WSS-311 Radial bimetallic thermometerDetailed product description：

WSS-311 Radial Bimetallic Temperature Gauge Introduction: The main component of an industrial bimetallic thermometer is a multi-layer metal sheet composed of two or more metal sheets stacked together. An instrument that can automatically and continuously record changes. To improve temperature sensitivity, metal sheets are usually made into a spiral coil shape. When the temperature of multi-layer metal sheets changes, the expansion or contraction of each layer of metal is uneven, causing the spiral coil to roll up or loosen. Due to one end of the spiral coil being fixed and the other end being connected to a freely rotating pointer, the two metals undergo different changes in volume when the temperature changes, resulting in bending. One end of it is fixed, and the other end undergoes displacement with temperature changes, with the displacement being close to a linear relationship with the temperature. The self recording system consists of a self recording clock and a self recording pen. The self recording pen is connected to an amplifying lever and is operated by a sensing element. Therefore, when the bimetallic plate senses a temperature change, the pointer can indicate the temperature on a circular dividing scale. The temperature measurement range of this instrument is 200~650 ℃, and it is allowed to be around 1% of the two ranges of the ruler. This thermometer has a similar purpose as a rod-shaped glass liquid thermometer, but can be used under conditions with higher strength requirements.
principle

It works by utilizing the principle that two different metals expand differently when the temperature changes. The main component of industrial bimetallic thermometers is a multi-layer metal sheet composed of two or more metal sheets stacked together. To improve temperature sensitivity, metal sheets are usually made into a spiral coil shape. When the temperature of multi-layer metal sheets changes, the expansion or contraction of each layer of metal is uneven, causing the spiral coil to roll up or loosen. Due to one end of the spiral coil being fixed and the other end being connected to a freely rotatable pointer, when the bimetallic strip senses a temperature change, the pointer can indicate the temperature on a circular scale. The temperature measurement range of this instrument is 200~650 ℃, and the allowable error is about 1% of the scale's two strokes. This thermometer has a similar purpose as a rod-shaped glass liquid thermometer, but can be used under conditions that require higher mechanical strength.

application
Bimetallic thermometer is a field detection instrument suitable for measuring medium and low temperatures, which can be used to directly measure the temperature of liquefied and gas. Comparison between bimetallic thermometers and similar domestic products: The instrument accuracy level reaches 1.0 level, and the upper shell of the instrument is made of anti-corrosion materials. Its temperature resistance can reach up to 200 ℃, with a minimum of -40 ℃. The flange structure and double-layer sealing rubber ring have good anti-corrosion and waterproof performance. The welding of the protective tube adopts fully automatic argon gas protective tube, with a firm weld and minimal intergranular corrosion. The scale plate is an aluminum oxide printing plate with a clear and aesthetically pleasing surface. The pointer is internally adjustable. Bimetallic thermometers are available in axial, radial, universal, and other types The length of the probe of the bimetallic thermometer can be customized according to customer needs. On site temperature display, intuitive, convenient, safe and reliable, with a long service life; The core pulling thermometer can be maintained or replaced for a short period of time without stopping the machine. Axial type, radial type, 135º There are a complete range of types such as universal type and universal type, which are suitable for various on-site installation needs. The bimetallic thermocouple integrated thermometer (transmitter) and electric contact core pulling protection type bimetallic thermocouple integrated thermometer and transmitter are instruments based on the bimetallic thermometer series products, which are equipped with armored thermocouple in parallel inside the sleeve. By using this table, the indicated values can be clearly seen on site, and the signal can be transmitted remotely to the control room. The signals transmitted to the control room include platinum resistance Pt10, K-type E-type thermocouple signals, and also converted into 4-20mA standard signals, which serve as a dual-purpose meter. Using this meter can save one hole and one leakage point on the pipeline (which often occurs at the opening due to accidents), and its price is cheaper than using two meters. So, this table has both practical and economic value. (Platinum thermistors also have non armored types)
A bimetallic thermometer operates based on the principle that two different metals expand differently when the temperature changes.
The main component of industrial bimetallic thermometers is a multi-layer metal sheet composed of two or more metal sheets stacked together.
To improve temperature sensitivity, metal sheets are usually made into a spiral coil shape. When the temperature of multi-layer metal sheets changes, the expansion or contraction of each layer of metal is uneven, causing the spiral coil to roll up or loosen.
Due to one end of the spiral coil being fixed and the other end being connected to a freely rotatable pointer, when the bimetallic strip senses a temperature change, the pointer can indicate the temperature on a circular scale.
The temperature measurement range of this instrument is 200~650 ℃, and the allowable error is about 1% of the scale's two strokes.
This thermometer has a similar purpose as a rod-shaped glass liquid thermometer, but can be used under conditions that require higher mechanical strength.
The WSS series bimetallic thermometer is an on-site detection instrument for measuring low and medium temperatures. Bimetallic thermometers can directly measure the temperature of liquid, vapor, and gas media within the range of -80 ℃ to+500 ℃ in various production processes.
Main Features
1. On site temperature display, intuitive and convenient; Safe and reliable, with a long service life;
2. Multiple structural forms can meet different requirements.
working principle
A bimetallic thermometer is composed of bimetallic sheets wound in a circular curved shape. When one end expands due to heat, it drives the pointer to rotate, and the working instrument displays the corresponding temperature value.
Technical parameters

Execute standard JB/T8803-1998 GB3836-83
Scale dial nominal diameter: 60100150
Accuracy level: (1.0), 1.5
Thermal response time: ≤ 40S
Protection level: IP55
Angle adjustment error: The angle adjustment error should not exceed 1.0% of its range
Return difference: The return difference of the bimetallic thermometer should not exceed the absolute value of the basic error limit
Repeatability: The repeatability limit range of bimetallic thermometers should not exceed 1/2 of the absolute value of the basic error limit. Main technical parameters
·Product execution standard: JB/T8803-1998? GB3836-83
·Scale dial nominal diameter: 60100150
·Accuracy level: (1.0), 1.5
·Thermal response time: ≤ 40S
·Protection level: IP55
·Angle adjustment error: The angle adjustment error should not exceed 1.0% of its range
·Return difference: The thermometer return difference should not exceed the absolute value of the basic error limit
·Repeatability: The repeatability limit range of the thermometer should not exceed 1/2 of the absolute value of the basic error limit

Normal working atmospheric conditions
Workplace temperature ℃ Relative temperature%
Shelters -25-+25 5-100
Outdoor venue -40-+85 5-100

Model naming method
W temperature instrument
S metal expansion type
S temperature sensing element bimetallic sheet
X electrical contact structure
Nominal diameter of the watch case
4 100

positional features
0 axis (straight type)
1 Radial (angular)
8 universal (adjustable angle type)
Install fixed devices
0 No fixed device
1. Movable external thread
2 movable internal threads
3 fixed threads
4 Fixed flanges
5 card sleeve threads
6-card sleeve flange
Electric contact position adjustment
M upper and lower limits
N double upper limit
P double lower limit

WSSX-411M Typical Model Example
Parameters required for selecting a bimetallic thermometer:

1. Dial diameter
2. Temperature range
3. Installation method
4. Measure insertion depth
5. On site industrial and mining facilities
6. Measurement medium

Use and maintenance of bimetallic thermometers
1. WSS series bimetallic thermometers during storage, installation, use, and transportation
In the middle, try to avoid collision with the protective tube and do not use it Bending and deformation of the protective tube. During installation, it is strictly prohibited to twist the instrument housing.
2. The instrument should operate normally within an ambient temperature range of -30 ℃ to 80 ℃.
3. The temperature at which the instrument frequently operates should ideally be between 1/2 and 3/4 of the scale range.
The temperature range of bimetallic thermometer is -80~+40 ℃ -40~+80 ℃ 0-50 ℃ 0-100 ℃ 0-120 ℃ 0-150 ℃ 0-160 ℃ 0-200 ℃ 0-250 ℃ 0-300 ℃ 0-350 ℃ 0-450 ℃ 0-500 ℃ 0-550 ℃ 0-600 ℃
Measurement range of bimetallic thermometer
[5] Temperature measurement range ℃ Adaptation range
Industrial, commercial laboratories, small-scale
-80-+40 √ √
-40-+80 √ √
0-50 √ √
0-100 √ √
0-150 √ √
0-200 √ √
0-300 √ √
0-400 √ √
0-500 √ √

identification
Bimetallic thermometers are based on the principle that two different metals expand differently when the temperature changes
Made it. The main component of industrial bimetallic thermometers is a multi-layer metal sheet composed of two or more metal sheets stacked together. To improve temperature sensitivity, metal sheets are usually made into a spiral coil shape. When the temperature of multi-layer metal sheets changes, the expansion or contraction of each layer of metal is uneven, causing the spiral coil to roll up or loosen. Due to one end of the spiral coil being fixed and the other end being connected to a freely rotatable pointer, when the bimetallic strip senses a temperature change, the pointer can indicate the temperature on a circular scale. The temperature measurement range of this instrument is 200~650 ℃, and the allowable error is about 1% of the scale's two strokes. This thermometer has a similar purpose as a rod-shaped glass liquid thermometer, but can be used under conditions that require higher mechanical strength.

working principle
Using the characteristic that the resistance of a substance changes with temperature to measure temperature. When the resistance value changes, the working instrument displays the temperature value corresponding to the resistance value.
Installation requirements
Attention should be paid to the installation of bimetallic thermometers, which is conducive to accurate temperature measurement, safe and easy maintenance, and does not affect equipment operation and production operations To meet the above requirements, the following points should be noted when selecting the installation location and insertion depth of the thermistor:
1. In order to ensure sufficient heat exchange between the measuring end of the thermistor and the measured medium, the position of the measuring point should be selected reasonably, and the installation of the thermistor near the dead corners of valves, elbows, pipelines, and equipment should be avoided as much as possible
2. Thermistors with protective sleeves suffer from heat transfer and dissipation losses. To reduce measurement errors, thermocouples and thermistors should have sufficient insertion depth:
(1) For measuring the temperature of the fluid at the center of a pipeline, the measuring end should generally be inserted into the center of the pipeline (vertically or obliquely installed) If the diameter of the tested fluid pipeline is 200 millimeters, the insertion depth of the thermistor should be selected as 100 millimeters;
(2) For temperature measurement of high temperature, high pressure, and high-speed fluids (such as main steam temperature), in order to reduce the resistance of the protective sleeve to the fluid and prevent the protective sleeve from breaking under the action of the fluid, shallow insertion of the protective tube or the use of a hot sleeve thermistor can be adopted The shallow insertion type thermal resistance protective sleeve should be inserted into the main steam pipeline at a depth of not less than 75mm; the standard insertion depth for hot sleeve thermal resistance is 100mm;
(3) If it is necessary to measure the temperature of the flue gas inside the flue, even though the diameter of the flue is 4m, the insertion depth of the thermistor is 1m
(4) When the insertion depth of the measuring element exceeds 1m, it should be installed vertically as much as possible, or support frames and protective sleeves should be added