Difference between armored thermoresistors and assembled thermoresistors
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Please explain in detail the differences between armored thermoresistors and assembled thermoresistors
A general armored thermistor refers to a thermistor core that is armored (the core types include armored thermistor cores and mica thermistor cores); an assembled thermistor is a thermistor equipped with an outer protective sleeve (the core of an assembled thermistor can be an armored thermistor core or a mica thermistor core, etc.). I’m the manufacturer, haha. . .
The simple difference is that the thermoresistive element of an armored thermoresistor cannot be removed from the protective tube; it is enclosed together with the protective cover, whereas the element of a detachable thermoresistor can be taken out and replaced.
For measurement points with favorable temperature measurement conditions (where the pressure is low and the medium has low corrosivity), armored thermoresistors are used; thermoresistors equipped in this way can be used to measure the temperature of media under high pressure or with high corrosivity
Both utilize the property that a material’s resistance changes as its temperature changes to measure temperature. Armored thermoresistors have a smaller diameter than assembled ones, are easy to bend, and possess good seismic resistance; they are suitable for use in locations where assembled thermoresistors cannot be installed. Armored thermoresistors possess strong resistance to contamination and mechanical strength, making them suitable for installation in harsh environments.
Are the statements on the 4th and 5th floors contradictory? Who is really suitable for use in harsh environments?
Floors 4 and 5 may have different understandings of the environment; Floor 4 seems to be related to instrument manufacturing plants, and the environment it refers to is likely the process medium. What he mentioned is probably the situation where the armored thermoresistor is in direct contact with the process medium. What is mentioned on the 5th floor seems to refer to the production environment. Since the temperature-sensing element of an armored thermoresistor is covered by a metal sheath and insulating material, it is less susceptible to corrosion by harmful substances present in the production environment; therefore, armored thermoresistors are suitable for use in such harsh conditions. If the process media are highly corrosive, an additional protective sleeve should be installed around the armored thermoresistor.
Whether it is a sheathed thermistor or a modular thermistor, the temperature measurement is the same in both cases. If a sheath is used as the temperature-sensing element, the accuracy is higher, as the sheath is completely vacuum-sealed and not affected by any external interference. Generally, an output of 4-20 is ideal, and using an armored element as the temperature sensing element is the best choice! So there’s no need for so much nonsense; you’ll have to try it to find out!
Armored thermistor: The thermistor of the temperature sensing element and some of the connection wires are enclosed in a metal armor, with insulating material used to secure the thermistor and its connections to the armor； The so-called assembled thermoresistor refers to the installation of the thermoresistor and its wires within a protective sleeve.