EVC-P

The EVC-P is an attractively-styled, low profile photoelectric smoke detector for use in conventional fire detection systems. The EVC-P has a chemically etched, stainless steel insect screen therefore reducing the ingress of insects and airborne contaminants.   Features Optical detector, detecting visible particles of combustion Low profile, stylish appearance Supplied with protective dust cover, (remove during commissioning) Non-polarised terminals Unauthorised head removal signal facility Low monitoring current Patented OMNIVIEW TM 360o LED fire alarm indicator Remote indicator output Compatible with STB-4, STB-4SD and STB-4SEbases The smoke chamber of the EVC-P is constructed so that light cannot enter from outside, but smoke can pass through the chamber slots. The EVC-P utilises the light scatter sensing principle. The LED pulses every 8 seconds to maintain a low monitoring current. A quick charge time (20 seconds) is also achieved. The detector incorporates an alarm verification function which requires two successive pulses before an alarm is given. The interval between the first and second pulse is automatically reduced to four seconds after the first alarm level is monitored. The detector design provides strong immunity to air velocities, contamination and RF interference. The geometry of the smoke chamber and optics support assembly is designed to give the best possible signal to noise ratio, resulting in excellent response characteristics.

 

EVC-H-A1S, EVC-H-A2S, EVC-H-BS, EVC-H-CS

The EVC-H is an attractively styled, fast response, low profile heat detector. It has been designed to replace any previous Nittan heat detector. Features: Low profile, stylish appearance Different response grades available Non-polarised terminals Unauthorised head removal signal facility Low monitoring current Patented OMNIVIEW TM 360o LED fire alarm indicator Remote indicator output Compatible with STB-4, STB-4SD and STB-4SE bases The EVC-H range of heat detectors are non mechanical and use a thermistor of low thermal mass as the sensing element giving a fast response. Although these detectors operate on a fixed temperature threshold only, their fast response makes them generally suitable for use where rate-of-rise detectors would be used.