China China Suppliers Bimetallic Thermometer - Back Connection Mounted Stainless Steel Factory Instrument for Industrial Temperature Measurement Supplier, Factory

The bimetallic thermometer, also known as the bi-metal thermometer, is an essential instrument for temperature measurement across various industrial applications. Renowned for its affordability and low maintenance requirements, this device offers straightforward installation, use, and calibration. Manufactured by reliable suppliers in China, this bimetallic thermometer utilizes two cold-welded metal strips with distinct thermal expansion coefficients, enabling quick reactions to temperature changes, Designed for precision, this back mounting process instrument is ideal for numerous industrial environments. Its durability and efficiency ensure stable and reliable temperature monitoring for users. Bimetallic thermometers operate on the principle that solids expand or contract with temperature fluctuations. Featuring two metal strips—typically steel paired with either copper or brass—these thermometers respond differently to the same temperature, each expanding or contracting at varied rates, The bonded strips are shaped into a helical or spiral coil, which is incorporated into the thermometer's stem. One end of the bimetallic coil is affixed to the stem, while the other end rotates to move the pointer. As temperatures rise, the strip bends towards the metal with the lower thermal expansion coefficient, resulting in rotational movement in one direction. Conversely, a decrease in temperature causes the strip to bend towards the metal with the higher coefficient, generating movement in the opposite direction. Trust in our factory in China for superior quality bimetallic thermometers that meet your industrial temperature monitoring needs

Product Description

Product Specifications
CaseStainless steel
Size50mm (2"), 60mm (2.5"), 75mm (3"), 100mm (4"), 125mm (5"), 150mm (6")
Ring (Cover)Stainless steel, in crimping type or bayonet type
WindowToughened glass / Polycarbonate
PointerAluminum Alloy, Black Finished, Zero-adjustable
DialAluminum alloy in white background, can be in customize brand logo
ConnectionSS304 (or SS316 as per request). Back connection mounting
Thread1/4", 3/8", 1/2"; PT(BSPT, ZG), BSP(G, PF), NPT etc as per request
Sensing ElementBi-metallic coil
AccuracyClass 1.6 as per EN 13190 (as standard), maximum 1.0
Over Pressure Limit110% of full scale value
Ambient Temperature−25°C to +65°C
Process TemperatureMax. 400°C
Stem MaterialStainless steel 304 (SS316 as per request)
Stem BulbDiameter 6mm or 8mm; length from 50mm to 500mm
ProtectionIP65
PackageNeural shake-proof package
Key Features
Compliance to EN 13190 standard
Customized & OEM dial design
Low price and low maintenance
Easy onsite calibration (zero-point resetting)
Near-linear response to temperature changes
Suitable for a wide temperature range, from −94°F to 1,112°F (−70°C to +600°C)
Robust design, suitable for high-vibration applications
No need for wiring or power source, for easy installation, operation, and maintenance
Applications
Some industries where bimetallic temperature gauges are used are:
  • Heating, ventilation, and air handling, including hot water tanks and solar thermal systems
  • Industrial refrigeration
  • Machine building
  • Testing and laboratories
  • Water and wastewater treatment
Frequently Asked Questions (FAQ)
Q What is a bimetallic temperature gauge and how does it work?
A bimetallic temperature gauge measures temperature using a bi-metallic coil as its sensing element. The coil is made of two metals bonded together with different thermal expansion rates. When temperature changes, the coil bends or twists proportionally, moving the pointer on the dial to indicate the current temperature — no electricity or wiring required.
Q What temperature range can this bimetallic gauge measure?
This bimetallic temperature gauge supports a wide measurement range from −70°C to +600°C (−94°F to 1,112°F), making it suitable for both low-temperature refrigeration systems and high-temperature industrial processes up to a maximum process temperature of 400°C.
Q What thread and connection types are available?
The gauge is available with multiple thread options including 1/4", 3/8", and 1/2" sizes, and supports PT (BSPT, ZG), BSP (G, PF), and NPT thread standards. All connections are back-mounted and can be customized as per specific project requirements.
Q Is the bimetallic thermometer suitable for outdoor or harsh environments?
Yes. The gauge is rated IP65, meaning it is fully protected against dust ingress and low-pressure water jets. It is also designed to withstand high-vibration environments and operates within an ambient temperature range of −25°C to +65°C, making it well-suited for outdoor and industrial installations.
Q Can the dial be customized with a company logo or OEM branding?
Yes. The aluminum alloy dial with white background supports full OEM and custom branding. You can have custom scale ranges, logos, or other design elements printed on the dial face according to your specifications.
Q What sizes and stem dimensions are available?
The gauge is available in six dial sizes: 50mm (2"), 60mm (2.5"), 75mm (3"), 100mm (4"), 125mm (5"), and 150mm (6"). The stem bulb diameter is either 6mm or 8mm, with stem lengths ranging from 50mm to 500mm to accommodate various installation depths and process conditions.

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