procurement of spares for eip enviro make ash level detection system installed at esp hoppers of 210 mw atps mppgcl chachai procurement of spares for eip enviro make ash level detection system installed at esp hoppers of 210 mw atps mppgcl chachai , sensing probe of ( pr-550-esp ) 610 mm length ( ptfe insulation ) , mounting connection : 40 nb socket ( side mounted ) ( threaded type ) suitable for rf level switch model - 550 make :- eip enviro , electronic controller having supply voltage: 240 v ac, 50 hz suitable for rf level switch model - 550 make : eip enviro , co-axial cable for interconnection between sensing probe to electronic controller