OI-7440 ProSafe 4x2

OI-7440 Controller - Otis Instruments

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: 12V to 35V DC or 120V AC

Tamb Temperature Range: -40 C to +70 C

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)

Power: AC, DC

Channels: 4

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