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

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Otis Instruments OI-7400 ProSafe
Wired Remote Sensor Controller Systems

Fixed Gas Detection System
2-32 Channel Controller Monitor

home otis instruments fixed point detectors OI-7400 Series Otis Instruments Multi-Channel Wired Sensor Controller System


OI-7420 2-Channel Controller-Monitor with Lights & Horn

2 Channel Controller- Monitor
Configured with Light & Horn




Otis Instruments 1-12 Channel Controller Monitor

1 to 12 Channel Controller-Monitor



Otis Instrumets OI-7432 32-Channel Controller Monitor for Remote Sensor Heads

32 Channel Modbus Controller - Monitor


Otis Instruments OI-7400 ProSafe series wired controller systems are available as 2 to 32 channel controllers as part of a fixed gas detection system.  OI-7400 systems are designed to provide continuous monitoring for a variety of common atmospheric hazards including:

Ammonia (NH3) Formaldehyde (CH2O) Oxygen (O2)
Carbon monoxide (CO) Hydrogen Cyanide (HCN) Ozone (O2)
Chlorine (Cl2) Hydrogen Fluoride (HF) Sulfur dioxide (SO2)
Combustible gas (LEL) Hydrogen Sulfide (H2S) Phosphine (PH3)
Fluorine (F2) Nitrogen Dioxide (NO2) PID sensor for VOC detection & many others

OI-7400 controller systems are avalailable for a variety of of applications. The OI-7420 with two channels can be used in smaller locations such as warehouses and laboratories.  The OI-7432 with 32 channels and a Modbus interface is perfect for installations such as large parking garages where the Modbus interface saves money in wiring the remote sensor head assemblies.

OI-7420 ProSafe 4x2 Wired (4-20mA) 2 channels, 4 dry contacts
OI-7440 ProSafe 4x4 Wired (4-20mA) 1-4 channels
OI-7480 ProSafe 4x8 Wired (4-20mA) 8 or 12 channels
OI-7432 ProSafe 4x32 Wired (ModBus Interface only) 32-channels

The compatible OI-6000 wired sensor assemblies are available with Electro-Chemical (EC), Catalytic Bead, PID or Infrared (IR) sensor elements.  Sensors assemblies are linked by wire to the controller.  Best of all, the the OI-7400 offers the flexibility to choose single, twin color or tower of high-intensity strobes, TriLite, integrated 102 db audio alarm, real time LCD readout…..all in a sleek, tough NEMA 4X housing.

The ability to display data and activate alarms in relation to readings sent from on-site sensors make the OI-7400 controllers an efficient way to monitor toxic hazards.  With four dry contact relays, signals can also be routed to and from other remote sensors such as temperature, pressure, tank levels, motors and fans.


OI-7400 ProSafe Wired Controller Systems
General Technical Specifications

Note: Specifications below are common to all 7400 controllers
For specific models download the literature using the links below.


Stahlin fiberglass with clear window, wall mount

NEMA 4 enclosures are intended for indoor and outdoor use primarily to provide a degree of protection against corrosion, windblown dust and rain, splashing water, and hose-directed water; and to be undamaged by the formation of ice on the enclosure.

Dimensions OI-7420:  8" x 8" x 4"
OI-7440: 10" x 8" x 6"
OI-7480: 12" x 10" x 6"
OI-7432: 10" x 8" x 6"
Display Graphical LCD, sunlight readable
LED back-light, 160 x 104 resolution
Temperature Range (-76F to +274F) (-60C to +134C)
Interface Three push buttons (MENU, ADD, SUB)
Sensor Types Electro-chemical, catalytic bead, PID or Infrared.
Operating Voltage 110/220 VAC or 12-35 VDC
Current Draw 7420: 250mA at 12 VDC
7440: 250mA at 12 VDC
7480: 250mA at 12 VDC (monitor only); 3 Watts max
7432: 250 mA at 24 VDC,
Input Signal 4-20mA
(Internal Alarm Power)

7420: 12-35 VDC (Fault Indicator) RS-485 Modbus
7440: 12-35 VDC (Fault Indicator) RS-485 Modbus with optional real-time monitoring software
7480: 4-20 mA (Fault Indicator), RS-485 Modbus with optional real-time monitoring software
7032: RS-485 Modbus only

Relays Four "dry contact" (Form C) 5 Amp relays with 4 Amp fuses that are full-scale adjustable
Protection Power EMI filter, surge suppression, RS-485 surge suppression
Warranty Hardware: One year (Limited)

Each OI-7400 includes the controller with all standard alarms, relays and electronics installed in a non explosion-proof fiberglass housing. Custom configurations are available.

Note: Cable, conduit, wire and other components necessary to connect remotely located sensors with the controller are not included. Order any cable separately from Otis or an electrical supply house.


    Otis OI-7420 ProSafe Controller Brochure    Manual

   Otis OI-7440 ProSafe Controller Brochure    Manual

   Otis OI-7480 ProSafe Controller Brochure    Manual

   Otis OI-7432 ProSafe Controller Brochure    Manual

For additional accessories & options:  Accessories


Otis Instruments OI-7432 ProSafe Wired Controller Monitor Panel Front Diagram

OI-7432 ProSafe Wired Controller-Monitor
Typical Example of the Panel Front of OI-7400 Series

  Otis Instruments OI-6000 Sensor Assembly Sensors

Part # Description Range Resolution
OI-254-O2 O2, Oxygen 0 - 25% 0.1%
± 2%
OI-120-NP-17SHM LEL, Combustible Gas
(Catalytic Bead) (OI-6000 only)
0 - 100% LEL 1.0% Increments
OI-140-NP-IR-LEL LEL, Combustible Gas (Infrared)
(OI_6000 only)
0 - 100% LEL 1.0% Increments
± 2%
OI-254-CO CO, Carbon Monoxide 0 - 999 ppm 0.1 to 10 ppm, 1 ppm thereafter
± 2%
OI-140-IR-CO2 CO2, Carbon Dioxide
(OI-6000 only)
0 - 5% 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 - 100 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 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 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% 0.1 ppm
± 10%
OI-254-HCl HCN, Hydrogen Chloride 0- 30 ppm 0.1 ppm
± 5%
OI-254-HCN HCN, Hydrogen Cyanide 0- 30 ppm 0.1 ppm
± 5%
OI-254-HF HF, Hydrogen Floride 0 - 10 ppm 0.1 ppm
± 10%
OI-254-NO2 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 - 20ppm .1 to 10 ppm, 1 ppm thereafter
± 2%
OI-254-PH3 PH3, Phosphine 0 - 20 ppm 0.1 ppm
± 2%
OI-254-PID-A1 PID, Photo Ionization Detector for volatile organic compounds (VOCs) (OI-6000 only) 10, 20 or 50 ppm 0.1 to 10 ppm, 1 ppm thereafter
± 5%
OI-254-AH PID, Photo Ionization Detector for volatile organic compounds (VOCs) (OI-6000 only)

1000 or 2000 ppm

0.1 to 10 ppm, 1 ppm thereafter
± 3%
Note: Other gases and ranges available. Contact us for additional information


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

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