Electromagnetic flowmeter
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Overview: the measuring principle of LD series electromagnetic flowmeter is Faraday's law of el…
Description
Overview: the measuring principle of 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 yoke housing. Electromagnetic flowmeters are mainly used to measure the volume flow of conductive liquids and grout in closed pipes. Including acid, alkali, salt and other corrosive liquid. Electromagnetic flowmeter 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. 1. The measurement is not affected by changes in fluid density, viscosity, temperature, pressure and conductivity; 2. No obstructing flow parts in the measuring tube, no pressure loss, low requirements for straight pipe section; 3. Series nominal sizes DN15 ~ DN3000. Sensor lining and electrode materials are available in a variety of options; 4. The converter adopts novel excitation method, low power consumption, zero point stability and high accuracy. Flow range up to 1500:1; 5. The converter can be integrated or separated from the sensor; 6. The converter adopts 16-bit high-performance microprocessor, 2x16LCD display, convenient parameter setting and reliable programming; 7. The electromagnetic flowmeter is a two-way measuring system with three integrators: forward total, reverse total and difference total; It can display. Zhuang, reverse flow, and with a variety of output: current, pulse, digital communication, HART; 8. The converter adopts surface mounting technology (T) with self-test and self-diagnosis functions; Main technical data: machine and sensor technical data
Execution standard | / T 9248-1999 | ||||
Nominal diameter | 15, 20, 25, 32, 40, 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 velocity | 15 m/s | ||||
The accuracy of | DNl5 to 24 ") | ± 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 | P 5 us/cm | ||||
Nominal pressure | 4.0 MPa | 1.6 MPa | 1.0 MPa | 0.6 MPa | 6.3, 10 mpa |
DNl5 ~ 6 | DNl5 to 24 ") | DN200 ~ DN1000 | DN700 ~ DN3000 | Special orders | |
The environment temperature | The sensor | - 25 ℃ - 10 to 60 ℃ | |||
Converter and one body | - 10 ℃ - 10 to 60 ℃ | ||||
The lining material | Polytetrethylene, polybutadiene rubber, polyurethane, polyvinyl propylene (F46), mesh PFA | ||||
High fluid temperature | - size | 70 ℃ | |||
The separation type | Polybutadiene rubber lining | 80 ℃; 120℃(indicated when ordering) | |||
Polyurethane lining | 80 ℃ | ||||
Polytetrethylene lining | 100 ℃; 150℃(indicated when ordering) | ||||
Polyvinyl propylene (F46) | |||||
And network PFA | |||||
Signal electrode and grounding electrode materials | Stainless steel 0Crl8Nil2M02Ti, haselloy C, haselloy B, titanium, tantalum, platinum/iridium alloy, stainless steel coated with tungsten carbide | ||||
Electrode scraper mechanism | 12 - DN3000 | ||||
Joint flange material | Carbon steel | ||||
Earth flange material | Stainless steel 1 crl8ni9ti | ||||
Import paolan materials | DN65 - DNl50 | Stainless steel 1 crl8ni9ti | |||
DN200 ~ DNl600 | Carbon steel ten stainless steel 1Crl8Ni9Ti | ||||
Enclosure protection | DNl5 ~ DN3000 separate rubber or polyurethane lined sensor | IP65 or IP68 | |||
Sensors, - type flow meters and separation type converters | IP65 | ||||
Spacing (separate type) | The converter is generally no more than 100m from the sensor | ||||
Converter technical data
The power supply | communication | 85-265 - v, 45-400 hz |
dc | 11-40 v | |
Operation keys and display | touch-tone | 4 thin film buttons can be set to select all parameters, or can be used to set the converter programming PC (RS232); Line 3 LCD wide viewing Angle, wide temperature, with backlight display; Row display flow value; Line 2 shows the unit of flow; The third line shows the flow percentage, forward total, reverse total, difference total, and flow rate. |
The magnetic key type | Two magnetic keys are used to select and reset the display parameters, and the converter is programmed by PC (RS232). Line: magnetic key selection: display flow percentage, forward total, reverse total, difference total, and flow rate. Line 2: display traffic. | |
Internal integrator | Forward total, reverse total and difference total. | |
The output signal | Unidirectional analog output | Fully isolated, load ≤600D. When (20 ma); Upper limit: 0-21ma optional, lmA per gear; Lower limit: 0-21ma optional, 1mA per gear; Forward and reverse flow output programming. |
Bidirectional analog output | The lower limit for. Or 4mA, same as one-way analog output. | |
Bidirectional pulse output | The two outputs correspond to the forward and reverse flow, respectively. The frequency is 0 ~ 800Hz, and the upper limit is 1 ~ 800Hz. Square wave or selected pulse width, upper limit of selected pulse width is 2.5s, 1ms per gear; Passive isolated transistor switch output, can absorb 250mA current, withstand 35V. | |
Dual output | (programmable) high/low flow rate, atc, fault state, forward, reverse flow rate, analog overrange, pulse overrange, pulse small signal removal, output polarity optional; Transistor switch output with isolation protection, can absorb 250mA current, withstand 35V.(not isolated from pulse output) | |
Digital communications | RS232, RS485, HART | |
Choice of lining
The lining material | The main performance | High dielectric temperature | Scope of application | |
- size | The separation type | |||
Polytetrethylene (F4) | It is a kind of plastic with stable chemical properties, which can withstand boiling, sulfuric acid, ****** * and aqua regia, as well as strong alkali and various solvents. It is not resistant to corrosion of chemical, high temperature chemical, high velocity liquid, liquid oxygen and self-oxygen. | 70 ℃ | 100℃ 150℃ (special order required) | 1. Strong corrosive media such as concentrated acid and alkali. 2. Sanitary media. |
Polyvinyl propylene (F46) | With F4, the wear resistance and negative pressure resistance were higher than F4. | Same as above | ||
Polymerized vinyl (Fs) | Applicable temperature upper limit is lower than polytetrethylene, but the cost is also lower. | 80 ℃ | ||
Butadiene rubber | 1, some elastic, high tearing force, good wear resistance. 2, the general low concentration of acid, alkali, salt medium corrosion, not resistant to the corrosion of oxidizing media. | 80℃ 120℃ (special order required) | Water, sewage, low abrasion mud slurry. | |
Polyurethane rubber | 1, wear resistance is very strong. 2. Poor corrosion resistance. | 80 ℃ | Neutral wear of pulp, coal pulp, mud | |
Selection of inlet flange and ground flange (or ground ring)
The flange type | Comfortable with van |
Ground flange (or ground ring) | Suitable for non-conductor pipes, such as plastic pipes, but sensors with ground electrodes are not required. |
Import flange | Choose when the medium has a strong abrasion. |
Electrode selection
Electrode materials | Corrosion and wear resistance |
Stainless steel 0 crl8nil2m02ti | Used in industrial water, domestic water, sewage and other weakly corrosive media, suitable for petroleum, chemical, steel and other industrial sectors, municipal, environmental protection and other fields. |
Hastelloy B | Has good corrosion resistance to all concentrations below the boiling point, but also resistant to sulfuric acid, acid, hydrogen acid, acid and other non-chemical acid, alkali, non-oxidizing salt solution corrosion. |
Hastelloy C | Resistance to non-oxidizing acids, such as ******, mixed acid, or chromic acid and sulfuric acid mixed medium corrosion, also resistant to oxidizing salts such as: Fe, ", "Cu" or containing oxidizing agent corrosion, such as higher than normal temperature of the secondary acid solution, seawater corrosion |
titanium | Ability to resist corrosion of seawater, various compounds and subacid, oxidizing acid (including fuming sulfuric acid), acid and alkali. It is not resistant to corrosion of pure reducing acid (such as sulfuric acid,), but when the acid contains oxidant (such as ******, f ++, c++), the corrosion is greatly reduced. |
tantalum | It has excellent corrosion resistance similar to glass. In addition to hydrogen acid, fuming sulfuric acid, alkali, almost resistant to - - cutting chemical medium (including boiling point, ****** * and l sulfuric acid below 50℃) corrosion. Diao in alkali; Corrosion resistant. |
Platinum/titanium alloy | Almost capable of cutting chemical media, but not suitable for aqua regia and ammonium salts. |
Stainless steel coated with tungsten carbide | For non - corrosive, wear - resistant media. |
Note: due to the wide variety of media, its corrosion and temperature, concentration, flow rate and other complex factors, the table is only for reference. Users should make their own choice according to the actual situation, and when necessary, should do the corrosion resistance test of the selected material, such as the hanging test. | |
Type selection of LD series electromagnetic flowmeter: measurement range: confirm the general industrial electromagnetic flowmeter with the measured medium flow rate of 2 ~ 4m/s is appropriate, in special cases, the low flow rate should not be less than 0.2m/s, the high should not be more than 8m/s. If the medium contains solid particles, the usual flow rate should be less than 3m/s to prevent excessive friction between the lining and the electrode. For viscous fluid, the flow rate can be selected to be greater than 2m/s. The larger flow rate is conducive to the effect of viscous material attached to the automatic electrode, which is conducive to improving the measurement accuracy. Under the condition of the range of Q have been identified, according to the velocity V can be decided to the size of the flow meter diameter D, the range of the values calculated by the next type: Q = PI D2V / 4 Q: flow (㎡ / h) D: pipe diameter V: velocity (m/h) electromagnetic flowmeter range of Q flow value should be greater than expected, the flow of the normal value in a full scale slightly greater than the flowmeter calibration 50 is advisable. ◆ LD series electromagnetic flowmeter reference flow range
Diameter in mm | Flow range m3/h | Diameter in mm | Flow range m3/h |
Phi is 15 | 0.06 ~ 6.36 | Phi 450 | 57.23 ~ 5722.65 |
Phi 20 | 0.11 ~ 11.3 | Phi 500 | 70.65 ~ 7065.00 |
Phi is 25 | 0.18 ~ 17.66 | Phi 600 | 101.74 ~ 10173.6 |
Phi 40 | 0.45 ~ 45.22 | Phi 700 | 138.47 ~ 13847.4 |
Phi 50 | 0.71 ~ 70.65 | Phi 800 | 180.86 ~ 18086.4 |
Phi 65 | 1.19 ~ 119.4 | Phi 900 | 228.91 ~ 22890.6 |
Phi 80 | 1.81 ~ 180.86 | Phi 1000 | 406.94 ~ 40694.4 |
Phi 100 | 2.83 ~ 282.60 | Phi 1200 | 553.90 ~ 55389.6 |
Phi 150 | 6.36 ~ 635.85 | Phi 1600 | 723.46 ~ 72345.6 |
Phi 200 | 11.3 ~ 1130.4 | Phi 1800 | 915.62 ~ 91562.4 |
Phi 250 | 17.66 ~ 176.25. | Phi 2000 | 1130.4 ~ 113040.00 |
Phi 300 | 25.43 ~ 2543.40 | Phi 2200 | 1367.78 ~ 136778.4 |
Phi 350 | 34.62 ~ 3461.85 | Phi 2400 | 1627.78 ~ 162777.6 |
Phi 400 | 45.22 ~ 4521.6 | Phi 2600 | 1910.38 ~ 191037.6 |
LDE series intelligent electromagnetic flowmeter spectrum selection
model | CAL | ||||||||
LD | 15~2600 | ||||||||
Code name | Type of installation | ||||||||
Y | one-piece | ||||||||
F | Split type | ||||||||
Code name | Converter model | ||||||||
ZA | circular | ||||||||
ZB | square | ||||||||
Code name | The output signal | ||||||||
4 I. | 4 ~ 20 ma | ||||||||
f | The frequency of 1 KHZ | ||||||||
The Rs | Serial communication (485) | ||||||||
C | Control the output | ||||||||
Code name | Explosion-proof requirements | ||||||||
N | No explosion-proof | ||||||||
The EX | Explosion proof (for split type only) | ||||||||
Code name | Medium temperature | ||||||||
T1 | 65 ℃ or less | ||||||||
T2 | 120 ℃ or less | ||||||||
T3 | ≤180℃(for split-type only) | ||||||||
Code name | Lining material | ||||||||
NE | Butadiene rubber (≤65℃) | ||||||||
PTFE | Polytetrethylene (≤189℃) | ||||||||
PVC | Polyethylene (≤70℃) | ||||||||
Code name | The electrode material | ||||||||
316 l | Stainless steel | ||||||||
HC | Hastelloy C | ||||||||
HB | Hastelloy B | ||||||||
Ti | titanium | ||||||||
Ta | tantalum | ||||||||
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