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℃ […]
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.
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.
| Metal | Electrical Conductivity（20℃） | Temperature Coefficient (Parameter)（20℃） | |
| %IACS | MS/m | ||
| Soft Copper | ≥100 | ≥58 | 0.0038 |
| Hard Copper | ≥97 | ≥56.26 | 0.0038 |
| Soft Aluminum | ≥61 | ≥35.4 | 0.0040 |
| Hard Aluminum | ≥59.5 | ≥34.51 | 0.0040 |
| Gold | ≥70.7 | ≥41 | 0.0034 |
| Silver | ≥108 | ≥62.5 | 0.0038 |
| Brass | ≥25 | ≥14.5 | 0.0020 |
| Aluminum Bronze | ≥9 | ≥5.2 | 0.0005 |
| Titanium | ≥3.6 | ≥2.08 | |
| Lead | ≥7.8 | ≥4.5 | 0.0039 |
| Tungsten | ≥15 | ≥8.7 | 0.0042 |
| Zinc | ≥30 | ≥17.4 | 0.0037 |
| Nickel | ≥22 | ≥12.8 | 0.0060 |
| Magnesium | ≥38 | ≥22 | 0.0040 |
| Average Value | 0.0026 | ||
Appendix 2: Technical Specifications for the Sigma Conductivity Tester
| Product Model Project | Sigma 2008 | Sigma 2008B, C |
| Operating Frequency | 60KHz Sine Wave | 60 KHz and 500KHz |
| Electrical Conductivity Measurement Range | From 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. | |
| Resolution | 0.01 %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 Effect | Probe compensation is 0.5mm | |
| Temperature Measurement | 0℃ to +50℃ (with an accuracy of up to 0.5℃) | |
| Automatic Compensation Function | The conductivity measurement result is automatically corrected to the 20℃ value | |
| Normal Operating Environment | Temperature from 0℃ to +50℃, relative humidity from 0% to 95% | |
| Display | Large LCD screen, with backlight, displays multiple important parameters simultaneously. | |
| Power Supply | Three AA rechargeable batteries (Ni-MH) or three 1.5 volt AA alkaline rechargeable batteries can work continuously for more than 16 hours (without backlight). | |
| Probe | Type 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 Storage | Can save 500 measurement data files | |
| PC Communication Method | RS 232 serial port | |
| Mainframe Weight | 0.5KG (including battery) | |
| Mainframe Size | 220mm×95mm×55mm | |
| Instrument Casing | High impact-resistant, waterproof engineering plastic shell | |
| Packaging and Protection | High impact-resistant, waterproof aluminum alloy portable case, equipped with instruments, probes, communication cables, operation manuals, conductivity standard blocks, chargers, and instrument stands | |
| Attachments | Three random conductivity standard test blocks are included, and more standard test blocks are available for purchase by the user. | |
As the founder of MachineMFG, I have dedicated over a decade of my career to the metalworking industry. My extensive experience has allowed me to become an expert in the fields of sheet metal fabrication, machining, mechanical engineering, and machine tools for metals. I am constantly thinking, reading, and writing about these subjects, constantly striving to stay at the forefront of my field. Let my knowledge and expertise be an asset to your business.
EN 
AR 
DE 
ES 
FR 
IT 
JA 
NL 
PT 
PT_BR 
RU 
KO