according to the EN 531 standard (which has been superseded by the ISO EN 16112)
telecommunications technicians
It is recommended that regular checks using the self test function be made before and during the safe approach of electrical voltage testing
the LEL sensors are generally explosion-proof with flame arrestors and approved for use in classified hazardous areas (Class 1
Part Number: A02CRC24X48
RKI Instruments 66-6304-30-W AirLink T3A sensor/transmitter with j-box Explosion Proof high heat sleeves according to the EN 531RKI Instruments 66 6304 30 W $4,299. 97 Save money NO state or local sales tax, free shipping. AirLink T3A sensor transmitter with j box Explosion Proof Hydrogen Chloride (HCl), 0 30 ppm with 900 MHz radio AirLink T3A Wireless Transmitter, Wire Powered, Explosion Proof, No Relays Explosion Proof, Class I, Division 1 for CO, H2S, O2, LEL, & CO2 Class I, Division 2 for all other gases 12 35 VDC wire powered Add R and $279 to add 2 relays Add Y for 2. 4