High-temperature temperature sensor ТХА-210, ТХК-210

High temperature temperature sensor ТХА-210, ТХК-210 (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 piece of thermocouple wire, sequentially welded from two dissimilar electrically conductive metals, which is called a "thermocouple". In accordance with the purpose and design, thermocouple may be submerged or superficial, sealed or leaky (with or without shell), shockproof, stationary, portable etc.

Features:

• Low thermal inertia.
• Short-term operation of the sensor is possible at 1100 ° C.
• Since the protective beads are made of ceramic, it is necessary to avoid impacts of the thermal converter during installation and operation.
• Not suitable for measuring the temperature of liquids, melts containing nitric acid and nitrates, and also for use in atmospheres with a high content of sulfur and ammonia.

NSX type:

• TXA - K -40..1000 ° C
• THK - L -40..600 ° C
• TJK - J -40..600 ° C

Type K (chromel-alumel thermocouple):

• Widely used in various fields from -100 ° C to + 1000 ° C (recommended limit, depending on the diameter of the thermocouple);
• A hysteresis effect occurs in the range from 200 to 500 ° C, i.e. the readings may differ during heating and cooling. Sometimes the difference reaches 5 ° C;
• Used in neutral or oxygen-rich atmospheres;
• After thermal aging, the readings decrease;
• It is not recommended to use in a discharged atmosphere, because chromium can be released from the Ni-terminal (the so-called migration), while the thermocouple changes the TEMF and shows an underestimated temperature;
• The sulfur atmosphere is harmful to the thermocouple as it affects both electrodes.

Type J (iron constantan thermocouple):

• It is not recommended to use it below 0 ° C, as moisture condensation on the iron lead leads to the formation of rust;
• The most suitable type for a rarefied atmosphere;
• The maximum application temperature is -500 ° C, since above this temperature, the leads are rapidly oxidized. Both leads are quickly destroyed in a sulfur atmosphere;
• The readings increase after thermal aging;
• The advantage is the low cost.

Tolerance class:

• TXA - 1,2,3
• THK - 2.3
• TLC - 1.2

Possibility of execution with terminal block THA-210k