OI-7432 ProSafe 4x32


The Otis Instruments, Inc. Gen II ProSafe 4×32 Model OI-7432 is a 32-channel gas monitor that functions as a transmission controller.

The OI-7432 monitors toxic, combustible and oxygen gas levels in ambient air by receiving and displaying RS-485 Modbus signals from up to 32 OI-6000 sensor assemblies. The OI-7432 features a 160×104 graphical LCD display and is equipped with four “dry contact” (Form C) 5 Amp alarm relays (with 4 Amp fuses) that are full-scale adjustable.

The OI-7432 operates with either 12-35 Volts DC or 110/240 Volts AC power-in and includes a Modbus output with optional real-time monitoring software.

Request additional information regarding this product:

Operating Voltage: 12V to 35V DC or 120V AC

Tamb Temperature Range: -40°C to +70°C

Channel Options: 32

Input Signal: RS-485 Modbus

Output (Int. Alm. Pwr):

• +12-35 VDC (Fault Indicator)

• RS-485 Modbus

Current Draw: 250 mA at 12 VDC


• Power EMI filter & surge protection

• 4-20mA & RS-485 surge protection


• Graphical LCD (160×104)

• Transflective, sunlight readable

• LED backlight

Relays: Four Dry-Contact (5 Amp) with 4 Amp fuses

Enclosure: Stahlin 10x8x6 fiberglass with clear window

Certifications: NEMA 4 (enclosure only)

Warranty: Hardware: One year (limited)

Power: AC, DC

Channels: 32

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