Brandt Instruments Representing Otis Instruments Fixed Gas Detection System, OI-7500 WireFree 32-Channel Explosion-Proof Monitor for Fixed Gas Detection System
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Otis Instruments OI-7500
WireFree™ 32-Channel Explosion Proof Monitor
Fixed Point Remote Gas Detection Systems

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Otis Instruments OI-7500 WireFree Explosion Proof 32-Channel Monitor

OI-7500 Explosion-Proof WireFree™
32-Channel Monitor, DC Power, 3 Relays
with AC Power Option

The OI-7500 is a self contained WireFree explosion-proof 32-Channel self contained monitor designed for use in conjunction with Otis Instruments Gen II WireFree Remote Sensor Assemblies.  The OI-7500 features 3 relays, and can monitor up to 32 WireFree sensors.

   Explosion and weather proof enclosure
    Glass lid for viewing the display
    Monitors up to 32 individual WireFree sensor assemblies
   Continuous scanning to monitor all channels
    Non-intrusive setup with MENU, ADD and SUB buttons
    Ability for each relay to be latched or non-latched
   Ability to disable alarm relays
    AC or DC power-in option
   Easy radio interface with Otis remote WireFree sensors 
    Rapid response and clearing time

   Radio Options:
               Gen II radio 900 MHz, 200mW
               (2.4 GHz ISM, 100mW available for international use)

                                                                                     

OI-7500-X-XP-X WireFree 32-Channel Gas Monitor
Explosion-Proof & Battery Power Option
Technical Specifications

Enclosure
 Aluminum Device Enclosure
Size & Weight 8 " x 8" x 4" (Max. Dimensions w/ Attachments) | 12.8 Lbs
Display Graphical LCD168x64 pixel resolution, sunlight readable (transflective), LED back-light
Channels

32 Channels | Up to 32 GEN II WireFree (Digital) Sensor Inputs
Customizable Settings

3 Individually-Configurable Alarm Set-Points Per Channel
Option to Disable Alarm Relays Latching and
Non-Latching Relay Settings

Relays 3 Dry-Contact Relays with 4 Amp Replaceable Fuses, Fault Terminal
Networks

52 Networks (GEN II 900 MHz Radio)
78 Networks (GEN II 2.4 GHz Radio)
255 Addresses per Network

Tamb Temperature Range -30° F to 70° C | -40°F to +158°F
RF Connection External N-Female Radio Frequency (RF) Connector
Power Supply 3.13A (75W), 85/264V AC to 24V DC (Optional)
Current Draw 275 mA Maximum
Certifications & Approvals Class I, Groups B, C, and D
Class II, Groups E, F, and G
ABS Design
WireFree Radio Options GEN II 900 MHz Radio or GEN II 2.4 GHz Radio (Overseas Use)
Compatibility GEN II WireFree Sensors (OI-6000, OI-6900, OI-6940)
GEN II WireFree Transmitters (OI-5900, OI-5950)
Warranty

Hardware: One year (limited)

Part Number Formula

OI-7500-[Power]-XP-[Radio]
OI-7500-X-XP-X

Otis WireFree Logo

Otis OI-7500 Data Sheet

   OI-7500 Manual

For additional accessories & options:  Accessories

CSA Certification Icon
ATEX Certification Icon
Otis Instruments OI-7500 WireFree 32-Channel Explosion Proof Monitor Diagram

OI-7500 WireFree 32-Channel Explosion Proof Monitor Diagram

Otis Instruments Replacement Gas Sensors
For Wired or WireFree™ Remote Sensor Assemblies

Part # Description Range Resolution
Accuracy
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
±1%
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-A 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-PH3-5-5 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%


Note: Other gases and ranges available. Contact us for additional information

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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 
1-800-337-6291  
Phone: 225-673-6776
    Fax: 225-673-6725 

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