Thermal mass flowmeter is a precision instrument that uses the latest technology and processes and is produced in accordance with ISO:9001 quality system and complies with relevant EU standards.
The sensor part of the thermal gas mass flow meter consists of two reference-grade platinum resistance temperature sensors. When the meter is working, one sensor continuously measures the medium temperature T1; the other sensor self-heats to a temperature higher than the medium temperature T2. It is used to sense the fluid flow rate and is called a velocity sensor. The temperature AT=T2-T1, T2>T1. When fluid flows through, the gas molecules collide with the sensor and take away the heat of T2, causing the temperature of T2 to drop. To keep AT constant, the power supply current of T2 must be increased. The faster the gas flows, the more heat is taken away. There is a fixed functional relationship between the gas flow rate and the increased heat. This is the constant temperature difference principle.
Product features
1. No temperature and pressure compensation is required for gas flow measurement. The measurement is convenient and accurate, and the mass flow rate or standard volume flow rate of the gas can be obtained.
2. Wide range ratio, reaching more than 100:1, can be used for gas leak detection, especially in large pipe diameter, low flow rate, large flow range change and ultra-small flow measurement.
3. Good anti-seismic performance, measurement accuracy is not affected by vibration.
Long service life, the sensor has no moving parts and pressure sensing parts, simple installation and convenient maintenance.
4. Fast response speed, small pressure loss and good repeatability.
5. Adopting digital design, overall digital circuit measurement, LCD display is intuitive and clear, and measurement is accurate.
6. Equipped with RS485 communication module or HART protocol, centralized management can be achieved with the host computer.
Technical parameters
1
Connection method
(1) Flange type DN25~150mm (2) Threaded type DN25~50mm (3) Insert type DN125~5000mm
2
Measurement medium
(1) Single component or stable mixed dry gas (except acetylene and hydrogen)
(1)1-2 relay normally open contacts, (10A/220V/AC, 5A/30V/DC)
8
Power supply
(1)DC24V (2)AC220V (3)Power consumption ≤18W
9
Pipe material
(1)304 stainless steel (2)316 stainless steel
10
Pressure level
(1)P2=1.6MPa(standard)DN125~5000mm plug-in type (2)P2=1.6MPa(standard)DN25~150mm flange type, DN25~50mm threaded type (3) P3 = 2.5MPa (special) DN25 ~ 100mm flange type (4) P4 = 4.0MPa (special) DN25 ~ 100mm flange type
11
Header indication
Standard volume instantaneous flow, cumulative flow, standard flow rate, current output value, etc.
12
Protection level
p65
13
Measurement accuracy
±(1.5+0.5FS)%
14
Medium flow rate
Normal: 0.56~56 Nm/s, maximum flow rate can be extended to 100 Nm/s (extended range can be negotiated and ordered)
15
Remarks
The straight pipe section requires ≥20DN in front and ≥10DN in the back. For 90℃ elbows or expansion pipes, please refer to the instructions for details.
Flange dimensions
Nominal diameter DN
Pressure level MPa
Overall length L
Overall height H
Center hole diameter DO
Flange outer diameter D
Screw hole n-d
Thread specification
Flange thickness b
25
1.6
305
320
85
115
4×φ14
M12
16
32
1.6
310
324
100
140
4×φ18
M16
18
40
1.6
320
327
110
150
4×φ18
M16
18
50
1.6
396
332
125
165
4×φ18
M16
20
65
1.6
410
340
145
185
4×φ18
M16
20
80
1.6
420
348
160
200
8×φ18
M16
20
100
1.6
457
360
180
220
8×φ18
M16
22
125
1.6
500
372
210
250
8×φ18
M16
22
150
1.6
500
387
240
285
8×φ22
M20
24
Note 1: The table only gives the rated pressure data of 1.61pa. If the pressure is higher than the rated pressure, it is necessary to reach an agreement with the company's technical department before placing an order.
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