Profile: Platinum resistance thermometers are used for temperature measurements ranging from -200 to +850 °C. The sensor and protection tube are directly exposed to the measured temperature. The sensor type and protection tube design are crucial for sensor longevity and measurement stability.

Description: Industrial thermometer protective fittings consist of a protection tube and a termination head. The protection tube houses one or two sensors, while the termination head contains a connector block for lead connections, which can be replaced by a two-wire head transmitter. This transmitter converts the RTD signal into a standardized 4...20 mA signal. Thermometers can be mounted using adjustable flanges, compression fittings, welded bushes, or thermowells. A distance between the mounting fitting and head is necessary to reduce effects on the head and transmitter.

Principle of Operation: The resistance of electrical conductors to current flow is temperature-dependent. A constant current is passed through the sensor, and the voltage across it is measured. Resistance thermometers can be connected in 2-, 3-, or 4-wire configurations, with the 4-wire configuration providing the most accurate resistance determination.

Technical Data: The measuring sensor is a platinum resistance sensor (Pt100) with a tolerance of ± (0.3+0.005*[t])°C. Protection tubes are available in various forms and materials, with specific operating limits for temperature and pressure. Termination heads are weatherproof and available with standard or high doomed covers. Accessories include adjustable flanges and compression fittings.

Electrical Connection: Connections to measuring and control systems are made with copper leads. The ordering structure includes options for sensor configuration, protection tube type, and insertion length.