QE-600 series thermal mass flowmeter 
 First, the principle 
 The thermal mass flowmeter uses the principle of thermal diffusion, thermal diffusion technology is an excellent performance under harsh conditions, high reliability technology. The typical sensing element includes two thermal resistance (platinum RTD), a speed sensor, a temperature sensor automatically compensates for gas temperature. When the two RTD is placed in the medium, which speed sensor is heated to a constant temperature above ambient temperature, another temperature sensor for sensing the medium temperature. The gas mass flow through the speed sensor to calculate the amount of heat transfer through the sensing element. The gas flow rate increases, the more heat the media away. So that the sensor temperature decreases. In order to maintain the temperature constant, you must increase the flow rate is proportional to the operating current of the sensor part of this increase in current size and media. 
 Second, the Introduction: 
 Our gas flowmeter range than small range below the lower limit of the basic flow is lost, but this is unacceptable in some areas, trade settlement in the gas, and other occasions more intolerable. IKT series of thermal gas mass flow meter has a complete solution to this problem. 
 1 Features 
 IKT series of thermal gas mass flow meter can gas flow measurement can also be used in the field of process control. Introduction of advanced U.S. technology to produce, without temperature and pressure compensation, direct measurement of the mass flow of the fluid. Its outstanding features are: no moving parts; pressure loss is small; range than wide; high precision; high reliability; easy to install, easy to operate. In all areas of a comprehensive alternative to the orifice plate and differential pressure flowmeter. 
 (2) purposes: 
 This product is widely used in steel mills, coking plants, petroleum, chemical, thermal, medical, thermal power plants, environmental protection and other industries. 
 Can be: 
 ● steel mills, coking plants, gas flow measurement 
 ● boiler air flow measurement and secondary air flow 
 ● chimney flue gas flow measurement 
 ● water treatment in the waterfall gas flow measurement 
 ● cement, cigarettes, glass production process gas flow measurement 
 ● Compressed air flow measurement 
 ● natural gas, coal gas, liquefied petroleum gas, flare gas, hydrogen gas flow measurement 
 Third, the technical parameters: 
 Measuring range: (0.05 ~~ 80) Nm / s (standard condition 20 ℃ 101.33KPa) 
 ● measurement: tube-stage plug-in 
 ● Temperature range: ambient temperature: -40 ℃ ~ +60 ℃ 
 Medium temperature: -10 ° C to +500 ° C 
 ● Accuracy: ± 1% reading; ± 0.5% full scale 
 ● Repeatability: ± 0.5% of full scale 
 ● output 4-20mA DC (maximum load 600Ω); the RS232; RS485 
 ● Response time: less than the 1S thermal mass flowmeter 
 ● supply voltage: 24 VDC ± 10% 
 Mechanical connection: 3/4NPT stainless steel fasteners (plug-in); flange 
 ● the length of the probe: 800mm (length of the plug-in standard length, special please state) 
 ● probe diameter: 18mm (plug-in) Thermal mass flowmeters 
 ● The length of straight pipe: no strict requirements 
 ● pressure loss: You can ignore the thermal mass flowmeter 

 ● Working pressure: 1.6MPa; 7.3MPa 

 ● Field Display: LED display; LCD display 

 Data Protection: Accumulated amount saved in EEROM within, (power-off can save a hundred years) 

 ● sensors and pipeline table material: 316L (optional Hastelloy C) 

 ● Protection class: IP65 Thermal mass flowmeters 

 ● proof grade: ExdIICT4 

 Fourth, the application examples 

 (1) petrochemical industry 

 Applications: monitoring of flare gas emissions 

 Advantages: Wide range, the sensor difficult to plug the online insertion and removal cleaning, apply to gas range 

 (2) the power industry 

 Applications: the boiler primary air, secondary air, coal grinding wind wind measurement 

 Advantages: easy to install, no straight pipe requirements, low pressure loss, no temperature and pressure compensation, can be used under harsh conditions (such as: low pressure where the air contains dust particles, badly worn, etc.) 

 (3) the metallurgical industry 

 Applications: blast furnace gas, coke oven gas measurement 

 Product advantages: the actual media group, calibration, correction of the components change, line cleaning the sensor, the insertion length can be adjusted 

 (4) the electronics industry 

 Applications: high-purity gas mass flow measurement 

 Advantages: No temperature and pressure compensation directly measure the mass flow sensor head highly polished, can be used in trade settlement 

 (5) Heating, ventilation and air conditioning systems (HVAC) 

 Advantages: reaction products are sensitive and reliable operation, no strict requirements on the installation of straight pipe 

 (6) water treatment industry 
 Applications: measurement of the aeration tank of air traffic 

 Product advantages: dirt, dust resistance, a truly non-pressure drop, on-site installation easy 

 7 food industry 

 Applications: access to the reactor the amount of gas, the control process and quality 

 Advantages: Sanitary 3A, high purity, all wetted surfaces made of stainless steel, wide turndown ratio