Brandt Instuments Representing Otis Instruments Fixed Gas Detection Systems, wired and wireless
Brandt Instruments Representing Otis Instruments

Otis InstrumentsGas Detection SystemsLogo

Otis Instruments
Fixed Gas Detection System Accessories
Alarm Lights, Horns, Radios, Sensors, Calibration Gas
Wired & WireFree™ Replacement Sensors

home otis instruments fixed point detectors Accessories Otis Instruments Fixed System Accessories

Otis Instruments fixed gas detection systems are designed to provide continuous monitoring for a variety of common atmospheric hazards including oxygen deficiency and/or enrichment, combustible gases and vapors, and specific toxic contaminants such as:

Ammonia (NH3) Formaldehyde (CH2O) Nitrogen Dioxide (NO2)
Carbon Dioxide (CO2) Hydrogen (H2) Oxygen (O2)
Carbon Monoxide (CO) Hydrogen Chloride (HCL) Ozone (O2)
Chlorine (Cl2) Hydrogen Cyanide (HCN) Sulfur dioxide (SO2)
Chlorine Dioxide (ClO2) Hydrogen Fluoride (HF) Phosphine (PH3)
Combustible gas (LEL) Hydrogen Sulfide (H2S) PID sensor for VOC detection and many others
Fluorine (F2) Nitric Oxide (NO)  

The ability to display data and activate alarms in response to readings sent from remote on-site sensors make the Otis Instruments controllers an efficient way to monitor toxic gas hazards.  System configurations can include radios for WireFree™ communication.  With the addition of dry contact relays, signals can also be routed to and from other remote sensors such as temperature, pressure, tank levels as well as triggering lights, horns, alarms and fans.

Accessories for these systems include, alarm lights, horns, and kits for remoting sensors up to 250' from the controller (sensor dependent).  Ongoing system maintenance will require calibration and replacement sensors.


Otis Instruments

Horns, Lights, Sensor Remoting Kits & Radios

Otis Instruments OI-488 Dual Tone Horn

OI-488-KIT Dual Tone Horn

102 dB
12-24 VDC Power Source


OI-102WEP-X Explosion-Proof Horn

OI-102WEP-X Explosion-Proof Horn

 Class 1, Division 1, Groups C & D
 Class 1, Division 2, Groups A, B, C, & D
 Class 2, Division 2, Groups F & G
 24 VDC; 120 VAC; 240 VAC
8 Selectable Tone
Remote Control with Priority
UL Listed / NEMA 4X

OI-102WEP EXP Horn Data Sheet

Otis Instruments OI-481-EMS Pipe or Surface Mount Strobe

OI-481-EMx-Kit Pipe Mount Strobe
OI-481-x Surface Mount Strobe

 Amber, Red or Blue (x = A,R,or B)
1.5 Joules Flash
12-80 VDC Power Source

OI-481-EMS-Kit Data Sheet

Otis InstrumentsTriLite LED Alarm Light

OI-RGA-KIT TriLite LED Alarm Light

NEMA 4 Enclosure
24V DC or 120V AC
Red, Green or Blue, and Amber
-31° to 150° F

TriLite Data Sheet


Otis Instruments OI-4375-R-120 AC-Powered Hazardous Location Pipe-Mount Strobe


AC or DC Powered Hazardous Location
Pipe-Mount Strobe

Class I, Div. 2 Group A, B, C & D.
Class II, Div. 2 Group F & G.
Class III Div. 2
Cast aluminum construction
UL 1598 polycarbonate lens
Clear, Amber, Blue, Red, Green
120-240 VAC / 12-74 VDC input
8 Joule power supply
80 flashes per min (+/- 10%)

OI-4375 Alarm Strobe Literature

5 or 7-Pin Remote Sensor Kit

5 or 7-Pin Remote Sensor Assembly Kit

OI-501-5 is a 5-Pin Remote Sensor Kit with enclosure, for use with the OI-6000 Sensor Assembly.

OI-501-7 is a 7-Pin Remote Sensor Kit with enclosure, for use with the OI-6900, OI-6940, or OI-6975 Sensor Assemblies.

Remote Sensor Kit Data Sheet

Remote NXP Sensor Kit Data Sheet

The remote sensor kits have been tested for use up to 250 feet from the controller. Distance is sensor dependent. Call for information on application and sensor assistance.

Otis Instruments Gen I & Gen II WireFree Systems Radio Specifications

Gen I & Gen II Radios for
WireFree™ Systems

2.4 GHz
900 MHz

Radio Specifications


OI-412-NXP non-explosion proof sensor calibration adapter

OI-410-NXP Calibration Adapter

OI-410-NXP Non-Explosion Proof
Sensor Calibration Adapter

UL,ULC,EX,ATEX Certification Logos

Check literature for Certification Listings
or contact us for system configurations


Call for pricing and availability of calibration accessories

Calibration Gas and Accessories

OI-410 Calibrator Attachment Cup for Sensor Calibration, Explosion Proof
OI-410-NXP Calibrator Attachment Cup for Sensor Calibration, Non-Explosion Proof Systems
OI-550-R Gas Flow Regulator - 0.25 LPM
OI-556-R-0.50LPM-SS Stainless Steel Regulator - Gas 0.50 LPM
OI-2100-REG Manual Regulator; for Non-Dock Use with OI-2100 or OI-2400 Personal Monitors
OI-550-H2S-25-N H2S (Hydrogen Sulfide), 25 PPM, N2 (Nitrogen) Balance, 58L
OI-550-H2S-25-A H2S (Hydrogen Sulfide), 25 PPM, Air Balance, 58L
OI-551 CH4 (Methane), 50% LEL, Air Balance, 105L
OI-555-50-A CO (Carbon Monoxide), 50 PPM, Air Balance, 105L
OI-557-100 NH3 (Ammonia), 100 PPM, Air Balance, 58L
OI-558 CO2 (Carbon Dioxide), 5%, N2 (Nitrogen) Balance, 105L
OI-559 CL2 (Chlorine), 5 PPM, N2 (Nitrogen) Balance, 58L
OI-560-20-A SO2 (Sulfur Dioxide), 20 PPM, Air Balance, 58L
Other gases available, call for information

  Otis Instruments Sensor Assembly Replacement Sensors

Part # Description Range Resolution
OI-254-O2 O2, Oxygen 0 - 25% vol 0.1%
± 2%
OI-2018-SB-CB2 LEL, Combustible Gas
(Catalytic Bead) (OI-6000 only)
0 - 100% LEL 1.0% Increments
OI-140-IR-LEL LEL, Combustible Gas (Infrared)
(OI_6000 only)
0 - 100% LEL 1.0% Increments
± 2%
OI-254-CO CO, Carbon Monoxide 0 - 1000 ppm 0.1 to 10 ppm, 1 ppm thereafter
± 2%
OI-140-IR-CO2 CO2, Carbon Dioxide
(OI-6000 only)
0 - 5% vol 0.1 ppm
± 2%
OI-254-H2S H2S,  Hydrogen Sulfide 0 - 100 ppm 0.1 to 10 ppm, 1 ppm thereafter
± 2%
OI-254-H2S-2K H2S, Hydrogen Sulfide (Ext.Temp) 0 - 2000 ppm 0.1 to 10 ppm, 1 ppm thereafter
± 2%
OI-254-NH3 NH3, Ammonia 0 - 100 ppm 0.1 to 10 ppm, 1 ppm thereafter
± 5%
OI-254-NH3A-N NH3, Ammonia (Ext) 0 - 1000 ppm 0.1 to 10 ppm, 1 ppm thereafter
± 5%
OI-254-Cl2 Cl2, Chlorine 0 - 10 ppm 0.1 ppm
± 5%
OI-254-F2 F2, Florine (Call for availability) 0-1 ppm 0.01 ppm
± 5%
OI-254-CH2O CH2O, Formaldeyde 0-10 ppm 0.01 ppm
± 2%
OI-254-H2 H2, Hydrogen 0- 4% vol 0.1 ppm
± 10%
OI-254-HCL-M HCL, Hydrogen Chloride 0- 100 ppm 0.1 ppm
± 5%
OI-254-HCN-2 HCN, Hydrogen Cyanide 0- 100 ppm 0.1 ppm
± 5%
OI-254-HF HF, Hydrogen Floride 0 - 10 ppm 0.1 ppm
± 10%
OI-254-NO2-N NO2, Nitrogen Dioxide 0-50 ppm 0.1 ppm
± 5%
OI-254-O3 O3, Ozone 0-100 ppm .1 to 10 ppm, 1 ppm thereafter
± 2%
OI-254-SO2 SO2, Sulfur Dioxide 0 - 20 ppm .1 to 10 ppm, 1 ppm thereafter
± 2%
OI-254-PH3-5-S PH3, Phosphine 0 - 5 ppm 0.1 ppm
± 2%
OI-PID-A1 PID, Photo Ionization Detector for volatile organic compounds (VOCs) 0-2000 ppm 0.1 to 10 ppm, 1 ppm thereafter
± 5%
OI-254-AH PID, Photo Ionization Detector for volatile organic compounds (VOCs)

0-50 ppm

0.1 to 10 ppm, 1 ppm thereafter
± 3%

Other gases and ranges available
. Contact us for additional information

NOTE: If sensors are mounted in a potentially explosive environment, sensors must be connected to the base unit following NEC guidelines for hazardous locations.


WARNING! Otis Instruments equipment should only be used in conjunction with the manufacturer's instructions.
Failure to follow such instructions could result in serious injury or fatalities.


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Brandt Instruments, Inc. 
    18568 Oak Grove Parkway 
    Prairieville, LA  70769 
Phone: 225-673-6776
    Fax: 225-673-6725

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