High-temperature temperature sensor 210K

High-temperature temperature sensor 210K (thermocouple, thermoelectric converter, temperature sensor) is used in many industries to measure the temperature of air, exhaust gases and their combustion products, and other chemically non-aggressive media in the temperature range from -40 to 1000 °C.

The range of temperatures measured by the sensors depends directly on the chemical composition of the measuring element. The main measuring element of such sensors is a segment of thermoelectrode wire, sequentially connected from two different conductive metals, called a "thermocouple." According to its purpose and design, a thermocouple can be immersion or surface, hermetic or non-hermetic (with or without a sheath), shockproof, stationary, portable, etc.

Features:

• The measuring element is additionally protected by a ceramic cap which increases the durability of the sensor.
• The terminal block allows reliable fastening of the sensor.
• Short-term operation of the sensor is possible at 1200 °C.
• Since the protective beads and terminal block are made of ceramic, it is necessary to avoid impacts on the sensor during installation and operation.
• The high-temperature temperature sensor modification 210K is not intended for measuring the temperature of liquids, melts containing nitric acid and nitrates, and is also not recommended for use in atmospheres with increased sulfur and ammonia content.

Type characteristics:

• THA - K -40..1000 °C
• THK - L -40..600 °C
• THJ - J -40..600 °C

Type K (chromel-alumel thermocouple):

• Widely used in various industries from -100 °C to +1000 °C (recommended limit depends on the diameter of the thermoelectrode);
• In the range from 200 to 500 °C, a hysteresis effect occurs, i.e., readings during heating and cooling may differ. Sometimes the difference can reach 5 °C;
• Used in a neutral atmosphere or atmosphere with excess oxygen;
• After thermal aging, readings decrease;
• Not recommended for use in a rarefied atmosphere, since chromium may migrate from the Ni lead (so-called migration), causing the thermocouple to change the thermoelectric voltage and show a lowered temperature;
• Sulfur-containing atmosphere is harmful to the thermocouple because it affects both electrodes.

Type J (iron-constantan thermocouple):

• Not recommended for use below 0 °C, because moisture condensation on the iron lead causes rust formation;
• Most suitable for rarefied atmosphere;
• Maximum application temperature is 500 °C, as above this temperature rapid oxidation of leads occurs. Both leads quickly degrade in sulfur atmosphere;
• Readings increase after thermal aging;
• An advantage is the low cost.

Accuracy class:

• THA - 1, 2, 3
• THK - 2, 3
• THJ - 1, 2