Product Overview

As a core instrument for industrial temperature measurement and control, the Bimetallic Thermometer with Electrical Contacts is designed based on the bimetallic strip thermal expansion principle, which is a well-recognized and mature temperature-sensing technology in the instrumentation field. It integrates on-site temperature display, automatic control and alarm functions, making it an essential component in industrial automation processes. Unlike traditional glass thermometers, it eliminates the risk of mercury pollution and features higher mechanical strength, ensuring stable operation in harsh industrial environments.

Our product strictly complies with national and industrial standards such as JB/T8803-1998 and GB3836-83, and also meets the international standard EN13190 for mechanical temperature measurement instruments. It is capable of directly measuring the temperature of liquid, vapor and gas media in the range of -80℃ to +500℃, with high measurement accuracy and reliable performance. The thermometer is widely used in various industries including chemical, petroleum, metallurgy, power generation, textile and pharmaceutical, providing effective temperature monitoring and control solutions for production sites that require automatic temperature control and alarm functions.

Applications

The Bimetallic Thermometer with Electrical Contacts is mainly applied in production sites that demand automatic temperature control and alarm. It can directly measure the temperature of liquid, vapor and gas media in various production processes within the range of -80℃ to +500℃. Specific application scenarios include:

Chemical industry

Temperature monitoring of reaction kettles, pipelines and storage tanks containing corrosive media.

Petroleum and natural gas industry

Temperature measurement of crude oil extraction, transportation and refining processes.

Power industry

Temperature control of boiler flue gas, steam pipelines and cooling systems in thermal power plants.

Metallurgical industry

Temperature detection in smelting furnaces, rolling equipment and heat treatment processes.

Food and pharmaceutical industry

Temperature monitoring in production processes that require strict temperature control, such as sterilization and drying.

Key Features

On-site temperature display: Equipped with a nominal diameter 100mm dial, the temperature value is clearly visible, enabling on-site operators to obtain temperature data intuitively and conveniently without additional detection equipment.

Automatic control and alarm function: With built-in electrical contact devices, it can drive relays in the circuit to act when the measured temperature reaches the upper or lower limit set points, realizing automatic power cutoff and alarm, which helps to prevent production accidents caused by abnormal temperature.

Safety and reliability with long service life: The protective tube is made of high-quality materials such as 1Cr18Ni9Ti, 304, 316, 316L stainless steel or Hastelloy C-276, which have excellent corrosion resistance and high-temperature stability. The case adopts a double-layer rubber ring thread sealing structure, achieving IP55 protection level, effectively preventing dust and water intrusion and extending the service life of the instrument.

Multiple structural forms: A variety of installation and fixing devices are available to meet different on-site installation requirements, including non-fixed device, movable external thread, movable internal thread, fixed thread, fixed flange, ferrule thread and ferrule flange.

Working Principle

The Bimetallic Thermometer with Electrical Contacts operates based on the principle that different metals have different thermal expansion coefficients. Two metal sheets with different linear expansion coefficients are combined into a bimetallic strip, which is wound into a spiral tube shape to improve temperature measurement sensitivity. One end of the bimetallic strip is fixed, and the other free end is connected to a pointer and a moving contact.

When the temperature of the measured medium changes, the bimetallic strip will bend or change its curvature due to the different thermal expansion and contraction degrees of the two metals. This deformation drives the pointer to rotate to indicate the temperature value on the dial, and at the same time drives the moving contact to move. When the moving contact touches or disconnects from the upper and lower limit fixed contacts, it triggers the action of the relay in the circuit, thereby realizing automatic temperature control and alarm functions.

Main Technical Parameters

Parameter Item	Specification
Executive Standards	JB/T8803-1998, GB3836-83
Nominal Diameter of Dial	100mm
Accuracy Class	1.0, 1.5
Thermal Response Time	≤40s
Protection Class	IP55
Normal Operating Atmospheric Conditions	Temperature: -25℃ to +55℃, Relative Humidity: ≤85%
Set Point Error	Shall not exceed 1.5 times the basic error limit
Switching Difference	The error of switching difference shall not exceed 1.5 times the basic error limit

Selection Guide

Model and Specification

Model	Temperature Measurement Range (℃)	Accuracy Class	Protection Tube Material	Specification L (mm)	Installation and Fixing Device
WSSX-400	-40~+80, 0~+50, 0~+100, 0~+150, 0~+200, 0~+300, 0~+400, 0~+500	1.5	1Cr18Ni9Ti, 304, 316, 316L, Hastelloy C-276	75, 100, 150, 200, 300, 400, 500, 750, 1000	Non-fixed Device
WSSX-410, WSSX-480, WSSX-401	-40~+80, 0~+50, 0~+100, 0~+150, 0~+200, 0~+300, 0~+400, 0~+500	1.5	1Cr18Ni9Ti, 304, 316, 316L, Hastelloy C-276	75, 100, 150, 200, 300, 400, 500, 750, 1000	Movable External Thread
WSSX-411, WSSX-481, WSSX-402	-40~+80, 0~+50, 0~+100, 0~+150, 0~+200, 0~+300, 0~+400, 0~+500	1.5	1Cr18Ni9Ti, 304, 316, 316L, Hastelloy C-276	75, 100, 150, 200, 300, 400, 500, 750, 1000	Movable Internal Thread
WSSX-412, WSSX-482, WSSX-403	-40~+80, 0~+50, 0~+100, 0~+150, 0~+200, 0~+300, 0~+400, 0~+500	1.5	1Cr18Ni9Ti, 304, 316, 316L, Hastelloy C-276	75, 100, 150, 200, 300, 400, 500, 750, 1000	Fixed Thread
WSSX-413, WSSX-483, WSSX-404	-40~+80, 0~+50, 0~+100, 0~+150, 0~+200, 0~+300, 0~+400, 0~+500	1.5	1Cr18Ni9Ti, 304, 316, 316L, Hastelloy C-276	75, 100, 150, 200, 300, 400, 500, 750, 1000	Fixed Flange
WSSX-414, WSSX-484, WSSX-405	-40~+80, 0~+50, 0~+100, 0~+150, 0~+200, 0~+300, 0~+400, 0~+500	1.5	1Cr18Ni9Ti, 304, 316, 316L, Hastelloy C-276	75, 100, 150, 200, 300, 400, 500, 750, 1000	Ferrule Thread
WSSX-415, WSSX-485, WSSX-406	-40~+80, 0~+50, 0~+100, 0~+150, 0~+200, 0~+300, 0~+400, 0~+500	1.5	1Cr18Ni9Ti, 304, 316, 316L, Hastelloy C-276	75, 100, 150, 200, 300, 400, 500, 750, 1000	Ferrule Flange

Selection Notes

1. When selecting the model, please confirm the actual temperature measurement range of the on-site medium to ensure it matches the temperature range of the thermometer.

2. Choose the appropriate protection tube material according to the corrosion of the measured medium. For example, Hastelloy C-276 is recommended for strong corrosive media such as sulfuric acid and hydrochloric acid.

3. Determine the specification L (insertion length) based on the thickness of the on-site equipment or pipeline to ensure accurate temperature measurement.

4. Select the installation and fixing device according to the on-site installation environment and requirements, such as fixed flange for large-diameter pipelines and thread connection for small-diameter pipelines.

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