Insertion Thermal Mass Flow Meter

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Thermal mass flow meter

Natural gas flow meter

Introduction

Application

Technical Data

Installation

Introduction

Insertion type 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.
Insertion type thermal gas mass flow meter size from DN40~DN2000mm.

Advantages

Insertion type 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) Plug-in installation method, installation and maintenance without stopping production, easy to use and maintain;
(11) Support multiple communication methods, such as RS485 communication, MODBUS protocol, etc., which can realize factory automation and integration

Application

Insertion type thermal gas mass flow meter application:
Thermal gas air flow meter widely use for Electric power,water treatment,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't be used to measure Vapour,Humidity gas and Ethyne.

Electric Power

Petrochemical

Glass

Ceramics

Building Materials

Meausre Dry Gas

Technical Data

Table 1: Insertion Thermal Gas Mass Flow Meter Parameter

Measuring Medium	Various of Gas (Except acetylene)
Pipe Size	(Insert connection) DN40-DN2000mm
Velocity	0.1-100Nm/s
Accuracy	inline: ±1.0%， insertion： ±1.5%
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: Insertion Thermal Gas Mass Flow Meter Sizing

Table 3: Common Use Gas Maximum Range

Caliber ( mm )	Air	Nitrogen ( N2 )	Oxygen ( O2 )	Hydrogen ( H2 )
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: Thermal Gas Mass Flow Meter Model Selection

Model	QTMF	X	X	X	X	X	X	X
Caliber	DN10-DN4000 (3/8"-158")
Structure	Compact		C
	Remote		R
Explosion Proof	Ex d IIC T6 Gb			EX
	Without			W
Material	SS304				304
	SS316				316
	others				O
Connection	Flange (DN10~DN300mm)		PN10/PN16/PN25/PN40(DIN)			D**
			A15:150#, A30:300# (ANSI)			A**
			10K/20K/30K/40K (JIS)			J**
	Tri-clamp (DN10~DN100mm)					C
	Thread (DN10~DN100mm)					T
	Insertion (DN32~DN4000mm)					I
Power Supply	AC85~250V						AC
	DC24~36V						DC
Signal Output	4-20mA+Pulse+RS485							RS
	4-20mA+Pulse+HART							HT

Installation

Insertion type thermal gas mass flow meter installation:
① Regardless of whether the flowmeter is installed vertically or horizontally, keep the flowmeter in a horizontal state.
② In situations where accidental gas stop or accidental gas stop will inevitably cause major irreversible losses, bypass must be installed.
③ There should be at least a 10D straight pipe section in the front of the flowmeter and a 5D (D is the pipe diameter) straight pipe section at the rear.
④ If the instrument is installed outdoors, a sunshade should be added to avoid the sun and rain.
⑤ Make sure that there is no strong magnetic field, strong electric field and strong mechanical vibration near the flowmeter.
⑥ The static grounding of the flowmeter should be reliable, but it cannot be shared with strong current grounding.
⑦ The surrounding environment should confirm that there is no corrosive effect on aluminum alloy.
⑧ Ensure that the gas flow direction is consistent with the arrow direction on the flowmeter.
⑨ Welding operations are prohibited in an explosive environment.

Insertion type thermal gas mass flow meter maintenance:
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