Bimetallic thermometers are a device equipped with a steel case, which is coated with chrome, as well as with a thermoballoon made of brass, where the element (spring or plate) is sensitive. There is also a kinematic mechanism with a dial and an arrow located under a protective durable glass. Conventional bimetallic thermometers can show temperatures in the region from -70 to 600 degrees Celsius. All devices are divided into two categories: radial and axial. The first characterizes the location of the axis at an angle of 90 degrees to the axis of the bulb, and the second - a parallel arrangement to the same axis. Our selection includes several current models that exist in the domestic market. For the convenience of choice, we dwell on the features, basic characteristics, as well as the strengths and weaknesses of each.
Content:
BT-31.211 - affordable model of domestic production
The bimetallic thermometer is manufactured in Russia at CJSC Rosma. The model is widely used due to its long service life and ease of use. It is suitable for use in air conditioning systems, heating installations, ventilation.
In everyday life suitable for smokehouse and moonshine. With high accuracy (class 2.5), a bimetallic thermometer measures the temperature of gases and liquids. It has an axial connection. The degree of protection against dust and moisture corresponds to IP43.
The case is made of corrosion-resistant steel, the case is made of brass or stainless steel, the dial is aluminum with a white background and black scale, and the protective glass is mineral, characterized by high strength.
Advantages:
- wide range of applications;
- case diameter - 63 mm;
- corrosion resistant steel;
- the interval between checks is 2 years;
- budget cost - 415 p.
Disadvantages:
- not found.
BT-7 - the best value for money
One more model of a bimetallic thermometer of Russian production from Rosma CJSC. Designed to measure temperatures in industrial industrial installations for technical purposes.
Spectrum includes: gas, liquid, steam, oil, air. It can be used in heating, ventilation and air conditioning systems, as well as in food production and in sanitary installations. With high accuracy determines the temperature, class 1.5.
IP43 protection against moisture and dust. It has an axial location of the nozzle. The body is made of corrosion resistant steel.
The dial is made of white painted aluminum alloy. Sleeve brass or stainless steel. Safety glass from technical material. The limit of temperature measurement is from -40 to 450 degrees.
Advantages:
- wide range of applications;
- case diameter - 150 mm;
- inspection interval - 2 years;
- acceptable price - 700 p.
Disadvantages:
- not found.
TB8 - a model for working in harsh environments
A bimetallic thermometer is designed to withstand harsh operating conditions. Due to the welding around the circumference with a tungsten electrode in the inert gas medium of the flask and the body, the entire structure is strengthened.
Due to the exact fit, any leaks are eliminated during the filling of the device with damping fluid, which prevents breakage due to vibration. It has a high accuracy class - 1. The body is made of durable stainless steel.
Laminated safety glass ensures the safety of the thermometer. The degree of protection against dust and moisture corresponds to IP65.Used in the petrochemical, chemical, energy, gas industry, as well as for construction and design.
Advantages:
- meets the basic requirements of occupational health and safety specified in the European directive;
- comfortable and convenient work;
- local indication function;
- possibility of mounting on any complex equipment;
- temperature limit from -50 to 600 degrees;
- acceptable price - 700 p.
Disadvantages:
- not found.
Watts FR810 - surface type model
Bimetallic thermometer of this series is designed to measure the temperature of coolants in piping heating systems. The model is a sealed case in which is placed a plate made of two different pressed metals.
During a temperature change, it begins to deform, indicating the exact value. The index arrow turns the shaft to which one end of the plate is attached, the other end is in a stationary position.
Advantages:
- diameter selection - from 30 to 65 mm (spring) and from 30 to 75 mm (copper tape);
- not subject to mandatory certification;
- temperature range - 120 degrees;
- accuracy class - 2;
- low cost - 400 p.
Disadvantages:
- not found.
Watts F + R828 - radial bimetal thermometer
Bimetallic thermometer belongs to the radial group. The case of the model is made of durable plastic. The dial is protected by tempered glass. It has a high class of measurement accuracy - 2 (temperature) and 2.5 (pressure).
The index arrow is colored red. There is an automatic shut-off valve 1/2 ". It works within 0-4 bar. Suitable for domestic use, where there is no aggressive influence of the external environment.
Advantages:
- case diameter - 80 mm;
- temperature measurement range - 120.
Disadvantages:
- relatively expensive - 1 thousand rubles.
Watts MTG - alcohol bimetal thermometer
Bimetallic thermometer applies to alcohol, series MTW (in the form of an angle), MTG (straight), and there are also V-shaped ones. The case is equipped with a black dial with a white scale.
The diameter of the capillary prismatic tube, which is filled with blue toluene, is 6 mm. Measurement takes place in the range from 0 to 160 degrees. On request, the manufacturer manufactures bimetallic thermometers of this series for other temperature ranges.
Advantages:
- medium working pressure - up to 16 bar;
- high accuracy of readings - error in the region of 2 degrees;
- connecting thread - 1/2 ";
- the union - 50 mm.
Disadvantages:
- high cost - 1600 p.
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