Engineers and technicians rely on reliable 4-20 mA signal generators to simulate industrial sensors, diagnose control systems, and calibrate equipment. The following selections cover handheld portable units and larger programmable models, each capable of generating standard 4-20 mA current along with voltage outputs or additional signal types. This guide highlights five relevant options, their key capabilities, and how they fit common PLC and instrumentation workflows. Use the buying guide below to compare features such as output precision, battery life, display readability, and multi-signal support to choose the best tool for your needs.
| Product | Brand | Output Features | Power / Battery | Display |
|---|---|---|---|---|
| Riiai DC 0-10V 0/4-20mA Current Voltage Generator | Riiai Store | 0-22 mA, -10 to +10 V, 4-digit display | Built-in 1000 mAh battery + USB/DC 15-30V | 4-digit, multiple modes |
| Riiai SG003A 4-20mA 0-24V Generator | Riiai Store | 4-20 mA, 0-24 V, Hz pulse, multiple signal types | 3000 mAh USB rechargeable | 2.4″ TFT color screen |
| Champion Power Equipment 4000-Watt Inverter Generator | Champion Power Equipment Store | AC/DC multiple modes (inverter, 4000 W peak) | Gas/Propane powered, no built-in battery note | Basic display on unit |
| DROK 4-20mA Generator | DROK Store | 0/4-20 mA current, 0-10 V | Battery not specified; portable | Simple potentiometer control |
| Riiai 4-20mA Signal Generator | Riiai Store | Current/Voltage output, PWM, calibration | 1500 mAh rechargeable | Palm-sized, portable |
Riiai DC 0-10V 0/4-20mA Current Voltage Generator
This Riiai unit combines voltage and current generation in a compact package. It supports -10V to +10V output with a precision of 0.01V and 0-22 mA current with 0.01 mA precision. The encoder knob provides fine-grained control, and the device includes a 1000 mAh battery plus multiple power options (micro USB 5V or external DC 15-30V). A four-digit display offers flexible readouts of voltage or current, plus percent or frequency displays according to mode settings. Ideal for PLC panel debugging and on-the-go testing, it enables quick calibration and verification of analog inputs and loops.
Riiai SG003A 4-20mA 0-24V Generator
This model extends signal versatility with support for multiple signal types, including mA current (0-24 mA, 0.01 mA precision), voltage (0-24 V, 0.01 V), and Hz pulse signals (0-9999 Hz, 5-digit precision). The 2.4-inch TFT color display enhances readability in varied lighting, and a 3000 mAh USB rechargeable battery enables long field sessions up to about 26 hours. Suitable for PLC testing, calibration, and bench experiments, it delivers stable, switchable outputs and quick mode changes for real-time demonstrations.
Champion Power Equipment 4000-Watt Dual Fuel Generator
While primarily a portable inverter generator for power supply, this unit offers flexible fueling (gasoline or propane) and CO Shield auto shutoff for safety. It delivers up to 4000 starting watts and supports extended run times of up to 10 hours on gasoline and up to 25 hours on propane. It is best used for powering test rigs or field service tools where a reliable, quiet power source is required. The optional parallel kit adds capability to connect with other inverters or power stations for greater output and duration in demanding environments.
DROK 4-20mA Generator
The DROK unit combines current and voltage generation in a single module, allowing 0/4-20 mA current output and 0-10 V voltage output via a precise potentiometer. The compact design supports easy hand-held use and quick calibration tasks. This makes it well-suited for basic PLC testing, LED panel verification, and electronics debugging where a lightweight, single-device signal source is advantageous.
Riiai 4-20mA Signal Generator
This Riiai model emphasizes integration and portability. It supports current and voltage output, PWM square wave output, and calibration functions for electronic maintenance and testing. A compact 1500 mAh rechargeable battery enables cord-free operation, making it a practical on-site tool for technicians who need to verify analog loops and control signals without a bench power supply.
Buying Guide
Key considerations help buyers select the right 4-20 mA generator for PLC and instrumentation work. Topics include output range and accuracy, signal type versatility, power source and duration, display readability, and form factor. Below are perspectives to weigh:
- Output range and accuracy: Look for devices that cover 0-20 mA with tight tolerances (±0.01 mA is common) and voltage ranges that match your systems (e.g., 0-10 V or 0-24 V).
- Signal versatility: Some models offer multiple signal types beyond 4-20 mA, such as Hz pulses or PWM outputs, which can reduce tool count and simplify testing.
- Display and usability: A clear LCD or TFT display with mode switching helps during day and night testing. Four-digit readouts or color screens aid quick interpretation.
- Power options: Battery-powered units enable cordless operation in the field, while USB charging or external DC power increases flexibility in the shop.
- Portability vs. capability: Compact units excel for on-site use; larger units may provide advanced features like preset curves or multiple output modes suitable for lab calibration.
- Durability and safety: Consider enclosure robustness, PPE compatibility, and safety features such as auto shutoff or overload protection for sensitive PLC inputs.
- Maintenance and calibration: Devices with calibration features and straightforward configuration help maintain accuracy over time, particularly in industrial settings.
When comparing options, align features with your typical workflow. For panel debugging and bench tests, a unit with easy mode switching, high-precision output, and USB charging is advantageous. For remote field service, battery life, compact size, and a readable display become critical. If you require multiple signal types, prioritize products that can output both current and voltage, or that incorporate PWM and Hz capabilities. Always verify compatibility with your PLC or controller’s input range and response expectations to ensure reliable signal generation during testing.