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Power Factor Meter: High-Precision Digital Power Measurement Instruments from China Suppliers & Factory

Advanced Power Factor Meter & Digital Power Meter Solutions from China Suppliers

Discover our range of high-precision digital power measurement instruments, including advanced digital active power meters, reactive power meters, and power factor meters, meticulously designed for real-time monitoring of essential power parameters in three-phase AC electrical systems. As a prominent factory in China, we specialize in manufacturing these devices for industrial, commercial, and utility applications. Our instruments provide accurate and scalable measurements, essential for effective energy management, load analysis, and optimizing system efficiency. Trust our products to enhance your power management solutions.

Product Details

Product Overview

1.1 Measuring Range

1.1.1 Digital Active Power Meter

The meter supports a wide, scalable measurement range to accommodate low, medium, and high-power system loads, with seamless unit switching between watts (W), kilowatts (kW), and megawatts (MW):

Measurement Range: 0 ~ 9999 W ~ 9999 kW ~ 9999 MW

This broad range enables precise monitoring of:

Small-scale loads (e.g., control circuits, lighting systems)
Industrial machinery (e.g., motors, compressors)
Large-scale power generation/transmission systems (e.g., generators, substations)

1.1.2 Digital Reactive Power Meter

Designed to measure reactive power (the power stored and released by inductive/capacitive components in the system), the meter features a scalable range with unit switching between vars (Var), kilovars (kVar), and megavars (MVar):

Measurement Range: 0 ~ 9999 Var ~ 9999 kVar ~ 9999 MVar

Critical for applications such as:

Power factor correction
Load balancing
Grid stability monitoring — where reactive power management is essential to minimize energy waste and equipment stress

1.1.3 Digital Power Factor Meter

The meter provides high-resolution power factor measurement across the full spectrum of capacitive, unity, and inductive load conditions, with clear differentiation between capacitive (C) and inductive (L) power factors:

Measurement Range: 0.000 C ~ 0.500 C ~ 1.000 (unity) ~ 0.500 L ~ 0.000 L

Capacitive Range (0.000 C ~ 1.000): Applies to loads that supply reactive power to the grid (e.g., capacitor banks, over-excited synchronous motors).
Unity Point (1.000): Represents ideal load conditions where voltage and current are perfectly in phase, minimizing reactive power loss.
Inductive Range (1.000 ~ 0.000 L): Applies to loads that draw reactive power from the grid (e.g., induction motors, transformers, fluorescent lighting).

💡 The 0.001 resolution ensures precise monitoring of subtle power factor changes, supporting targeted power factor correction strategies.

1.2 Accuracy Rating

All meters are calibrated to strict accuracy standards, ensuring reliable, traceable measurements even under varying load and environmental conditions:

⚡ Digital Active Power Meter

±0.5% FS ± 1 digit

The ±0.5% FS tolerance ensures high accuracy across the entire measurement range, while the ±1 digit error accounts for minor digital display quantization effects.

🔄 Digital Reactive Power Meter

±1.0% FS ± 1 digit

Optimized for reactive power measurement, with a balance of accuracy and cost-effectiveness for standard industrial monitoring applications.

📊 Digital Power Factor Meter

±0.01

Delivers precise power factor readings with a maximum error of 0.01, critical for verifying compliance with utility power factor regulations and optimizing energy efficiency.

Technical Parameters

Function & Shape / Model	Measure & Display				Shape Code (Figure Inside)					Selected Additional Functions
Function & Shape / Model	1-phase power factor	1-phase active power	3-phase power factor	3-phase active factor	⑨ 96×96	⑧ 80×80	⑦ 72×72	⑤ 96×48	④ 48×48	Communication Interface: RS485
SFN-□K1-H	●				√	√	√	√	√
SFN-□K1-P		●			√	√	√	√	√
SFN-□K1-3H			●		√	√	√	√	√
SFN-□K1-3P				●	√	√		√
SFN-□K1-H+RS	●				√	√	√	√		＋
SFN-□K1-P+RS		●			√	√	√	九		＋
SFN-□K1-3H+RS			●		V	√	√	√		＋
SFN-□K1-3P+RS				●	√	√	A	√		＋

Frequently Asked Questions (FAQ)

Q What is the difference between the Digital Active Power Meter and the Digital Reactive Power Meter?

The Digital Active Power Meter measures real power (in W/kW/MW) — the actual energy consumed by a load to perform useful work. The Digital Reactive Power Meter measures reactive power (in Var/kVar/MVar) — the power stored and released by inductive or capacitive components without performing useful work. Both meters are essential for comprehensive power quality monitoring and energy management.

Q What does a power factor of 1.000 (unity) mean, and why is it important?

A power factor of 1.000 (unity) means that the voltage and current in the circuit are perfectly in phase, and all the power supplied is being used for productive work with no reactive power loss. This is the ideal operating condition. Maintaining a power factor close to unity reduces energy waste, lowers electricity costs, and minimizes stress on electrical equipment.

Q What panel cutout sizes are available for the SFN series meters?

The SFN series meters are available in five standard panel sizes: 96×96 mm (shape code ⑨), 80×80 mm (shape code ⑧), 72×72 mm (shape code ⑦), 96×48 mm (shape code ⑤), and 48×48 mm (shape code ④). Availability varies by model — please refer to the Technical Parameters table for the specific sizes supported by each model.

Q Which models support RS485 communication interface?

Models with the "+RS" suffix — including SFN-□K1-H+RS, SFN-□K1-P+RS, SFN-□K1-3H+RS, and SFN-□K1-3P+RS — are equipped with an RS485 communication interface. This allows integration with SCADA systems, building management systems (BMS), and industrial automation networks for remote monitoring and data logging.

Q What is the accuracy rating of the Digital Power Factor Meter, and how does it compare to the other meters?

The Digital Power Factor Meter has an accuracy of ±0.01, meaning the maximum error in any reading is 0.01 on the power factor scale. The Digital Active Power Meter offers ±0.5% Full Scale ±1 digit, while the Digital Reactive Power Meter offers ±1.0% Full Scale ±1 digit. The power factor meter's fixed ±0.01 accuracy is specifically designed to meet utility compliance requirements and support precise energy efficiency optimization.

Q Can these meters be used for both single-phase and three-phase power systems?

Yes. The SFN series includes models for both single-phase and three-phase systems. Models such as SFN-□K1-H and SFN-□K1-P are designed for single-phase power factor and active power measurement respectively, while SFN-□K1-3H and SFN-□K1-3P are designed for three-phase applications. Each model is available with or without the RS485 communication option to suit different installation requirements.