Implement enterprise standard Q/WTH 08-2014: THM-700 series air quality flowmeter.

　　Working Principle:
The THM-700 series flowmeter is designed specifically for flow detection in air automatic station instruments, using the principle of "precise diversion technology+mass flow meter (air)". The THM-703 flow measurement range is 0-20L/m3, mainly used in PM10 and PM2.5 particle concentration monitoring and sampling instruments that use 16.7 L/m3 sampling. The flowmeter interface is made according to the internationally recognized diameter of 32.7mm (1.25 inches), and during measurement, simply remove the PM10 or PM2.5 cutter that uses 16.7 L/m3 flow rate and insert the flowmeter, which is fast and convenient. This instrument has the function of remote transmission of flow test data to a PC, enabling continuous measurement and recording of 4 data items in five minutes. The THM-702 flow measurement range is 0-3L/m3, mainly used for flow testing of monitoring instruments such as SO2, NO2, CO, O3, etc. THM-701 has a flow measurement range of 0-200mL/m3 and is used in conjunction with THM-703. It is mainly used for testing two mass flow meters in dynamic calibrators.

　　Instrument features:
◆ Adopting EPA standard cutter connection size, flow measurement, plug and play function;
◆ Adopting precise diversion technology, connected to a flow meter, with low resistance to the measured flow rate;
Touch interface, simple and practical, easy to operate;
◆ Can directly read instantaneous traffic or average traffic within a specified time period;
◆ Standard conditions or operating flow rates (0 ℃, 20 ℃, 25 ℃) can be selected as needed;
◆ Equipped with a wireless module, it can remotely set and record flow meter parameters;
◆ Automatic temperature and pressure compensation, screen automatic brightness adjustment;
◆ Built in lithium battery (with charger), can work continuously for 12 hours.