CH4 C2H6 C3H8 C4H10 C5H12 C6H14 C7H16 C2H4 C2H5OH C3H6 LPG Pellistor Replacement IR Gas Detector • Pellistors do not fail safe: sensors can be ‘poisoned’ and rendered insensitive to gas by silicones, lead, sulphurs and chlorinated compounds. • Pellistors must be operated behind a sinter (flame arrestor): which may become blocked, thus preventing gas from reaching the sensor. • Pellistors may burn-out: if exposed to gas concentrations in excess of 110%LEL. • Pellistors are high-maintenance: sensors must be regularly tested with gas to ensure they are still operational. Sensors typically last 3-5 years, after which they must be exchanged. • Pellistors need oxygen: their ability to detect gas reduces significantly in oxygen deficient atmospheres. IREX is an innovative infrared (IR) flammable gas detector designed specifically to directly replace pellistor (catalytic bead) type flammable gas detectors. IREX operates from control systems designed solely for use with pellistor-based gas detectors: it produces a mV Wheatsone Bridge type signal (as per a pellistor) and operates from as little as 2.9Vdc. IREX is supplied with an M20 type fixing enabling originally installed detector junction boxes and cables to be retained. IR Technology versus Pellistor Gas Sensors Pellistor sensor technology has provided effective flammable gas detection at low cost for many years. Pellistors do however have several disadvantages: IREX All of these issues are overcome using IREX.

Area reserved for distributor stamp The IREX concept enables pellistor-based gas detection systems to be upgraded to dual-wavelength IR gas detector technology without incurring the very significant costs associated with upgrading the control system and re-installation. UK: 2 Blacklands Way, Abingdon Business Park, Abingdon, OXON, OX14 1DY +44 (0) 1235 557700 [email protected] US: 21 Kenton Lands Road, Erlanger, Kentucky 41018-1845 +1 859 957 1039 [email protected] NL: Vlambloem 129, 3068JG, Rotterdam +31 10 421 1232 [email protected] SG: Block 194 Pandan Loop, #06-20 Pantech Industrial Complex,...