0102030405
Three-Phase Digital Combined Meter from China Suppliers and Factory for Industrial Power Monitoring
Product Overview
Its core application focuses on the accurate measurement and visualization of three-phase current, three-phase voltage, and grid frequency, with scalable parameter options to meet diverse user requirements for power system diagnostics and efficiency analysis.
⚡ Core Measurement Capabilities
The Instrument offers flexible, configurable measurement ranges to accommodate both three-phase three-wire (3P3W) and three-phase four-wire (3P4W) system topologies, with the following parameter coverage:
- Current Measurement: Accurate RMS current detection for all three phases — IA (Phase 1), IB (Phase 2), and IC (Phase 3).
- Voltage Measurement: Comprehensive RMS voltage monitoring including phase voltages (UA = L1-N, UB = L2-N, UC = L3-N) and line-to-line voltages (UAB = L1-L2, UBC = L2-L3, UCA = L3-L1) — totaling six independent voltage channels.
🔧 Extended Parameter Options
The Instrument is available in multiple variants with additional measurement functions to suit specific application needs:
Basic Variant
Grid frequency measurement (typically 45–65 Hz)
Mid-Range Variant
Frequency + power factor (capacitive/inductive range) measurement
Advanced Variant
Frequency + active power (W/kW/MW) measurement
This multi-parameter design enables the Instrument to replace a suite of standalone devices:
Three-Phase Ammeters
Three-Phase Voltmeters
Frequency Meters
Power Factor Meters
Active Power Meters
🏆 Key Technical Features & Advantages
1
Advanced Surface Mount Technology (SMT) Construction
The Instrument utilizes state-of-the-art 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 characterized by high vibration, temperature fluctuations, or electromagnetic interference (EMI). The compact form factor also supports flexible DIN-rail or panel-mount installation, saving valuable space in control cabinets.
2
True RMS Measurement with AC Sampling
Equipped with a high-precision AC sampling module and true RMS measurement algorithm, the Instrument ensures accurate parameter readings regardless of waveform distortion caused by non-linear loads (e.g., variable frequency drives, rectifiers, switching power supplies, or arc furnaces). Unlike average-value sensing meters, this technology eliminates measurement errors induced by distorted waveforms, making the Instrument ideal for modern power systems with complex load profiles.
3
Programmable Display Scaling & Wide CT Compatibility
The Instrument features a user-programmable display multiplier function, enabling seamless calibration to match the ratio of external current transformers (CTs) with primary current ratings ranging from 5 A to 10,000 A. This flexibility allows the local digital display to directly show the primary system current values, eliminating the need for manual ratio calculations and simplifying on-site data interpretation for field technicians. The Instrument is compatible with standard CT models rated for 1 A or 5 A secondary output, ensuring easy integration with existing power monitoring infrastructure.
Technical Parameters
Input & Communication Parameters
| 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 | 45–65 Hz | ||
| Output | Communication | Output mode | RS485 |
| Protocol | MODBUS_RTU | ||
| Baud rate | 1200, 2400, 4800, 9600 | ||
Output, Accuracy, Power & Environment Parameters
| Output | Analog Quantity | Channel quantity | 4 channels |
| Output mode | 0~20mA, 4~20mA | ||
| Load ability | ≤400W | ||
| Switching Value | Channel quantity | 4 channels | |
| Output mode | Normally open relay contact output | ||
| Contact capability | AC 240V / 0.1A | ||
| Switching value input | Four 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 | ± 0.01 PF | ||
| Source | Scope | AC 220V 50/60Hz or AC/DC 85~265V | |
| 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°C ~ 50°C | |
| Storage: -25°C ~ 70°C | |||
| Humidity | <85% RH, free of wet and corrosive gas | ||
| Elevation | ≤3000m | ||
Frequently Asked Questions (FAQ)
What network topologies does this instrument support?
The instrument supports both three-phase three-wire (3P3W) and three-phase four-wire (3P4W) system topologies, making it suitable for a wide range of industrial and commercial power distribution configurations.
What is the difference between the Basic, Mid-Range, and Advanced variants?
The Basic Variant measures grid frequency (45–65 Hz) in addition to current and voltage. The Mid-Range Variant adds power factor (capacitive/inductive) measurement. The Advanced Variant further includes active power measurement (W/kW/MW), making it the most comprehensive option for detailed energy analysis.
What current transformer (CT) ratios are compatible with this instrument?
The instrument is compatible with standard CTs rated for 1 A or 5 A secondary output, and supports primary current ratings from 5 A up to 10,000 A. The programmable display multiplier function allows the display to show actual primary current values directly, eliminating manual ratio calculations.
How does True RMS measurement benefit installations with non-linear loads?
True RMS measurement accurately captures the actual power content of distorted waveforms, which are common in systems using variable frequency drives, rectifiers, switching power supplies, or arc furnaces. Unlike average-value meters, the True RMS algorithm eliminates errors caused by waveform distortion, ensuring reliable and precise readings in complex load environments.
What communication interfaces and protocols does the instrument support?
The instrument supports RS485 serial communication using the MODBUS_RTU protocol, with selectable baud rates of 1200, 2400, 4800, and 9600 bps. This enables seamless integration with SCADA systems, PLCs, and building management systems (BMS).
What are the operating environment requirements for this instrument?
The instrument operates reliably within a temperature range of -10°C to 50°C, with storage temperatures from -25°C to 70°C. It requires humidity below 85% RH (non-condensing, free of corrosive gas) and is rated for installations at altitudes up to 3,000 meters. The power supply accepts AC 220V 50/60Hz or a wide-range AC/DC 85~265V input.