New Product Release | MS8115: High-Precision 4-20mA Current-Loop Transmitter

n industrial control and process monitoring, the 4-20mA current loop has become the standard for long-distance signal transmission. RuiMeng Technology introduces the MS8115 – a precision two-wire current-loop transmitter with a reference accuracy of just 0.05% and a nonlinearity error as low as 0.003%. It integrates a 5V regulator and a precision reference, delivering a high-accuracy signal transmission solution for industrial transmitters and similar applications.

Key Advantages

01 Reference Accuracy 0.05%, Nonlinearity Error 0.003%

The MS8115's internal reference achieves an accuracy of 0.05% and maintains high stability over the full industrial temperature range (-40°C to +85°C). With a nonlinearity error as low as 0.003%, the output current maintains a precise linear relationship with the input current (IOUT = 100 × IIN), ensuring accuracy and reliability in long-distance signal transmission.

02 Two-Wire 4-20mA Loop, Simplified System Design

The chip is specifically designed for two-wire 4-20mA current loops, supporting a wide output current range from 0.25mA to 45mA, covering the standard 4-20mA signal transmission requirements. The return current pin (RET) accurately detects any current flowing from external circuits, enabling closed-loop current regulation.

03 Integrated 5V Regulator and Precision Reference, Minimized External Circuitry

The chip integrates a 5V voltage regulator that can directly power external sensors, ADCs, and other circuits. It also includes a precision internal reference (2.5V for the MS8115), eliminating the need for an additional reference chip and greatly simplifying the peripheral circuit design.

04 Wide Supply Range and Ultra-Low Power Consumption

Supports a wide loop supply voltage from 8V to 40V, accommodating various industrial field power conditions. The chip itself consumes only 260μA of quiescent current, drawing almost no current from the loop budget, leaving more power available for sensors and loads.

05 Industrial-Grade Reliability

Operating temperature range from -40°C to +85°C. Output current line regulation is only 1μA and load regulation is only 0.7μA, ensuring stable output even under supply voltage fluctuations and load variations.

Technical Parameters (Typical Values)

Note: Refer to the datasheet for complete specifications.

Application Scenarios

1 Industrial Transmitters (Temperature / Pressure)

In temperature and pressure transmitters, sensor signals need to be converted to 4-20mA current for long-distance transmission. The MS8115's 0.003% nonlinearity error ensures highly linear signal conversion, while its low input noise of 0.6μVpp enables precise acquisition of weak sensor signals. The 2.5V precision reference can directly provide the excitation voltage for the sensor.

2 Two-Wire 4-20mA Current Loops

Designed specifically for two-wire loop applications, the MS8115's ultra‑low quiescent current of 260μA ensures that most of the loop current (minimum 4mA) remains available for external sensors. The output current remains stable against variations in total loop resistance, with no attenuation or added error over long distances. The wide supply range of 8V to 40V effectively handles cable voltage drops and supply fluctuations, guaranteeing stable operation across different power supply distances.

With 0.05% reference accuracy, 0.003% nonlinearity error, 260μA ultra‑low quiescent current, and an integrated 5V regulator, the MS8115 offers a high‑accuracy, highly integrated current‑loop solution for industrial transmitters, current amplifiers, and other applications.