OI-6900 Non-Explosion Proof Dual Battery Powered WireFree Sensor Assembly


The Otis Instruments WireFree Non-Explosion-Proof OI-6900 Series Ambient Air Toxic Gas Detector is a wireless, dual battery -powered assembly that uses an electrochemical sensor element to detect a variety of toxic gases. Magnetic switches allow for non-intrusive calibration and system setup while 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]-T-2B

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





Sensor Type: Electrochemical 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: 2-Year Max. Battery Life

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 +54°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: 15.76 in. L x 5.11 in. W x 5.37 in. H (Max. Dimensions w/ Attachments)

Total Weight: 6 lbs.

Hardware Warranty: Limited one year

Sensor Element Warranty: Varies with Sensor Element and Type


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

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

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


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Part NumberDescription
OI-WF691-BBattery, 3.6VDC/19AH Li-Ion D-Cell, Non-rechargeable
OI-6900-CB-2B-PCAOI-6900 Control Board with LCD Screen Installed
OI-LCD-102LCD Screen with White LED Backlight
OI-6900-FP-KITOI-6900 Faceplate Kit with Faceplate, Label, (2) Thumbscrews, and Foam to Secure LCD Screen
OI-6900-RB-2B-PCAOI-6900 Radio Board, No Radio Module Installed
OI-RADIO-2.4-THGEN II 2.4 GHz Radio Module
OI-RADIO-900-LAIRDGEN II 900 MHz Radio Module
OI-432-UFL-4u.FL Cable for Connecting Radio Module to Board
OI-AN-2.4-RIGID-R2.4 GHz Antenna, Non-Flexible, Right Angle
OI-AN-900-FLEX-R900 MHz Antenna, Flexible, Right Angle
OI-420Otis Magnet
OI-402-5PACKPackage of 5 Desiccant Bags, 6 Grams per Bag
OI-495-OMain Enclosure O-Ring
OI-2015-NXP-R-[GT]NXP Sensor Assembly Adapter Board for Electrochemical Sensors, Right Angle Pins, Please Specify Gas Type When Ordering
OI-2016-NXP-RNXP Sensor Assembly Adapter Board for Oxygen Sensors, Right Angle Pins
OI-2017-NXP-RNXP Sensor Assembly Adapter Board for Low Power Infrared Sensors, Right Angle Pins
OI-254NXP-BASENXP Sensor Housing for Electrochemical and Oxygen Sensor Elements
OI-MIPNXP-BASENXP Sensor Housing for Low Power Infrared Sensor Elements
OI-254NXP-CAPNXP Sensor Housing Cap for All NXP Sensor Housings, Includes Cap, Stainless Steel Screen and Moisture Filter
OI-410-NXPCalibration Adapter Kit for NXP Sensor Assemblies, Includes 3 Feet of Tubing

Additional information

Gas Type

H2S, CO, O2, HCL, HCN, NH3, NH3A, NO2, SO2, H2, LEL, CL2, HF, PH3

Radio Configuration

Gen II 900 MHz Radio, Gen II 2.4 GHz Radio


Non-Explosion Proof

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