How Temperature Influences Metal Conductivity?

The conductivity tester is mainly used to detect the conductivity, resistivity, thermal conduction effect, heat dissipation effect, heat treatment condition, purity, etc., of non-magnetic colored metals such as copper and aluminum… It has an auto-compensation function. The conductivity measurement results are automatically corrected to a value at 20℃. The normal working environment temperature is 0℃ to +50℃, and relative humidity is 0 to 95%.

Conductivity has a great relationship with temperature. The conductivity of metals decreases as the temperature increases. The conductivity of semiconductors increases as the temperature increases, and within a certain temperature range, conductivity can be approximated as being proportional to the temperature.

How Temperature Influences Metal Conductivity?

In order to compare the conductivity of substances under different temperature conditions, a common reference temperature must be set.

The correlation between conductivity and temperature can often be expressed as: the slope of the conductivity versus temperature graph.

Appendix 1: Reference table of conductivity values and temperature coefficients for common materials.

MetalElectrical Conductivity(20℃)Temperature Coefficient (Parameter)(20℃)
Soft Copper≥100≥580.0038
Hard Copper≥97≥56.260.0038
Soft Aluminum≥61≥35.40.0040
Hard Aluminum≥59.5≥34.510.0040
Aluminum Bronze≥9≥5.20.0005
Average Value  0.0026

Appendix 2: Technical Specifications for the Sigma Conductivity Tester

Product Model ProjectSigma 2008Sigma 2008B, C
Operating Frequency60KHz Sine Wave60 KHz and 500KHz
Electrical Conductivity Measurement RangeFrom 0.8% IACS to 110% IACS, 0.46 MS/m to 64 MS/m or resistivity from 0.01560 to 0.02170 ohm·mm²/m.
Resolution0.01 %IACS (when less than 51% IACS); 0.1% IACS (within the range of 51% IACS to 110% IACS)
Measurement Accuracy±0.5% (when the temperature is at 20℃); ±1% (when the temperature is between 0℃ to 40℃)
Lifting EffectProbe compensation is 0.5mm
Temperature Measurement0℃ to +50℃ (with an accuracy of up to 0.5℃)
Automatic Compensation FunctionThe conductivity measurement result is automatically corrected to the 20℃ value
Normal Operating EnvironmentTemperature from 0℃ to +50℃, relative humidity from 0% to 95%
DisplayLarge LCD screen, with backlight, displays multiple important parameters simultaneously.
Power SupplyThree AA rechargeable batteries (Ni-MH) or three 1.5 volt AA alkaline rechargeable batteries can work continuously for more than 16 hours (without backlight).
ProbeType A machine is equipped with a probe of 14mm diameter and a working frequency of 60KHz.Type B and C machines are equipped with a probe of 14mm diameter with a working frequency of 60KHz and a probe of 8mm diameter with a working frequency of 500KHz.
Reading StorageCan save 500 measurement data files
PC Communication MethodRS 232 serial port
Mainframe Weight0.5KG (including battery)
Mainframe Size220mm×95mm×55mm
Instrument CasingHigh impact-resistant, waterproof engineering plastic shell
Packaging and ProtectionHigh impact-resistant, waterproof aluminum alloy portable case, equipped with instruments, probes, communication cables, operation manuals, conductivity standard blocks, chargers, and instrument stands
AttachmentsThree random conductivity standard test blocks are included, and more standard test blocks are available for purchase by the user.

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