Introduction:
K-type thermocouple bare wire is one of the thermocouple
temperature measurement devices commonly used in laboratories. It
is composed of chromium-nickel alloy wire and nickel-aluminum alloy
wire, and measures temperature changes through the thermoelectric
effect.
Type K thermocouple bare wire is suitable for a wide temperature
measurement range, typically from -200 degrees Celsius to 1,375
degrees Celsius. It has high accuracy and stability and is widely
used in temperature monitoring and control in laboratory
environments.
The structure of the K-type thermocouple bare wire is relatively
simple and consists of two alloy wires. One end of the two wires is
connected together to form a measurement point, and the other end
is connected to a temperature transmitter or data acquisition
system. The measuring point is exposed to the environment to be
measured, and temperature changes will cause a slight potential
difference between the alloy wires. By measuring this potential
difference, the temperature of the environment can be accurately
calculated.
The nominal chemical composition of the positive electrode (KP) is:
Ni:Cr≈90:10
The chemical composition of the negative electrode (KN) is:
Ni:Si≈97:3
Specific applications:
- Laboratory thermochemical reactions:
Type K thermocouple bare wire is commonly used in laboratories to
monitor and control the temperature of chemical reactions. Whether
in organic synthesis, catalytic reactions or other thermochemical
reactions, K-type thermocouple bare wire can provide accurate
temperature measurement, helping researchers understand the
temperature changes during the reaction and optimize and control
the reaction.
- Laboratory Thermodynamics Research:
In thermodynamic research, K-type thermocouple bare wire is used to
measure the temperature of the sample to obtain parameters such as
heat capacity, thermal conductivity, and thermochemical reactions.
By monitoring temperature changes, researchers can evaluate the
thermal properties of different substances and study thermodynamic
processes such as phase changes and thermal stability.
- Laboratory materials research:
In the field of materials science and engineering, K-type
thermocouple bare wire is used to measure the thermal conductivity,
thermal expansion coefficient and phase change temperature of
materials. This is crucial for the evaluation of thermal properties
of materials, the study of phase transition behavior, and the
control of temperature during heat treatment and processing of
materials.
- Laboratory environment monitoring:
K-type thermocouple bare wire can also be used for temperature
monitoring of laboratory environments. The temperature of the
laboratory environment is very important to the accuracy and
repeatability of certain experiments and tests. By placing K-type
thermocouple bare wires in key locations in the laboratory, such as
constant temperature baths, incubators, or temperature control
equipment, researchers can monitor temperature changes in real time
to ensure the reliability of experimental results.
Advantage:
Type K thermocouple bare wire offers many advantages in laboratory
applications. First, it has less impact on humidity and atmosphere,
and is suitable for relatively harsh environmental conditions.
Secondly, it has better linear response characteristics, making the
measurement results more accurate and reliable. In addition, K-type
thermocouple bare wire has a faster response speed and is suitable
for experimental processes that require fast response.
It should be noted that K-type thermocouple bare wire may be
affected by extreme high temperatures or oxidizing environments, so
in special applications in the laboratory, protective measures may
be required, such as the use of protective sleeves or coatings to
extend its service life.
In short, K-type thermocouple bare wire is widely used in
laboratories and can be used for temperature monitoring and control
of laboratory thermochemical reactions, thermodynamic research,
materials research, and temperature monitoring of laboratory
environments. Its accurate temperature measurement capabilities and
wide temperature range make it an indispensable tool during
laboratory research and experiments.
Relevant specific parameters:
Temperature range: -200°C to 1,372°C (-328°F to 2,502°F)
Thermoelectric potential output: approximately 39.4 μV (at standard
temperature difference)
Linear characteristics: has good linear characteristics
Sensitivity: approximately 41 μV/°C
Code | Wire Component of the thermocouple |
+Positive leg | - Negative Leg |
N | Ni-Cr-Si(NP) | Ni-Si-magnesium (NN) |
K | Ni-Cr(KP) | Ni-Al(Si) (KN) |
E | Ni-Cr(EP) | Cu-Ni (EN) |
J | Iron (JP) | Cu-Ni (JN) |
T | Copper (TP) | Cu-Ni (TN) |
B | Platinum Rhodium-30% | Platinum Rhodium -6% |
R | Platinum Rhodium-13% | Platinum |
S | Platinum Rhodium -10% | Platinum |
| ASTM | ANSI | IEC | DIN | BS | NF | JIS | GOST |
| (American Society for Testing and Materials) E 230 | (American National Standard Institute) MC 96.1 | (European Standard by the International Electrotechnical Commission
584)-1/2/3 | (Deutsche Industrie Normen) EN 60584 -1/2 | (British Standards) 4937.1041, EN 60584 - 1/2 | (Norme Française) EN 60584 -1/2 - NFC 42323 - NFC 42324 | (Japanese Industrial Standards) C 1602 - C 1610 | (Unification of the Russian Specifications) 3044 |
| Diameter/mm | Long time Working | Short period Working | | temperature/°C | temperature/°C | | 0.2, 0.3 | 150 | 200 | | 0.5, 0.8 | 200 | 250 | | 1.0, 1.2 | 250 | 300 | | 1.6, 2.0 | 300 | 350 |
|
Using Occastion of Different Thermocouple |
Thermocouple Type | Working Atmosphere | Working Temperature |
Type K | KP | Oxidizing | -200 to +1200℃ |
KN | Inert |
Type N | NP | Oxidizing | -200 to +1200℃ |
NN | Oxidizing |
Type E | EP | Oxidizing | -200 to +900℃ |
EN | Oxidizing |
Type J | JP | Oxidizing(use in high temp) | -40 to +750℃ |
JN | Reducing, Inert, Vacuum |
Type T | TP | Oxidizing,Vacuum | -200 to +350℃ |
TN | Reducing, Vacuum |
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