Smoke Detectors

About

2-wire and 4-wire smoke detector varieties can be used with any hardwired alarm system. 2-wire smokes use just two wires for data and power and must all be chained on the same run. 4-wire smokes use separate two-wire pairs for power and zone data and can be separated into their own zones. All of the hard-wired alarm systems we sell can accept either 2-wire or 4-wire type smoke detectors, but there are a few things to keep in mind when making this decision: 1. Generally speaking, you are limited to a maximum of about 18 2-wire smokes per system (the exact amount is determined by loop resistance). Whereas the 4-wire type allows you to have many times this amount, only limited by the current available from the board or additional power supplies. 2. The 2-wire type offers full supervision of the line between the panel and smoke, whereas the 4-wire type only supervises the detection circuit by default. 2-wire type smokes are the latest technology; however, the 4-wire type are the universal standard and should be used when in doubt. There are different styles of 2-wire and 4-wire smoke detectors. If you need a simple smoke detector, then we carry those in the 2W-B and 4W-B models. There are also the 2WT-B and 4WT-B models, which are a combination of smoke and heat detectors. Then there are the 2WTA-B and 4WTA-B models, which are detectors that combine smoke and heat as well as a built-in sounder for local notification of an emergency. We also carry the System Sensor COSMO2W and COSMO4W model smoke detector, combined with a carbon monoxide sensor. These smoke / CO combination units use an intermediary module that goes between the detector and the panel, called the COSMOD2W and COSMOD4W , respectively. The modules connect to the system to separate the smoke and CO zones, and the COSMO units are run in a chain from the module. The COSMOD modules can also operate the 2WT-B or 4WT-B model smokes, allowing you to chain a variety of coverage on one smoke run. Not only do we carr