Working principle

The working principle of armored thermistor is that the resistance of the thermistor wire changes with temperature. The display instrument will indicate the temperature value corresponding to the resistance value generated by the thermistor.

Structure of Armored Thermal Resistors Product Structure

The structure of armored thermal resistance is the same as that of conventional thermal resistance, except that the temperature measuring element, insulation material, and protective sleeve in the five parts form the entire armor material.
Armor material (temperature measuring element, insulation material, protective sleeve): For thermal resistors, temperature measuring elements are temperature sensing elements and their internal leads; Use oxidation bonding as insulation material between the leads of each thermistor and between them and the protective sleeve; Protect insulation materials and temperature measuring components with metal tubes. The armor material process makes the temperature measuring element, insulation material, and protective sleeve a non removable, flexible, and compact entity. Armor material is the base material for manufacturing armor thermal resistors, and cannot be directly used for temperature measurement. Measurement terminals and simple wiring terminals must be made before it can be used as a base armor thermal resistor.
☆ Structure of Armored Thermistor Material

nominal pressure

Generally refers to the static external pressure that the protective tube can withstand without breaking at room temperature, and the test pressure is generally 1.5 times the nominal pressure. In fact, the allowable nominal pressure is only related to the material, diameter, and wall thickness of the protective tube, but also to its structural form, installation method, insertion depth, and the flow rate and type of the measured medium.

thermal response time

When there is a step change in temperature, the output of the thermal resistor changes to 50% of the step change, and the time required is called the thermal response time, which is represented by τ 0.5.

Thermal resistance insulation resistance

The test voltage for insulation resistance at room temperature can take any value from 10 to 100V DC, with an ambient temperature range of 15 to 35 ℃ and a relative humidity not exceeding 80%; The insulation resistance value at room temperature should not be less than 100M Ω.
When the length is less than 1 meter, the insulation resistance shall meet the standard requirement of 1 meter;
Due to the low insulation at high temperatures and significant signal interference caused by leakage, it is required to have input/output isolation measures on the transmission or display instrument.

Thermal resistance allows current to pass through

The maximum measured current through armored thermal resistance shall not exceed 5mA.

Minimum insertion depth

The minimum insertion depth of armored thermistor is smaller than that of assembled thermistor. The depth of embedding the armored thermistor sleeve into the medium should generally be greater than 75mm or 10 times the diameter of the sleeve, whichever is greater; The minimum insertion depth of the armored platinum thermistor using thin film components should not be less than 20mm.

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