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AN ANALOGUE-ADDRESSABLE OPTICAL SMOKE AND HEAT DETECTOR. THE DETECTOR UTILISES THE LIGHT SCATTER SENSING PRINCIPLE, USING BOTH INFRA-RED AND BLUE LIGHT EMITTING DIODES (LEDS) AND A PHOTO-DIODE AS THE SMOKE SENSING ELEMENT. THIS PROVIDES A MORE ACCURATE MEASUREMENT OF THE SIZES OF PARTICLES FOUND WITHIN ITS SENSING CHAMBER. BY CALCULATING THE RATIO OF THESE LIGHT SOURCES, WHICH OPERATE AT DIFFERENT WAVELENGTHS, IT CAN DETERMINE THE PARTICLE SIZE AND THUS DISTINGUISH BETWEEN SMOKE AND NON-COMBUSTION PRODUCTS SUCH AS STEAM DROPLETS OR DUST. HEAT DETECTION IS MADE USING A THERMISTOR OF LOW THERMAL MASS, WHICH CAN BE SET TO DETECT TEMPERATURE RATE OF RISE OR TO TRIGGER AT A FIXED AMBIENT TEMPERATURE. THE PRODUCT COMPRISES A CIRCULAR ABS-TYPE PLASTIC CASING CONTAINING METAL FASTENINGS AND CONNECTING TERMINALS PLUS A POPULATED PRINTED CIRCUIT BOARD WITH THE SMOKE SENSING CHAMBER ATTACHED; PLUS AN EXTERNALLY MOUNTED THERMISTOR AND A FURTHER EXTERNAL 360-DEGREE LED. IT ALSO INCORPORATES A CHEMICALLY-ETCHED STAINLESS STEEL INSECT SCREEN TO MINIMISE INGRESS OF INSECTS AND AIRBORNE CONTAMINANTS. THE PRIMARY FUNCTION OF THEDE 24680/14-1 PRODUCT IS THE DETECTION OF SMOKE. THE DETECTOR IS USED IN CONJUNCTION WITH A FIRE ALARM SYSTEM CONTROL PANEL. IT DOES NOT CONTAIN AN INTEGRAL RECORDING DEVICE NOR ANY AUDIO-VISUAL WARNING EQUIPMENT. IT HAS REMOTE INDICATOR OUTPUT. THE DETECTOR MAY BE SOLD SINGULARLY IN A SMALL CARDBOARD BOX BUT IS MORE COMMONLY DESPATCHED WITHIN LARGER CARDBOARD CARTONS CONTAINING 10 OR 100 UNITS.

A PORTABLE SINGLE GAS DETECTOR WHICH IS A ROBUST SINGLE GAS DETECTOR WITH SENSOR OPTIONS OF H2S, CO OR O2. THE DEVICE DETECTS AND MEASURES THE LEVEL OF A SINGLE GAS IN AMBIENT AIR AND IN THE WORKPLACE. GAS CONCENTRATION IS DISPLAYED ON AN INTEGRADED LCD. AUDIO, VISUAL AND VIBRATING ALARMS ALERT THE USER WHEN A DANGEROUS GAS CONCENTRATION IS DETECTED.

A PORTABLE, HIGH-PERFORMANCE, DURABLE SINGLE GAS DETECTOR WITH SENSOR OPTIONS OF O2, CI02, HCN OR PH3. THE DEVICE DETECTS AND MEASURES THE LEVEL OF A SINGLE GAS IN AMBIENT AIR AND IN THE WORKPLACE. GAS CONCENTRATION IS DISPLAYED ON AN INTEGRADED LCD WHICH INCORPORATES A BACKLIGHT. AUDIO, VISUAL AND VIBRATING ALARMS ALERT THE USER WHEN A DANGEROUS GAS CONCENTRATION IS DETECTED.

A PORTABLE SINGLE AND TWO-GAS DETECTOR. THE DEVICE DETECTS AND MEASURES THE LEVEL OF UP TO 2 GASES IN AMBIENT AIR AND IN THE WORKPLACE. THE 2 GAS SENSORS CAN DETECT 2 TOXIC GASES WITH A SINGLE SENSOR. GAS CONCENTRATION IS DISPLAYED ON AN INTEGRADED LCD WHICH INCORPORATES A BACKLIGHT. AUDIO, VISUAL AND VIBRATING ALARMS ALERT THE USER WHEN A DANGEROUS GAS CONCENTRATION IS DETECTED.

A PORTABLE MULTI-GAS DETECTOR. THE DEVICE DETECTS AND MEASURES THE LEVEL OF UP TO 4 GASES IN AMBIENT AIR AND IN THE WORKPLACE. IT IS AVAILABLE WITH A MAXIMUM OF 3 SENSORS WHICH CAN PROVIDE READINGS FOR 4 SEPARATE GASES (ONE 2 GAS SENSOR CAN DETECT 2 TOXIC GASES WITH A SINGLE SENSOR). GAS CONCENTRATION IS DISPLAYED ON AN INTEGRADED LCD WHICH INCORPORATES A BACK LIGHT. AUDIO, VISUAL AND VIBRATING ALARMS ALERT THE USER WHEN DANGEROUS GAS CONCENTRATIONS ARE DETECTED.