Bimetallic thermometers are used to measure the temperature of liquids and gases, as well as loose and viscous media. The bimetallic thermometer is designed to measure the temperature of liquids and gases in heating and sanitary installations, in air conditioning and ventilation systems. A bimetallic spring is used as a sensitive element.
General technical thermometers (axial connection)
Bimetallic thermometers are used to measure the temperature of liquids and gases, as well as loose and viscous media.
The bimetallic thermometer is designed to measure the temperature of liquids and gases in heating and sanitary installations, in air conditioning and ventilation systems.
The principle of operation of BT thermometers is based on the dependence of the deformation of the sensitive element on the measured temperature.
Application area: air conditioning systems, heat supply, water supply. When measuring the temperature of aggressive media, it is recommended to complete the thermometer with a stainless steel sleeve.
General technical thermometers (radial connection)
The radial bimetallic thermometer is designed to measure the temperature of liquids, steam and gases in heating and sanitary installations, in air conditioning and ventilation systems. The principle of operation of BT thermometers is based on the dependence of the deformation of the sensitive element on the measured temperature.
A bimetallic spring is used as a sensitive element. The bimetallic spring is made of two firmly connected metal plates with different temperature coefficients of linear expansion.
The body of the thermometer is made of stainless steel, the stem is made of stainless steel.
Application area: air conditioning systems, heat supply, water supply.
When measuring the temperature of aggressive media, it is recommended to complete the thermometer with a stainless steel sleeve.
Corrosion resistant thermometers (axial connection)
Corrosion-resistant thermometer with axial connection is designed to measure the temperature of aggressive liquids and gases. The principle of operation of BT thermometers is based on the dependence of the deformation of the sensitive element on the measured temperature. A bimetallic spring is used as a sensitive element. The bimetallic spring is made of two firmly connected metal plates with different temperature coefficients of linear expansion.
Application area:
Corrosion resistant thermometers (radial connection)
Corrosion-resistant thermometer with radial connection is designed to measure the temperature of aggressive liquids and gases.
The principle of operation of BT thermometers is based on the dependence of the deformation of the sensitive element on the measured temperature. A bimetallic spring is used as a sensitive element. The bimetallic spring is made of two firmly connected metal plates with different temperature coefficients of linear expansion.
The body and stem of the corrosion-resistant thermometer are made of stainless steel. The thermometer can be equipped with a stainless steel sleeve.
Application area: chemical industry, petrochemical industry, mechanical engineering.
Corrosion resistant thermometers (universal connection)
Corrosion-resistant thermometer with a universal (tilt-and-turn housing) connection is designed to measure the temperature of aggressive liquids and gases.
The principle of operation of BT thermometers is based on the dependence of the deformation of the sensitive element on the measured temperature.
The body and stem of the corrosion-resistant thermometer are made of stainless steel. The thermometer can be equipped with a stainless steel sleeve.
Application area: chemical industry, petrochemical industry, mechanical engineering.
Axial bimetallic thermometerBimetallic radial thermometer designed to measure the temperature of liquids and gases in heating and sanitary installations, in air conditioning and ventilation systems. The principle of operation of BT thermometers is based on the dependence of the deformation of the sensitive element on the measured temperature. A bimetallic spring is used as a sensitive element. The bimetallic spring is made of two firmly connected metal plates with different temperature coefficients of linear expansion. When the temperature changes, the spring bends and rotates the thermometer needle. One end of the spring is fixed inside the stem, and the arrow axis is attached to the other.
Corrosion-resistant thermometer with axial connection
Corrosion-resistant thermometer with radial connection designed to measure the temperature of aggressive liquids and gases. The principle of operation of BT thermometers is based on the dependence of the deformation of the sensitive element on the measured temperature. A bimetallic spring is used as a sensitive element.
The body and stem of the vibration-resistant thermometer are made of stainless steel. The thermometer can be equipped with a stainless steel sleeve
Corrosion-resistant thermometer with universal (swing-out housing) connection designed to measure the temperature of aggressive liquids and gases. The principle of operation of BT thermometers is based on the dependence of the deformation of the sensitive element on the measured temperature. A bimetallic spring is used as a sensitive element.
Thermometer bimetallic consignment note (thermometer with spring) designed to measure the temperature of the pipe surface. The principle of operation of BT thermometers is based on the dependence of the deformation of the sensitive element on the measured temperature. A bimetallic spring is used as a sensitive element. The case of the device is made of corrosion-resistant steel.
Bimetal corrosion-resistant thermometer with a stem in the form of a needle (immersion thermometer) designed to measure the temperature of thick, loose and viscous media. The principle of operation of BT thermometers is based on the dependence of the deformation of the sensitive element on the measured temperature. A bimetallic spring is used as a sensitive element. Bimetallic needle thermometers are used in agriculture, construction (including for measuring the temperature of concrete).
Technical liquid thermometer designed to measure the temperature of non-aggressive liquid and gaseous media under vibration conditions in various industries within the range from -30 to +600 °C.
The thermometers consist of a glass-encased capillary tube with a reservoir filled with thermometric liquid, a protective housing and a protective sleeve. The thermometer scale is printed on the outer surface of the capillary tube. The upper part of the capillary tube (with a scale) is located in the body, and the lower part (with a reservoir) is in the sleeve.
The body is made of anodized aluminium. The sleeve is made either from brass (for thermometers with an upper measurement limit of up to 200 °C), or from nickel-plated steel (for thermometers with a measurement range of 0 ... 600 °C), or from stainless steel (on request). Depending on the type of connection, two versions are produced: an angle thermometer and a straight thermometer.
Bimetallic thermometer (hereinafter referred to as TB/BT) can be used to measure the temperature of the medium in the range from -60°С to +500°С, and the state of aggregation of the measured medium can be practically any:
- liquid: non-aggressive (water) and moderately aggressive (when using a thermal bulb or a protective sleeve made of stainless steel);
— solid body: surface, for clamping versions (pipe TB/BT) or loose medium (needle TB/BT);
— gas: gaseous media and gas mixtures (air, natural or welding gas);
— steam: water or any other non-corrosive steam with respect to the bulb and thermowell materials.
The versatility of bimetallic thermometers TB / BT, the simplicity of their design, relative reliability and low cost explain the breadth of their application: from industrial installations of increased reliability (in the UAE) to use in everyday life as room or bath thermometers.
The design and principle of operation of the bimetallic thermometer TB / BT
Bimetal thermometer TB/BT usually has a round (rarely semicircular or square) case, where a dial (scale) and a kinematic mechanism with an arrow are placed, connected and a bimetallic temperature-sensitive element in a protective tube (thermobalon), which reacts to temperature changes, which is reflected with some inertia in the form of arrow readings .
Operating principle bimetallic thermometer TB / BT is based on elastic deformation, which occurs under the influence of the temperature of two metal plates, firmly interconnected, which have different temperature coefficients of linear expansion. In this case, the bimetallic strip is bent (twisted) towards the material, the coefficient of linear expansion of which is less. As a result of such deformation, with the help of a kinematic unit, the bend is converted into a rotational movement of the arrow, which, in turn, shows on the thermometer scale the value of the temperature of the measured medium - Tis.
The disadvantages of bimetallic thermometers TB / BT, relative to liquid glass TTZH (alcohol) and TTP (mercury) are a large inertia (time spent on heating the bulb and protective sleeve) and several times higher cost (due to the relative complexity of the design). But these shortcomings are fully compensated by their structural strength, vibration resistance and clarity of indications.
Classification of types of bimetallic thermometers BT / TB industrial versions
According to the location of the thermal bulb:
— Radial (thermal bulb from below along the radius — the dial axis is located perpendicularly at an angle of 90 degrees with respect to the bulb axis);
— Axial-axial (thermal bulb behind the axis (eng.-axis), the axis of the dial and the bulb coincides (coaxial));
- Tilt and turn (universal radial-axial, having a rotary mechanism).
According to the type of thermocylinder, the following varieties are possible:
- Pipe thermometers, which measure the temperature on the surface of pipes in heating systems (thermal bulb is built into the housing, which is pressed against the pipe by a spring);
- Needle thermometers, which measure the temperature when a special probe needle is immersed in the measurement medium.
More about the brands supplied by bimetallic thermometers TB / BT, as well as their technical characteristics, selection principles (see how to choose, order and buy cheap TB / BT), areas of application, prices (see price list), availability in stock or production times see below.
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TB-63, -80, -100 - indicating, axial and radial, case chrom.steel 63/80/100mm, L immersion. 50/100/60mm, class.t. 1/1.5/2.5, Di -35…+600°С, c.d. scale 0.5/1.0/2.0/5.0/10.0 °С, fitting thread 5 or G1/2 |
TBT-63 - pipe indicating, D 63mm, pipe mounting on a spring, Di 0 ... + 120 / 0 ... + 150ºС, c.d. scale 1; 2ºС, class 2.5, case - steel |
Bimetallic thermometers TB-ros: axial bulb (rear, end-T) or radial-R (bottom), body diameter 60, 80, 100, 150 mm, accuracy class 2.5-1.5%, 12 ranges from -50 to +600C, Tos -40+60C, L stem from 46 to 300mm (stainless steel, D=8mm) in a kit with a brass protective sleeve (fitting G1 / 2 or M20x1.5), on request it is possible to complete with a flange or stainless steel sleeve . become. |
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TBI-25, -40 - needle, axial, stainless steel body and probe, IP65, D 25.40mm, probe L up to 250mm, Di -40 ... + 400ºС, class 2.5, Tos -55 ... + 70ºС |
Axial bulb (rear, end-T), case diameter 63, 80, 100, 150 mm, class. t. 1.5-2.5%, 10 ranges from -40 to +450°C, IP43, working pressure 2.5;10;25 MPa, Tos -10+60°C, L rod from 46 to 300 mm complete with brass protective sleeve (fitting G1/2 or M20x1.5), body - corrosion-resistant steel |
DMT-05080 — thermomanometer, D=80mm, axial O/radial R fitting, class 2.5%, DiT 0…+120°С; 0…+150°С, DiP 0…0.4; 0.6; one; 1.6; 2.5; 4 MPa, Tos -40+70°С, IP53 |
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Thermal bulb axial (rear, end-T) or radial-P (bottom) threadless: body diameter 63, 100, 160 mm, class. t. 1.5-2.5%, 10 ranges from -20 to +500 °С, degree of protection IP51, climatic version U1, Tos -60 + 60С, L of the rod from 50 to 800 mm, fitting Ø9mm, complete with protective sleeve made of brass, housing - galvanized steel |
Indicating bimetallic thermometers TB-1, TB-2, TB-3: for liquid and gaseous media, general industrial, for ships and for nuclear power plants, axial bulb (rear, end-T) or radial-R (bottom) 6-10 mm, case diameter 60, 100, 160 mm, class. t. 1.5-2.5%, 1.0% (on request), 15 ranges from -20 to +400 °С, degree of protection IP54, climatic version UHL 2, OM5, Tos -60+50С, L rod from 80 to 315 mm, measured medium pressure 64-250, vibration resistance from 5 to 100 Hz. |
bimetallic electrocontact thermometer TB-E: thermocylinder axial-T (rear, end) or radial-R (bottom), case diameter 100, 150 mm, class. t. 1%, ranges T= -50…+600С, Tos -40+60С, L of rod =35…1000mm (stainless steel, D=8mm), fitting G1/2 or M20x1.5, contacts with magnetic compression, material - stainless steel. |
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thermomanometer (manometer with thermometer) — D=80, 100mm; class t 2.5%; DiT 0…+120°С, 0…+150°С; DiP 0…0.25; 0.4; 0.6; one; 1.6; 2.5 MPa; Tos -50+60°С; connection thread G½; IP42 |
corrosion-resistant axial thermometer -T (rear, end), case diameter 100, 150mm, class. t. 1.5%, 1%, ranges T = -30 ... + 450С, Tos -60 + 60С, L of the rod = 46 ... 300mm, fitting G1 / 2, IP 54, CHE - bimetallic spiral, material - stainless steel. |
BT-32/52-211 bimetallic radial thermometers: D=63, 100mm, class. t. 2.5%, 1.5%, ranges T = -30 ... + 450ºС, Tos -10 + 60ºС, Rod L = 46 ... 300mm, fitting G1 / 2, 20x1.5, IP 43,ChE - bimetallic spiral , material — corrosion-resistant steel. |
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Thermocylinder axial -T or radial - P threadless, corrosion-resistant: body diameter 63, 100, 160 mm, class. t. 1.5-2.5%, 10 ranges from -20 to +500 °С, degree of protection IP65, climatic version UHL1, Tos -60+60С, L of the rod from 50 to 800 mm, fitting Ø9mm, complete with stainless steel thermowell, stainless steel housing |
Swing-out thermocylinder (universal location of the fitting), corrosion-resistant: body diameter 100, 160 mm; class t. 1.5%, 1%; 11 ranges from -20 to +500 °С; degree of protection IP65; climatic version UHL1; Tos -60+60С; L rod from 50 to 800 mm; fitting Ø8mm; thread G½, M20x1.5, ½NPT; body - stainless steel |
Axial thermometer -T or radial - P, special for ventilation and air conditioning: case diameter 63, 100, 160 mm, class. t. 1.5-2.5%, 5 ranges from -50 to +120 °С, degree of protection IP51, climatic version U2, Tos -60 + 60С, L of the rod from 50 to 800 mm, fitting Ø9mm brass, complete with a flange for mounting on 3 holes, body - galvanized steel Axial thermometer - T or radial - P, general technical: D: 63, 100 mm, class. t. 1.5-2.5%, CI: from -40 to +450 ° С, degree of protection IP54, climatic version UHL1, Tos -70 + 60С, L sleeves from 46, 64.100 mm - Ø9mm copper alloy, sleeve thread G½, body - corrosion-resistant steel. |
Options, additional equipment and accessories for TB/BT thermometers
- Protective sleeve made of stainless steel (instead of brass usually included in the kit).
— End flange (for thin-walled and non-pressure systems), brass material.
- Mounting boss straight (weld-in adapter for thick-walled pressure systems for welding).
- Full bore ball valve (not recommended, because it is more correct to mount in a protective sleeve).
— Gaskets/seals (copper, fluoroplastic, paranitic, rubber, etc. depending on pressure and temperature).
- Critical temperature indicator (red arrow-diabetic).
- Heat transfer fluid or lubricant (gel) to ensure heat transfer from the sleeve to the bulb.
— Spare parts and accessories - spare parts and accessories (mechanisms, arrows, dial / scales, etc.).
Brands of supplied bimetallic (mechanical) indicating thermometers
This section presents bimetallic mechanical indicating thermometers TB (TB1, TB2, TB3, TB4, TB5), BT (BT111, BT211, BT220), TBP (TBP-63, TBP-100, TBP-160), household bimetallic thermometers, protective sleeves, etc.
TB-63,-80,-100,-150-T(R)– bimetallic indicating thermometers (Т=-50…+600С, body diameter TB-63, 80, 100, 150mm, use - axial (rear, end-“T”) or radial (“R”, bottom) location of the bulb, accuracy class 1.5; 2.5%, sleeve thread G1 / 2, M20x1.5 (brass), rod length (thermal bulb): 35, 46, 64, 100, 150, 200, 250, 300, 350mm, diameter 8mm ).
TB-1– bimetallic indicating thermometer (Т=-50…+400С, diameter 60 mm, use - axial or radial (TB-1R) location of the thermocylinder, accuracy class 1.5; 2.5%, thread M16, M18, M20, M27) .
TB-2- bimetallic indicating thermometer (diameter 100 mm, use - axial or radial (TB-2R) location of the bulb, accuracy class 1.5; 2.5%, thread M16, M18, M20, M27).
TB-3(-4, -5)- bimetallic indicating thermometer (permissible operating pressure up to 6 MPa; including aggressive environment; case diameter 80, 100, 160 mm).
BT-111(-211, -220 (corrosion resistant))– bimetallic indicating thermometers (Т=-40+450С, case diameter 63mm (CL.t. 2.5%), 80, 100, 150mm (CL.t. 1.5%); radial or axial connection, connecting thread of the sleeve — G1/2 (basic version)).
TBP- bimetallic indicating thermometer (T = -20 + 400С, body diameter TBP63 - 63mm, TBP100 - 100mm, TBP160 - 160mm; fitting location: central-axial (T) or radial (P) - corrosion-resistant version is possible, accuracy class 2.5 %, connecting thread of the sleeve - G1 / 2 (basic version)).
Protective sleeves (up to 25MPa (250kgf/cm2)).
Bimetal thermometers. household(room, office, window, bath).
It is also possible to supply other brands of technical and special bimetal. thermometers.
Indicating thermometer - a device for measuring temperature in various industrial enterprises. Bimetallic thermometer (BT thermometer) refers to technical instruments designed to measure the temperature of liquids and gases in heating and sanitary installations, air conditioning and ventilation systems, as well as to measure the temperature of bulk and viscous media in the food industry.
The principle of operation of a technical thermometer is based on the dependence of the deformation of the sensitive element (bimetallic spring) on the measured temperature. The spring is made of two firmly connected metal plates, which have different temperature coefficients of linear expansion. When the temperature changes, the spring flexes and rotates the thermometer needle. One end of the bimetallic spring is fixed inside the stem, and an arrow is attached to the other (except for contact thermometers with a spring for mounting on a pipe, in which the bimetallic spring is wound around the axis of the contact element, and the arrow is fixed directly on the bimetal).
Depending on the type of connection of the stem to the body, BT thermometers are divided into rear (axial) and radial. The case of the device is made of chrome-plated or stainless steel. The stem material is brass or stainless steel.
Thermometer modifications
Industrial thermometer BT can be produced in several modifications, which differ in design and materials of components:
- general technical series 211 with a chrome steel body and a stainless steel stem;
- general technical special with a galvanized steel body and a spring for mounting on a pipe;
- general technical special made of stainless steel and a stem in the form of a needle;
- corrosion resistant series 220 stainless steel.
The thermometer bimetallic is completed with a brass protective sleeve with a carving. The exceptions are technical thermometers BT of corrosion-resistant design (series 220) with a stem, ring and case made of stainless steel, as well as general technical special thermometers (with a measuring element in the form of a needle and contact BT with a spring for mounting on a pipe). The industrial corrosion-resistant thermometer of the 220 series has a thread on the stem, and the protective sleeve is not included in the standard delivery.
