1. Introduction 
 QC-3-type air sampler is a function LCD digital display of time for collecting atmospheric environment or the working environment in the gas samples (mainly used in large volume sampling area) of the conventional apparatus, it is by the suction pump, flow meter, time control circuit and power supply. Suction pump to pump, with the exhaust pressure, load capacity, flow stability, low noise characteristics. Can be widely used in metallurgy, mining, chemical, construction, casting, power and environmental monitoring, health and epidemic prevention departments, the sampler with electronic timing and pace of compact, small size, light weight, easy to carry, simple, durable, stable and reliable performance, etc., is currently the large flow of gas in the ideal sampling instrument products 
 2. Technical parameters 
 a. load capacity: 4000Pa load flow ≥ 2L/min 
 b. Flow rate :0.2-3L / min 
 c. flow stability: ≤ 5% 
 d. flow error: ≤ 5% 
 e. Timing range :1-99min 
 f. Timing Error: <0.1% 
 g. Operating temperature: -10-45 ℃ 
 h. Continuous working time: 5 hours battery greater than or equal 
 i. Host Dimension: 115 × 190 × 60mm 
 j. Weight (with battery): 700g 
 3. Instrument configuration 
 a. host sampler 
 b. power supply / charger 
 c. absorption bottle rack (hanging) 
 d. Buffer bottle (safety bottle) 
 e. Tripod 
 f. Manual 
 g. Certificate 
 h. aluminum box