Electromagnetic Flow meter

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Electromagnetic Flow meter

Summary
The electromagnetic flowmeter is composed of two parts by electromagnetic flow sensor and electromagnetic flow converter.The operation of an electromagnetic flowmeter is based on Faraday law of electromagnetic induction.The mainly parts of the sensor are: measuring tube,electrode poles,excitation coil,iron core,yoke and housing. The measuring tube of the sensor is a short alloy tube whose diameter is D, the inner surface of it has an insulating liner.Two electrodes are fixed in the measuring tube along with the diameter direction of it and they usually flush with the inner surface liner.When excitation coil pulsed by two-way square wave,there generates a working magnetic field with a flux density B in the vertical direction of the measurement axis.In the meantime,if some electrical conductivity liquid flows at an average velocity V through the measuring tube ,cuts lines of the magnetic field,there generates induced electromotive force E.Electromotive force E is directly proportional to the product of flux density B、measuring tube diameter D and average velocity V,that's: E BVD. Electromotive force E(flow signal) is measured by the electrodes and transmitted to transducer through cable.After the transducer handles the flow signal by magnifying it, the flow and total amount can be displayed,also will output pulse and analog current etc.
Main technical parameters

◆ Technical parameters of whole flowmeter and sensor

Chart 1
Carried Standard	ANSI/DIN/JIS
DN	3.6.10.15.20.25.32.40.50.65.80.100.125.150.200.250.300.350.400.450.500. 600.700.800.900.1000.1200.1400.1600.1800.2000.2200.2400.2600.2800.3000
Max.Flow Velocity	15m/s
Accuracy	±0.5% of indicating value(flow velocity 0.8m/s); ±4mm/s(flow velocity＜0.8m/s )
Fluid Conductivity	≥5uS/cm
Nominal Pressure	4.0MPa	1.6MPa	1.0MPa	0.6MPa		6.3,10MPa etc.
	DN3~DN150	DN15~DN600	DN200~DN1000	DN700~DN3000		Special Ordering
Lining Material	PTFE,Poly neoprene,Polyurethane,F46,PFA with net
	Sensor		-25 deg.C~+60 deg.C
	Convertor and integrated type		-10 deg.C~+60 deg.C
Fluid Max.Temperature	Integrated type	70 deg.C
	Separated type	Poly Neoprene Lining		80 deg.C;120 deg.C(notes in order)
		Polyurethane Lining		80 deg.C
		PTFE Lining		100 deg.C;150 deg.C(notes in order)
		FEP Teflon
		PFA with net
Material of signal electrode and ground electrode	SS316L,HastelloyB,HastelloyC,Ti,Ta,Platinum-iridium alloy,Stainless steel coating with tungsten carbide
Electrode drawknife apparatus	DN80～DN3000
Connection flange material	Carbon steel
Connection ring material	Stainless steel1Cr18Ni9Ti
Enclosure protection	ND15~DN3000 separated sensor with rubber or PU lining				IP65 or IP68
	Integrated(rounded converter)				IP65
	Other sensors and separated converter				IP65
	Explosion proof sensor and converter				IP65
Spacing(separated type)	Normally the separation distance between converter and sensor is less than 100m,if more please order specially.(Note: our company provide 10m length standardly,if need more, please indicate the length in order, and the cost will be add more)
Output of analog current	0~10mA load resistance 0~1.5Ω
	4~20mA load resistance 0~750Ω
Frenquency output	1~5000Hz
Pulse output	Separated type output by two way: forward and reverse flow; integrated type output one way
	Frenquency range:0~5KHz,uper limit 1~5 optionally
	Square wave or pulse with 25ms pulse width
	Transistor switch output with isolation protection,can absorb 250mA current and withstanding 35V voltage
Two-path alarm output	Alarmable(programable)high/low flow,blank pipe,fault condition,forward and reverse flow,simulation volume exceeds range,pulse volume exceeds range,disconnect pulse small signal
	Transistor switch output with isolation protection,can absorb 250mA current and withstanding 35V voltage(Not isolated with pulse output)
Digital communications	RS232,RS485,HART(add specially)
Explosion proof mark	Integration ExdeiaⅡCT4
	Separated Exd[ia] ⅡCT4(converter) ExdeiaⅡCT4(sensor)

[Type Selection]
LDG □ □□□ □□ □ □ □ □ □ □□ □ □□
│ │ │ │ ││ ││ │ │ │
a b c d e f g h i j k

a. Connect type A Flange connection B Clamping connection	e. electrode material 1.Stainless steel 0Cr18Ni12Mo2Ti 2.HastelloyB 3.HastelloyC 4.Titanium 5.Platinum-iridum alloy 6.Tantalum
b. Nominal bore(mm) Code DN Code DN Code DN 015 15 250 250 10A 1000 020 20 300 300 12A 1200 025 25 350 350 14A 1400 040 40 400 400 16A 1600 050 50 450 450 18A 1800 065 65 500 500 20A 2000 100 100 600 600 22A 2200 150 150 700 700 24A 2400 200 200 800 800 26A 2600 900 900 28A 2800 30A 3000
	f. Shell protection 1.IP65 2.IP68+IP65(IP68sensor+IP65converter)(c only can select 2,3;g only select 0;i only select CR;K only select 01,02) 3.IP67(c only select 2,3;g only select 0;i only select CH; k only select 02)
	g. Explosion-proof mark 0.Nothing 1.Integrated type (f only select 1,k only select 03) 2.Separated type (f only select1,k only select 02)
Nominal pressure(MPa) 06 0.6 (DN700~DN3000) 10 1.0 (DN15~DN1000) 16 1.6 (DN15~DN600) 40 4.0 (DN15~DN150) xx for special order
	h.Accessory Nothing Grounding electrode(DN25~DN3000) Grounding ring(DN15~DN3000) Electrode scraper structure(DN80~DN3000)
	i. Structure CR Divided type CH Integrated type
	j. Power supply 1.85~265V AC 45~400Hz 2.16~40V DC 3.Lithium battery
lining material 1.FTFE(F4) (DN15~DN1000) 2.Polychloroprene (DN15~DN3000) 3.Polyurethane (DN15~DN600) 4.FEP(F46) (DN15~DN250) 5.screened PFA (DN50~DN250)
	k. Converter type 01.Square separated type/single current/dipluse/double knock 02.Round separated type/single current/dipluse/double knock 03.Round integrated type/single current/single pulse/double knock 04.Square integrated type/single current/single pulse/double knock Notes: 1. Communication protocol: RS232,RS485.HART optional 2.Batch control function optional 3.GPRS remote monitoring function optional