Taking into consideration all the problems concerning conventional fire detectors, the Apollo design office have developed engineering solutions at a highest international level, which combine a high sense of beauty, quality and reliability.
The series 60 has undergone some rigorous tests which proved that it may be ranked among currently the best affordable types of conventional fire detectors. The series 60 consists of ion and optical smoke detectors, and of the three types of heat detectors. In all these a special chip whose high efficiency has been proved during many years of operation of the first Apollo analogue addressable detectors series 60.
The fire detectors series 60 features i.a.:
|Operating conditions 23oC, 24VDC||S60 ion-based||S60 optical||S60 heat detection||S60 heat detection Class 1 60oC
|S60 heat detection Class 2 65oC
|Detector dimensions (HxÆ)||42x100||42x100||42x100||42x100||42x100|
|Detector dimensions+socket (HxÆ)||50x100||50x100||50x100||50x100||50x100|
|Measuring system||Ionisation source Am 241; 0.9m Curie; 33kBq||Light diffusion sensed by a silicone photo-diode||Temperature differential system with two thermistors||Temperature differential system with two thermistors||Temperature differential system with two thermistors|
|Max. monitoring current at 24V||45mA||45mA||53mA||53mA||53mA|
|Alarm current at 24V||52mA||52mA||52mA||52mA||52mA|
|Alarm indicator||Red LED||Transparent LED
Red LED at alarm
|Red LED||Red LED||Red LED|
|Max. wind speed||10m/s||no impact||no impact||no impact||no impact|
In case of this type of fire detectors, the ionising radiation source is Americium (Am) 241 with a low radioactivity. Resultant ions enable a current flowing in both the measuring and reference chambers. (the latter is tight so that smoke does not penetrate into it). A current differential across the chambers is sensed by an amplifier and once a specific threshold has been surpassed, the detector is activated. The radiation level at the sensors is extraordinarily low so there is no limit as to their number.
In this type of fire detectors, a LED sends off a focused light beam at 10 seconds intervals. The beam passes by a receiver without illuminating same. Once smoke has appeared, the beam disperses and as a result light reaches a photodiode. An amplified signal from the photodiode activates the detector. Upon the detection of the first smoke, two additional light impulses at a 2 seconds interval are let off. Should the resultant measurements confirm a smoky condition that corresponds to an excessive smoke concentration, then the detectors activates an alarm.
The detector is of a temperature differential type. It means that the detector is operated by a quick temperature increase or, when the temperature is rising slowly, the activation occurs upon a specific alarm temperature set at the detector is being exceeded. From the operating characteristics of the detector it may be seen, that at 25oC across the detector and with an ambient air temperature rising at a rate of ca. 4oC/min., the activation temperature is 50oC. The same detector at a rate of less than 1oC/min. will be activated at the rated alarm temperature of 60oC.