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HQLDE small caliber electromagnetic flowmeter
Brief introduction: HQLDE small caliber electromagnetic flowmeter consists of two parts: sensor and converter. It works based on Faraday's law of elec
Product details
Brief introduction:
The HQLDE small caliber electromagnetic flowmeter consists of two parts: a sensor and a converter. It works based on Faraday's law of electromagnetic induction and is used to measure the volumetric flow rate of conductive liquids with a conductivity greater than 5 μ S/cm. It is an inductive instrument for measuring the volumetric flow rate of conductive media. In addition to measuring the volumetric flow rate of general conductive liquids, it can also be used to measure the volumetric flow rate of strong corrosive liquids such as strong acids and alkalis, as well as homogeneous liquid-solid two-phase suspensions such as mud, slurry, and pulp. Widely used in industrial sectors such as petroleum, chemical, metallurgical, textile, papermaking, environmental protection, food, as well as municipal management, water conservancy construction, river dredging and other fields for flow measurement.
3、 Technical parameters of small-diameter electromagnetic flowmeter1、 Introduction to small caliber electromagnetic flowmeter:
Miniature electromagnetic flowmeter is a professional flowmeter for measuring small flow rates, designed specifically for measuring alkaline and acidic liquids with harsh conditions such as wastewater treatment dosing, water treatment, petrochemical, and pharmaceutical industries. Ultra low flow meter measurement, with no movable parts on the pulsating flow meter side; Don't worry about mechanical malfunctions. The HQLDE small caliber electromagnetic flowmeter consists of two parts: a sensor and a converter. It works based on Faraday's law of electromagnetic induction and is used to measure the volumetric flow rate of conductive liquids with a conductivity greater than 5 μ S/cm. It is an inductive instrument for measuring the volumetric flow rate of conductive media. In addition to measuring the volumetric flow rate of general conductive liquids, it can also be used to measure the volumetric flow rate of strong corrosive liquids such as strong acids and alkalis, as well as homogeneous liquid-solid two-phase suspensions such as mud, slurry, and pulp. Widely used in industrial sectors such as petroleum, chemical, metallurgical, textile, papermaking, environmental protection, food, as well as municipal management, water conservancy construction, river dredging and other fields for flow measurement.
2、 Product characteristics of small caliber electromagnetic flowmeter
All digital processing, strong anti-interference ability, reliable measurement, high accuracy, and a flow measurement range of up to 150:1
Ultra low EMI switching power supply, suitable for a wide range of power supply voltage changes, with good EMI resistance performance.
Adopting a 16 bit embedded microprocessor, it has fast computing speed, high accuracy, programmable low-frequency rectangular wave excitation, improved stability of flow measurement, and low power consumption.
Using SMD devices and surface mount technology, the circuit has high reliability.
There are no movable parts or flow blocking components inside the pipeline, and there is almost no additional pressure loss during measurement.
On site, the range can be modified online according to the actual needs of the user.
The measurement results are independent of physical parameters such as flow velocity distribution, fluid pressure, temperature, density, viscosity, etc.
High definition backlit LCD display, fully Chinese menu operation, easy to use, simple to operate, easy to learn and understand.
It has digital communication signal outputs such as RS485, RS232, Hart, and Modbus. (Optional)
It has self checking and self judging functions.
Hourly total volume recording function, recording the total flow volume in hours, suitable for time-sharing measurement system (optional)
There are three integrators inside that can display the forward cumulative amount, reverse cumulative amount, and difference cumulative amount respectively. There is also a non power outage timer inside that can record 16 power outage times. (Optional)
Infrared handheld operator, 115KHZ communication speed, all functions of long-distance non-contact operation converter (optional)
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Nominal diameter (mm) (Special specifications can be customized) |
Pipeline type: DN4 to DN10 |
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Flow direction: |
Positive, negative, net traffic |
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Range ratio: |
150：1 |
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Repetitive error: |
± 0.1% of the measured value |
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Accuracy level: |
Pipeline type: 0.5 level, 1.0 level |
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Temperature of the tested medium: |
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PTFE lining: -30 to+100 ℃ |
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Rated working pressure: (High voltage can be customized) |
DN4－DN8：≤1.6MPa |
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Flow rate range: |
0.1－15m/s |
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Conductivity range: |
The conductivity of the measured fluid is ≥ 5 μ s/cm |
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Current output: |
load resistance |
0～10mA：0～1.5kΩ |
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4～20mA：0～750 kΩ |
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Digital frequency output: |
The upper limit of the output frequency can be set within 1-5000Hz with a transistor collector open circuit bidirectional output with photoelectric isolation. When the external power supply is ≤ 35V and conducting, the maximum current at the collector is 250mA |
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Power supply: |
AC220V, DC24V or 3.6V batteries |
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Require the length of the straight pipe section |
Upstream ≥ 5DN, downstream ≥ 2DN |
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Connection method: |
The flowmeter and piping are connected by flanges, and the flange connection size should comply with the provisions of GB11988 |
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Explosion proof grade: |
mdIIBT4 |
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Protection level: |
IP65， Specially customized up to IP68 |
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Environmental temperature: |
－25～＋60℃ |
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Relative temperature: |
5%～95% |
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Total power consumption: |
Less than 20W |
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4、 Selection of Micro Caliber Electromagnetic Flow Meter Instruments
1. Selection code:
5、 Selection of caliber and flow rate for micro caliber electromagnetic flowmeter
| model | Explanation | |||||||||||||
| HQLDE— | internet traffic | □ | -□ | □ | □ | □ | □ | □ | -□ | □ | □ | □ | □ | |
| HQLDR— | heat | □ | -□ | □ | □ | □ | □ | □ | -□ | □ | □ | □ | □ | |
| Path diameter | 10-2200mm | |||||||||||||
| Combination | S | Integrated type | ||||||||||||
| L | Split type | |||||||||||||
| Electrode material | M | Stainless steel | ||||||||||||
| T | Ti (titanium) | |||||||||||||
| D | Ta (tantalum) | |||||||||||||
| H | Hastelloy alloy | |||||||||||||
| P | Pt platinum | |||||||||||||
| N | Ni nickel | |||||||||||||
| A | Tungsten carbide (wear-resistant) | |||||||||||||
| Output method | 0 | No output | ||||||||||||
| 1 | 4-20mA/1-5KHz | |||||||||||||
| 2 | 4-20mA | |||||||||||||
| Lining material | X | Rubber | ||||||||||||
| F | Polytetrafluoroethylene | |||||||||||||
| P | F46 (high temperature) | |||||||||||||
| J | PFA (wear-resistant) | |||||||||||||
| T | ceramics | |||||||||||||
| On site display | 0 | No on-site display | ||||||||||||
| 1 | On site display | |||||||||||||
| Communication method | 0 | No communication | ||||||||||||
| 1 | RS485 | |||||||||||||
| 2 | RS232 | |||||||||||||
| 3 | Mobdus | |||||||||||||
| 4 | Hart | |||||||||||||
| Grounding | 0 | No grounding ring | ||||||||||||
| 1 | There is a grounding ring | |||||||||||||
| 2 | There is a grounding electrode | |||||||||||||
| Maximum traffic limit | （n） | Upper limit flow rate (range) m3/h | ||||||||||||
| Work pressure | A | 0.6MPa | ||||||||||||
| B | 1.0 MPa | |||||||||||||
| C | 1.6 MPa | |||||||||||||
| D | 2,5 MPa | |||||||||||||
| measurement accuracy | 1 | 0.2 | ||||||||||||
| 2 | 0.5 | |||||||||||||
| 3 | 1 | |||||||||||||
| medium temperature | L | 0-80 degrees | ||||||||||||
| H | 0-150 degrees | |||||||||||||
| power supplier | DC | 24V DC power supply | ||||||||||||
| AC | 220V AC power supply | |||||||||||||
5、 Selection of caliber and flow rate for micro caliber electromagnetic flowmeter
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Nominal Diameter(mm)
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Measurable flow range（L/h）
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Effective measurement of flow range（L/h）
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4
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13~450
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9~670
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6
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30~1000
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20~1500
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8
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55~1800
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36~2700
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6、 Selection of lining for small-diameter electromagnetic flowmeter:
7、 Selection of electrode materials for small-diameter electromagnetic flowmeter:
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Lining material |
Performance |
scope of application |
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chloroprene rubber Neoprene |
Good wear resistance, excellent elasticity, high tensile strength, and resistance to corrosion from low concentration acid-base salt media, but not resistant to corrosion from oxidizing media. |
<80 ° C, general water, sewage, mud, slurry |
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polyurethane Polyurethane |
Has excellent wear resistance, but slightly inferior acid and alkali resistance. |
<60 ° C, neutral and strongly worn mineral slurry, coal slurry, and mud. |
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PTFE PTFE |
A material with the most stable chemical properties, capable of withstanding boiling hydrochloric acid, sulfuric acid, nitric acid, aqua regia, concentrated alkali, and various organic solvents, but not resistant to chlorine trifluoride and high-temperature oxygen difluoride. |
<180 ° C, strong corrosive media such as concentrated acid and alkali, sanitary media. |
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F46 |
Chemical stability, electrical insulation, lubricity, non adhesiveness, and non flammability are similar to PTFE, but F46 material has better strength, aging resistance, temperature resistance, and low-temperature flexibility than PTFE. Good adhesion to metal, better wear resistance than PTFE, with good performance |
<180 ° C, hydrochloric acid, sulfuric acid, aqua regia, and strong oxidants, sanitary media |
7、 Selection of electrode materials for small-diameter electromagnetic flowmeter:
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material |
Corrosion Resistance |
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316L |
For nitric acid, sulfuric acid at room temperature<5%, boiling phosphoric acid, alkaline solution; Under certain pressure, media such as sulfurous acid, seawater, and acetic acid have strong corrosion resistance. |
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Hastelloy HB |
Resistant to all concentrations of non oxidizing acids, bases, and non chlorinated hydrochloric acids such as hydrochloric acid, sulfuric acid, hydrofluoric acid, and organic acids at boiling point. |
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Hastelloy HC |
Resistant to oxidizing acids such as nitric acid, mixed acids, or mixtures of chromic acid and sulfuric acid, as well as oxidizing salts and seawater |
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titanium |
It can withstand corrosion from seawater, various chlorides and hypochlorites, oxidizing acids (including fuming nitric acid), organic acids, alkalis, etc. It is not resistant to corrosion from relatively pure reducing acids (sulfuric acid, hydrochloric acid), but corrosion is greatly reduced when the acid contains oxidants (such as nitric acid and media containing Fe and Cu ions). |
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tantalum |
It has excellent corrosion resistance similar to glass, except for hydrofluoric acid and concentrated sulfuric acid, and can withstand corrosion from almost all chemical media (including boiling point hydrochloric acid, nitric acid, and sulfuric acid below 175 ° C). It is not resistant to corrosion in alkali. |
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