How do you test the functionality of a standard temperature sensor?
Release Date:
2023-03-28
Author:
A temperature sensor is essentially a negative temperature coefficient thermistor: as temperature rises, its resistance decreases. When evaluating the performance of a temperature sensor, first verify that its resistance varies with temperature, and then confirm that the measured resistance falls within the specified tolerance range.
The quality of a temperature sensor is assessed using the sensing-element method. When evaluating a sensor, only two aspects are typically considered. 1. It works. 2. It’s easy to use.
For a temperature sensor, “usable” means it functions when powered on. “Effective” means its accuracy and response time meet the specified requirements. Therefore, whether the sensor outputs resistance, current, or voltage, it must first be powered up and tested to verify that an output signal is present. If an output is observed upon energization, the sensor can be considered functional. Next, use a reference standard to assess accuracy by comparing the measured temperature values against the nominal range. Finally, evaluate the sensor’s response speed by examining the delay time in its temperature‑response curve. t0.9 is considered to meet the specifications as long as it is less than 30 seconds.
There are four methods for determining whether a temperature sensor is functioning properly:
1. If a meter is available, connect the sensor to it, place the sensor in an ice‑water mixture, and observe whether the meter displays correctly. At 0 degrees Celsius, does the reading change?
2. If no thermometer is available, consider the sensor’s temperature‑measurement range and explore the use of a three‑wire platinum resistance thermometer.
3. Place the sensor in an ice–water mixture and measure its resistance with a multimeter; platinum resistance thermometers typically have only a few standard values. PT100, PT1000, and PT200 have resistance values of 100 ohms, 1000 ohms, and 200 ohms, respectively, when immersed in an ice–water mixture.
4. With the sensor held in hand, the reading varies accordingly, and the magnitude of the variation remains consistent.
Method for Using a Multimeter to Test the Functionality of a Temperature Sensor
If it’s several tens of thousands of euros… Or if the resistance is close to 0 ohms (e.g., below 0.1 Ω), it’s definitely faulty... Alternatively, you can fill a paper cup with hot water, place the sensor inside, and use a multimeter to measure its resistance to see if it changes. If the resistance varies smoothly and stays within the normal range—around several hundred to a few thousand ohms (–40°C: 450 kΩ; 20°C: 2.5 kΩ; 130°C: 100 Ω)—then the sensor is functioning properly.
Huizhou Jin Yuan Xiang Electronic Co., Ltd. It is a high-tech enterprise that manufactures NTC thermistor NTC temperature sensor Temperature probe. Feel free to request a quote with product images. Free sample production available. For more information on NTC thermistors, please visit our website at www.jyx-sensor.cn. If you have any questions, please contact our team for assistance.
Previous Page: What are the common types of temperature sensors?
Next page: NTC temperature sensor compatible with high-speed blenders
Latest Updates
What types of temperature sensors are there?
2023-05-22
Contact Us
+86-137 9451 4154(Miss Jiang)
Add: Room 01, 8th Floor, 3rd Building, Daya Bay KeChuang Huizhou Software Park, No. 28, Longshan 2nd Road, Daya Bay West District, Huizhou, China
Wechat / Whatsapp / Telegram:
Scan with WeChat
Power by:www.300.cn
