How Does a Bimetallic Thermometer Work? | Tameson
In this video, Barend talks about bimetallic thermometers. How does a bimetallic thermometer work and how to select one? Check out our bimetallic thermometer product range here ► https://tameson.com/collections/bimet...
-------------------------------------
Time codes:
00:00 - Intro
00:15 - How does a bimetallic thermometer work?
00:47 - Pros and cons of a bimetallic thermometer
01:23 - Selection criteria
02:30 - Calibration of bimetallic thermometers
03:06 - Outro
-------------------------------------
On Tameson's website, you will find clear information and tools to directly order the right products for your application. Tameson has over 90,000 products in stock, with new product types and variants added on a continual basis. Solenoid valves, ball valves, pneumatic cylinders, hoses, fittings, and more. Tameson's engineering support team and global delivery options allow for new and existing customers (B2B & B2C) to get the right products at the right cost.
VISIT OUR WEBSITE:
Global (Tameson.com) ► https://tameson.com/?utm_source=YouTu...
FOLLOW US ON SOCIAL MEDIA:
Twitter ► / supporttameson
Facebook ► / tamesonfluidcontrol
LinkedIn ► / tameson
TAMESON NEWSLETTER SUBSCRIPTION:
It is straightforward, no nonsense, and full of relevant information once a month. We have new product announcements, technical articles, special pricing, and much more that you'll have to subscribe to see!
English (Tameson.com) ► https://manage.kmail-lists.com/subscr...
-------------------------------------------
Hey, I’m Barend from Tameson, and today we’re going to talk about bimetallic thermometers. First, we’ll see how they work, why they are used in industry, how to select one, and finally why calibrating them is important.
A bimetallic thermometer uses a bimetallic strip to measure temperature. The thermometer's stem comes into contact with the fluid. Within this stem is the bimetallic strip, which is essentially two strips of different metals bonded together. As temperature changes, the metals expand or contract at different rates, causing the strip to bend. With proper calibration, the bending moves a pointer on the dial to indicate the temperature. They are fully mechanical and do not require a power source to operate. The most commonly used bimetallic strip design for industrial applications is the helix strip.
Bimetallic thermometers are common for industrial applications because they are simple, robust, and provide accurate temperature readings. They are easy to install and maintain, and ambient temperature changes don't affect the reading. They also offer a good cost-to-performance ratio.
Bimetallic thermometers are not suitable for extreme temperatures and are typically used between -70°C to 600°C. They also have a slower temperature response time compared to other industrial thermometers, such as gas expansion thermometers.
To select the right bimetallic thermometer, consider these 5 main selection criteria:
First, the temperature range. Ensure the bimetallic thermometer is rated for the temperature of your application.
Second, the stem length and orientation. Determine the immersion length, or depth, of the tank or pipe where the thermometer will be used and use this to determine the stem length. Next, decide if the stem should be orientated in the rear or under the cabinet. This ensures that once it is installed, you can easily read the dial in the cabinet.
Third, cabinet material and diameter. Ensure that the cabinet material is suitable for the environment and small enough to fit in your application, but big enough to properly read.
Fourth, know how accurate of temperature readings you need for your application and selec the appropriate accuracy class for the thermometer.
And lastly, decide if you want to use a thermowell with the bimetallic thermometer. A thermowell is used to protect the stem from the fluid and allows for easy removal of the thermometer.
Calibrating your thermometer is essential. A thermometer typically needs calibration if it's new and lacks a calibration certificate, has been in storage for an extended period, or if you suspect an inaccurate reading due to handling or dropping it. Always calibrate it to a temperature close to the process media temperature. Calibrate it manually with the ice point or boiling water method, or send it out for calibration.
-------------------------------------------
#tameson #thermometer