The thermal gas mass flowmeter adopts the principle of thermal diffusion, which is a technology with excellent performance and high reliability under harsh conditions. Its typical sensing elements include two thermal resistors (platinum RTDs), one is a velocity sensor and the other is a temperature sensor that automatically compensates for gas temperature changes. When these two RTDs are placed in a medium, the velocity sensor is heated to a constant temperature difference above ambient temperature, while the other temperature sensor is used to sense the temperature of the medium. The mass flow rate of gas passing through the velocity sensor is calculated based on the heat transfer of the sensing element. As the gas velocity increases, the amount of heat transferred from the sensor to the medium also increases.
(1) All products are designed with no moving parts to prevent sensor blockage caused by dirty media or media particles.
(2) Wide range ratio of 100:1, sensitive to low flow without the need for multi-stage measurement, suitable for various ranges on site.
(3) Almost no pressure loss, overcoming the disadvantage of traditional differential pressure method that cannot measure due to low pipeline pressure.
(4) Resolve various practical issues for users, such as inadequate installation of straight pipe sections, changes in composition, poor measurement results, etc. The component changes can be corrected, the sensor can be cleaned online, and the insertion length can be adjusted arbitrarily.
(5) Sensors can be selected/multi-point to meet various usage requirements and high-precision measurements.
(6) Sensor insertion or online installation reduces installation costs and is suitable for measuring various pipe diameters.
1. Setting of different gas coefficients
2. Display zero point reset
3. Correction of output analog quantity
4. Multi point nonlinear curve correction
5. Wide range ratio greater than 100:1
6. Large caliber and small flow measurement have higher accuracy
7. On site instrument settings can be made
8. Encapsulated sensors with near zero pressure loss
9. Not sensitive to vibration
10. The requirements for straight pipe sections are relatively small
11. Measurement values are independent of pressure, true mass flow detection
12. Using expert algorithms to achieve high precision and stability of instruments
13. Response time less than one second
14. LCD display with instantaneous cumulative dual display, no need to switch
Accuracy | ± 1.0~1.5% (pipeline type) ± 1.5~2.5% (plug-in type) |
Repeatability | 0.2% full scale |
temperature range | Environmental temperature -20 ℃ -70 ℃ |
Medium temperature | -20 ℃ -200 ℃ or -20 ℃ -350 ℃ |
Power supply | 24VDC/220VAC |
Analog output | 4-20mADC |
response time | ≤ 1 second |
temperature coefficient | 0.05%/℃ |
communication interface | RS485 |
Display mode | LCD display instantaneous and cumulative flow rate |
Process pressure | ≤ 4.2MPa (if the pressure is greater than this, customization needs to be negotiated with our company)） |
Process Connection | Flanges, if other installation methods are required, please consult with our company in advance for customization |
Explosion proof grade | ExdIICT4 |
Protection level | Sensor IP67, transmitter IP65 |
Applicable medium | Gas without moisture |
measuring range | 0.05-80m/s (standard state is 20 ℃, 0.10133MPa)） |
Probe material | The standard is 316L; Ha C; tantalum |
Probe rod material | The standard is 1Cr18Ni9Ti; 316L； Ha C; tantalum |
Shell material | Aluminum castings with powder coating for installation in hazardous areas |
Electrical interface | M20×1.5 |
Warranty period | Within one year of the normal use period of the product |
pressure loss | For pipelines with a diameter greater than DN80, they can be ignored |
