The addressable Thermal Detector FI750/T was developed for the indoor temperature supervision in a wide range of fi re detection applications.
Depending on the parameter setup in the fi re detection control panel, the detector operates either as rate-ofrise heat detector with a maximum alarm temperature of 58°C (EN 54-5 Class A1R), or as maximum heat detector with an alarm temperature of 78°C (EN 54-5 Class BS). In Class A1R the detector can be used up to a room height of 7.5m, in the Class BS mode a room height of 6m is permissible.
The loop technology with Labor Strauss protocol establishes a permanent communication between the fi re detection control panel and the detector. That ensures periodical function testing of the detector. Up to 240 loop elements can be addressed on a Labor Strauss loop. In this way, extensive fi re detection systems can be designed with a minimum expense in cabling.
The two multicoloured LED displays on the detector are visible from all directions, thus facilitating the identifi cation of the activated detector. The alarm condition is indicated in red and the test condition in green. In addition, an output is available for the connection of an optional remote indicator.
An integrated dual-isolator disconnects the loop in case of a short circuit. In this way, the undisturbed communication with the loop elements outside the faulty loop section is ensured. The detector address is set by means of the hand-held Programming Unit FI750/PU within the range 1 to 240. In addition, the programming unit allows several parameters, such as the default analogue value or the production date to be read out. Alternatively, the detector can be addressed automatically if it is connected to a compatible fi re detection control panel.
A detector function test can be conveniently conducted by using a test magnet or a thermal detector test device.
