2GIG SMKT3-345 vs Honeywell 5808W3

The 2GIG SMKT3-345 and the Honeywell 5808W3 are both wireless smoke and heat detectors. Both devices operate at the 345 MHz, and both offer smoke, heat and freeze detection. However, these devices are somewhat different in terms of their compatibility with alarm systems.

2gig smkt3 345 wireless smoke heat and freeze detectorHoneywell 5808w3 wireless smoke and heat detector

Both of these devices provide similar functionality. They are both life-safety sensors that will alert others to the presence of smoke, heat and unusually low temperatures inside a building. Both devices are great for detecting fires and for sensing low temperatures caused by a broken HVAC unit that could cause the pipes to freeze.

However, there are also some key differences between these devices. Even though they both operate at the 345 MHz frequency, they are not compatible with the same alarm systems. The 2GIG SMKT3-345 will work with both the 2GIG GC3 and GC2, as well as the Honeywell Lyric Controller (with the MR3 Firmware Update). Meanwhile, the Honeywell 5808W3 will interface with all of these systems, as well as the Honeywell LYNX Touch Systems and the Honeywell VISTA Systems (with an added wireless receiver).

The other major difference between these two devices involves their Loop Numbers. For the 5808W3, only two different Loop Numbers are used. One is used for smoke and heat detection, while the other is used for freeze detection. In other words, only two zones are needed to get the full functionality out of the device. But for the SMKT3-345, there are separate Loops for both smoke and heat detection. There is also a third Loop for freeze detection. Therefore, three separate wireless zones are needed to get the full functionality out of a SMKT3-345.

Additionally, the SMKT3-345 supports both fixed temperature detection and rate of rise detection. But the 5808W3 only supports fixed temperature detection. The 5808W3 will activate immediately upon sensing a temperature of at least 135 degrees Fahrenheit. But the SMKT3-345 will activate after sensing a continuous temperature of 125 degrees Fahrenheit or higher for at least three minutes. It must do this three times before the heat detector loop transmits an alarm. This means it can take up to nine minutes for a fixed temperature heat alarm to be activated. Furthermore, only the SMKT3-345 will activate upon sensing a rate of rise temperature increase of 10 degrees Fahrenheit in a single minute.

The SMKT3-345 has a low temperature threshold of 40 degrees Fahrenheit. Sensing for this feature works in the same way as fixed temperature heat detection. The temperature must drop to 40 degrees or below for three minutes, and it must sample the temperature at or below this threshold three times before the low temperature alarm will be transmitted. Alternatively, the low temperature threshold for the 5808W3 is 41 degrees Fahrenheit. This detector samples the low temperature sensor every 10 seconds. As soon as it senses a temperature of 41 degrees or below it activates the low temperature alarm, but it will hold onto this message until the next RF supervision check-in signal is sent. The low temperature alarm will be piggy-backed onto the supervision signal, and the alarm will be activated.

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