor operation and signal processing. This circuit can either be incorporated into the customer’s own electronics, or be purchased as a separate interface board from SST.

FEATURES
• High-accuracy measurement
• Low power consumption
• No reference gas required
• Linear output signal
• No need for temperature stabilization
• Function testing and calibration in ambient air
• Long life

TYPICAL APPLICATIONS
• Heating boiler control
• Industrial process control
• Control of aircraft on board oxygen generation systems
• Automotive exhaust gas diagnostics
• Service instruments
• Monitoring environmental oxygen