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High-Precision Power Factor Meters from China Suppliers & Factory for Real-Time Energy Monitoring
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), and 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, and 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:
1 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.
2 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.
3 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 | |||||||
|---|---|---|---|---|---|---|---|---|---|---|
| 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 |
||
| SFN-□K1-H | ● | √ | √ | √ | √ | √ | ||||
| SFN-□K1-P | ● | √ | √ | √ | √ | √ | ||||
| SFN-□K1-3H | ● | √ | √ | √ | √ | √ | ||||
| SFN-□K1-3P | ● | √ | √ | √ | ||||||
| SFN-□K1-H+RS | ● | √ | √ | √ | √ | RS485 | ||||
| SFN-□K1-P+RS | ● | √ | √ | √ | √ | RS485 | ||||
| SFN-□K1-3H+RS | ● | √ | √ | √ | √ | RS485 | ||||
| SFN-□K1-3P+RS | ● | √ | √ | √ | RS485 | |||||
Frequently Asked Questions (FAQ)
Q
What is the measurement range of the Digital Active Power Meter?
The Digital Active Power Meter supports a scalable measurement range from 0 to 9999 W, 9999 kW, and up to 9999 MW, with seamless automatic unit switching. This makes it suitable for small-scale control circuits, industrial machinery, and large-scale power generation or transmission systems.
Q
What is the accuracy rating for each meter type?
The Digital Active Power Meter has an accuracy of ±0.5% Full Scale (FS) ± 1 digit. The Digital Reactive Power Meter is rated at ±1.0% FS ± 1 digit. The Digital Power Factor Meter provides a maximum error of ±0.01, ensuring high-precision readings for energy compliance and optimization.
Q
What does the Power Factor Meter's "unity point" (1.000) indicate?
The unity point of 1.000 represents ideal load conditions where the voltage and current are perfectly in phase with each other. At this point, there is no reactive power loss, meaning the electrical system is operating at maximum efficiency. It is the target operating condition for most industrial and commercial power systems.
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 enables integration with SCADA systems, building management systems (BMS), and other industrial communication networks for remote monitoring and data logging.
Q
What panel cutout sizes are available for the SFN series meters?
The SFN series meters are available in five enclosure sizes to suit different panel installations: 96×96 mm (⑨), 80×80 mm (⑧), 72×72 mm (⑦), 96×48 mm (⑤), and 48×48 mm (④). Availability varies by model — for example, the 3-phase models (SFN-□K1-3P) do not support the 72×72 mm and 48×48 mm sizes.
Q
Why is reactive power monitoring important in industrial applications?
Reactive power monitoring is essential for maintaining grid stability, improving power factor, and reducing energy waste. Excessive reactive power increases current flow without contributing to useful work, leading to higher energy costs, overheating of equipment, and potential utility penalties. The Digital Reactive Power Meter helps engineers identify and correct reactive power imbalances through power factor correction capacitors or other compensating devices.