bids are invited for electrochemical type gas monitoring equipment - electrochemical type gas monitoring equipment with sensor head suitable for measuring carbon monoxide co gas range 0 250ppm voltage 10 30vdc output 4 20ma with zero and span setting dust proof housing crowcon tritech endee make , visibility sensor system - visibility sensor system for detecting density of smoke in three descrete levels system comprising of sensor unit and reflector plate with fixing arrangements voltage110 230vac outputrelay contact with terminal block make alliance , on delay type electronic timer with range 0 30 sec 240vac - on delay type electronic timer with range 0 30 sec 240vac with 2no 2nc relay contacts rated for 5a at 250vac housed in square type frp casing with 11 pin plug in type base similar to model h1dt 30 of eapl , electromagnetic relay with 2 no 2 nc contacts rated for 5a 250 - electromagnetic relay with 2 no 2 nc contacts rated for 5a 250 vac coil housed in square and clear frp casing with 8 pin plug in type base my2 us sv of omron make with din rail mntg type base , thyristor ref no semikron 0241 skkt 57 b 16 e 0241 an - thyristor ref no semikron 0241 skkt 57 b 16 e 0241 an alternate make ixys ref mcc56 1216 b4330 german make total quantity : 75