OI-7440 ProSafe 4×2


The Otis Instruments, Inc. Gen II ProSafe 4×42 Model OI-7440 is a four channel gas monitor that functions as a transmission controller. The OI-7440 monitors toxic, combustible and oxygen gas levels in ambient air by receiving and displaying 4-20mA signals from up to four wired sensor assemblies.

The OI-7440 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-7440 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.

Part Number Formula: OI-7440-[Power Supply]-4


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Operating Voltage:

  • 12-35 Volts DC

  • 120/240 Volts AC

Channels: 4

Input signal:

  • 4-20mA

  • RS-485

Output (Alarm Pwr):

  • 12-35 Volts DC (Fault Indicator)

  • Rs-485 Modbus

Current Draw: 250mA at 12 Volts DC


  • Power EMI filter & surge protection

  • 4-20mA & RS-surge protection


  • 160×104 graphical LCD

  • Transflective, sunlight readable

  • LED backlight

Relays: Four dry-contact (5 Amp) with 4 Amp fuses

Gases: All that are supported by Otis sensor assemblies

Enclosure: Stahlin 10x8x6 fiberglass with clear window

Enclosure Mounting: Wall mount

Certifications: NEMA 4 (enclosure only)

Warranty: Hardware: One year (limited)


OI-7440 Data Sheet

OI-7440 Operation Manual


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