Electrical thermometers by WIKA
The WIKA programme for electrical thermometers includes thermocouples and resistance thermometers for all fields of industry. Measuring ranges of -200 ... +1,600 °C are covered with numerous instrument variants. Optionally, analogue or digital temperature transmitters can be fitted within the connection housing or connection head of the electrical thermometer. Built-in digital on-site displays complete the product portfolio. Within WIKA's wide range you will find the right electrical thermometer for each application:
What types of electrical thermometers are available from WIKA?
With electrical thermometers, the following designs are used predominantly within industrial temperature measurement:
- Resistance thermometers (RTD)
- Thermocouples (TC)
When are electrical thermometers with measuring resistors (resistance thermometers) used?
Electrical thermometers with temperature-dependent Pt100 or Pt1000 measuring resistors have their strengths in lower to medium temperature ranges (-200 … +600 °C). As the temperature rises, so too does the built-in resistance of the electrical thermometer. One therefore refers to it as a PTC (positive temperature coefficient). The characteristics of electrical thermometers with integrated Pt100 and Pt1000 are defined in EN 60751.
When are electrical thermometers on the basis of a thermocouple suitable?
Electrical thermometers on the basis of a thermocouple are primarily used for the measurement of high temperatures (up to 1,600 °C). The actual measuring point of these electronic thermometers consists of two wires of different materials, which form the measuring point in a connection point. When there is a change in temperature at the measuring point, a voltage can then be measured at the ends of the wires (cold junction). This is approximately proportional to the temperature of the measuring point (hot junction). The thermocouple does not measure the absolute temperature, but rather the difference between the cold and hot junction. The characteristics of electrical thermocouples which are based on the use of thermocouples are specified in accordance with EN 60584 and ASTM E230.
What are the response times of the various measuring inserts?
The measurement of the response time is carried out in flowing water in accordance with DIN EN 60751 and VDI / VDE 3522.
- Ø 6 mm 1xTyp K, ungrounded: t0.5 = 3.3 sec. t0.9 = 7.9 sec.
- Ø 6 mm 1xTyp K, grounded: t0.5 = 1.1 sec. t0.9 = 3.5 sec.
- Ø 6 mm 1xPt1 ...
Why is there some white foaming inside the case of liquid-filled pressure gauges?
With liquid-filled pressure gauges, white foam can occasionally form inside the case. This is the well-known phenomenon of an electrochemical reaction between aluminium components (e.g. pointers, dial) and the case filling (mainly with glycerine-wa ...
more
