OI-6900 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 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]-[Radio]-O-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:

  • Low Power Infrared—1-Year Max Battery Life

  • Photo Ionization Detector– 14 Days Max Battery Life

  • Electrochemical—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: -40 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: 5.42 in. L x 6.03 in. W x 17.03 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

Approvals: CSA Certified Explosion/Flame-Proof

Hazardous Location Certifications and Approvals:

  • Class I, Division 1, Group C and D, T6

  • Ex d IIB T6

  • Zone 1, AEx d IIB T6

Hardware Warranty: Limited one year

Sensor Element Warranty: Varies with Sensor Element and Type


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

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

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


OI-6900 Certificate 1

OI-6900 Certificate 2

OI-6900 Certificate 3

OI-6900 Certificate 4

OI-6900 Certificate 5


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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-2014B-10Analog Sensor Board for PID Sensor Elements, 0-10 PPM Scale, Used in Battery Powered Sensor Assemblies
OI-2014B-20Analog Sensor Board for PID Sensor Elements, 0-20 PPM Scale, Used in Battery Powered Sensor Assemblies
OI-2014B-50Analog Sensor Board for PID Sensor Elements, 0-50 PPM Scale, Used in Battery Powered Sensor Assemblies
OI-2014B-1KAnalog Sensor Board for PID Sensor Elements, 0-1000 PPM Scale, Used in Battery Powered Sensor Assemblies
OI-2014B-2KAnalog Sensor Board for PID Sensor Elements, 0-2000 PPM Scale, Used in Battery Powered Sensor Assemblies
OI-2015-SB-NECAnalog Sensor Board for Electrochemical Sensor Elements, Please Specify Gas Type
OI-2016-SB-O2Analog Sensor Board for Oxygen Sensor Elements
OI-2017-SB-LPIRAnalog Sensor Board for Low Power Infrared Sensor Elements
OI-2000-CAP-ASSYSensor Housing Cap with Flame Arrestor and O-Ring
OI-500-BSensor Housing Rainguard
OI-410Calibration Cup Kit, Includes 3 Feet of Tubing
OI-501-77 Wire Remote Sensor Housing Mounting Kit, Does Not Include Cable
OI-SENSOR-CABLERemote Sensor Kit Cable, Sold per Foot

Additional information

Gas Type

H2S, CO, O2, HCN, SO2, H2, LEL, CL2, 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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