OI-7420 ProSafe 4x2


The Otis Instruments, Inc. GenII ProSafe 4×22 Model OI-7420 is a two channel gas monitor that functions as a transmission controller.  The OI-7420 monitors toxic, combustible and oxygen gas levels in ambient air by receiving and displaying 4-20mA signals from up to two wired sensor assemblies.

The OI-7420 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-7420 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.

The ability to display data and activate alarms in relation to readings sent from on-site sensors make the OI-7420 a truly phenomenal product in the safety realm of the gas industry.

Request additional information regarding this product:

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

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

Input Signal: 4-20mA

Output (Alarm Power):

• +12-35 Volts DC (fault indicator)

• RS-485

Current Draw: 250mA at 12 Volts DC

Channels: Two

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


• Power EMI filter, surge suppression

• 4-20mA and RS-485 surge suppression


• Graphical LCD (160×104)

• Transflective

• Sunlight readable

• LED backlight


• 8” x 8” x 4” Stahlin fiberglass with clear window

• Wall mount

• NEMA 4 certified Monitor Specifications

Warranty: One year (limited)

Power: AC, DC

Channels: 2

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