Thermal Mass Flow Meter from China Manufacturer

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Thermal mass flow meter

Natural gas flow meter

Introduction

Application

Technical Data

Installation

Introduction

Flange thermal gas mass flow meter is one of kind mass flow meter which
Is popular in industrial applications is the way they are designed and built. The feature is no moving parts, nearly unobstructed straight through flow path, require no temperature or pressure corrections and retain accuracy over a wide range of flow rates. Straight pipe runs can be reduced by using dual-plate flow conditioning elements and installation is very simple with minimal pipe intrusions.
Flange thermal gas mass flow meter size from DN10~DN2000mm

Advantages

Flange thermal gas mass flow meter advantanges :
(1)Wide range ratio 1000:1;
(2)Large diameter, low flow rate, negligible pressure loss;
(3)Direct mass flow measurement without temperature and pressure compensation;
(4)Very sensitive for low flow rate measurement;
(5)Easy to design and select, easy to install and use;
(6)Suitable for all kinds of single or mixed gas flow measurement Could measure gas with flow velocity from 100Nm/s to 0.1Nm/s, which can be used for gas leak detection;
(7) The sensor has no moving parts and pressure sensing parts, and is not affected by vibration on the measurement accuracy. It has good seismic performance and high measurement reliability;
(8) No pressure loss or very small pressure loss.
(9) When measuring the gas flow, it is often expressed in the volume flow unit under the standard state, and the medium temperature/pressure change hardly affects the measured value. If the density is constant in the standard state (that is, the composition is unchanged), it is similar to a mass flow meter;
(10) Support multiple communication methods, such as RS485 communication, MODBUS protocol, etc., which can realize factory automation and integration

Application

Flange thermal gas mass flow meter application:
Thermal gas air flow meter widely use for Electric power, Petrochemical industry, Glass, Ceramics and Building materials industry, and mainly be used to meausre Dry gas, such as Air, Natural gas, LPG gas, Biogas, ect. But thermal gas mass flow couldn'd be used to measure Vapour, Humidity gas and Ethyne.

Electric Power

Petrochemical

Glass

Ceramics

Building Materials

Meausre Dry Gas

Technical Data

Table 1: Flange Thermal Gas Mass Flow Meter Parameter

Measuring Medium	Various of Gas (Except acetylene)
Pipe Size	(Insert connection) DN50-DN2000mm ,In-line connection(DN10-DN2000mm)
Velocity	0.1-100Nm/s
Accuracy	+/-1~2.5%
Working Temperature	Sensor:-40~+220 degC Transmitter:-20~+45 degC
Working Pressure	Insertion Sensor:medium pressure ≤1.6Mpa Flanged Sensor:medium pressure ≤4.0Mpa Special pressure please double check
Power Supply	Compact type: 24VDC or 220VAC, Power consumption ≤18W Remote type:220VAC,Power consumption ≤19W
Response Time	1s
Output	4-20mA(optoelectronic isolation,maximum load 500Ω),Pulse RS485(optoelectronic isolation) and HART
Alarm Output	1-2 line Relay, Normally Open state, 10A/220V/AC or 5A/30V/DC
Sensor Type	Standard Insertion, Hot-tapped Insertion and Flanged
Construction	Compact and Remote
Pipe Material	Carbon Steel, Stainless Steel,Plastic etc.
Display	4 lines LCD Mass flow, Volume flow in standard condition, Flow totalizer, Date and Time, Working time, and Velocity, etc.
Protection	IP65

Table 2: Flange Thermal Gas Mass Flow Meter Sizing

Nominal Diameter	Flange outer diameter	Center hole	Bolt hole	Screw Threads	Sealing face		Flange thickness	Installation length
DN	D	k	n x L	Screw Threads	d	f	C	L
15	95	65	4x14	M12	46	2	14	280
20	105	75	4x14	M12	56	2	16	280
25	115	85	4x14	M12	65	2	16	280
32	140	100	4x18	M16	76	2	18	350
40	150	110	4x18	M16	84	2	18	350
50	165	125	4x18	M16	99	2	20	350
65	185	145	4x18	M16	118	2	20	400
80	200	160	8x18	M16	132	2	20	400
100	220	180	8x18	M16	156	2	22	500

Table 3: Common Use Gas Maximum Range

Caliber ( mm )	Air	Nitrogen ( N2 )	Oxygen ( O2 )	Hydrogen ( H2 )
15	65	65	32	10
25	175	175	89	28
32	290	290	144	45
40	450	450	226	70
50	700	700	352	110
65	1200	1200	600	185
80	1800	1800	900	280
100	2800	2800	1420	470
125	4400	4400	2210	700
150	6300	6300	3200	940
200	10000	10000	5650	1880
250	17000	17000	8830	2820
300	25000	25000	12720	4060
350	45000	45000	22608	5600
400	70000	70000	35325	7200
450	100000	100000	50638	9200
500	135000	135000	69240	11280
600	180000	180000	90432	16300
700	220000	220000	114500	22100
800	280000	280000	141300	29000
900	400000	400000	203480	36500
1000	600000	600000	318000	45000
2000	700000	700000	565200	18500

Table 4: Flange Thermal Gas Mass Flow Meter Model Selection

Model	QTMF	X	X	X	X	X	X	X
Caliber	DN15-DN4000
Structure	Compact	C
	Remote	R
Senor type	Insertion		I
	Flange		F
	Clamp		C
	Screw		S
Material	SS304			304
	SS316			316
Pressure	1.6Mpa				1.6
	2.5Mpa				2.5
	4.0Mpa				4.0
Teperature	-40-200℃					T1
	-40-450℃					T2
Power Supply	AC85~250V						AC
	DC24~36V						DC
Signal Output	4-20mA+Pulse+RS485							RS
	4-20mA+Pulse+HART							HT

Installation

Flange thermal gas mass flow meter installation:
① Observe the recommended inlet and outlet requirements.
② Good engineering practice is necessary for the associated pipe work and installation.
③ Ensure correct alignment and orientation of the sensor.
④ Take measures to reduce or avoid condensation (e.g. install a condensation trap, thermal insulation, etc.).
⑤ The maximum permitted ambient temperatures and the medium temperature range must be observed.
⑥ Install the transmitter in a shaded location or use a protective sun shield.
⑦ For mechanical reasons, and in order to protect the pipe, it is advisable to support heavy sensors.
⑧ No installation in where large vibration exists
⑨ No exposure in the environment containing a lot of corrosive gas
⑩ No sharing power supply with frequency converter, electric welding machine and other machines which can make power-line interference.

Daily maintenance for flange thermal gas mass flow meter:
In the daily operation of the thermal gas mass flowmeter, check and clean the flowmeter, tighten the loose parts, find and deal with the abnormality of the flowmeter in operation in time, ensure the normal operation of the flowmeter, reduce and delay the wear of components, Extend the service life of the flowmeter. Some flowmeters will become fouling after being used for a period of time, and it must be cleaned by pickling etc. depending on the degree of fouling