Yesterday afternoon, a customer from Nantong needed to purchase a temperature measuring instrument. The temperature was 500 ℃. We asked him which type of temperature instrument he wanted, and he said that as long as it could measure a temperature of 500 ℃, it would be fine. Then he asked us: Should we choose a thermistor or a bimetallic thermometer for industrial temperature measurement below 500 ℃? We asked him if he wanted to bring remote transmission or display the temperature value locally, whether the installation method was threaded or flange, what diameter of the rod was needed, what medium was measured, and what material was needed to make it? Afterwards, the customer went to the site to take photos and sent them to us. After recommending to the customer, we finally chose a thermistor, and the customer was very satisfied.

Today we will talk to you about whether to choose a thermistor or a bimetallic thermometer for industrial temperature measurement below 500 ℃?

The selection of thermistor and bimetallic thermometer for industrial temperature measurement below 500 ℃ needs to be determined based on the temperature measurement requirements. The comparison and recommendations between the two are as follows:

1、 Should I choose a thermistor or a bimetallic thermometer for industrial temperature measurement below 500 ℃? Observing the Temperature Measurement Principles and Accuracy of Thermistors and Bimetallic Thermometers

Thermistor: It uses the characteristic of the resistance value of metals (such as platinum and copper) changing with temperature to measure temperature, with high accuracy (usually ± 0.1 ℃~± 1 ℃), suitable for scenarios that require precise data (such as laboratory and industrial control).

Bimetallic thermometer: It measures temperature by measuring the bending degree of two metal sheets with different expansion coefficients, with low accuracy (usually ± 1 ℃~± 2.5 ℃), suitable for scenarios with low accuracy requirements (such as equipment surface temperature monitoring).

2、 Should I choose a thermistor or a bimetallic thermometer for industrial temperature measurement below 500 ℃? Adaptability of temperature measurement range between thermistor and bimetallic thermometer

Thermistor: The commonly used platinum resistance (Pt100) has a temperature measurement range of -200 ℃~850 ℃, can work stably below 500 ℃, and has better low-temperature performance (such as being reliable below -50 ℃).

Bimetallic thermometer: The common temperature range is -50 ℃~500 ℃, but at high temperatures (such as close to 500 ℃), the accuracy of the metal sheet may be affected by long-term thermal fatigue, making it suitable for medium and low temperature ranges (such as 0 ℃~300 ℃).

3、 Should I choose a thermistor or a bimetallic thermometer for industrial temperature measurement below 500 ℃? Check the installation and usage scenarios of thermistor and bimetallic thermometer

Thermistor: It needs to be used in conjunction with secondary instruments (such as temperature transmitters, PLCs), with complex wiring, and is suitable for fixed installation in pipelines, equipment interiors, and other scenarios that require remote monitoring.

Bimetallic thermometer: The mechanical meter head directly displays temperature, with simple installation (threaded or flange connection), suitable for on-site display (such as reaction kettle, steam pipeline surface), and does not require power supply.

4、 Should I choose a thermistor or a bimetallic thermometer for industrial temperature measurement below 500 ℃? Check the resistance to interference and durability of thermistor and bimetallic thermometer

Thermistor: susceptible to electromagnetic interference, requires shielded wires to transmit signals, and high environmental vibrations may affect wiring stability.

Bimetallic thermometer: The mechanical structure has strong anti vibration ability, is resistant to environmental interference (such as dust and moisture), and has low maintenance costs.

Above: Should we choose a thermistor or a bimetallic thermometer for industrial temperature measurement below 500 ℃?

Scenarios for selecting thermal resistors:

1. High precision temperature measurement is required (such as chemical reaction temperature control, food processing sterilization temperature monitoring).

2. Remote data transmission or access to automated control systems is required.

3. The temperature fluctuation in the temperature measurement environment is large, and long-term stable measurement is required (such as cold storage, constant temperature box).

Scenario for selecting a bimetallic thermometer:

1. Only on-site visual readings are required, with low precision requirements (such as air conditioning ducts and heating equipment).

2. The installation location has high vibration and harsh environment (such as near industrial kilns), requiring wear-resistant mechanical instruments.

3. A simple scenario with limited budget and no need for complex signal processing.