bids are invited for pm 2.5 sampler - 1.sampling principle: impactor based design as per epa / usepa and cpcb guidelines specifications 2.particle separation: omni-directional air inlet with pm10separation through an impactor followed by pm 2.5 separation through a wins impactor 3.sampling rate: sampling rate of about 1 m3 / hr, unaffected by voltage fluctuations and filter chocking maintained by critical orifice system, microprocessor based digital flow controller and other suitable flow controller. 4.filter holder: filter holder, designed to accept any standard filter media of 46.2 mm diameter.5.samplingdurationrecorder: time totalizer to record the sampling duration to the nearest 0.01 hour.6.flow recorder & display system : recorder for flow rate, volume of sampled air, air temperature, filter temperature, barometric pressure and filter pressure with 20×4 lcd display showing real time viz.7.auto shut off facility: auto shut off and start facility for the sampler if flow rate drops by more than 10 % from the designed value with accuracy ± 2 min / month.8.pump: oil free, low noise, driven by brushless induction motor.9.power requirement: single phase ac, 220 volts, 50 hz supply, sampler to be unaffected by + / - 10% fluctuation in supply voltage.10.std. accessories: the equipment is to be supplied with mains cord and tool kit. , respirable dust sampler - 1.general: equipment shall conform to bis, is: 5182 ( part-23 ) : 2006.2.blower : noiseless, brush less 3. noise: operating noise of the equipment shall not exceed by more than 5 db ( a ) than the ambient noise level at a distance of 5m from the equipment. 4. flow rate : 0.8-1.4 m3 / min free flow 5.particle size: coarser particles > 10 microns shall be separated by a sharp cutoff cyclone and collected separately. the particle size of less than 10 microns shall be collected on glass micro fiber filter paper of standard size, 203 mm x 254 mm to be mounted in the filter holder.6.sampling time : maximum, continuously for 24 hours 7.sampling time recorder : 0 to 9999.99 hrs.10.time totalizer circuit :for the detection of blower stoppage due to any reason.11.power requirement : 230 + 10 v, single phase, 50 hz ac 12.voltage stabilization : by built in voltage stabilizer with automatic shut-off beyond 170-270v gaseous sampling : flow rate : 0.3 to 3 lpm, + 2% accuracy , flow control: four inlet and one outlet manifold with built in needle valves for flow control at the inlet, temperature controller : gaseous sampling attachment should be fitted with thermo electrical cooling facilities to maintain the impingers at 15o c , sampling train: capacity - 35 ml borosilicate glass impingers ( 04 nos. ) , total quantity : 1