supply of supply, installation and commissioning of air flow relay testing unitsupply, installation and commissioning of air flow relay testing unit,supply, installation and commissioning of air flow relay testing unit (microprocessor based) . specification as below: - (1) power supply 230v ac, 50 hz (2) capacity: air pressure +100mm of wc and v acuum -100 mm of water column (3) lcd display for no. of cycles, cut in and cut out pressure readings, mv drop readings. (4) vacuum/pressure will be automatically ramped up and down to operate the air flow relay and cut in and cut out pressure readings will be recorded by the equipment. (5) communication port to upl oad the test parameters to test equipment and to download test results to the pc. (6) two different port for 1) qvmt, qvsl, qvrh 2) qvsi. make/brand slazer or equivalent. [ warranty period: 30 months after the date of delivery ] ]