OI-7543-6 Non-Explosion Proof Monitor with Three Relays and RS-485 Modbus Output

OI-7543 Controller - Otis Instruments

The Otis Instruments OI-7543-6 six channel Gas Monitor with 3 Dry Contact Relays can monitor up to 6 individual GEN II WireFree Gas Detectors and Transmitters. An RS-485 Modbus output allows for data communication to a PLC or other system monitoring device. The OI-7543-6 is available with an optional WirelessHART® module that allows the received sensor readings to be viewable on a WirelessHART® network. Standard DC or optional AC power options make this monitor a great addition to your gas detection network.

OI-7543-6-[Radio Frequency]-[Power Supply]-I

Request additional information regarding this product:

Product Type: Gas Monitor

Power Type: Wired Power Operating Voltage 12V to 35V DC or 120V AC

Current Draw: 275 mA Maximum

Power Supply: 3.13A (75W), 85/264V AC to 24V DC (Optional)

Protection: Power Electromagnetic Interference (EMI) Filter

Display Screen:

• 128×64 Resolution Graphical LCD Screen

• Transflective (Sunlight Readable) with LED Backlight


• 3 Push-Buttons (MENU, ADD, and SUB)

• 3 Magnetic Non-Intrusive Switches

Output: RS-485 Modbus Optional WirelessHART® Module (disables RS-485 Modbus Output)

TambTemperature Range: -30°C to +70°C

WireFree (Digital) Input: Up to 6 WireFree Sensor Inputs


• 3 Dry-Contact Relays with 4 Amp Replaceable Fuses

• Wet Contact Fault Terminal 3 Individually-Configurable Alarm Set-Points/Channel

• Latching and Non-Latching Relay Settings/Channel

Product Compatibility:

• GEN II WireFree Sensors and Transmitters

WireFree Radio Options: GEN II 900 MHz Radio OR GEN II 2.4 GHz

Radio Networks:

• 52 Networks (GEN II 900 MHz Radio)

• 78 Networks (GEN II 2.4 GHz Radio)

• 255 Addresses per Network

Enclosure Material: Fiberglass Enclosure w/ Clear Window

Product Dimensions: 8 in. L x 8 in. W x 4 in. H (Max. Dimensions w/ Attachments)

Total Weight: 12.8 lbs.

Hardware Warranty: 1-Year, Limited

Optional WirelessHART® Kit: OI-HART-KIT — WirelessHART® Module with 2.4 GHz external antenna

Power: AC, DC

Radio Configuration: Gen II 900 MHz Radio, Gen II 2.4 GHz Radio

Please fill out the form below to have a sales representative contact you.

How can we help?

Feel free to ask a question about the specific product.