Optical smoke detector with extended spectrum of detected smokes and with isolator is intended for the automatic fire alarm signalling as a smoke detector in autonomous applications and in FDFAS for railway wagons.
It responds to both visible and invisible smoke particles (aerosols) on the principle of detection of scattered infrared radiation.
Detector MHG 262V0 is a conventional (non-addressable) detector derived from interactive addressable detector MHG 262i. Detector connects to an autonomous mounting base MHY 734.037 with screw terminals or to base MHY 734.038 with crimp connector. For use in railway wagons the detector connects to the MHY 734.029V0 mounting base.
Detector evaluates the fire situation based on measuring The detector contains a program that evaluates the fire situation pursuant to measuring of the surrounding smoke concentration, namely in agreement with the following adjustable characteristics:
- basic sensitivity of the detector; it monitors the surrounding smoke concentration increase compared to the quiescent state, that compensates the climatic and other influences (environs
temperature, pressure etc.) continuously; the basic sensitivity can be adjusted in eight degrees that must be selected with reference to the detector’s combustion gas load that the detector
- reaction time; the verification level of the fire situation is concerned; also adjustable in eight degrees, however they can’t be expressed by a simple time stamp, because the reaction time
depends on the time progression of the fire situation
- dustiness watch; it monitors the rest level of the detector, and upon this it evaluates the dustiness rate of the optical chamber and consequently the reliability of the detector; it can be
adjusted in seven degrees, or inactivated.
Adjustable parameters are set by the MHY 536 (535) addressing preparation.
Detector MHG 262V0 has built-in circuit which at detector’s fault (e.g. too dusty) disconnects the positive terminals +L1 and +L2, that are in normal state connected. This circuit is used for fault signalling.
When installing the detector to high places, the MHY 736 mounting head on a rod can be used.
The detectors comply with ČSN EN 54-7 standard and are subject to conformity assessment according to Act No. 22/1997 Sb., As amended by Act No. 71/2000 Sb. and relevant government regulations.
|Power supply||autonomous mounting base or railway FDFAS LITES|
|Optical signalling||couple of red LEDs|
|Testing||testing rod MHY 506|
|Protection according to ČSN EN 60529||IP 43|
|Radio screening degree according to ČSN EN 55022||B class equipment|
|Checking and setting of parameters||addressing preparation MHY 536|
|Dimensions||(Ø98 × 58) mm|
|Non-flammability of plastics||according to UL 94 - V0|
Product is intended for operation with safe equipment in sense of ČSN EN 60950.
|Application of the detector is in areas protected against weather conditions with classification according to ČSN EN 60721-3-3|
|K: climatic conditions for environment||3K5|
|- working temperature range||-25 °C to +70 °C|
|- max. relative humidity||95 % at 40 °C|
|- without condensation and ice accretion|
|Z: special conditions||3Z1 heat radiation negligible, 3Z8 irrigation water|
|B: biological conditions||3B1 without presence of flora and fauna|
|C: chemical active substances||3C2|
|S: mechanical active substances||3S1|
|M: mechanical conditions||3M2|
|Duration of significant temperature (45°C ÷ 70°C)||2 months/year|
|Duration of significant humidity (85 % ÷ 95 % / ≤ 40°C)||100 hours/year|
|Maximum duration of spraying||10 min/month|