OI-7420 ProSafe 4×2


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.


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Operating Voltage: 12-35 Volts DC or 120/240 Volts AC

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)


OI-7420 Data Sheet

OI-7420 Operation Manual


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