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What are you using for a Z-Wave Dry Contact Sensor?

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  • #16
    Originally posted by Miamijerry View Post

    DWZWAVE2.5-ECO have terminal board that accepts an external switch.
    I had the same question as the OP. I have a need to immediately tell if and when power is lost and regained. (Aside: I have other means to tell when power is lost. For example apcupsd, which relies on polling, so it isn't instantaneous. I also have APC with APC Network cards, which aren't all that easy to integrate into HomeSeer since instantaneous notification entails SNMP or HomeSeer PC being connected directly to the APC UPS). So, I got this inexpensive device: .
    This device has NC or NO output which changes when AC power is lost or regained. Now, I just need to connect its output terminals (NC or NO and COM) to a Z-Wave device.
    I have many MimoLites which I use for doors and motion sensor devices' output (I prefer non-battery operated devices when possible). However, the MimoLites can change state when power is lost or regained and they require power, so they don't quite meet my use-case (of telling when power is lost). I need a battery powered device. I used to use Z-Wave door/window sensors that supported wired input, but these weren't Z-Wave Plus. I would prefer Z-Wave Plus. I looked at the manual for DWZWAVE2.5-ECO ( It doesn't indicate where an external switch can be connected?

    EDIT: also, some of these door/window sensors can detect when a relay is tripped via the relay's magnet, but at this time, I am not sure if the aforementioned AC relay ( can do this.

    EDIT 2: Ah... I found a picture that someone had posted of the internals of the Ecolink sensor. Looks like the green screw terminals is what is used.


    • #17
      Not Z-Wave, but.... If you have a Zigbee controller (SmartThings, Hubitat, Conbee/deCONZ), then the Xiaomi water sensor is basically a normally open (NO) dry contact. The Xiaomi sensor has 2 screws on the back side that you can hook leads to for dry contact closure. The water sensor is waterproof and immersible, so outdoor deployment is possible. However the contacts should be covered with a silicon sealant to prevent false triggers from water contact.

      Click image for larger version

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      I have caught them on sale in the past for well under $15, so it's hard to beat the price. And battery life should be in the 3 - 5 year range.