Gas detection since 1983, wireless gas detection since 2005

3-Relay option now available

2.4GHz radio option now available

The Relayer OI-WF753 is a wireless relay/alarm system specifically designed for use in conjunction with the Otis Instruments, Inc. WireFree OI-WF690 Sensor Assembly and WireFree OI-WF784 ProSafe Gas Monitor—completing a reliable WireFree System that began emerging in 2005. The Relayer OI-WF753 can monitor up to 16 sensors. The ability to mount the device near the entrance of a site allows the technician to immediately determine if it is safe to enter the site, making this device incredibly useful in any environment hosting hazardous gas. The Relayer OI-WF753 can be mounted as a traditional or self-contained system that requires 12-24 Volts DC or 110 Volts AC. The Relayer OI-WF753 receives transmissions from WireFree sensors via an on-board 7 mile line-of-site 900mhz radio. The Relayer OI-WF753 features non-intrusive, magnetically-triggered setup. With all adjustments made at the alarm board, one-man non-intrusive setup is quick, easy, and allows the device to remain Class I, Division 1 explosion-proof certified while in the field. These key features—and more—make the WireFree Relayer OI-WF753 a reliable and convenient tool that is incredibly useful in any environment hosting hazardous gas. For a complete list of spare/replacement parts for this product, click on the "Spare Parts" link located under OI-WF752 on the left sidebar of this page.