Standard Features

� Waterproof design

� Minimal standby current

� Low profile shape

� Utilizes a bi-metallic strip to sense temperature Change, therefore consuming no standby current and providing high reliability

� No mounting base required

Application

The DFG-1W70L is 70°C fixed temperature waterproof heat detector are suited for installation where high heat output fires are expected or in areas where ambient conditions would not allow use of other detection methods.

The detector has awide operation margin allowing itto response to both slowand fast increases in temperature, it can sense temperature reliably in a horizontal or vertical position.

Operation

The DFG-1W70L fixed temperature waterproof heat detector consists of a disk comprising of two metals, with considerably different coefficients of expansion, which are bonded together. When the ambient temperature exceeds the fixed temperature range of the detector, the disk bi-metal trips bringing the PGS (Platinum Gold Silver) contact points into contact, establishing a short circuit and triggering an alarm. When the temperature decreases the bi-metal disk returns to its initial shape and the contact open. A build in seal LED provides a visual indication of the alarm condition.

No base is required for the detector, short flying lead are provided for connection to the conventional zone.