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Industrial Bimetallic Thermometers

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Industrial Bimetallic Thermometers
Details
Industrial bimetallic thermometers are professional on-site detection instruments specifically designed for medium and low-temperature measurement in industrial environments. Leveraging the principle of differential thermal expansion between two bonded metal strips with distinct expansion coefficients , these thermometers convert temperature changes into mechanical deflection, driving a pointer to provide real-time, intuitive temperature readings for gases, liquids, and steam . With a measurement range typically spanning from -80℃ to +500℃ , they have become indispensable tools across various industrial sectors, offering a safe, durable, and cost-effective alternative to traditional mercury thermometers.
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Temperature Measuring Instruments
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Description
 

Product Introduction

 

At the core of an industrial bimetallic thermometer is a spiral-wound bimetallic sensing element. When exposed to temperature fluctuations, the two metals expand or contract at different rates, causing the element to bend and rotate the free end-which in turn moves the pointer on the dial to display the exact temperature . This mechanical operation eliminates the need for external power sources, ensuring reliable performance even in harsh or power-constrained environments.

 

These thermometers are highly customizable to meet diverse installation requirements. Structurally, they are classified into four main types based on the connection angle between the dial and the protective tube:

Axial Type

The dial is perpendicular to the protective tube, ideal for installations where space is limited and front-facing reading is required.

01

Radial Type

The dial is parallel to the protective tube, suitable for direct horizontal mounting and easy observation from the side.

02

135° Type

The dial forms a 135° angle with the protective tube, designed for scenarios where neither axial nor radial mounting provides optimal readability.

03

Universal Type

The dial angle can be freely adjusted, offering maximum flexibility for complex installation environments.

04

 

Additionally, they are categorized by application scenarios into General Type, Outdoor Type, and Corrosion-Resistant Type , with the latter featuring specialized materials like 1Cr18Ni9Ti stainless steel or molybdenum-titanium alloy protective tubes to withstand aggressive media . For enhanced safety and control, models equipped with electric contacts can automatically trigger power cutoff or alarm signals when temperatures exceed preset thresholds .

 

 

Key Features

Industrial bimetallic thermometers stand out for their comprehensive performance advantages, making them a preferred choice for industrial temperature measurement:

Mercury-Free Safety

Eliminates mercury pollution risks, complying with environmental and occupational health standards.

Intuitive Readability

Large, clear dials with precise graduations ensure quick and accurate readings, even for on-site operators wearing protective gear.

Robust Environmental Resistance

The stainless steel casing (typically 304 stainless steel) provides IP65 or IP67 ingress protection , delivering excellent waterproof, dustproof, and corrosion-resistant performance. They also exhibit strong vibration resistance, maintaining accuracy in high-vibration settings such as machinery or pumps.

High Accuracy and Stability

Available in accuracy classes 1.0 and 1.5 , with some premium models reaching ±1% full-scale accuracy (ASME B40.3 Grade A) . The time constant is as low as 30 seconds for φ6mm protective tubes, ensuring rapid response to temperature changes.

Durable and Low-Maintenance

The all-metal construction withstands nominal pressures up to 6.4MPa and features an overload capacity of 110% of full-scale deflection , with a long service life and minimal upkeep needs.

Easy Calibration

Most models are equipped with external calibration screws on the back of the dial, allowing on-site calibration using simple ice-point (0℃) or boiling-point (100℃) methods.

 

 

Industry Applications

Thanks to their versatility and reliability, these thermometers are widely used in numerous industrial and research sectors:

 

Power Generation

Monitoring temperatures of steam, cooling water, and lubricating oil in thermal, nuclear, and hydro power stations.

 

Petroleum and Chemicals

Measuring temperatures of crude oil, chemical reagents, and process fluids in refineries, reactors, and pipelines-with corrosion-resistant models suited for acidic or alkaline media.

 

Food and Beverage

Ensuring precise temperature control in brewing, dairy processing, and food drying, adhering to hygienic and safety regulations.

 

Mechanical and Manufacturing

Monitoring equipment temperatures in engines, compressors, and industrial ovens to prevent overheating and equipment failure.

 

Textile and Printing

Controlling temperature in dyeing vats and drying machines to maintain product quality.

 

Scientific Research

Providing stable temperature data in laboratories for material testing and process development.

 

 

FAQ

 

Q1: What causes inaccurate readings, and how can I fix them?

A1: Inaccuracy often stems from improper installation or component wear. If the thermometer is installed too shallowly, the sensing element may not fully contact the measured medium-adjust the insertion depth to ensure complete immersion . Corroded bimetallic elements or worn gears can also affect precision: inspect the element regularly in corrosive environments and replace worn parts as needed . For minor deviations, recalibrate using the ice-point method (submerge the sensing element in a slushy ice-water mixture and adjust the calibration screw to 0℃).

Q2: How often should I calibrate my bimetallic thermometer?

A2: Calibration frequency depends on usage conditions. For general industrial applications, calibration every 6–12 months is recommended. In critical sectors like food processing or pharmaceuticals (where compliance is mandatory) or environments with frequent temperature shocks, monthly calibration may be necessary . Always recalibrate immediately if inaccurate readings are suspected or after the thermometer is exposed to extreme temperatures.

Q3: Can a standard bimetallic thermometer be used in corrosive environments?

A3: No. Standard models are not designed for aggressive media. Choose the Corrosion-Resistant Type with stainless steel or molybdenum-titanium protective tubes. If the environment is both corrosive and high-pressure, ensure the thermometer's nominal pressure rating (typically up to 6.4MPa) meets your system requirements.

Q4: What should I do if the pointer stops moving?

A4: First, check for internal blockages-dust or impurities may jam the transmission gears. Carefully open the casing and clean the components . If cleaning does not work, inspect the gears for severe wear; replacement may be required . Also, check the protective tube for cracks: a broken tube can expose the sensing element to corrosion or damage, necessitating immediate replacement.

Q5: Are bimetallic thermometers suitable for low-temperature applications?

A5: Yes. Most models cover a range as low as -80℃ , making them suitable for cryogenic scenarios such as refrigeration systems or low-temperature material storage. For temperatures below -80℃, consult the manufacturer for specialized low-temperature models.

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