System Sensor COSMOD2W - i4 Interface Module Reviews

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We Do Not Recommend
Submitted on 01/21/2020 Alarm Grid

The System Sensor COSMOD2W i4 Interface Module is the required hub used with System Sensor COSMO-2W Hardwired Combination Smoke and CO Detectors. Even though these are 2-wire devices, they are not used with a designated "reset zone" on a wired panel. Instead, these are configured with a standard hardwired zone, similarly to how a 4-wire smoke detector would be set up. The difference here is that this interface module is absolutely required. And the interface module is known for being extremely difficult and tedious to set up and configure. On top of that, you must also add a reset relay and a CO trigger relay for this set up to work. But on the positive side, the System Sensor COSMO devices are the only wired combination smoke and CO detectors used directly with security systems that we know about. And also, they offer one-go-all-go, which is a fantastic life-safety feature. Still, we don't recommend using these devices simply because they are very complicated for a DIY user to set up, and there are better options readily available. For that reason, we only give the System Sensor COSMOD2W i4 Interface Module a 2-Star rating.

There are some positive aspects regarding the System Sensor COSMOD2W i4 Interface Module. It allows the use of a combined smoke detector and CO detector into one device. The sensor can be used with any hardwired zone, which adds some nice versatility. We also really appreciate the fact that this sensor supports one-go-all-go. When we discuss one-go-all-go, we mean that when one life-safety sensor on the network activates, all of the other interconnected life-safety sensors on the same network will also activate. This can be very important for ensuring that everyone in the building is alerted to the emergency.

But the downsides to the System Sensor COSMOD2W are glaring. This module is extremely difficult and tedious to set up. Most DIY users will not want to take on this challenge. You must also add a reset relay and a CO trigger relay. We almost always advise users to instead go with a setup involving 2-wire smoke detectors and 4-wire carbon monoxide sensors. This will require using separate system zones, but COSMOD2W requires this anyway. Overall, we do not recommend the System Sensor COSMOD2W. That is why it only gets 2 Stars from us.

Good: Combo Smoke/CO Sensor, Use at Any Wired Zone, One-Go-All-Go

Bad: Difficult to Set Up, Requires Reset Relay & CO Trigger Relay

Bottom Line: 2 Stars