601P

OPTICAL SMOKE

601P detectors are capable of detecting the visible smoke produced by materials which smoulder or burn slowly, i.e. soft furnishings, plastic foam etc; or smoke produced by overheated but unburnt PVC. These detectors are particularly suitable for general applications and areas. Optical only detectors are not suitable for detecting fast burning fires producing little visible smoke or very black smoke.
The novel design of the asymmetrical sampling chamber and signal processing techniques stop unwanted alarms caused by very small insects, i.e. thrips. Smoke entering the sampling chamber scatters the infra-red light pulses onto a photodiode. These pulses are converted to an electrical signal which is compared against a preset alarm level.

601PH

HIGH PERFORMANCE OPTICAL SMOKE

601PH detectors react to the complete range of fire products, from slow smoldering fires, producing visible particles to open flaming fires producing large numbers of very hot smaller sized aerosols. The combination of optical and heat technology allows detection of clear burning fire products which hitherto could only be easily detected by ion-chamber For normal ambient conditions the HPO behaves as a normal detector. Only when a rapid rise in temperature is detected does the sensitivity of the detector increase and the presence of smoke will confirm a fire condition which will be trasmitted as an alarm level. The 601PH design incorporates a unique “mousehole” optical chamber whith an unrivaled signal to noise ratio providing high resilience to dust and dirt which means reduced servicing cost. In addition a unique chamber cover actually draws slow moving smoke into the chamber to provide a more responsive detector.

601H-R     601H-F

HEAT, RATE-OF-RISE 601H-R, FIXED TEMPERATURE 601H-F

Heat detectors offer an acceptable, but less sensitive alternative to smoke detectors if environmental conditions rule out their use. 601H-R (rate of rise) and 601H-F(fixed temperature) detectors detect abnormally high rates of rise of temperature and abnormally high (static) temperatures respectively HEAT, RATE-OF-RISE 601H-R, FIXED TEMPERATURE 601H-F For general use and particular where the ambient temperature may be low, a rate of rise heat detector 601H-R is to be preferred. A fixed temperature limit is also incorporated in these detectors.
In many environments, e.g. kitchens, canteens and boiler rooms, sudden, large changes in temperature are considered normal therefore rate-of-rise detectors are generally not suitable in these cases and a slower response fixed temperature detector 601H-F should be used.