OI-6900 Group B Explosion Proof Dual Battery Powered WireFree Sensor Assembly


The Otis Instruments WireFree OI-6900 Series Ambient Air Hazardous Gas Detector is a wireless, dual battery-powered assembly that uses an electrochemical or low-power infrared sensor element to detect a variety of toxic or combustible gases. The OI-6900 offers nonintrusive calibration, allowing the device to remain Class I, Division 1, Groups B, C and D certified, while adjustments are made in the field. The OI-6900 continuously monitors the gas level of the surrounding environment and reports once a minute, the reporting rate will increase to once every five seconds when the detected gas is above the Background Gas Set-point. This set-point is adjustable to account for sites that may have a constant low level of gas always present. The display screen always shows the present gas concentration.

Part Number Formula: OI-6900-[Gas Type]-[Radio Option]-K-2B

See Related: OI-501-7, 7-Pin Remote Sensor Kit for use with OI-6900.





Sensor Type: Electrochemical, Photo Ionization Detector or Low-Power Infrared Sensor

Power Type: Dual Battery-Powered Operating Voltage 3.6 V (19 Ah each, 38 Ah total) Lithium-Thionyl (Li-SOCl2) Battery, with Connector (Non-Rechargeable)

Battery Life:

  • 1-Year Max. Battery Life (Low-Power Infrared)

  • 14 Day Max. Battery Life (Photo Ionization Detector)

  • 2-Year Max. Battery Life (Electrochemical)

RF Connection: External N-Female Radio Frequency (RF) Connector

Display Screen:

  • 102×64 Resolution Graphical LCD Screen

  • Transflective (Sunlight Readable) with LED Backlight


  • 3 Push-Buttons (MENU, ADD, and SUB)

  • 3 Magnetic Non-Intrusive Switches for Calibration (MENU, ADD, and SUB)

Customizable Settings: Adjustable Background Gas Setting (1% to 10% of Full Scale)

Tamb Temperature Range: -20 to +60°C

WireFree Radio Options: GEN II 900 MHz (200 mW) Radio or GEN II 2.4 GHz (125 mW) Radio


  • 52 Networks (GEN II 900 MHz Radio) or 78 Networks (GEN II 2.4 GHz Radio)

  • 255 Addresses per Network

Product Dimensions: 5.30 in. L x 8.26 in. W x 17.76 in. H (Max. Dimensions w/ Attachments)

Total Weight: 6 lbs.

Remote Sensor Kit (Additional feature): OI-501 Remote Sensor Kit with Enclosure (7 pin)

  • Electrochemical Sensor Max Length: 250 Feet

  • Low Power Infrared Sensor Max Length: 40 Feet

  • Photo Ionization Detector Max Length: 35 Feet


  • UL/CSA/FM Certified Explosion/Flame-Proof Main Enclosure

  • QPS Certified Explosion/Flame-Proof Sensor Housing

Hazardous Location Certifications and Approvals:

  • Main Enclosure

    • Class I, Div. 1 & 2, Groups B, C, D

    • Class I, Zones 1 & 2, Groups IIB + H2, IIA

    • Class II, Div. 1 & 2, Groups E, F, G

    • Class III, Type 3, 4, 4X

    • NEMA 3, 4, 4X, 7 (B, C, D) 9 (E, F, G)

    • Ta= -20°C to +60°C

  •  Sensor Housing

    • Class I, Division 1, Groups B, C and D

    • TAmb= -40 °C to +60 °C

Hardware Warranty: Limited one year

Sensor Element Warranty: Varies with Sensor Element and Type


OI-6900-X-X-K-2B Data Sheet

OI-6900-X-X-K-2B Operation Manual

OI-6900-LEL-X-K-2B Operation Manual



Additional information

Gas Type

H2S, CO, O2, HCN, SO2, H2, LEL, PH3, VOC10, VOC20, VOC50, VOC1K, VOC2K

Radio Configuration

Gen II 900 MHz Radio, Gen II 2.4 GHz Radio


Explosion Proof

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