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Thermocouple model how to distinguish?
Release time:
2024-02-29
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Abstract
Commonly used thermocouples can be divided into two categories: standard thermocouples and non-standard thermocouples. The called standard thermocouple refers to the national standard stipulates the relationship between the thermoelectric potential and temperature, allowable error, and has a unified standard indexing table thermocouple, it has its supporting display instrument to choose from. Non-standardized thermocouples are not as good as standardized thermocouples in the range or magnitude of use, and generally there is no uniform indexing table, which is mainly used for measurement in some special occasions.
S, B, E, K, R, J, T seven kinds of standardized thermocouple for our unified design thermocouple.
The indexing numbers of thermocouples are mainly S, R, B, N, K, E, J, T, etc. Among them, S, R and B belong to precious metal thermocouples, and N, K, E, J and T belong to inexpensive metal thermocouples.
The following is an explanation of the thermocouple indexing number
S Platinum Rhodium 10 Pure Platinum
R Platinum Rhodium 13 Pure Platinum
Platinum rhodium 6 Platinum rhodium 30 B
K nickel chromium nickel silicon
T pure copper copper nickel
J iron copper nickel
N nickel chromium silicon nickel silicon
E Nickel Chromium Copper Nickel
Commonly used thermocouple indexing numbers are R, B, S, K, T, E, N.
1. First of all, visual inspection is divided into thickness: R, B, S, composed of precious metals, with thin wire diameter; K, T, E and N are common metals with thick wire diameter.
2, followed by heating to measure its output thermoelectric potential [approximate data]]:
For thick wire diameter, when heated at 100 ℃, the thermoelectric potential of K is 4.095mV; The thermoelectric potential of E is 6.317mV; The thermoelectric potential of N is 2.774mV; The thermoelectric potential of T is 4.277mV;
For thin wire diameter, the thermoelectric potential of B is 4.833mV when heated at 1000 ℃. The thermoelectric potential of R is 13.316mV, and the thermoelectric potential of S is 9.586mV.
[If the thickness of the wire diameter cannot be judged, directly heat and measure the thermoelectric potential, first heat 100 ℃, then heat 1000 ℃, because E and T types cannot withstand 1000 ℃]]
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