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Product Introduction
| Instrument Class | Electromagnetic flowmeter | Type&Specification | JNLDE-DN15 | Medium | Water |
| Measurement Range | 10-100L/h | Nominal Pressure | 4.0MPa | Medium Temperature | Room temperature |
| Voltage | 24V | Output Signal | Pulse | Lining | F46 |
| Electrode | Titanium | Accuracy Grade | 1.0 | Coefficient | 3.4666 |
Product Functional Specifications
1.1 Basic Functions
Low-frequency square wave excitation, excitation frequencies: 1/16 of grid frequency, 1/20 of grid frequency, 1/25 of grid frequency.
High-frequency square wave excitation, excitation frequency: 1/2 of grid frequency (suitable for pulp measurement) (optional).
Excitation current can be selected as 125mA, 187.5mA, 250mA, 500mA.
Non-contact measurement function without additional electrodes, continuous measurement, setpoint alarm.
Flow velocity measurement range: 0.1 to 15 meters per second, flow velocity resolution: 0.5 millimeters per second.
AC high-frequency switching power supply, voltage range: 85VAC to 250VAC.
DC 24V switching power supply, voltage range: 20VDC to 36VDC.
Network functions: current loop communication function, MODBUS/GPRS/PROFIBUS (optional).
Chinese and English display modes (other languages can be customized).
Three calculators are internally available to separately record: forward total, reverse total, and difference total.
1.2 Special Functions
Power-off time recording function, automatically records the interruption time of the instrument system power supply, calculates the missing flow.
Hourly total recording function, records the total flow in hours, suitable for time-based metering.
Infrared handheld operation keyboard, enables remote non-contact operation of all functions of the converter.
1.3 Normal Operating Conditions
Ambient temperature: Split type -10 to +60°C.
Relative humidity: 5% to 90%.
Power supply: Single-phase AC 85 to 250V, 45 to 63Hz.
Power dissipation: Less than 20W (when connected with sensor).
1.4 Types of Sensor Connection
Integral Circular Housing: Circular housing directly connected to the sensor flange, explosion-proof design.
Integral Square Housing: Square housing directly connected to the sensor flange.
Split Square Housing: Wall-mounted square housing, converter connected to the sensor cable.
2. Converter Basic Circuit
The electromagnetic flowmeter converter provides a stable excitation current to the excitation coil of the electromagnetic flow sensor. The preamplifier amplifies and converts the induced electromotive force from the sensor into standard current or frequency signals, facilitating flow display, control, and regulation.
3. Technical Performance Specifications
3.1 Execution Standard
The design, production, and testing of the L-magB series electromagnetic flowmeter converter comply with the "JJG-1033-2007 Electromagnetic Flowmeter" standard.
3.2 Basic Parameters and Performance Indicators
3.2.1 Nominal Diameter of Matching Sensors (mm):
3.6, 10, 15, 20, 25, 32, 40, 50, 65, 80, 100, 125, 150, 200, 250, 300, 350, 400, 450, 500, 600, 700, 800, 900, 1000, 1200, 1400, 1600, 1800, 2000, 2200, 2400, 2500, 2600, 2800, 3000.
3.2.2 Matching Sensor Requirements:
Sensor signal sensitivity: At a flow rate of 1 meter per second, the sensor outputs 150μV to 200μV.
For the L-magB electromagnetic flowmeter converter, the excitation circuit uses four 62.5mA currents to form 250mA. Each 62.5mA current is controlled by a 20Ω precision resistor. Therefore, users can choose different excitation currents by changing the number of precision resistors.
The factory setting for the converter is 250mA current. Similarly, if using three precision resistors, it corresponds to 187.5mA; if using two precision resistors, it corresponds to 125mA.
Sensor excitation coil resistance:
500mA excitation current: 20-30Ω.
250mA excitation current: 50-60Ω.
187mA excitation current: 60-80Ω.
125mA excitation current: 100-120Ω.
3.2.3 Overall Measurement Accuracy
Set Range (m/s)
| Diametermm | Range m/s | Accuracy |
| 3~20 | 0.3 | ±0.25%FS |
| 0.3~1 | ±1.0%R | |
| 1~15 | ±0.5%R | |
| 25-600 | 0.1~0.3 | ±0.25%FS |
| 0.1~1 | ±0.5%R | |
| 1~15 | ±0.3%R | |
| 700-3000 | 0.3 | ±0.25%FS |
| 0.3~1 | ±1.0%R | |
| 1~15 | ±0.5%R | |
| %FS: Relative to Full Scale;%R: Relative Measurement | ||
3.2.4 Analog Current Output
Load Resistance: 420mA, 0750Ω.
Basic Error: 0.1% ± 10µA.
3.2.5 Digital Frequency Output
Frequency Output Range: 1~5000Hz;
Electrical Isolation of Output: Optoelectronic isolation. Isolation Voltage: >1000VDC;
Frequency Output Drive: Field-effect transistor output, maximum withstand voltage 36VDC, maximum load current 250mA.
3.2.6 Digital Pulse Output
Output Pulse Equivalents:
0.0011.000m³/cp,
0.0011.000Ltr/cp,
0.001~1.000T/cp.
Output Pulse Width: 50ms, automatically converted to square wave at high frequency;
Electrical Isolation of Output: Optoelectronic isolation, Isolation Voltage: >1000VDC;
Pulse Output Drive: Field-effect transistor output, maximum withstand voltage 36VDC, maximum load current 250mA.
3.2.7 Alarm Output
Alarm Output Contacts: ALMH---High limit alarm; ALML---Low limit alarm;
Electrical Isolation of Output: Optoelectronic isolation. Isolation Voltage: >1000VDC;
Alarm Output Drive: Darlington transistor output, maximum withstand voltage 36VDC, maximum load current 250mA.
3.2.8 Digital Communication Interface and Protocol
MODBUS Interface: RTU format, physical interface RS-485, electrical isolation 1000V;
Current Loop Communication Interface: Supports standard current loop communication protocol, configured with a current loop communication handheld device, can display measurement values online, and can modify instrument parameters;
3.2.9 Electrical Isolation
The insulation voltage between analog input and analog output is not less than 500V.
The insulation voltage between analog input and alarm power supply is not less than 500V.
The insulation voltage between analog input and AC power supply is not less than 500V.
The insulation voltage between analog output and AC power supply is not less than 500V.
The insulation voltage between analog output and ground is not less than 500V.
The insulation voltage between pulse output and AC power supply is not less than 500V.
The insulation voltage between pulse output and ground is not less than 500V.
The insulation voltage between alarm output and AC power supply is not less than 500V.
The insulation voltage between alarm output and ground is not less than 500V.
Product Details
Company Profile
Vision
With decades of rapid development and accumulation, China has been perfect and mature in technology and management in various industrial areas, shaping a complete processing manufacturing industry with competitive prices, well known for its excellent skill, high efficiency, and hardworking team with qualification for personnel dispatching.
At the time of economic globalization, it is our consistent target and objective to integrate and export all kinds of technology, management mode, engineering project, and manpower as per the actual requirement of our client with our abundant technical strength, superior integration capability of technology and resources, well experienced project implementation and management as basis and platform.
Let China go out to the world, and make the world know of China.
At the time of economic globalization, it is our consistent target and objective to integrate and export all kinds of technology, management mode, engineering project and manpower as per the actual requirement of our client With our own abundant technical strength, superior integration capability of technology and resources, well experienced of project implementation and management as basis and platform;
Let China go out to the world, and make the world know of China;
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