Transmitter for current, voltage, temperature & pressure – 4–20 mA / 0–10 V

A signal transmitter (messumformer) converts a physical quantity (e.g. current, voltage, temperature, pressure, humidity, pH, conductivity) into a standardised output signal such as 4–20 mA or 0–10 V. This standard signal can then be processed safely and with low interference by PLCs, controllers or SCADA/building management systems.

Our range includes transmitters for current and voltage (AC/DC, True RMS), AC current transmitters, frequency and pulse transmitters, pressure transmitters, temperature transmitters for Pt100/Pt1000, pH and conductivity transmitters as well as oxygen and humidity transmitters – many of them with galvanic isolation and freely scalable measuring ranges.

Both provide standard analogue output signals. Transmitters with a 4–20 mA output are very immune to interference and cable resistance, which is why they are widely used in process industries. 0–10 V outputs are often used in building automation and applications with shorter cable runs. Many devices can be configured for either 4–20 mA or 0–10 V.

Current and voltage transmitters measure AC or DC signals from loads, power supplies or measuring transformers and convert them into a standard output signal. Typical applications are energy and load monitoring, machine condition monitoring, supervision of electrical circuits and interfacing analogue electrical values to PLCs or control systems.

Galvanic isolation electrically decouples input, output and supply circuits. This reduces interference, ground loops and the risk of dangerous voltages being transferred between circuits. Especially in systems with higher voltages, long cable runs or very sensitive input cards, transmitters with galvanic isolation are an important safety and quality feature.

Pressure transmitters are used for example in HVAC and ventilation systems, filter monitoring, clean room applications, water and process plants and pneumatic systems. They convert relative or differential pressure into a 4–20 mA or 0–10 V signal, enabling continuous monitoring and control of pressure in your process.

Start with the minimum and maximum process value you need to measure (e.g. temperature range, pressure range, current or voltage). The transmitter should cover this range safely without being oversized, to maintain good resolution. Then choose the output signal according to your system – typically 4–20 mA or 0–10 V. Many temperature and pressure transmitters offer configurable ranges and outputs via DIP switches or software.

Yes. Because transmitters provide standard signals such as 4–20 mA and 0–10 V, they can usually be connected very easily to existing PLC, DCS or building management systems. You only need to check that the input ranges, supply voltage and any required galvanic isolation match your existing hardware.

Yes, we offer various transmitters and signal isolators in Ex versions (for example temperature transmitters for Pt1000 or intrinsically safe signal isolators) that are approved for use in hazardous areas. Detailed information about approvals (e.g. ATEX, IECEx) is given in the data sheets of the respective products.

Of course. If you tell us the measured variable, measuring range, medium, required output signal (4–20 mA or 0–10 V), installation conditions and any special requirements such as Ex protection or galvanic isolation, we will recommend suitable transmitters from our range. You can contact us by phone or e-mail via the contact details given in the shop.