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