Otis Instruments OI-7530-X-X-A Wireless Monitor-Relayer

Availability: In stock
Product Type32 Channel Gas Relayer
Power TypeWireFree Power
Operating Voltage12V to 35V DC or 120V AC
Current Draw275 mA Maximum
Power Supply3.13A (75W), 85/264V AC to 24V DC (Optional)
RF ConnectionExternal N-Female Radio Frequency (RF) Connector
Customizable Settings

- 3 Individually-Configurable Alarm Set-Points Per Channel

- Option to Disable Alarm Relays

- Latching and Non-Latching Relay Settings

Display Screen

128x64 Resolution Graphical LCD Screen

- Transflective (Sunlight Readable) with LED Backlight

Interface3 Push-Buttons (MENU, ADD, and SUB)
Temperature Range-40°C to +70°C
WireFree (Digital) InputUp to 32 GEN II WireFree (Digital) Sensor Inputs

-3 Dry-Contact Relays with 4 Amp Replaceable Fuses

-Fault Terminal

ProtectionPower Electromagnetic Interference (EMI) Filter
WireFree Radio Options

- GEN II 900 MHz Radio

- GEN II 2.4 GHz Radio

Product Compatibility

- GEN II WireFree Sensors (01-6000, 01-6900, 01-6940)

- GEN II WireFree Transmitters (01-5900, 01-5950)


- 52 Networks (GEN II 900 MHz Radio)

- 78 Networks (GEN II 2.4 GHz Radio)

-255 Addresses per Network

Enclosure MaterialAluminum Device Enclosure
Product Dimensions8 in. L x 8 in. W x 4 in. H (Max. Dimensions with Attachments)
Total Weight12.8 lbs.
Hazardous Location Certifications and Approvals

- Class I, Groups B, C & D

- Class II, Groups E, F & G

Hardware Warranty1-Year, Limited
Part Number Formula

01-7530-[Radio]-[Power Supply]-A



The Otis Instruments OI-7530 Relayer is a 32-Channel Gas Alarm System with 3 Relays that can monitor up to 32 Wireless Gas Detectors simultaneously. Magnetic switches allow for non-intrusive calibration while in the field as well as full system setting and diagnostics. Housed in an explosion-proof enclosure for the safe and close-proximity installation of the monitor within hazardous locations.


  • 32 Channel WireFree Relayer
  • 12 to 35 VDC Operating Voltage with an Optional AC Power Supply
  • Operating Temperature Range of -40°C to +70°C
  • Graphical LCD with LED Backlight
  • 3 Push-Button Interface (ADD, MENU, SUB) with 3 Corresponding Magnetic, Non-Intrusive Switches
  • Output Options: Wet Contact DC Fault Terminal, Relay 3 Can Be Optionally Configured as a Fault Relay
  • RaN IT 2.4 GHEN II 900 MHZ Or
  • Aluminum Explosion-Proof Enclosure
  • 3 Individually Configurable Alarm with Class I, Division 1, Groups B, C & D Certifications Set-Points: Three Front Panel ALARMLED Indicators (Red): 3 Dry-Contact Relays (4 Amps Maximum per Relay)
  • 1-Year Limited Hardware Warranty

Please refer to datasheet for more information