1、 Product features, uses, and scope of application

1.1characteristic

●TKLDGThe series electromagnetic 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 are no flow blocking components inside 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;

● HavingRS485perhapsRS232ODigital communication signal output;

● It has conductivity measurement function, can distinguish whether the sensor is empty, and has self checking and self diagnostic functions;

● AdoptingSMDDevice and surface installation（SMT）High reliability of technology and circuits;

Can be used in corresponding explosion-proof situations.

1．2Main purpose

The TKLDG series electromagnetic flowmeter 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.

1．3Environmental conditions for use

Environmental temperature: sensor-25℃～+60℃ converter-10℃～+60℃

Relative temperature: 5%-95%

1．4working conditions

High 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

2．1mathematical-physical model

The working principle of electromagnetic 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.

As shown in Figure 1, 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.

2.2 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.Figure 2 shows the circuit structure of the converter.

3、 Product type and composition

3．1Product composition

The electromagnetic flowmeter 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.

3．2Product type

The TKLDG series electromagnetic flowmeter is 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

4．1Hospitality standards:JB/T9248-1999

4．2High flow rate:15m/s

4．3Nominal diameter:DN3、6、10、15、20、25、32、40、50、65、80、100、150、200、250、300、350

400450、500、600、700、800、900、1000、1200、1400、1600、1800、2000

4．4accuracy:0.5%、0.2%

4．5Nominal 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.

4．6Material Science:

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.

4．7Shell protection:

IP65：

IP68: Only sensors with separate chloroprene rubber and polyurethane lining, and does not include explosion-proof structures.

4．8Explosion proof standard:

DN15-DN600 integrated explosion-proof:md II BT4

DN15-DN1600 separated explosion-proof, sensors and converters installed in corresponding hazardous areasmd II BT4

DN15-DN1600 split explosion-proof, sensors installed in corresponding hazardous areas, converters installed in safe areas:md II BT4

4．9Connection cable: Separate electromagnetic flowmeter, signal cable is used to connect the sensor and converter, and the length of the cable should be less than100MMOur company provides free of charge with the watch10MCable, the insufficient part needs to be ordered.

4．10Converter 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 collector current is high250 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 collector current is highmA.

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 collector current is high250mAAlarm status: Fluid empty pipe, excitation disconnection, flow rate exceeding limit.

Damping time: in0-100SThe interval is optional.