THE 4WTA-B IS A 4-WIRE, PHOTOELECTRIC I3 SMOKE DETECTOR WITH THERMAL SENSOR AND BUILT-IN SOUNDER.
4WTA-B System Sensor Photoelectric Smoke and Heat Detector / Sounder The model 4WTA-B System Sensor is a 4-wire photoelectric smoke detector. All models incorporate a state-of-the-art optical sensing chamber and an advanced microprocessor.
The microprocessor allows the detector to automatically adjust its sensitivity back to the factory setting when it becomes more sensitive due to contaminants settling in its chamber. In order for this feature to work properly, the chamber must never be opened while power is applied to the smoke detector. This includes cleaning, maintenance, or screen replacement.
All models also feature a restorable, built-in, fixed temperature (135°F) thermal detector and are also capable of sensing a freeze condition if the temperature is below 41°F. Models 2WTA-B, 4WTA-B, 4WTAR-B, and 4WITAR-B contain a piezoelectric horn that generates the ANSI S3.41 temporal pattern in an alarm condition.
All detectors in a zone will sound when the power supply to them is reversed. The RRS-MOD can be used for the power supply reversal function.
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