A RATE-OF-RISE TEMPERATURE HEAT DETECTOR ALSO HAVING A FIXED TEMPERATURE ALARM AT 57 DEGREES CELSIUS. THE DETECTOR COMPRISES A CIRCULAR LOW-PROFILE ABS-TYPE PLASTIC CASING CONTAINING METAL FASTENINGS AND CONNECTING TERMINALS, A POPULATED PRINTED CIRCUIT BOARD WITH THE THERMISTOR CONNECTED AS A SENSING ELEMENT PLUS AN EXTERNAL 360-DEGREE LIGHT EMITTING DIODE (LED). THE DETECTOR IS ANALOGUE-ADDRESSABLE AND USED IN CONJUNCTION WITH A FIRE ALARM SYSTEM CONTROL PANEL. IT HAS NO IN-BUILT AUDIO OR VISUAL WARNING OR RECORDING DEVICE; THE EXTERIOR LED FITTED SERVES ONLY TO INDICATE WHEN THE DETECTOR IS BEING QUERIED BY ITS CONTROL PANEL OR WHEN THE DETECTOR IS IN ALARM MODE. THE HEAT DETECTOR UTILISES A HIGHLY LINEAR THERMISTOR CIRCUIT WITH THE THERMISTOR MOUNTED EXTERNALLY. THE THERMISTOR CIRCUIT PRODUCES A VOLTAGE PROPORTIONAL TO THE TEMPERATURE WHICH IS SCALED AND TRANSMITTED AS A DIGITALLY ENCODED VALUE TO A CONTROL PANEL. DETECTOR HEAD DIMENSIONS: 104MM DIAMETER X 42 MM H, WEIGHT: 100GM. THE DETECTOR MAY BE SOLD INDIVIDUALLY IN A SMALL CARDBOARD BOX BUT IS MORE COMMONLY DESPATCHED WITHIN LARGER CARDBOARD CARTONS CONTAINING 10 OR 100 UNITS.

CLASSIFICATION HAS BEEN DETERMINED IN ACCORDANCE WITH THE FOLLOWING: GENERAL INTERPRETATIVE RULES (GIR)S GIR 1 HAS BEEN USED TO CLASSIFY THIS PRODUCT BY THE TERMS OF HEADING 9027 - INSTRUMENTS AND APPARATUS FOR PHYSICAL OR CHEMICAL ANALYSIS (FOR EXAMPLE, POLARIMETERS, REFRACTOMETERS, SPECTROMETERS, GAS OR SMOKE ANALYSIS APPARATUS); INSTRUMENTS AND APPARATUS FOR MEASURING OR CHECKING VISCOSITY, POROSITY, EXPANSION, SURFACE TENSION OR THE LIKE; INSTRUMENTS AND APPARATUS FOR MEASURING OR CHECKING QUANTITIES OF HEAT, SOUND OR LIGHT (INCLUDING EXPOSURE METERS); MICROTOMES GIR 5 (B) HAS BEEN USED TO IDENTIFY THE PACKAGING GIR 6 HAS BEEN USED TO CLASSIFY THE GOODS TO SUBHEADING LEVEL 9027 80 - OTHER INSTRUMENTS AND APPARATUS CN CODE 902780 80 - OTHER THAN EXPOSURE METERS OR PH METERS, RH METERS AND OTHER APPARATUS FOR MEASURING CONDUCTIVITY