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Model OI-715 Single Channel Rack Mount Gas Detection Controller

The Otis Instruments, Inc. Model OI-715 Single Channel Rack Mount Gas Detection Controller is specifically designed to monitor and display a 4 to 20mA signal transmitted from a sensor/amplifier assembly.
Model OI-704 four channel controller

The Otis Instruments, Inc. Model OI-704 four channel controller is a reliable and durable gas monitor designed to scan one to four channels and display a 4 to 20mA, or 0 to 5 Volt signal transmitted from a sensor/amplifier assembly.
ProSafe 4x4 Model OI-744

The Otis Instruments, Inc. ProSafe 4x4 Model OI-744 is a four channel gas monitor that functions as a transmission controller.
OI-761

OI-772

Permian II Model OI-792