System Sensor 4WITAR-B — i3 Series four-wire photoelectric smoke detector with an isolated 135°F fixed thermal sensor, 85 dBA sounder and Form C relay, base included.
Isolated is the operative word. Smoke at the optical chamber sounds the local horn and self-resets without signalling an alarm at the panel; only the fixed-temperature heat sensor raises a general alarm and transfers the relay. That split is why the model exists.
- Four-wire, 12/24 V over 10 to 35 VDC; 50 µA standby, 50 mA alarm
- Photoelectric sensitivity 2.5% per foot, with drift compensation
- Thermal element 135°F (57.2°C) fixed and restorable — not rate of rise
- Form C contacts 2 A at 30 V AC/DC; alarm contacts 0.5 A at 30 V AC/DC
- 85 dBA ANSI S3.41 temporal tone, synchronised by the RRS-MOD
- 5.3" diameter × 2.0" high with base; freeze trouble at 41°F
One four-wire relay base accepts the 4WTR-B, 4WTAR-B and 4WITAR-B heads and no others, so the base is shared but the heads are not. The 4WTAR-B has the same sounder and relay but an unisolated thermal sensor, so smoke alone alarms the panel; 4WTA-B is sounder only, 4WTR-B relay only.
Documents
FAQ
What does "isolated thermal" mean on the 4WITAR-B?
Smoke at the detector initiates a local alarm only, while the thermal sensor initiates a general alarm.
Is a mounting base included?
Yes. Each i3 Series detector is supplied with a mounting base. Heads and bases are keyed, so make sure the head is mounted to the correct base.
How do I make all sounders on a loop sound together?
Use the System Sensor RRS-MOD reversing relay. It reverses the supply polarity so all i3 sounder detectors on the loop sound, and it synchronizes them.
What wire size do the base terminals accept?
The screw terminals in the mounting base accept 14 to 22 gauge wire.
