Isolated 20mA splitter AC-20mA-2
The AC-20mA-2 is an industrial precision dual-channel analog current loop splitter designed to duplicate a single 0/4–20mA process transmitter signal into two independent, mutually isolated 0/4–20mA active current outputs. Built with a pure linear analog isolation amplifier without PWM conversion or digital reconstruction, it delivers continuous analog tracking with an ultra-fast response time (< 1 ms) and exceptionally low output ripple noise (< ±0.1%). With an ultra-high 4.25 kV RMS galvanic isolation barrier between input and outputs, it breaks troublesome ground loops between field sensors and multiple receiving devices (such as a local digital indicator and a central PLC/DCS analog input card), ensuring signal integrity and comprehensive equipment protection.
Key Features
- 4–20mA input to dual independent 4–20mA isolated outputs
- 4.25 kV RMS galvanic isolation between input and outputs
- 1.5 kV RMS isolation between channels and auxiliary power
- Ultra-fast response time (< 1 ms) for real-time loop splitting
- Drives loop loads up to 500 Ω per channel with ±0.2% full-scale accuracy
- Pure analog linear amplifier topology with zero digital sampling artifacts
- Front-panel multi-turn Zero and Span calibration potentiometers
- 24V DC auxiliary power supply (18V to 30V DC operating range)
- Compact 22 mm DIN rail and wall mountable enclosure
- Dimensions: 100 mm × 76 mm × 22 mm
Ordering Information
| Product Code | Description |
|---|---|
| AC-20mA-2 | Isolated 20mA Splitter (1 Input, 2 Outputs, 24V DC, 4.25kV Isolation) |
| AC-420-420 | Signal Isolator 4–20mA to 4–20mA Current Loop Isolator |
| AC-10V-10V | Isolated Analog Signal Converter 10V to 10V DC |
| SPD-20MA | 4–20mA Surge Protection Device |
| USS20M24V-D | Current Source Simulator 0/4 to 20mA with Digital Display |
| SPD-24V-DC | Surge Protection Device 24V DC SPD |
Applications
- Dual-Receiver Monitoring: Splitting a single 4–20mA field transmitter signal simultaneously to a central PLC/SCADA system and a local panel meter or chart recorder.
- Redundant Control Systems: Feeding primary and standby safety PLCs from a single critical field process sensor.
- Ground Loop Elimination: Resolving common-mode voltage differences between control rooms and field instrumentation.
- Process Automation & Interlocks: Providing parallel 4–20mA feedback to both variable speed drives and automation controllers.
- Control Panel Building: Compact 35 mm DIN rail mounting for clean and space-efficient cabinet wiring.
Specifications
| Parameter | Value |
|---|---|
| Mounting Type | 35 mm DIN Rail Mounting |
| Dimensions | 110 mm x 47 mm x 25 mm (L x H x W) |
| Weight | 100 g |
| Enclosure Material | Industrial Grade ABS |
| Operating Temperature | -20 °C to +55 °C |
| Storage Temperature | -40 °C to +85 °C |
| Relative Humidity | 5% to 95% RH (non-condensing) |
Electrical Specifications
| Parameter | Specification |
|---|---|
| Power Supply Voltage | 24V DC \(\pm 25\%\) (18V to 30V DC) |
| Operating Current | 100 mA @ 24V DC |
| Input Signal Range | 0/4–20 mA DC (Single Channel Input) |
| Input Impedance | \(\le 100\,\Omega\) |
| Output Signal Range | Dual 0/4–20 mA DC (Channel 1 & Channel 2, Load \(\le 500\,\Omega\) each) |
| Conversion Accuracy | \(\pm 0.1\%\) of Full Scale @ 25 °C (max \(\pm 0.2\%\)) |
| Output Ripple Noise | \(< \pm 0.1\%\) of Full Scale |
| Response Time | \(< 1\text{ ms}\) (< 1 milliSec) |
| Temperature Drift | \(< 100\text{ ppm} / \text{°C}\) |
| Status Indication | Power LED ON (PWR) |
| Field Calibration | Front-panel multi-turn Zero and Span trimpots |
Isolation & Protection Specifications
| Parameter | Value | Standard / Notes |
|---|---|---|
| Galvanic Isolation (Input to Outputs) | 4,250 V RMS (4.25 kV) | Optical & magnetic isolation barrier (1 min) |
| Galvanic Isolation (Between Output 1 & 2) | 1,500 V RMS (1.5 kV) | Complete channel-to-channel isolation |
| Galvanic Isolation (Input to Aux. Power) | 1,500 V RMS (1.5 kV) | Continuous dielectric isolation |
| Outputs to Aux. Supply | Shared Common Ground | Non-isolated reference ground |
| Reverse Polarity Protection | Integrated | Protects internal circuitry against reverse DC supply wiring |
| Transient Clamping | 600W TVS | Surge and spike suppression across all ports |
Functional Isolation Architecture & Dynamic Response
The pure linear analog architecture provides true continuous signal isolation without quantization stepping or switching ripples.
Oscilloscope Dynamic Waveform Verification
Oscilloscope measurement verifying that the isolated output signal reproduces the input waveform with sub-millisecond response latency (< 1 ms) and clean signal fidelity:
Mechanical Dimensions
Terminal Details & Wiring
Connection Pinouts
| Terminal Block | Pin | Label | Signal | Description |
|---|---|---|---|---|
| Input Terminals | 18 | IN + | Input (+) | Single 0/4–20mA Current Loop Input (+) |
| (Bottom Block) | A2 | IN - | Input (-) | Current Loop Ground Return (-) |
| – | NC | Unused | Reserved / Not Connected | |
| – | NC | Unused | Reserved / Not Connected | |
| Output Channel 1 | 15 | OP1 + | Output 1 (+) | Isolated 0/4–20mA Output Channel 1 (+) |
| (Top Block) | 26 | OP1 - | Output 1 (-) | Channel 1 Ground Return (-) |
| Output Channel 2 | 16 | OP2 + | Output 2 (+) | Isolated 0/4–20mA Output Channel 2 (+) |
| (Top Block) | 28 | OP2 - | Output 2 (-) | Channel 2 Ground Return (-) |
| Power Terminals | A1 | A1 V+ | +24V DC | Auxiliary Power Supply Input (+24V DC) |
| (Top Block) | 25 | 25 GND | Power 0V | Auxiliary Power Supply Ground Return |
Available Variants & Configurations
The Veawe Precision Analog Isolator family is available in standardized and custom input/output configurations:
| Signal Converter Input | Output | High Voltage Input | Output | Transducer Input | Output |
|---|---|---|---|---|---|
| 0–20 mA | 0–20mA, 4–20mA, 0–10V, ±10V | 30V DC | 0–20mA, 4–20mA, 0–10V | Pt100 | 0–20mA, 4–20mA, 0–10V |
| 4–20 mA | Dual 0/4–20 mA (Splitter) | 70V DC | 0–20mA, 4–20mA, 0–10V | Pt1000 | 0–20mA, 4–20mA, 0–10V |
| 0–10 V DC | 0–20mA, 4–20mA, 0–10V, ±10V | 100V DC | 0–20mA, 4–20mA, 0–10V | K type | 0–20mA, 4–20mA, 0–10V |
| 0–5 V DC | 0–20mA, 4–20mA, 0–10V, ±10V | 150V DC | 0–20mA, 4–20mA, 0–10V | J type | 0–20mA, 4–20mA, 0–10V |
| 75 mV DC | 0–20mA, 4–20mA, 0–10V, ±10V | 300V / ±300V DC | 0–20mA, 4–20mA, 0–10V | Resistance | 0–20mA, 4–20mA, 0–10V |
| ±75 mV DC | 0–20mA, 4–20mA, 0–10V, ±10V | 350V DC | 0–20mA, 4–20mA, 0–10V | — | — |
| — | — | 100V AC | 0–20mA, 4–20mA, 0–10V | — | — |
| — | — | 5A AC (CT) | 0–20mA, 4–20mA, 0–10V | — | — |
LED Indications and Diagnostics
| LED | Color | Status | Description |
|---|---|---|---|
| PWR | Green | ON | Auxiliary 24V DC operating power connected and regulated |
Revision History
| Revision | Date | Description of Change |
|---|---|---|
| Rev 1.0 | 2026-09-09 | Initial datasheet release |
Get the latest version of this datasheet : click here..
Support
Website: www.veawe.io
Email: info@veawe.io