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China SFN-9K6-3UI Digital Combined Meter | Three-Phase Power Measurement Suppliers & Factory Solutions
Product Overview
Core Measurement Capabilities
The SFN-9K6-3UI Meter is configured to capture critical voltage and current parameters across three-phase systems, with flexible measurement range options to accommodate diverse application requirements:
- Current Measurement: Accurately tracks RMS current values for all three phases, denoted as IA (Phase 1 Current), IB (Phase 2 Current), and IC (Phase 3 Current).
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Voltage Measurement: Offers two selectable voltage monitoring modes to match three-phase three-wire (3P3W) or three-phase four-wire (3P4W) system topologies:
- Phase Voltage Mode: Measures RMS phase voltages UA (Phase 1 Voltage), UB (Phase 2 Voltage), and UC (Phase 3 Voltage).
- Dual Voltage Mode: Captures both RMS phase voltages (UA, UB, UC) and RMS line-to-line voltages (UAB = L1-L2, UBC = L2-L3, UCA = L3-L1), totaling six independent voltage measurement channels.
Key Technical Features & Advantages
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1. Advanced Manufacturing & Circuit Design
The Meter utilizes Surface Mount Technology (SMT) for component assembly, resulting in a highly compact, dense circuit layout. This design minimizes internal signal interference, enhances structural stability, and delivers superior operational reliability—even in harsh industrial environments with high vibration, temperature fluctuations, or electromagnetic interference (EMI). -
2. High-Precision AC Sampling & RMS Measurement
Equipped with a dedicated AC sampling module and true RMS (Root Mean Square) measurement algorithm, the Meter ensures accurate parameter readings regardless of waveform distortion caused by non-linear loads (e.g., variable frequency drives, rectifiers, or switching power supplies). This feature eliminates measurement errors common in average-value sensing meters, making it ideal for distorted power system environments. -
3. Programmable Display Scaling & Wide CT Compatibility
The Meter’s programmable display multiplier function allows users to calibrate the device to match the ratio of external current transformers (CTs) with primary current ratings ranging from 5 A to 10,000 A. This flexibility enables direct, scaled display of primary system currents on the Meter’s local screen, eliminating the need for manual ratio calculations and simplifying on-site data interpretation for field personnel.
Technical Parameters
| Technical Parameters | Index | ||
|---|---|---|---|
| Input | Net work | Three-phase three-wire, three-phase four-wire | |
| Voltage | Rated value | AC 0~500v | |
| Over load | Consistent 1.2 times iostaotaoeos, 2 times /30s | ||
| Consumption | <0.5VA (each phase) | ||
| Impedance | >500kΩ | ||
| Current | Rated value | AC 1A, 5A | |
| Over load | Consistent: 1.2 times mstaotaneocs, 2 times /1s | ||
| Impedance | <2mΩ | ||
| Frequency | 45-65Hz | ||
| 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/0.1A | ||
| Switching value input | 4 channel dry contact input modes | ||
| Display mode | LED (Red) | ||
| Measuring accuracy | Voltage, current | ±(0.5%FS + one digit) | |
| Active power, reactive power | ±(0.5%FS + one digit) | ||
| Frequency | ±0.1 Hz | ||
| Power factor | ±0.01PF | ||
| 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 | ||
Frequently Asked Questions (FAQ)
Q1: What parameters does the SFN-9K6-3UI Meter measure?
The SFN-9K6-3UI Meter captures critical voltage and current parameters across three-phase systems. This includes RMS current values for all three phases (IA, IB, IC) and RMS phase/line-to-line voltages (UA, UB, UC, UAB, UBC, UCA) depending on the configuration mode.
Q2: Can this meter be used with external current transformers (CTs)?
Yes. The meter features a programmable display multiplier function that is compatible with external Current Transformers (CTs) with primary current ratings ranging from 5 A to 10,000 A. This allows direct scaling and display of primary system currents on the local screen.
Q3: What communication protocols and interfaces does the meter support?
The meter supports RS485 communication utilizing the MODBUS_RTU protocol. It supports configurable baud rates of 1200, 2400, 4800, and 9600 bps.
Q4: How does the meter handle distorted power waveforms?
The meter is equipped with a dedicated AC sampling module and a true RMS (Root Mean Square) measurement algorithm. This design ensures highly accurate parameter readings even in environments with waveform distortion caused by non-linear loads like variable frequency drives or rectifiers.
Q5: What are the environmental operating limits for the SFN-9K6-3UI Meter?
The meter operates in temperatures ranging from -10°C to 50°C (storage from -25°C to 70°C), with relative humidity levels below 85% RH (free of wet and corrosive gas), and at elevations up to 3000 meters.