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Multifunctional LCD Power Instrument Factory in China – Reliable Suppliers for Electrical Monitoring Solutions
Product Overview
There are several different types of extended function modules to choose from: The four-channel analog quantity (0~20mA/4~20mA) output can transmit electrical quantity, while the four-channel switching value input and output can monitor and control local or long-range switch signals ("remote signaling" and "remote control"). The device may immediately replace a typical power transmitter, a measuring indication instrument, an electric energy measuring instrument, and any associated auxiliary units. With modular structural design, customers may select the most cost-effective functional configuration based on their specific requirements.
It is frequently utilized in applications such as energy management systems, supply and distribution network automation, district power control, and entire switchgear sets. It has the benefit of easy installation and maintenance. Sample wiring, small quantity, programmable input parameters, and networkable with various PLCs, industry control computer communications software.
It is frequently utilized in applications such as energy management systems, supply and distribution network automation, district power control, and entire switchgear sets. It has the benefit of easy installation and maintenance. Sample wiring, small quantity, programmable input parameters, and networkable with various PLCs, industry control computer communications software.
- ⚡ 4-Channel Analog Output: 0~20mA / 4~20mA for precise electrical quantity transmission
- 🔀 Switching Value I/O: Monitor and control local or remote switch signals
- 🔧 Modular Design: Flexible, cost-effective functional configuration per customer needs
- 🌐 Network Compatible: Works with PLCs and industrial control computer communications software
- 📦 Wide Application: Energy management, distribution automation, district power control, switchgear sets
Technical Parameters
Input & Output Specifications
| Technical Parameters | Index | ||
| Input | Network | Three-phase three-wire, three-phase four-wire | |
| Voltage | Rated value | AC 0~500V | |
| Over load | Consistent 1.2 times instantaneous, 2 times /30s | ||
| Consumption | <0.5VA (each phase) | ||
| Impedance | >500kΩ | ||
| Current | Rated value | AC 1A, 5A | |
| Over load | Consistent: 1.2 times instantaneous, 2 times /1s | ||
| Impedance | <2mΩ | ||
| Frequency | 45–65Hz | ||
| Output | Electric Energy | Output mode | Two-channel open-collector, optical coupling pulse output |
| Pulse constant | Active: 3200 imp/kWh Reactive: 3200 imp/kvarh |
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| Start | On the condition of rated voltage, reference frequency and cos=1.0, when load operational current is 0.01In, it can start and measure the electric energy continuously. | ||
| Creep | When exceeding 115% rated voltage and no current in the current circuitry, the instrument has no electric energy accumulation and pulse output. | ||
Communication, Analog & Switching Output
| Technical Parameters | Index | ||
| Output | Communication | Output mode | RS485 |
| Protocol | MODBUS_RTU | ||
| Baud rate | 1200, 2400, 4800, 9600 | ||
| Analog Quantity | Channel quantity | 4 channels | |
| Output mode | 0–20mA, 4–20mA | ||
| Load ability | <400Ω | ||
| Switching Value | Channel quantity | 4 channels | |
| Output mode | Normally open relay contact output | ||
| Contact capability | AC 240V / 2A | ||
| Switching value input | Four channel dry contact input modes | ||
| Display mode | LCD (Blue back lighting) | ||
| Measuring Accuracy | Voltage, Current | ± (0.5%FS + one digit) | |
| Active power, Reactive power | ± (0.5%FS + one digit) | ||
| Frequency | ± 0.1Hz | ||
| Power factor | ± 0.01PF | ||
| Active energy | ± 0.5% (only for reference, not for meterage) | ||
| Reactive energy | ± 1.0% (only for reference, not for meterage) | ||
| Source | Scope | AC 220V, 50/60Hz | |
| Consumption | <5VA | ||
| Safety | Withstand Voltage | Input and source | >2kV 50Hz / 1min |
| Input and output | >1kV 50Hz / 1min | ||
| Output and source | >2kV 50Hz / 1min | ||
| Insulating resistance | Any two of input, output, source, casing >20MΩ | ||
| Environment | Temperature | Operation: -10 ~ 50°C | |
| Storage: -25 ~ 70°C | |||
| Humidity | ≤85%RH, free of wet and corrosive gas | ||
| Elevation | ≤3000m | ||
Function & Model Selection Table
| Function & Shape / Model | Measure & Display | Shape Code | Selected Additional Functions | ||||||||||||||||||||
| Phase Voltage V | Line Voltage | Current | Frequency | Power Factor | Active Power | Total Reactive Power | Total Apparent Power | Each Phase Power Factor | Each Phase | Apparent Power | Active Energy | Reactive Energy | ⑨ 96×96 | ⑧ 80×80 | ⑦ 72×72 | Communication RS485 | 4-ch Switch Outputs | 4-ch Switch Input | 4-ch Analog Output | Harmonic | |||
| SFS-□S3-3E | ● | ● | ● | ● | ● | ● | ● | ● | ● | √ | + | ||||||||||||
| SFS-□SY-3E | ● | ● | ● | ● | ● | ● | ● | ● | ● | ● | ● | ● | √ | + | |||||||||
| SFN-□S3-3E | ● | ● | ● | ● | ● | ● | ● | √ | √ | + | |||||||||||||
| SFN-□SY-3E | ● | ● | ● | ● | ● | ● | ● | ● | ● | ● | ● | ● | ● | ● | √ | √ | √ | + | |||||
| SFN-□S3-3E+4DO | ● | ● | ● | ● | ● | ● | ● | ● | ● | √ | + | + | |||||||||||
| SFN-□SY-3E+4DO | ● | ● | ● | ● | ● | ● | ● | ● | ● | ● | ● | ● | ● | ● | √ | + | + | ||||||
| SFN-□S3-3E+4DI | ● | ● | ● | ● | ● | ● | ● | ● | ● | √ | + | + | |||||||||||
| SFN-□SY-3E+4DI | ● | ● | ● | ● | ● | ● | ● | ● | ● | ● | ● | ● | ● | ● | √ | + | + | ||||||
| SFN-□S3-3E+4AO | ● | ● | ● | ● | ● | ● | ● | ● | ● | √ | + | + | |||||||||||
| SFN-□SY-3E+4AO | ● | ● | ● | ● | ● | ● | ● | ● | ● | ● | ● | ● | √ | + | + | ||||||||
| SFN-□SY-3E+H | ● | ● | ● | ● | ● | ● | ● | ● | ● | ● | ● | ● | ● | √ | + | + | |||||||
Frequently Asked Questions (FAQ)
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What types of extended function modules are available for this device?
The device supports several extended function modules including: a four-channel analog quantity output (0~20mA / 4~20mA), a four-channel switching value output (relay contact), and a four-channel switching value input (dry contact). These can be selected based on specific application requirements, allowing for flexible and cost-effective configurations.
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What communication protocols does the device support?
The device supports RS485 communication interface with MODBUS_RTU protocol. It is compatible with multiple baud rates including 1200, 2400, 4800, and 9600 bps, enabling easy integration with PLCs and industrial control computer communications software.
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What is the measuring accuracy of this power meter?
The device provides high accuracy across all key measurements: voltage and current accuracy is ±(0.5%FS + one digit); active and reactive power accuracy is ±(0.5%FS + one digit); frequency accuracy is ±0.1Hz; power factor accuracy is ±0.01PF. Active and reactive energy are provided for reference only and not intended for billing meterage.
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What are the typical application areas for this device?
This device is widely used in energy management systems, supply and distribution network automation, district power control, and complete switchgear sets. It can directly replace conventional power transmitters, measuring indication instruments, electric energy measuring instruments, and associated auxiliary units.
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What are the power supply and environmental requirements?
The device requires an AC 220V, 50/60Hz power supply with a consumption of less than 5VA. It operates within a temperature range of -10°C to 50°C, with storage from -25°C to 70°C. Humidity should not exceed 85%RH, and the installation elevation should be no more than 3000m. The environment should be free of wet and corrosive gases.
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What panel sizes are supported and how do I select the right model?
The device is available in three panel sizes: 96×96mm (Shape Code ⑨), 80×80mm (Shape Code ⑧), and 72×72mm (Shape Code ⑦). The model number indicates the included measurement functions and any additional modules such as RS485 communication (+RS), 4-channel switching output (+4DO), 4-channel switching input (+4DI), 4-channel analog output (+4AO), or harmonic measurement (+H). Refer to the model selection table above to choose the configuration that best fits your requirements.