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The core of a bimetallic thermometer is a spiral or helix-shaped bimetal element made of two metal strips with different thermal expansion coefficients welded together. When the temperature changes, the two metals expand differently, causing the element to twist and rotate the pointer via a shaft, indicating temperature directly on the dial. The entire process is purely mechanical, requiring no batteries or external power, and never fails due to a power outage. With no electronic components, it is immune to electromagnetic interference, making it suitable for use near variable-frequency motors and high-voltage switchgear. The response speed is moderate, sufficient for most industrial on-site temperature monitoring needs. Compared to glass thermometers, it is much stronger and less prone to breakage. Compared to thermocouples, it requires no transmitter and is more cost-effective.

The thermowell, connection, and housing of the bimetallic thermometer are typically made of 304 or 316L stainless steel, resistant to water, oil, weak acids, alkalis, and steam corrosion. Thermowell diameters range from 6mm, 8mm, 10mm to 12mm, with lengths customizable from 50mm to 2000mm. The housing protection rating reaches IP65 or IP66, dust-tight and protected against water jets or even brief immersion, suitable for outdoor or humid workshop installation. Connections between housing and thermowell include threads (G1/2, G3/4, NPT1/2, etc.) and flanges (DN25, DN50, etc.), with reliable sealing to prevent leakage. The housing can also be filled with silicone oil or glycerin to enhance vibration resistance, ideal for high-vibration equipment such as compressors, pumps, and engines. The fill fluid also prevents fogging inside the dial, keeping readings clear in alternating hot and cold environments.

The bimetallic thermometer offers a wide variety of temperature ranges, including common ones such as -40~+80C, 0~100C, 0~150C, 0~300C, 0~500ºC, with custom low-temperature extension to -80C. Accuracy classes are typically 1.0 or 1.5, meaning permissible error of ±1% or ±1.5% of span, meeting the requirements of most industrial on-site monitoring. Dial diameters include 60mm (compact), 100mm (general purpose), and 150mm (long-distance reading), with white background/black markings, and some models feature red alarm zones. The pointer can be designed with an external zero-adjustment screw for easy field calibration of zero error. For export equipment, dual-scale dials (C/F simultaneously) are available to suit different national habits. Additionally, electrical contacts can be added to output a switching signal when the temperature reaches a high or low limit for alarm or interlock control.

Brinell Hardness Tester

Brinell hardness testers are precision instruments designed to measure the hardness of metals by pressing a tungsten carbide ball into the material under a high load and evaluating the resulting indentation. This method is especially suitable for large, coarse-grained, or uneven materials such as castings and forgings where other hardness testing techniques may provide less reliable results.

About Captech
Captech is an ISO9001:2015 certified global leader and supplier of hardness tester. As a trusted Brinell Hardness Tester Supplier, we offer a wide range of high-precision Brinell hardness testers for laboratories, production lines, and on-site inspections. Our solutions combine reliability, accuracy, and customization to meet the demanding requirements of modern materials testing and industrial quality control.

Rockwell Hardness Tester Suppliers

A Rockwell hardness tester determines a materialâ??s hardness by measuring the depth of an indentation made by a diamond cone or steel ball under a specific load. This fast, accurate, and non-destructive method provides direct readings, commonly used for metals, with results reported on various scales (e.g., HRC, HRB) depending on the indenter type and load applied.

Captech is an ISO9001:2015 certified global manufacturer and supplier of advanced hardness testing equipment. We provide state-of-the-art Rockwell hardness testers, systems, and software for accurate, reliable, and efficient material testing in laboratories and industrial settings.

Vickers Hardness Tester

The Vickers Hardness Tester is a high-precision instrument designed for accurate hardness measurement across both micro and macro testing ranges. It is suitable for a wide variety of materials and delivers reliable, repeatable results, making it especially ideal for high-accuracy laboratory analysis and quality control applications.

Micro Vickers Hardness Tester Precision Microhardness Solutions by Captech
Micro Vickers hardness testers are essential for accurate hardness evaluation of thin materials, coatings, microstructures, and precision components. As an experienced Micro Vickers Hardness Testers Supplier, Captech offers a complete range of Micro Vickers hardness testing systems from fully automatic intelligent models to advanced digital testersâ??designed to meet laboratory research and industrial quality control demands.

Built with high-precision optical systems, automated force control, and intelligent software platforms, Captech Micro Vickers hardness testers ensure fast testing speed, excellent repeatability, and highly reliable measurement results even on complex or uneven surfaces.

Hardness Testers Supplier

Hardness Testers Supplier Captech Precision Hardness Testing Solutions
As a leading Hardness Testers Supplier, Captech delivers high-performance hardness testing instruments designed for accurate material evaluation, quality control, and industrial compliance. Our comprehensive product portfolio covers laboratory-grade systems, production-line testers, and portable inspection devicesâ??ensuring reliable results across diverse testing environments.

Backed by advanced manufacturing capabilities and strict quality standards, Captech hardness testers combine precision sensors, intelligent digital controls, and robust mechanical structures to provide consistent, repeatable, and internationally compliant testing performance.

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This automatic interfacial tension tester is designed to measure the surface tension (liquid-gas interface) of various liquids, as well as the interfacial tension between mineral oil and water (liquid-liquid interface). The instrument features a color touchscreen display and unmarked push buttons, with all menu prompts provided in Chinese. It is characterized by a high degree of automation, reliable operation, good repeatability, and extremely simple operation. After power-on, all tests can be completed simply by following the menu prompts.

Motion viscosity automatic tester for petroleum products, using high definition color touch screen technology, the interface is rich and clear, touch screen response is fast and flexible; Using large capacity memory chip, up to 2000 measurement results can be stored; The panel mounted thermal printer is used to automatically and quickly print the test results, sample number, test time, viscometer constant, pipe diameter, kinematic viscosity value and other information after the test.

The UHV-135kVA/108kV series resonance scheme adopts the method of adjusting the power supply frequency to achieve resonance between the reactor and the test capacitor, thereby obtaining high voltage and large current on the test object. Due to its small required power supply, light weight, and compact size, it has received widespread acclaim and application both domestically and internationally. It represents a new method and trend in high-voltage testing.

With the development of power system, the capacity of running equipment is increasing. For example, Thermal generator group, the single capacity has exceeded 1000MW, and hydrodynamo group, the maximum capacity has reached 800MW. If traditional test equipment (power frequency test transformer) is used for the ac power frequency withstand Voltage test of these devices, the regulator is very bulky because of the large test capacity required, and the high-capacity test power supply is difficult to solve in the field, so the field test is extremely inconvenient. The Power frequency withstand voltage tester host, no matter from test Power supply capacity, equipment weight, the waveform and has advantages in such aspects as investment. The Power frequency withstand voltage tester host focuses on the potential of capacity of 250 mw and below hydrodynamo ac withstand voltage test of the design and manufacture.

The UHV-316C motor comprehensive test bench is mainly applicable to the factory inspection of single-phase and three-phase small and medium-sized motors, test bench equipped with a test variable frequency power supply. Its main functions include DC resistance test, insulation resistance test, surge inter-turn test, electrical parameter test and power frequency withstand voltage test. The system can automatically determine whether the motor is qualified based on standard parameters.

The UHV-316D stator test system is mainly used for testing single-phase and three-phase generator stators, and can measure stators with 3-wire, 6-wire, 9-wire, and 12-wire windings. This test system adopts a 2-channel wiring method, suitable for testing 3-wire and 6-wire stators of new energy motors below H355 frame size.

Test items including DC resistance test, insulation resistance test, inter-turn insulation test, power frequency withstand voltage test, winding current balance test, and rotation direction test.

Optional test items including Inductance test, current balance test, magnetic field rotation direction test.

Our company's new generation of ultra-low frequency high voltage generator is the core product of independent research and development using the latest technology, using 7 inch touch screen, imported high-speed AD acquisition circuit, and advanced production technology. Improve the quality and stability of the instrument, reduce the volume and weight of the equipment, simple operation, overcome many shortcomings of similar domestic products, cost performance is much higher than similar imported products of mechanical booster short service life, high failure rate, large volume shortcomings. Compared with other voltage test equipment, 0.1Hz ultra-low frequency has many advantages.

Through years of practice, a large number of users' feedback shows that: this series of ultra low frequency and high voltage technology market leader, the highest cost performance!

The complete set of frequency conversion series resonance test equipment is mainly used for ac withstand voltage test of cross-linked cable, hydraulic generator, main transformer, bus, GIS, etc. It has a wide range of application and is an ideal withstand voltage equipment for local, municipal and count-level high voltage test departments and electric power installation, repair and test engineering units.

The complete set of frequency conversion series resonance test equipment is mainly composed of frequency conversion control power supply, excitation transformer, reactor, capacitor voltage divider and compensation capacitor (optional).