ZRN-LDC electromagnetic flowmeter

ZRN-LDC electromagnetic flowmeter

Product description:

ZRN-LDC series electromagnetic flowmeter is my company in Beijing REpower Instrument Technology Co., Ltd. uses advanced technology research and development of all intelligent electromagnetic flowmeter, its wholly Chinese electromagnetic converter core with high-speed CPU, computing speed, high precision, reliable performance. converter circuit design using international advanced technology, up to 10 input impedance15 Ohm, the common-mode rejection ratio better than 100db, can measure the flow rate of the fluid medium conductivity lower its sensor technology magnetic structure of a non-uniform magnetic field, the magnetic field is stable and reliable. Allows customers to 'buy the rest assured, with peace of mind, Services Heart 'is our company's goal.
The measurement principle is Faraday's law of electromagnetic induction, the sensor main components: the measuring tube, electrodes, excitation coil, core and yoke housing which is mainly used to measure the closed pipe conducting liquid and slurry volume flow included. acid, alkali, salt and other corrosive liquids. The company mainly produces a body electromagnetic flow meter and sub-body electromagnetic flow meter is widely used in petroleum, chemical, metallurgy, textile, food, pharmaceutical, paper and other industries as well as environmental protection, municipal management, water conservancy construction and other fields.
Flow measurement from the fluid density, affect the viscosity, temperature, pressure and electrical conductivity changes, the sensor sensing the voltage signal and a linear relationship between average velocity and therefore high accuracy.

Unimpeded flow measurement tube parts, so there is no additional pressure loss ; Measuring the pipe no moving parts, so very long sensor life.

Since the induced voltage signal is in the whole space is filled with a magnetic field formed, is the average of the surface pipe set, so the sensor straight pipe required for a shorter length of 5 Times the pipe diameter.

Only part of the sensor lining and electrode in contact with the measured liquid, as long as a reasonable choice of electrode and lining material can be resistant to corrosion and wear resistance.

ZRN-LDC converter uses the latest and most advanced microcontroller International (MCU) And surface mount technology (SMT) Reliable performance, high accuracy, low power consumption, zero stability, convenient parameter setting. Click the Chinese display LCD , Display the cumulative flow, instantaneous flow velocity, flow percentage and so on. ZRN-LDC electromagnetic flowmeter measurements in closed conduits for conducting liquid and slurry volume flow, such as clean water, sewage, various chemical salt solution, slurry, pulp, pulp and liquid foods such respect.

Bi-directional measurement system can measure forward flow, reverse flow. Using a special production process and quality materials to ensure product performance remains stable over the long term.

Electromagnetic Flowmeter Selection

Instrumentation instrument selection is very important work, the data indicate that the instrument in practical applications have 2/3 Selection of instrument failure is wrong or incorrect installation caused, please pay special attention.

Electromagnetic Flowmeter Selection Instructions correctly chosen electromagnetic flowmeter is a prerequisite to ensure the good use of electromagnetic flowmeters. Shiyao kind of electromagnetic flowmeter selection should be determined based on the physical and chemical properties of the measured fluid medium that bore electromagnetic flowmeter, flow range, lining materials, electrode materials and output current, etc., can meet the requirements of the measured fluid properties and the nature and flow of measurable fluid: From working principle of electromagnetic flowmeters, electromagnetic flowmeters can choose fluid flow measurement must be electrically conductive, strictly speaking, in addition to the high temperature fluid, any fluid as long as the conductivity is greater than 5μ / cm are chosen corresponding electromagnetic flowmeter to measure the flow rate, and therefore non-conductive material gas, steam, oil, acetone, etc. You can not use electromagnetic flowmeter to measure the flow rate determination sensor diameter: Flowmeter flow rate is preferably in the 0.3-15m / s range, this time in line with user selectable meter diameter pipe diameter using a flow rate of less than 0.3m / s. The best parts of the instrument when local increase in the flow rate, using shrink tube way: when the central cone angle diameter pipe is not more than 15oC, can be seen as the straight pipe diameter pipe portion of a body or a separate type of selection: Compact: live under better environmental conditions, generally use a body, namely the sensor and converter assembled into one.

Electrode material
Platinum alloy
Stainless steel coated with tungsten carbide
Lining material
Teflon F4
Poly FEP F46
Polyvinyl fluoride, ethylene co-FS
Poly recorded butadiene rubber
Polyurethane rubber
Level 1
4-20Madc, load ≤750Ω
0-3khz, 5v active, variable pulse width output high effective frequency
RS485 interface
High temperature
Ultra-high temperature type
220VAC ± 10%
24VDC ± 10%
A body structure
Sub-body structure
Explosion-proof body structure

Data collection

① measured fluid ingredients ② maximum flow, minimum flow ③ ④ maximum working pressure maximum temperature, minimum temperature

Range of electromagnetic flowmeters Q should be greater than the expected maximum flow rate, and the normal flow value slightly larger than the 50% full scale of the meter is appropriate.
Instrument Selection
• Confirm range
General industrial electromagnetic flowmeter measured medium flow rate 2 ~ 4m / s is appropriate, in exceptional circumstances, the minimum flow rate should not be less than 0.2m / s, the maximum should not exceed 8m / s.
If the medium contains solid particles, commonly used flow rate should be less than 3m / s, to prevent excessive friction lining and the electrodes; for viscous fluid velocity choose more than 2m / s.
Effect on the flow rate of greater help to electrode attachment automatically eliminate viscous material, helping improve the measurement accuracy.
Q has been determined in the range of conditions, you can determine the size of the diameter D of the flow meter based on the velocity V of the range, the value calculated by the following formula:
Q = πD2V / 4
Q: flow rate (/ h) D: pipe diameter V: velocity (m / h)
Q electromagnetic flowmeter range should be greater than the expected maximum flow rate value, and the normal flow value slightly larger than 50% of full scale flow meter is preferably

Installation Site Selection
In order to make stable and reliable electromagnetic flowmeter, when selecting the mounting location in attention to the following requirements:
1. Try to avoid ferromagnetic objects and devices with strong electromagnetic fields (large electric motors and transformers, etc.), so as not to affect the magnetic field and the magnetic flow sensor signal.
2. should be installed in dry and ventilated place, avoid the sun and rain, ambient temperature should be -20 ~ + 60 ℃, relative humidity less than 85%.
3. The meter should be ample space around, easy to install and maintain.
Electromagnetic flowmeter measurement principle does not depend on the flow characteristics, if there is a certain degree of turbulence inside the pipe and the vortex is generated in the non-measurement area (such as: elbows, tangential limiting or upstream half open valve) is the measurement If there is nothing to steady vortex it will affect the stability and measurement precision measurement, then you should take some measures to stabilize the velocity distribution in the measurement area:
. a increase in the length of straight pipe section before and after;
. b using a flow stabilizer;
c. to reduce the cross section of the measuring point.

Electrode materials selection:

Anti-corrosion properties
Application: 1, domestic water, industrial water, raw water wells, municipal sewage.
2, weak corrosive acid, alkali, salt solution
Hastelloy B
Applicable: 1, hydrochloric acid (concentration less than 10%), ammonium hydroxide concentration of the alkaline solution all
2, sodium hydroxide (concentration less than 50%), ammonium hydroxide concentration in the alkali solution all
3, phosphoric acid, an organic acid
NA: hydrochloric acid
Hastelloy C
Application: 1, mixed acid such as chromic acid and sulfuric acid mixed solution
2, an oxidizing salts such as Fe ++, Cu ++, seawater
NA: hydrochloric acid
Titanium (Ti)
Applicable: 1, salts, such as: (1) chloride (chloride / magnesium / aluminum / calcium / ammonium / titanium, etc.)
(2) the sodium, potassium, ammonium, hypochlorite, water
2, the hydrogen concentration is less than 50% of potassium chloride, ammonium hydroxide, barium hydroxide alkaline solution
NA: hydrochloric acid, sulfuric acid, phosphoric acid, hydrofluoric acid, an alkali cyanide barium oxide solution
Tantalum (Ta)
Application: 1, hydrochloric acid (concentration of less than 40%), sulfuric acid and concentrated sulfuric acid (not including oleum)
2, chlorine dioxide, magnesium chloride, hypochlorous acid, sodium cyanide, lead acetate
3, nitric acid (including fuming nitric acid), and other oxidizing acid, the temperature is below 80 ℃ in aqua regia
NA: alkali, hydrofluoric acid
Platinum (Pt)
Application: Almost all of the acid, alkali, salt solutions (including fuming sulfuric acid, fuming nitric acid)
NA: aqua regia, ammonium salt

Electromagnetic flowmeter liner material selection:

It should be based on the measured medium corrosive, abrasive and temperature to choose the lining material.

Lining material
The maximum operating temperature
For the liquid
Applicable caliber
Moderate abrasion resistance is generally low concentrations of acid salt corrosion
Water, industrial water, seawater
Poly ammonium fat rubber
Excellent wear resistance, acid and alkali poor performance
Pulp, pulp slurry, etc.
Fluorine plastic
Poly vinyl chloride
F4 or
Very stable chemical properties, resistance to boiling hydrochloric acid, sulfuric acid, aqua regia, concentrated alkali corrosion
Corrosive liquid acid salt
Tetrachlorethylene and hexafluoropropylene
Translation: Teflon FEP
F46 or
Chemical properties slightly inferior to F4
Corrosive liquid acid salt
Tetrachlorethylene and ethylene
F4 or ETFE
Chemical properties slightly inferior to F4
Corrosive liquid acid salt
Chemical stability
Polluted water
Hot water

Protection class selection:
1, IP65 : Anti-water type, from any direction to allow the tap water sensor, water pressure 30kPa, the amount of water 12.5L / S, distance 3m .

2, IP68: diving, long-term work in the water.

Protection rating should be selected according to the actual situation, the sensor mounted below ground, as is often affected by flooding should be used in IP68, the sensor is installed above ground should be used IP65.
Select additional functions
Basic intelligent electromagnetic flowmeter has a display, output 4-20mA and 0-1kHz alarm function, selected additional functions can be added according to the actual situation.
3, split installation: The sensor must be installed below ground level or other reasons, you should choose split installation.
4, RD-485
Communication: the need converters and other communications equipment, you need to choose RS-485 communication function.