OI-675 GEN I Electrochemical Sensor Assembly


The Otis Instruments, Inc. Model OI-675 Electrochemical Sensor Assembly is a versatile system with the ability to detect a variety of gases. The OI-675 Sensor Assembly’s key feature is magnetically triggered non-intrusive calibration. With all adjustments made at the assembly, one-man non-instrusive calibration is quick, easy, and allows the device to remain Class I, Divison 1, Groups C & D certified while in the field. The OI-675 incorporates any “4” series electrochemical sensor element and the OI-352 two-wire loop (4-20mA output) amplifier card. An extended life-expectancy, paired with the ability to withstand extreme climatic conditions and harsh environments, make the OI-675 a flexible and dependable safety tool for gas detection.

Power Input: 12-24 VDC


  • “4” Series

  • Electrochemical

Sensor Temperature Range: -30 to 50 C (for standard gases)

Enclosure: Moore Explosion Proof


  • CSA Certified

  • Class I, Div. I

  • Groups C & D

Amp/Transmitter: 4-20mA output

Accuracy: +/- 5% full-scale


  • Device- One year (limited)

  • Sensor- Two years (varies with sensor type)

Gas Type: H2S, CO, O2, SO2

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