Field devices

GFR - Gesellschaft für Regelungstechnik und Energieeinsparung mbH is one of the leading providers in the fields of building management and building automation, in particular with its registered trademarks DIGICONTROL® and DIGIVISION®.

We are happy to provide insight into innovations and solutions of our company. We have been offering expertise for meeting energy efficiency and environmental goals and enhanced comfort by utilising measuring and control technology/ building automation completely from one source for more than 40 years.

GFR – your partner for field devices in building automation
  • Full range of field devices
  • Sensors and monitors
  • Fittings and actuators
  • Damper actuators
  • Permanent availability of a well-assorted supply range from stock
  • The range of GFR field devices guarantees an optimum control quality
  • System-compatible connection
  • Reliable
  • Competent advice by an experienced team

Take advantage of our expertise!

For all questions, starting with the planning, implementation, optimization and support of your buildings, you have only one contact person with GFR.


What does “field device” mean?


“A field device is a piece of technical equipment in the field of measuring and control technology and an umbrella term for sensors and actuators in the field of automation technology.“

Your benefit: Energy-saving potential by improved temperature measurement

The reasons for temperatures that are not measured accurately in building technology are faulty positioning, the selection of unsuitable sensors or incorrect mounting. Control deviations and control circuit oscillations are short-term results. These measurement errors are occasionally ignored in practice and a compensation by adjusting the control parameters is often performed.

The user of the building does not feel any noticeable restrictions. The long-term effects of such apparently “comfortably”controlled plants are enormous as there is no primary focus on energy-optimised operation. The guideline VDI/VDE 3512 provides relief here as this standard does not only specify concrete requirements for the correct installation of temperature sensors for the building automation but also provides a quality rating which goes beyond tolerance classes. This allows enhanced energy balancing by means of a transparent comparability of sensor systems. This guideline represents an excellent decision criterion for planners, investors and plant builders with regard to the correct use of temperature sensors in building automation while considering all aspects of control technology and energy.

One thing is clear: If you already save money at the measuring point, you will experience considerable disadvantages as it relates to energy. For example, the drift of low-quality temperature sensors of grade B within the first three years is twice as high as of grade A sensors. The metrological effects of environmental influences and measurement errors caused by heat dissipation of the sensor itself (coupling factor) of grade B sensors are also twice as high as of grade A sensors. This applies to built-in sensors, bulb sensors, contact sensors and housing sensors.

There are only very low tolerance limits of 0.15K to 0.35K in case of applying PT temperature sensors of class A in the range from 0-100°C whereas a deviation of 0.80K is possible for class B PT1000 sensors and even 1.1K for Ni1000 sensors.

“6 per cent higher heating costs arise from every degree of a higher room temperature”.

If the building operator specifies a set point of 20°C for the room temperature, the “tolerantly“ measured temperature of “20°C” actually is 20.57°C and is therefore 0.57K above the set point. This is equal to 3.42% higher heating costs.

Finally, the real feel temperature of people has to be considered beside the real present temperature and the “tolerantly” measured temperature. Therefore, it is very important to start focusing on precision quality at the measuring point.

VDI/VDE guideline 3512 “Temperature measurement for building automation“

The present GFR temperature sensors DIGICONTROL represent a wide range of grade A-TGA devices, which meet all criteria (tolerance, drift, coupling factor) and provide best values in compliance with VDI 3512. The GFR room temperature sensors also contain a special tolerance class with only +/- 0.15K up to 30°C.

In addition to the wide range of the GFR product catalogue, there is also a selection of immersion and duct temperature sensors in “A class” version in accordance with VDI 3512 available.

Where are field devices used?

Field devices can be actuators (positioning elements, valve and damper drives, and frequency converters) and sensors (measuring transducers, probes, and monitors). The automation technology defines “field“as the area outside of control cabinets and control centres.


There are manifold application possibilities of field device technology:

Sensors and monitors

Outdoor temperature sensors
Outdoor humidity-temperature-sensor
Contact temperature sensor
Indoor temperature sensor
Mean value temperature sensor
Duct temperature sensor
Cable temperature sensor
Immersion temperature sensor
Immersion sleeves with clamp connection for cable temperature sensor
Pipeline temperature sensor
Outdoor brightness sensor
Indoor air quality sensor
Duct air quality sensor
Indoor CO2- and temperature sensor
Room motion detector / light sensor
Optical smoke detectors for room monitoring
Smoke switch system for air duct monitoring
Dew point/ condensation monitor
Anti-freeze thermostat
Pressure controller and pressure limiter
Differential pressure transmitter

Fittings and actuators

Straight way valves
Three-way valves
Thermoelectric valve drives
Electric linear actuators
Control and shut-off butterfly valves
Rotary drive for activating the control and shut-off butterfly valves
Control and shut-off butterfly valves with actuators

Damper actuators

Damper actuator for adjusting air dampers in ventilation and air-conditioning plants
Damper actuators with spring return

Take advantage of our expertise!

For all questions, starting with the planning, implementation, optimization and support of your buildings, you have only one contact person with GFR.


Tolerances and stability of sensors

The range of temperature sensors has been designed and developed in conjunction with and parallel to the revised version of the VDI guideline 3512. It is possible to determine temperature sensors ‘grades for building automation, which goes beyond the indication of tolerance classes (for the measuring resistors). This allows enhanced energy balancing of buildings and an optimum installation of sensors.

DIGICONTROL temperature sensors ensure increased energy efficiency and energy savings which is of great interest for building equipment suppliers, in particular within the framework of the EU programme “Green building“.

A good sensing element does not make a good sensor!

There are increasing stability and precision requirements on temperature sensors due to the strive for energy saving and energy efficiency in building automation. A market research shows an immense variety of available temperature sensor types but there is not a clear structure and classification of the sensors as it relates to stability and tolerance classes. These specifications are essential for energy savings and energy efficiency.

The high demands on energy efficient buildings and room automation are met by publishing the VDI/VDE 3512. This standard is the decision basis for the selection of state-of-the art temperature measuring technology for building service companies. The tolerance classes A/B/C TGA are differentiated according to the guideline VDI/VDE 3512 sheet 4. Quality-conform temperature sensors with appropriate test results may bear the labelling A TGA, B TGA or C TGA and the VDI/VDE identification, whereby the tolerance class A TGA is the most valuable one.

Contact us now

You will only have one contact partner as GFR is capable of answering all your questions concerning planning, implementation and support for your buildings.

Take advantage of our unique competence. We look forward to receiving your calls at 052 46 962-0

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