Types of Industrial Thermometer

Types of Industrial Thermometer

Thermometers are devices that measure temperature or a temperature gradient using a variety of different principles. Temperature is simply the numerical measurement of hot and cold—which has great importance in a wide variety of applications.

Temperature affects our comfort, cooks our food and is critical to making many products upon which we rely. Given the extreme importance of temperature across so many aspects of modern life, thermometers are a familiar tool to us.

Temperature is the most commonly measured parameter in commercial and industrial settings. Industries as diverse as food processing, pharmaceuticals, cold storage, paper manufacturing, and others absolutely rely on process temperatures being within a certain range.

Though there are many temperature sensing options, thermometers provide an inexpensive, versatile and reliable choice.

Gas-actuated Thermometers

The Gas-actuated-thermometers are suitable for raw ambient conditions. A case, ring, and stem are made of stainless steel. With a liquid filling, the thermometers can be used at measuring points with high vibrations.

The thermometers with capillary facilitate separation of the display unit from the measuring point. The measuring system in the gas thermometers consists of the stem, capillary and Bourdon tube in a case.

The complete measuring system is filled with an inert gas under pressure. A temperature change causes the internal pressure in the stem to change. The deflection of the Bourdon tube thus caused is transmitted to the pointer by a movement.

A version with rotatable (360°) and turntable case (90°) allow the thermometers to be aligned as desired under all installation conditions. In conjunction with a corresponding thermowell, these thermometers can also be used with aggressive media or high process-pressures.

Gas-actuated Thermometers Application

• Chemical and petrochemical industry
• Process engineering
• Food industry

Technical Data

Measuring ranges

-200 … 50 °C to 0 … 700°C

Mounting

• With Capillary
• Without Capillary

Bimetal Thermometer

Bimetal thermometers use two strips of different metals to convert temperature into mechanical displacement. The different metals, often steel and copper or steel and brass, are joined together throughout their length and will expand at different rates as they are heated.

The difference in the expansion will cause the strip to bend one way if heated or the other if cooled. This movement correlates to the actual temperature and moves an indicator along the scale. The metal strips can be lengthened for sensitivity and are often coiled for compactness.

Bimetal thermometers are inexpensive, simple, and durable. As purely mechanical devices, they display only the current temperature on their dial. They can be accurate to about 1% full span. They are often used in food and beverage preparation, process temperature measurement, wastewater treatment, boiler systems, and other places.

Bimetal Thermometer Application

• chemical
• petrochemical
• oil and gas
• energy
• water/wastewater industries