bids are invited for annual maintenance contract service - laser speed meter annual maintenance contract for networking devices (version 2) a) checking and adjustment of sample air flow b) cleaning of aerosol sensors c) cleaning of lenses in sensors d) cleaning/replacement of filters (if required) e) inspection of optical fiber cables f) adjustment of lamp (if required) g) cleaning/replacement of tubings (if required) h) inspection of heating element i) calibration of aerosol sensors – particle velocity & number j) inspection and cleaning of pump k) upgradation of pdanalyse software (if required) total quantity :