bids are invited for sitc of open-path type hydrocarbon detector , sitc of point type hydrocarbon detector , amc for opd and ptd - make and model mentioned in item spec doc , calibration of 3 nos of portable multigas detectors , emergency break-down visit on call basis , refilling 0.5 ltr propane cylinders on yearly basis , spare sensor co h2s o2 lel for portable gas detector , spare pcb for portable detector , spare uppercase assembly unit for portable detector , spare lowercase assembly unit for portable detector , spare filter set fo opgd , spare pcb for gastron gir 3000 hcd , rectification,fault diagnosis,calibration, alignmnet and servicing for existing hcds - one time total rectification of all existing hcds of above make and model before commencement of amc. identification of fault and damages under scope of vendor. total quantity : 60