Otis Instruments OI-7543-X-X-I Wireless Monitor

Availability: In stock
Product TypeGas Monitor
Power TypeWired Powered
Operating Voltage12V to 35V DC or 120V AC
Current Draw275 mA Maximum
Power Supply3.13A (75W), 85/264V AC to 24V DC (Optional)
ProtectionPower Electromagnetic Interference (EMI) Filter
Product CompatibilityAny Otis GEN II WireFree Sensor
Display Screen128x64 Resolution Graphical LCD Screen
Transflective (Sunlight Readable) with LED Backlight,

3 Push-Buttons (MENU, ADD, and SUB),

3 Magnetic Non-Intrusive Switches

Tamb Temperature Range-40°C to +70°C
WireFree (Digital) InputUp to 6 GEN II WireFree Sensor Inputs

RS-485 Modbus

Optional WirelessHART® Module (Disables RS-485 Modbus Output)


3 Dry-Contact Relays with 4 Amp Replaceable Fuses

Wet Contact Fault Terminal,

3 Individually-Configurable Alarm Set-Points per Channel

Latching and Non-Latching Relay Settings per Channel

WireFree Radio Options

GEN II 900 MHz Radio

GEN II 2.4 GHz Radio


52 Networks (GEN II 900 MHz Radio)

78 Networks (GEN II 2.4 GHz Radio)

255 Addresses per Network

Enclosure MaterialNEMA 4X Fiberglass Enclosure with Clear Window
Product Dimensions8 in. L x 8 in. W x 4 in. H (Max. Dimensions with Attachments)
Total Weight12.8 lbs.
Hardware Warranty1-Year, Limited
Optional WirelessHART® KitOI-HART-KIT - WirelessHART® Module with 2.4 GHz External Antenna
Part Number Formula01-7543-6-[Radio]-[Power]-[Enclosure]


The Otis Instruments 0I-7543 Six Channel Gas Monitor with 3 Dry Contact Relays can monitor up to 6 individual GEN II WireFree Gas Detectors and Transmitters. RS-485 Modbus output allows for data communication to a PLC or other system monitoring device. Available with an optional Wireless HART® module that allows the received sensor readings to be viewable on a Wireless HART® network.


  • 6 Channel Monitor - Can Monitor Up to 6 GEN II WireFree Sensors
  • 12 to 35 VD Operating Voltage with an Optional AC Power Supply
  • Operating Temperature Range of -40°C to +70°C
  • Graphical LCD with LED Backlight
  • Radio Options: GEN II 900 MHz or GEN II 2.4 GHz Radio Standard
  • 3 Individually Configurable Alarm Set-Points: Three Red LED ALARM Indicators; 3 Dry-Contact Relays (4 Amps Maximum per Relay)
  • Status Indicator for Fault Conditions: Amber LED Indicator for System Faults
  • Output Options: Wet Contact DC Fault Terminal, Relay 3 Can Optionally Be Configured as a Fault Relay, RS-485 Modbus or Optional WirelessHART®
  • NEMA 4X Standard Fiberglass Enclosure with Clear Lid
  • 1-Year Limited Hardware Warranty

​Please refer to datasheet for more information