LD series electromagnetic flowmeter

NegotiableUpdate on 01/21

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Overview

Product features: The measurement principle of Shanghai Xuanxu LD series electromagnetic flowmeter is Faraday's law of electromagnetic induction. The main components of the sensor are: measuring tube, electrode, excitation coil, iron core and magnetic yoke housing

Product Details

Product features: The measurement principle of the Shanghai Xuanxu LD series electromagnetic flowmeter is Faraday's law of electromagnetic induction. The main components of the sensor are the measuring tube, electrode, excitation coil, iron core, and magnetic yoke housing. It is mainly used to measure the volumetric flow rate of conductive liquids and slurries in closed pipelines.

Detailed information on LD series electromagnetic flowmeter:

Shanghai Xuanxu LD series electromagnetic flowmeter

summary:

LDThe measurement principle of the series electromagnetic flowmeter is Faraday's law of electromagnetic induction. The main components of the sensor are the measuring tube, electrode, excitation coil, iron core, and magnetic yoke housing. It is mainly used to measure the volumetric flow rate of conductive liquids and slurries in closed pipelines. Including highly corrosive liquids such as acids, alkalis, salts, etc. This product is widely used in industries such as petroleum, chemical, metallurgical, textile, food, pharmaceutical, papermaking, as well as in municipal management, water conservancy construction, and other fields.

Product Features:
1. Measurement is not affected by changes in fluid density, viscosity, temperature, pressure, and conductivity;
2. Measure the flow components inside the tube, with no pressure loss and low requirements for straight pipe sections;
3. Series nominal diameter DN15~DN3000. There are multiple options for sensor lining and electrode materials;
4. The converter adopts a novel excitation method, with low power consumption, low point stability, and high accuracy. The flow range can reach 1500:1;
5. The converter can be integrated or separated from the sensor;
6. The converter adopts a 16 bit high-performance microprocessor, 2x16 LCD display, convenient parameter setting, and reliable programming;
7. The flowmeter is a bidirectional measurement system equipped with three integrators: forward total, reverse total, and differential total; Can display. Zhuang, reverse flow, and have multiple outputs: electric
Flow, pulse, digital communication HART；
8. The converter adopts surface mount technology (SMT) and has self checking and self diagnostic functions;

Main technical data:
Technical data of the whole machine and sensors

execution standard	JB／T 9248—1999
Nominal Diameter	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
High flow velocity	15m／s
accuracy	DNl5～DN600	Indication: ± 0.3% (flow rate ≥ 1m/s); ± 3mm/s (flow rate<1m/s)
	DN700—DN3000	± 0.5% of the indicated value (flow rate ≥ 0.8m/S); ± 4mm/s (flow rate<0.8m/S)
Fluid conductivity	≥5uS／cm
Nominal Pressure	4.0MPa	1.6MPa	1.0MPa	0.6MPa	6.3、10MPa
	DNl5～DN150	DNl5～DN600	DN200～DN1000	DN700～DN3000	special order
ambient temperature	sensor	—25℃—60 ℃
	Converter and integrated model	—10℃—60 ℃
Lining material	Polytetrafluoroethylene, chloroprene rubber, polyurethane, perfluoroalkoxy (F46), mesh PFA
Very high fluid temperature	—body type	70℃
	separated type	Polychloroprene rubber lining	80℃120 ℃ (specify when ordering)
		Polyurethane lining	80℃
		PTFE lining	100℃150 ℃ (specify when ordering)
		Perfluoroethylene propylene (F46)
		Mesh PFA
Signal electrode and ground electrode materials	Stainless steel 0Crl8Nil2M02Ti, Hastelloy C, Hastelloy B, titanium, tantalum, platinum/iridium alloy, stainless steel coated with tungsten carbide
Electrode scraper mechanism	DN300—DN3000
Connecting flange material	carbon steel
Grounding flange material	Stainless steel 1Cr18Ni9Ti
Imported protective flange materials	DN65—DNl50		Stainless steel 1Cr18Ni9Ti
	DN200～DNl600		Carbon steel and stainless steel 1Cr18Ni9Ti
Shell protection	DNl5DN3000 separable rubber or polyurethane lined sensor			IP65Or IP68
	Other sensors, body type flow meters, and separate converters			IP65
Distance (separated type)	The distance between the converter and the sensor is generally not more than 100m

Converter technology data

power supply	communication	85—265V，45—400Hz
power supply	direct current	11—40V
Operation keys and display	push-button	Four thin film buttons can be used to set and select all parameters, and the converter can also be programmed using a PC (RS232); 3-line LCD with wide viewing angle, wide temperature, and backlit display; The first line displays the traffic value; The second line displays the flow unit; The third line displays the percentage of traffic, total forward, total reverse, total difference, alarm, and flow rate.
Operation keys and display	Magnetic key type	Two magnetic keys are used for selecting and resetting display parameters, and the converter is programmed using a PC (RS232); 2-line LCD display with wide viewing angle, wide temperature, and backlight: Line 1: Magnetic key selection: Display flow percentage, forward total amount, reverse total amount, difference total amount, alarm, and flow rate. Line 2: Display traffic.
Internal integrator	Positive total, negative total, and differential total.
output signal	Unidirectional analog output	Fully isolated, load ≤ 600D. (at 20mA); Upper limit: 0-21mA optional, 1mA per level; Lower limit: 0-21mA optional, 1mA per level; programming for forward and reverse flow output modes.
	Bidirectional analog output	The lower limit is. Or 4mA, other same unidirectional analog outputs.
	Bidirectional pulse output	Two outputs correspond to forward and reverse flow rates, with a frequency range of 0-800Hz and an upper limit of 1-800Hz to choose from. Each IHz level is available; Square wave or selected pulse width, with an upper limit of 2.5S and 1ms per step; passive isolation transistor switch output, capable of absorbing 250mA current and withstanding 35V voltage.
	Dual channel alarm output	Programmable alarm for high/low flow rate, air traffic control, fault status, positive/negative flow rate, analog over range, pulse over range, pulse small signal cutoff, with optional output polarity; Transistor switch output with isolation protection, capable of absorbing 250mA current and withstanding 35V voltage (not isolated from pulse output)
Digital Communication		RS232，RS485，HART

Selection of lining

Lining material	Main performance	High medium temperature		Scope of Application
Lining material	Main performance	—body type	separated type
Polytetrafluoroethylene (F4)	It is a chemically stable plastic that can withstand boiling hydrochloric acid, sulfuric acid, nitric acid, and aqua regia, as well as concentrated alkali and various organic solvents. Corrosion caused by intolerance, high temperature, high flow rate liquid fluorine, liquid oxygen, and self oxygen.	70℃	100℃ 150℃ （Special order required)	1Strong corrosive media such as concentrated acid and alkali. 2. Sanitary media.
Perfluoroethylene propylene (F46)	Same as F4, its wear resistance and negative pressure resistance are higher than F4.		Ditto.
Polyfluoroethylene (Fs)	The upper limit of applicable temperature is lower than that of polytetrafluoroethylene, but the cost is also lower.		80℃
Polychloroprene rubber	1Some have elasticity, high tensile strength, and good wear resistance. 2. Resistant to corrosion in general low concentration acid, alkali, and salt media, but not resistant to corrosion in oxidizing media.		80℃ 120℃ （Special order required)	Water, sewage, and weakly abrasive slurry.
polyurethane rubber	1Wear resistance performance. 2Poor corrosion resistance.		80℃	Neutral strong abrasion slurry, coal slurry, mud

Selection of imported protective flanges and grounding flanges (or grounding rings)

Type of flange	Scope of application
Grounding flange (or grounding ring)	Suitable for non-conductive pipelines such as plastic pipes, but sensors with grounding electrodes do not require them.
Import protection flange	Choose when the medium has strong wear resistance.

Selection of electrodes

electrode material	Corrosion resistance and wear resistance
Stainless steel 0Crl8Nil2M02Ti	Used for weakly corrosive media such as industrial water, domestic water, and sewage, suitable for industrial sectors such as petroleum, chemical, and steel, as well as municipal and other fields.
哈氏合金B	It has good corrosion resistance to all concentrations of hydrochloric acid below boiling point, as well as to non chlorinated acids, bases, and non oxidizing salt solutions such as sulfuric acid, phosphoric acid, hydrofluoric acid, and organic acids.
Hastelloy C	Can withstand corrosion from non oxidizing acids such as nitric acid, mixed acids, or mixed media of chromic acid and sulfuric acid, as well as corrosion from oxidizing salts such as Fe, ', Cu', or other oxidants such as hypochlorite solutions above room temperature and seawater
Titanium	Capable of withstanding corrosion from seawater, various chlorides and hypochlorites, oxidizing acids (including fuming sulfuric acid), organic acids, and alkalis. Not resistant to the corrosion of relatively pure reducing acids (such as sulfuric acid, hydrochloric acid), but if the acid contains oxidants (such as nitric acid, Fc++, Cu++), the corrosion is greatly reduced.
Tantalum	It has excellent corrosion resistance and is very similar to glass. Except for hydrofluoric acid, fuming sulfuric acid, and alkali, it can almost withstand corrosion from cutting chemical media (including boiling point hydrochloric acid, nitric acid, and sulfuric acid below 50 ℃). Dig in alkali; Corrosion resistance.
Platinum/titanium alloy	Almost capable of cutting chemical media, but not suitable for aqua regia and ammonium salts.
Stainless steel coated with tungsten carbide	Used for non corrosive and highly abrasive media.
Note: Due to the wide variety of media and the complex factors such as temperature, concentration, and flow rate that affect their corrosiveness, this table is for reference only. Users should make their own choices based on the actual situation, and if necessary, conduct corrosion resistance tests on the selected materials, such as hanging plate tests.

Selection of LD series electromagnetic flowmeter instruments

◆ Range confirmation

Generally, the flow rate of the measured medium in industrial electromagnetic flow meters should be between 2-4m/s. In special cases, the flow rate should not be less than 0.2m/s for very low flow rates and not more than 8m/s for very high flow rates. If the medium contains solid particles, the commonly used flow rate should be less than 3m/s to prevent excessive friction between the lining and the electrode; For viscous fluids, the flow velocity can be chosen to be greater than 2m/s. A higher flow velocity helps to automatically eliminate the effect of viscous substances attached to the electrode, which is beneficial for improving measurement accuracy.

Under the condition that the range Q has been determined, the size of the flowmeter diameter D can be determined based on the range of flow velocity V mentioned above, and its value can be calculated by the following formula:

Q=πD2V/4
Q: Flow rate (㎡/h) D: Inner diameter of pipeline V: Flow rate (m/h)

The range Q of the electromagnetic flowmeter should be greater than the expected large flow value, while the normal flow value should be slightly greater than 50 of the flowmeter's full range scale.

◆ LD electromagnetic flowmeter reference flow range

Caliber mm	Flow range m3/h	Caliber mm	Flow range m3/h
φ15	0.06~6.36	φ450	57.23～5722.65
φ20	0.11～11.3	φ500	70.65～7065.00
φ25	0.18～17.66	φ600	101.74～10173.6
φ40	0.45～45.22	φ700	138.47～13847.4
φ50	0.71～70.65	φ800	180.86～18086.4
φ65	1.19～119.4	φ900	228.91～22890.6
φ80	1.81～180.86	φ1000	406.94～40694.4
φ100	2.83～282.60	φ1200	553.90～55389.6
φ150	6.36～635.85	φ1600	723.46～72345.6
φ200	11.3～1130.4	φ1800	915.62～91562.4
φ250	17.66～176.25.	φ2000	1130.4～113040.00
φ300	25.43～2543.40	φ2200	1367.78～136778.4
φ350	34.62～3461.85	φ2400	1627.78～162777.6
φ400	45.22～4521.6	φ2600	1910.38～191037.6

Selection spectrum of LDE series intelligent electromagnetic flowmeter

model	caliber
LD	15~2600
		code name	Installation type
		Y	integrated
		F	split-type
			code name	Converter model
			ZA	rotundity
			ZB	square
				code name	output signal
				I.4	4~20mA
				f	Frequency 1KHz
				Rs	Serial communication (485)
				C	controlled output
					code name	Explosion-proof requirements
					N	No explosion-proof
					EX	Explosion proof (only applicable to split type)
						code name	medium temperature
						T1	≤65℃
						T2	≤65℃
						T3	≤180℃（Only applicable to split type)
							code name	Lining material
							NE	Chloroprene rubber (≤ 65 ℃)
							PTFE	Polytetrafluoroethylene (≤ 189 ℃)
							PVC	Polyvinyl chloride (≤ 70 ℃)
								code name	electrode material
								316L	stainless steel
								HC	Hastelloy C
								HB	哈氏合金B
								Ti	Titanium
								Ta	Tantalum