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Product details
A solution flowmeter is an electromagnetic flowmeter that uses Faraday's law of electromagnetic induction to measure various conductive liquids in pipelines. It is corrosion-resistant, anti-interference, and displays instantaneous and cumulative flow rates, as well as signal output functions. Because it can measure the flow rate of various liquids, we refer to it as a solution flowmeter here. The following is a detailed explanation of a solution flowmeter.
1、 Product features, uses, and scope of application
characteristic:
●LDThe series solution flowmeter has the following characteristics:
●The linear measurement principle can achieve high-precision measurement without being affected by changes in fluid density, viscosity, temperature, pressure, and electrical resistivity;
●There is no obstruction in the measuring tube, with low pressure loss and low requirements for straight pipe sections;
●Nominal DiameterDN6-DN2000Wide coverage range, multiple options for lining and electrodes, capable of meeting the requirements for measuring various conductive fluids;
●The converter adopts programmable low-frequency rectangular wave excitation, which improves the stability of flow measurement and reduces power loss;
●The converter adopts16Embedded microprocessor with full digital processing, fast computing speed, strong anti-interference ability, reliable measurement, high accuracy, and a flow measurement range of up to1500：1；
●High definition backlightLCDDisplay, full Chinese character menu operation, easy to use, simple to operate, easy to learn and understand;
●haveRS485perhapsRS232ODigital communication signal output;
●It has conductivity measurement function, can distinguish whether the sensor is empty, and has self checking and self diagnostic functions;
●useSMDDevice and surface installation（SMT）High reliability of technology and circuits;
●Can be used in corresponding explosion-proof situations.
Main purpose
OW-LDA series of solution flow meters can be used to measure the volumetric flow rate of conductive fluids in closed pipelines. Widely used for flow measurement and control in industrial and agricultural production processes such as petrochemicals, steel metallurgy, water supply and drainage, water conservancy irrigation, water treatment, environmental wastewater measurement and control, papermaking, pharmaceuticals, food, etc.
Environmental conditions for use
Environmental temperature: sensor-25℃～+60℃ converter-10℃～+60℃
Relative temperature:5%-95%
working conditions
Maximum fluid temperature: All-In-One 70℃,Separate type: PTFE lining 150℃,Chloroprene rubber lining 80℃,Polyurethane rubber lining 70℃
Fluid conductivity:≥5uS/cm
2、 Working principle
The working principle of the solution flowmeter is based on Faraday's electromagnetic induction law. When a conductor moves in a magnetic field, an induced electromotive force is generated at both ends of the conductor perpendicular to the direction of the magnetic field and the direction of motion. The magnitude of electromotive force is directly proportional to the speed of conductor motion and the magnetic induction intensity of the magnetic field.
When the conductive fluid flows at an average velocityV（m/s）By installing a pair of measuring electrodes with an inner diameter ofD（m）When flowing inside the insulated conduit, the pipeline is in a uniform magnetic induction intensity ofB（T）In a magnetic field, an induced electromotive force will be generated on a pair of electrodesE（V）Its direction is perpendicular to the direction of the magnetic field and fluid.
Faraday's law of electromagnetic induction is:E=B•D•V（1）
The volumetric flow rate of the flow rate is: （2）
By formula（1）And（2）We can obtain:m3/h)（3）
Therefore, the electromotive force can be expressed as: （4）
equalBWhen it is a constant, for a fixed apertureDIt is also a known number, formula（3）In the middle=K(a constant), then the formula（3）Can be rewritten as:QV=K•E（m3/h)（5）
From the formula（5）It can be seen that the trafficQVRegarding electromotive forceEDirectly proportional.
Converter circuit structure
On the one hand, the electromagnetic flow converter provides stable excitation current to the excitation coil of the electromagnetic flow sensor,REACHBIt's a constant,Simultaneously amplify the electromotive force sensed by the sensor\Convert to standard current signal or frequency signal,Easy to display traffic,Control and regulation.
3、 Product type and composition
Product composition
The solution flow meter consists of two main parts: an electromagnetic flow converter and an electromagnetic flow sensor. The separated type also requires a dedicated double-layer shielded cable to connect the converter and sensor. Solution flow meters are divided into two structural forms: integrated and separated. Can be used in designated explosion-proof locations. Sensors have7Electrodes made of different materials and4Various lining materials are available for selection.
1、 Product features, uses, and scope of application
characteristic:
●LDThe series solution flowmeter has the following characteristics:
●The linear measurement principle can achieve high-precision measurement without being affected by changes in fluid density, viscosity, temperature, pressure, and electrical resistivity;
●There is no obstruction in the measuring tube, with low pressure loss and low requirements for straight pipe sections;
●Nominal DiameterDN6-DN2000Wide coverage range, multiple options for lining and electrodes, capable of meeting the requirements for measuring various conductive fluids;
●The converter adopts programmable low-frequency rectangular wave excitation, which improves the stability of flow measurement and reduces power loss;
●The converter adopts16Embedded microprocessor with full digital processing, fast computing speed, strong anti-interference ability, reliable measurement, high accuracy, and a flow measurement range of up to1500：1；
●High definition backlightLCDDisplay, full Chinese character menu operation, easy to use, simple to operate, easy to learn and understand;
●haveRS485perhapsRS232ODigital communication signal output;
●It has conductivity measurement function, can distinguish whether the sensor is empty, and has self checking and self diagnostic functions;
●useSMDDevice and surface installation（SMT）High reliability of technology and circuits;
●Can be used in corresponding explosion-proof situations.
Main purpose
OW-LDA series of solution flow meters can be used to measure the volumetric flow rate of conductive fluids in closed pipelines. Widely used for flow measurement and control in industrial and agricultural production processes such as petrochemicals, steel metallurgy, water supply and drainage, water conservancy irrigation, water treatment, environmental wastewater measurement and control, papermaking, pharmaceuticals, food, etc.
Environmental conditions for use
Environmental temperature: sensor-25℃～+60℃ converter-10℃～+60℃
Relative temperature:5%-95%
working conditions
Maximum fluid temperature: All-In-One 70℃,Separate type: PTFE lining 150℃,Chloroprene rubber lining 80℃,Polyurethane rubber lining 70℃
Fluid conductivity:≥5uS/cm
2、 Working principle
The working principle of the solution flowmeter is based on Faraday's electromagnetic induction law. When a conductor moves in a magnetic field, an induced electromotive force is generated at both ends of the conductor perpendicular to the direction of the magnetic field and the direction of motion. The magnitude of electromotive force is directly proportional to the speed of conductor motion and the magnetic induction intensity of the magnetic field.
When the conductive fluid flows at an average velocityV（m/s）By installing a pair of measuring electrodes with an inner diameter ofD（m）When flowing inside the insulated conduit, the pipeline is in a uniform magnetic induction intensity ofB（T）In a magnetic field, an induced electromotive force will be generated on a pair of electrodesE（V）Its direction is perpendicular to the direction of the magnetic field and fluid.
Faraday's law of electromagnetic induction is:E=B•D•V（1）
The volumetric flow rate of the flow rate is: （2）
By formula（1）And（2）We can obtain:m3/h)（3）
Therefore, the electromotive force can be expressed as: （4）
equalBWhen it is a constant, for a fixed apertureDIt is also a known number, formula（3）In the middle=K(a constant), then the formula（3）Can be rewritten as:QV=K•E（m3/h)（5）
From the formula（5）It can be seen that the trafficQVRegarding electromotive forceEDirectly proportional.
Converter circuit structure
On the one hand, the electromagnetic flow converter provides stable excitation current to the excitation coil of the electromagnetic flow sensor,REACHBIt's a constant,Simultaneously amplify the electromotive force sensed by the sensor\Convert to standard current signal or frequency signal,Easy to display traffic,Control and regulation.
3、 Product type and composition
Product composition
The solution flow meter consists of two main parts: an electromagnetic flow converter and an electromagnetic flow sensor. The separated type also requires a dedicated double-layer shielded cable to connect the converter and sensor. Solution flow meters are divided into two structural forms: integrated and separated. Can be used in designated explosion-proof locations. Sensors have7Electrodes made of different materials and4Various lining materials are available for selection.
4、 Technical performance indicators of the product
1Hospitality standards:JB/T9248-1999
2Maximum flow rate:15m/s
3Nominal diameter:DN3、6、10、15、20、25、32、40、50、65、80、100、150、200、250、300、350
400、450、500、600、700、800、900、1000、1200、1400、1600、1800、2000
4Accuracy:0.5%、0.2%
5Nominal pressure:4.0MPA(DN10-150)
1.6MPA(DN200-600)
1.0MPA(DN700-1200)
0.6MPA(DN1400-2000)
Other specifications and standards can be customized according to user requirements.
6Materials:
Electrode form and material
The electrode forms can be divided into standard type, scraper type, detachable type, and grounded electrode.
The electrode and grounding electrode materials include molybdenum containing stainless steel and Hastelloy alloyBHastelloy alloyCTitanium, tantalum, platinum alloy, stainless steel coated with tungsten carbide7Seed.
Flange material: Carbon steel
Grounding ring material: stainless steel
Entry protection ring material: stainless steel, carbon steel.
7Shell protection:
IP65：
IP68Only sensors with separated chloroprene rubber and polyurethane lining, and do not include explosion-proof structures.
8Explosion proof standard:
DN15-DN600Integrated explosion-proof:md II BT4
DN15-DN1600Separate explosion-proof, sensors and converters are installed in corresponding hazardous areasmd II BT4
DN15-DN1600Separated explosion-proof, sensors installed in corresponding hazardous areas, converters installed in safe areas:md II BT4
9Connecting cables: For the separated solution flowmeter, signal cables are used to connect the sensor and converter, and the longest cable length should be less than100MMOur company provides free of charge with the watch10MCable, the insufficient part needs to be ordered.
10Converter performance:
Power supply: single-phase AC power85-265V，45-63HZThe power is less than20WDC power supply11-40VD•C
Converter display and programming operations:4A thin film button can be used to set and select all parameters, and an external controller can also be usedPCMachine（RS485、RS232）Programming converter settings, high-definition backlightLCDDisplay, air traffic control detection, self diagnostic function.
Digital Communication:RS485、RS232、MODBUS、REMOTEIt has lightning protection.
Output signal:
Current output: bidirectional two-way, fully isolated0-10mA/4-20 mALoad resistance:0-10 mAcorrect0-1.5KOhm,4-20mAAt that time0-750Ohm.
Frequency output: forward and reverse flow output, with an upper limit of output frequency that can be within1-5000 HZSet within the scope. Bipolar output of transistor collector with photoionization. External power supply not exceeding35VWhen conducting, the maximum collector current is250 mA.
Pulse output: forward and reverse flow output, with an output pulse upper limit of up to5000cp/sThe pulse equivalent is0.001L-1.0m3/cP.The pulse width is automatically set to20msOr square waves. Open circuit output of transistor collector with photoelectric isolation. External power supply not exceeding35VWhen conducting, the maximum collector current ismA.
Flow direction indication output: This flowmeter can measure the fluid flow rate in both positive and negative directions. And it can determine the direction of fluid flow. Output when displaying positive flow rate as specified+10VHigh level, reverse fluid flow output0VLow level.
Alarm output: Two transistor collector open circuit alarm outputs with photoelectric isolation. External power supply not exceeding35VWhen conducting, the maximum collector current is250mAAlarm status: Fluid empty pipe, excitation disconnection, flow rate exceeding limit.
Damping time: in0-100SThe interval is optional.
The intelligent converter has a self diagnostic function. Except for power and hardware circuit failures, faults that occur in general applications can provide accurate alarm information. These information are displayed in the upper right corner of the monitor“！”The exclamation mark, when in measurement mode, displays the following fault content by flipping through the page with the down button:
Normal traffic
Excitation alarm
Air traffic control alarm
Supply completeness
Supply solution flow meters according to the order contract.
The random files include: one user manual, one product certificate, and one packing list.
Transportation and storage
To prevent damage to the instrument during operation, please maintain the packaging status as shipped from the manufacturer before arriving at the installation site. When storing, the storage location should be indoors with the following conditions:
ARainproof and moisture-proof;
BMechanical vibration is minimal and shock is avoided;
CTemperature range-20+60℃The humidity is not greater than80%.
run
Before putting the flowmeter into operation, the following checks should be carried out:
AIs there any damage to the flowmeter during transportation and installation;
BWhether the voltage of the power supply matches the voltage on the nameplate;
CThe instrument is wired correctly.
After inspection, open the pipeline valve to fill the pipeline with liquid, and pay attention to eliminating leaks and residual gases in the system. Then connect the instrument power supply, and generally preheat the flowmeter by powering it on10It will work normally in minutes. If there are any problems during operation, please contact our company.
1Hospitality standards:JB/T9248-1999
2Maximum flow rate:15m/s
3Nominal diameter:DN3、6、10、15、20、25、32、40、50、65、80、100、150、200、250、300、350
400、450、500、600、700、800、900、1000、1200、1400、1600、1800、2000
4Accuracy:0.5%、0.2%
5Nominal pressure:4.0MPA(DN10-150)
1.6MPA(DN200-600)
1.0MPA(DN700-1200)
0.6MPA(DN1400-2000)
Other specifications and standards can be customized according to user requirements.
6Materials:
Electrode form and material
The electrode forms can be divided into standard type, scraper type, detachable type, and grounded electrode.
The electrode and grounding electrode materials include molybdenum containing stainless steel and Hastelloy alloyBHastelloy alloyCTitanium, tantalum, platinum alloy, stainless steel coated with tungsten carbide7Seed.
Flange material: Carbon steel
Grounding ring material: stainless steel
Entry protection ring material: stainless steel, carbon steel.
7Shell protection:
IP65：
IP68Only sensors with separated chloroprene rubber and polyurethane lining, and do not include explosion-proof structures.
8Explosion proof standard:
DN15-DN600Integrated explosion-proof:md II BT4
DN15-DN1600Separate explosion-proof, sensors and converters are installed in corresponding hazardous areasmd II BT4
DN15-DN1600Separated explosion-proof, sensors installed in corresponding hazardous areas, converters installed in safe areas:md II BT4
9Connecting cables: For the separated solution flowmeter, signal cables are used to connect the sensor and converter, and the longest cable length should be less than100MMOur company provides free of charge with the watch10MCable, the insufficient part needs to be ordered.
10Converter performance:
Power supply: single-phase AC power85-265V，45-63HZThe power is less than20WDC power supply11-40VD•C
Converter display and programming operations:4A thin film button can be used to set and select all parameters, and an external controller can also be usedPCMachine（RS485、RS232）Programming converter settings, high-definition backlightLCDDisplay, air traffic control detection, self diagnostic function.
Digital Communication:RS485、RS232、MODBUS、REMOTEIt has lightning protection.
Output signal:
Current output: bidirectional two-way, fully isolated0-10mA/4-20 mALoad resistance:0-10 mAcorrect0-1.5KOhm,4-20mAAt that time0-750Ohm.
Frequency output: forward and reverse flow output, with an upper limit of output frequency that can be within1-5000 HZSet within the scope. Bipolar output of transistor collector with photoionization. External power supply not exceeding35VWhen conducting, the maximum collector current is250 mA.
Pulse output: forward and reverse flow output, with an output pulse upper limit of up to5000cp/sThe pulse equivalent is0.001L-1.0m3/cP.The pulse width is automatically set to20msOr square waves. Open circuit output of transistor collector with photoelectric isolation. External power supply not exceeding35VWhen conducting, the maximum collector current ismA.
Flow direction indication output: This flowmeter can measure the fluid flow rate in both positive and negative directions. And it can determine the direction of fluid flow. Output when displaying positive flow rate as specified+10VHigh level, reverse fluid flow output0VLow level.
Alarm output: Two transistor collector open circuit alarm outputs with photoelectric isolation. External power supply not exceeding35VWhen conducting, the maximum collector current is250mAAlarm status: Fluid empty pipe, excitation disconnection, flow rate exceeding limit.
Damping time: in0-100SThe interval is optional.
The intelligent converter has a self diagnostic function. Except for power and hardware circuit failures, faults that occur in general applications can provide accurate alarm information. These information are displayed in the upper right corner of the monitor“！”The exclamation mark, when in measurement mode, displays the following fault content by flipping through the page with the down button:
Normal traffic
Excitation alarm
Air traffic control alarm
Supply completeness
Supply solution flow meters according to the order contract.
The random files include: one user manual, one product certificate, and one packing list.
Transportation and storage
To prevent damage to the instrument during operation, please maintain the packaging status as shipped from the manufacturer before arriving at the installation site. When storing, the storage location should be indoors with the following conditions:
ARainproof and moisture-proof;
BMechanical vibration is minimal and shock is avoided;
CTemperature range-20+60℃The humidity is not greater than80%.
run
Before putting the flowmeter into operation, the following checks should be carried out:
AIs there any damage to the flowmeter during transportation and installation;
BWhether the voltage of the power supply matches the voltage on the nameplate;
CThe instrument is wired correctly.
After inspection, open the pipeline valve to fill the pipeline with liquid, and pay attention to eliminating leaks and residual gases in the system. Then connect the instrument power supply, and generally preheat the flowmeter by powering it on10It will work normally in minutes. If there are any problems during operation, please contact our company.
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