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Telephone: +86 182-2103-2874
Address: Room 402, building B, shuangshuanglou, 650 shenzhuan Road, Songjiang District, Shanghai Online consultation

Gas mass flowmeter

Medical industry center oxygen supply system, cable inflator, mechanical and electrical industry, industrial gas, food industry, equipment ventilation detection device, some gas supply industry and scientific research institutions that need to be portable and convenient for application. ...
Hotline: 182-2103-2874

Product introduction

Cx-gmfm-700 gas mass flowmeter
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1. Product features

  • The sensor chip adopts thermal mass flow measurement without temperature and pressure compensation to ensure the high precision measurement of the flowmeter
  • It has high sensitivity and can be used to measure the minimum initial flow
  • Multi sensor integration is realized on a single chip, which makes the range ratio reach 50:1 or even higher
  • High stability, high precision and excellent repeatability in full range
  • It supports the measurement of various gases and allows customers to calibrate some special gases on site
  • Low power consumption, low voltage loss
  • Fast response speed, < 2S
  • The output mode is flexible, which can be directly displayed on LCD screen or queried and output by upper computer through communication interface
  • data
  • LCD displays instantaneous and cumulative flow, ambient temperature, and allows field keyboard configuration parameters
  • With the function of over range alarm indication, the total amount can be set easily
  • Portable design, battery power supply mode and external power supply mode can be arbitrarily switched
  • NPT connection mode is easy to install and use; special medical interface mode can be selected, and other connection modes can be used
  • customized
2. Product application
Medical industry center oxygen supply system, cable inflator, mechanical and electrical industry, industrial gas, food industry, equipment ventilation detection device, some gas supply industry and scientific research institutions that need to be portable and convenient for application.
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3. Working principle
Cx-gmfm-700 series gas mass flowmeter is a MEMS flow sensor chip independently developed by our company. Its principle is to use the dependence of heat and mass transfer of flowing gas to generate temperature changes upstream and downstream to obtain the mass flow of gas.
The flowmeter can generate heat source and measure temperature at the same time. When the chip is working, a stable temperature field is formed around the sensor. Once a certain mass of gas flows through the sensor, the gas flow will destroy the distribution of the temperature field and form a specific temperature field distribution which depends on the mass and velocity of the gas. The sensor on the micro electro mechanical system (MEMS) flowmeter chip will measure this change and convert it into an electrical signal, which will be amplified, conditioned and linearized by a special circuit transmitter. Due to the different mass distribution of the gas flow rate or the total gas flow rate, the sensor can produce stable mass.
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4. Performance index
performance parameter seven hundred and six seven hundred and twelve Company
range 0~10 0~200 0~1000 L/Min
accuracy ±?(2+0.5FS) ±?(3+0.8FS) ±?(3+0.8FS) %
Repeatability one %
response time ≤?2 sec
Power supply mode 4 AA batteries or external adaptive power supply ?
power waste ≤?10 mW
Output mode RS485 (optional) ?
Display mode LCD ?
Display units Instantaneous flow rate: L / min; cumulative flow rate: m 3 ?
Display resolution zero point zero one one one L/Min
keyboard Three buttons ?
Function description Password setting; total setting and clearing; alarm function ?
working pressure ≤?0.8 MPa
working temperature -10?~?55
Pressure loss ≤?500 Pa
Working time cycle (battery) >?60 day
Standard calibration gas oxygen ?
Outgoing line Dedicated MINIUSB (optional) ?
pipe diameter 6mm 12mm mm
Mechanical interface NPT?1/4,?BSPT?1/4 NPT?1/2,BSPT?1/2 ?
weight About 350 g g
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5. Mechanical dimension drawing
 Structure diagram of gas mass flowmeter ?
Note: if the flow direction is always 0, the direction of the flow will be shown as 1;
2) The product can be equipped with a 0.5m long connecting communication cable with MINIUSB plug, which can realize external power supply
And communication; the definition of its lead is shown in the figure below.
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6. Lead definition:
Pin number Pin definition
gules Input power positive (+)
black Input power negative (-)
green RS485 digital signal a
blue RSB digital signal 485
yellow empty
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 Structure of gas mass flowmeter 2