The thermal gas mass flow meter is designed based on the principle of thermal diffusion, which uses the constant temperature difference method to accurately measure the gas. The utility model has the advantages of small volume, high digitization degree, convenient installation and accurate measurement.
Features：
Thermal gas mass flow meters have the following technical advantages:
►The real mass flow meter does not require temperature and pressure compensation for gas flow measurement, and the measurement is convenient and accurate. A mass flow rate of the gas or a standard volume flow can be obtained.
►Wide range ratio, can measure gas flow rate up to 120Nm / s down to 0.1Nm / s, can be used for gas leak detection.
►The seismic performance is good and the service life is long. The sensor has no moving parts and pressure sensing parts and is immune to the influence of vibration on the measurement accuracy.
►Easy to install and maintain. Non-stop production installation and maintenance can be achieved where field conditions permit. (requires special customization)
►Digital design. The overall digital circuit measurement, accurate measurement and convenient maintenance.
►RS-485 communication enables factory automation and integration.
►Oxygen, nitrogen, hydrogen, chlorine and multi-component gas measurements.
►blast furnace gas, coke oven gas measurement.
►Gas flow measurement of natural gas, liquefied gas, flare gas, etc.
►Primary and secondary air flow measurements of blast furnaces in the power plant.
►Flow measurement of downhole ventilation or exhaust system in Yanzhou Mine.
►Flue gas measurement.
►Compressed air measurement.
Technical performance
|
performance |
Technical Parameters |
|
|
structure type |
Plug-in |
Pipeline |
|
Measuring medium |
Common steady-state gases (unstable media such as acetylene and boron trichloride are not measurable) |
|
|
Pipe diameter range |
DN65～4000mm |
DN15～2000mm |
|
Flow rate range |
0.1～120Nm/s |
|
|
Accuracy |
±1～2.5% |
|
|
Operating temperature |
sensor：-40～+450℃ converter：-20～+45℃ |
|
|
Working pressure |
Medium pressure≤4.0MPa(≥4.0MPa Agreement supply) |
Medium pressure≤1.6MPa(≥4.0MPa Agreement supply) |
|
Power supply |
(DC 24V )>=12W |
|
|
Responding speed |
1s |
|
|
Output signal |
4-20mA(1500V Optical isolation,Maximum load500ohm),RS-485(1500V Optical isolation) |
|
|
Call the police |
1-2 normally open contacts |
|
|
Type of supply |
Integrated structure |
|
|
Pipe material |
Carbon steel, stainless steel, plastic, etc. |
|
|
Live display |
Four-line LCD display |
|
|
Display content |
Mass flow rate, standard volume flow rate, cumulative flow rate, standard flow rate, etc. |
|
|
Protection level |
IP65,IP67,IP68 |
|
|
Sensor material |
stainless steel |
Stainless steel, carbon steel |
Pipe and plug-in structure dimensions
Flange mounting size
Unit：mm
GB/T9119-2000 PN1.6Mpa(16bar) Flat, protruding panel flat welded steel pipe flange
|
Nominal diameter |
Flange outer diameter |
Center hole diameter |
Screw hole |
Thread specification |
Flange thickness |
Instrument installation length |
|
DN |
D |
K |
n*L |
|
C |
L |
|
15 |
95 |
65 |
4*14 |
M12 |
12 |
160 |
|
20 |
105 |
75 |
4*14 |
M12 |
14 |
160 |
|
25 |
115 |
85 |
4*14 |
M12 |
14 |
160 |
|
32 |
140 |
100 |
4*18 |
M16 |
16 |
160 |
|
40 |
150 |
110 |
4*18 |
M16 |
16 |
180 |
|
50 |
165 |
125 |
4*18 |
M16 |
18 |
180 |
|
65 |
185 |
145 |
4*18 |
M16 |
20 |
180 |
|
80 |
200 |
160 |
8*18 |
M16 |
20 |
180 |
|
100 |
220 |
180 |
8*18 |
M16 |
20 |
200 |
|
125 |
250 |
210 |
8*18 |
M16 |
20 |
200 |
|
150 |
285 |
240 |
8*22 |
M20 |
22 |
200 |
|
200 |
340 |
295 |
12*22 |
M20 |
22 |
200 |
|
250 |
405 |
355 |
12*26 |
M24 |
24 |
200 |
|
300 |
460 |
410 |
12*26 |
M24 |
24 |
200 |
Wafer mounting dimensions
Unit：mm
|
Figure 3 |
Caliber DN |
B |
C (CH) |
A |
|
15-25 |
55 |
390(455) |
70 |
|
|
32 |
55 |
390(455) |
70 |
|
|
40 |
80 |
385(440) |
85 |
|
|
50 |
90 |
390(450) |
85 |
|
|
65 |
105 |
400(470) |
85 |
|
|
80 |
120 |
420(480) |
85 |
|
|
100 |
140 |
440(500) |
85 |
|
|
125 |
165 |
465(530) |
90 |
|
|
150 |
194 |
490(560) |
100 |
|
|
200 |
248 |
545(610) |
102 |
|
|
250 |
300 |
595(650) |
115 |
|
|
300 |
350 |
645(710) |
130 |
|
|
|
|
|
|
(1)For DN15 ~ DN80 can be usedpipe thread connection.
(2)Only the maximum rated pressure data of 1.6Mpa is given in the table, and it can be customized above the rated pressure.
(3)The integral full tube can be flanged, threaded and snap-fit.
Plug-in mounting size
Unit：mm
Figure 4
(1)The integral plug-in type should be inserted into the axis of the pipe to be tested, so the length of the measuring rod depends on the diameter of the measuring pipe. It should be stated when ordering.
(2)If it cannot be inserted into the pipe axis, the factory will provide the calibration factor to complete the accurate measurement.
Flow Range
Thermal gas mass flow meter range table
|
caliber |
Base range (air) (Nm3/h) |
Extended range (air) (Nm3/h) |
Oxygen base range (Nm3/h) |
Combustible gas range(Nm3/h) |
|
10 |
0.5-28 |
0.03-30 |
0.5-14 |
0.5-5 |
|
15 |
0.5-65 |
0.07-65 |
0.5-32 |
0.5-10 |
|
20 |
0.5-100 |
0.12-110 |
0.5-55 |
0.5-20 |
|
25 |
0.5-175 |
0.18-180 |
0.5-89 |
0.5-28 |
|
32 |
0.5-290 |
0.3-290 |
0.5-144 |
0.5-45 |
|
40 |
0.5-450 |
0.5-450 |
0.5-226 |
0.5-70 |
|
50 |
1-600 |
0.5-700 |
0.7-352 |
0.7-110 |
|
65 |
1.5-1000 |
1-1200 |
1.2-600 |
1.2-185 |
|
80 |
2-1500 |
1.5-1800 |
2-900 |
2-280 |
|
100 |
3-2300 |
3-2800 |
3-1420 |
3-470 |
|
125 |
4.5-3500 |
4-4400 |
4.5-2210 |
4.5-700 |
|
150 |
6.5-5200 |
6-6300 |
6.5-3200 |
6.5-940 |
|
200 |
12-9000 |
12-11500 |
12-5650 |
12-1880 |
|
250 |
18-14500 |
18-17500 |
18-8830 |
18-2820 |
|
300 |
25-21000 |
25-25000 |
25-12720 |
25-4060 |
|
350 |
35-28000 |
35-34500 |
35-17000 |
35-5600 |
|
400 |
45-36500 |
45-45000 |
45-22600 |
45-7200 |
|
450 |
60-46500 |
60-57000 |
60-29000 |
60-9200 |
|
500 |
70-57000 |
70-70000 |
70-35300 |
70-11280 |
|
600 |
100-81000 |
100-101000 |
100-50600 |
100-16300 |
|
700 |
140-110000 |
140-138000 |
140-69000 |
140-22100 |
|
800 |
180-150000 |
180-180000 |
180-90000 |
180-29000 |
|
900 |
230-185000 |
230-230000 |
230-115000 |
230-36500 |
|
1000 |
290-230000 |
290-280000 |
290-140000 |
290-45500 |
|
2000 |
1150-900000 |
1150-1130000 |
1150-560000 |
1150-185000 |
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