System Sensor 2W-B

2-Wire Smoke Detector

System sensor 2w b 2 wire smoke detector

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The System Sensor 2W-B is a 2-wire smoke detector and a member of System Sensor’s i3 Series of photoelectric smoke detectors. The 2W-B sm...
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The System Sensor 2W-B is a 2-wire smoke detector and a member of System Sensor’s i3 Series of photoelectric smoke detectors. The 2W-B smoke detector works with most Honeywell alarm control panels including the VISTA-20P and VISTA-21iP as System Sensor is a subsidiary of Honeywell. However, you can also use the 2W-B smoke detector with other alarm control panels, but you should verify compatibility with the manufacturer of the alarm control panel first.

All System Sensor i3 Series smoke detectors are designed for easy installation, advanced detection and fast inspection. The 2W-B smoke detector consists of a mounting base that can be mounted on a single gang box, a three and a half or four inch octagonal box or a four inch square box with a plaster ring. For convenience, the 2W-B mounting base can also be directly mounted to the ceiling using drywall fasteners. Once the mounting base is installed, the 2W-B smoke detector attaches to the base by simply inserting the head and turning it clockwise until it locks in place. When performing maintenance on your smoke detector, simply turn the 2W-B head counter clockwise to remove it from the base. You can also remove the detector cover and the sensing chamber for convenient smoke detector cleaning.

The System Sensor 2W-B smoke detector has a sensing chamber that that will become dirty with dust over time. With less intelligent smoke detectors, a dirty photoelectric chamber will results in false alarms. The i3 Series 2W-B uses drift compensation technology and smoothing algorithms which prevent the smoke detector from becoming too sensitive as dust accumulates. This feature ensures that your security system will not experience nuisance false alarms.

While the drift compensation and smoothing algorithms make the 2W-B more advanced than other conventional smoke detectors, it will eventually need to be cleaned. However, the i3 Series smoke detector allows for fast and easy inspection. There is a red and green LED on the head of the 2W-B smoke detector. When the smoke detector is normal the green LED will blink every five seconds. When the sensing chamber gets too dirty and the 2W-B is no longer calibrated to the proper sensitivity, the smoke detector will alert you with a red LED that blinks every five seconds so that you can perform the necessary maintenance. Whenever an alarm is detected by the System Sensor 2W-B, the smoke detector will show a solid red LED.

When using the System Sensor 2W-B two wire smoke detector with a VISTA-20P or VISTA-21iP alarm control panel, you should wire the smoke detector to zone one. You can use up to sixteen 2W-B smoke detectors on the zone one fire loop. Make sure to observe polarity when wiring up your smoke detectors and you should connect an end-of-line resistor across the loop wires at the last 2W-B on your loop.


Thanks for your insight and expertise!
Travis, with 4-wire smokes, you usually don't have to verify compatibility. As long as they operate at 12 Volts DC, they should work. It appears that these two models are very similar in their features (neither has a sounder, both operate at 12 or 24 Volts) so this should be a satisfactory replacement.
I have a Vista 6150 15P Control Panel and an old System Sensor 2312/24TB 4 wire Smoke/heat detector. I would like to replace it with similar 4 wire detector like the 4WT-B detector and wanted to check if they are compatible?
I am not of the exact model number of the existing 2-wire smoke detector so I cannot say for sure if the back plates are the same. If they are not just take a photo of the connections and land what is connected to the positive connection the new plates positive and same with the negative. It should be straightforward if you do not need to wire the back plate. I recommend powering down the system and placing your system on test mode if monitored before swapping in the new smoke.
It should connect the same exact way. Leave everything as is at the panel and simply replace the smoke detector itself.
Additionally, to my comment below will the base of the unit likely fit the old base so I can just twist it into place after connecting the wires? I have a DSC alarm system that my current System Sensors are connected to and would I need to do anything special when I replace the old with the new other then reset the system?
I have an old System Sensor 2 wire photoelectric smoke alarm (hardwired) that is about 17 years old and has finally gone out - trying to figure out if this particular unit will work seamlessly as a replacement for my existing alarm - there is a connection to the back of the alarm and wonder if I can just hook up the new alarm the same away the old alarm is connected and have it work?
Unfortunately we do not support fire panels like the 32FB. However zones 1 and 2 can support 16 on each zone. Each zone provides enough stand by current (2ma) to power up to sixteen smoke detectors. Each zone provides only enough alarm current (20ma) to power one smoke in alarmed state. system is the site link for a current list of all UL listed compatible smoke detectors. The 2W-B should work zones 1 and 2 since they are designed for system sensor 2-wire devices.
CAN 2W-B be used on VISTA32FB
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