1、 Instrument Overview:
Hot sleeve bimetallic thermometer is a field detection instrument suitable for measuring medium and low temperatures, which can be used to directly measure the temperature of gases, liquids, and vapors. This thermometer has the characteristics of being waterproof, corrosion-resistant, explosion-proof, vibration resistant, intuitive, easy to read, sturdy and durable in terms of design principles and structure. Measurement instruments that can replace other forms of work.
2、 Measurement principle:
It works by utilizing the principle that two different metals have different degrees of expansion 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 the temperature sensitivity of bimetallic thermometers, the metal sheet is 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 varies, causing the spiral coil to roll up or loosen. As one end of the spiral coil is fixed and the other end is connected to a freely rotating pointer, when the bimetallic sheet feels a temperature change, the pointer can indicate the temperature on a circular scale.
3、 Applicable occasions:
Can be matched with various installation sleeves to meet different pressure level requirements. It can directly measure the temperature of liquid, steam, gas media, and solid surfaces within the range of -80-+500 ℃ in various production processes.
4、 Performance characteristics:
1. On site temperature display, intuitive and convenient, safe and reliable, with long service life and other characteristics.
2. No harm, easy to read, sturdy and shock resistant.
3. The protective pipes are made of 1Gr18Ni9Ti stainless steel and molybdenum titanium, with strong pressure resistance and corrosion resistance.
4. The core type thermometer can be maintained or replaced for a short period of time without stopping the machine.
5、 Technical indicators:
Execution standards
JB/T8803-1998 GB3836-83。
Other parameters
Scale plate 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 error: The return error of the bimetallic thermometer should not exceed the * value of the basic error limit;
Repeatability: The repeatability limit range of bimetallic thermometers should not exceed 1/2 of the basic error limit * value.
6、 Precautions
1. Cannot directly twist the meter head;
2. Choose a standard size that is close in length (integer multiples of 50mm);
3. The length of the protective tube immersed in the measured medium must be greater than the length of the temperature sensing element. Generally, the immersion length is recommended to be greater than 100mm, and the immersion length for the 0-50 ℃ range is recommended to be greater than 150mm to ensure measurement accuracy.
4. Bimetal thermometers are not suitable for measuring the temperature of the medium inside open containers.
5. During storage, use, installation, and transportation, collision with protective tubes should be avoided, and the protective tubes should not be bent or deformed, let alone used as wrenches.
6. Regular inspection should be conducted under normal use. It is generally advisable to do so every six months.
7. It is not allowed to work in strong vibration environments to avoid affecting the lifespan of bimetallic devices. Electrical contact bimetallic thermometers are not allowed to be used in control circuits with high vibration to avoid affecting reliability.
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