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Why Your Thermometers Fail

have one job: to provide accurate temperature readings. This is very important, especially for industries where incorrect temperature readings could endanger other people.

There are many different kinds of thermometers.

Here at DirectMaterial.com we carry a variety of thermometers including bi-metal thermometers and glass industrial thermometersThe DuraChoice models have dial sizes in 3” or 5”, with stems ranging from 2 ½” to 9”.

Thermometers are used in industries such as the food industrybeer brewingrefrigerationA/Cprocessing, and many others.

Today, we will look at why your thermometers fail and how you can protect them.

Although there are many different kinds of thermometers, there are a few specific factors that can harm them.


Thermometers can be broken or affected by vibration and extreme ambient temperatures.

Both of these can alter the dial reading. In general, you should avoid putting thermometers in areas where these two factors are significant.

However, sometimes in industrial settings these things can't be avoided.

You can resist the damage from these factors by using a dampening liquid or employing a remote reading filled thermometer.


Corrosion is another enemy to thermometer happiness and productivity.

One way to fight corrosion is to use a thermowell.

Essentially a thermowell is a permanent, protective “skin” that thermometers can be placed in before the process begins.

The thermowell transfers the heat or cold from the medium being tested via a hollow tube which the thermometer fits into. The tube is closed at one end and the temperature testing equipment is inserted and removed from the other.

We offer thermowells in Stainless Steel 304Stainless Steel 316, as well as heavy duty Stainless Steel 316 models.

Sometimes, a thermometer is not broken but it is giving inaccurate readings. Because this is the case, it is a good idea to inspect and test your thermometers regularly.

The frequency of testing will be determined by what kind of thermometer you are using and where and how you are using it.

Oftentimes if your thermometer is giving you incorrect readings you can just re-calibrate the thermometer.

However, it should be noted that liquid in glass thermometers should be calibrated by a professional.

For other thermometers, such as bi-metal thermometers, you can re-calibrate them by comparison boiling and freezing (as mentioned in the article linked to above) or if you don’t feel comfortable with that you can still have a professional from a thermometer calibration service handle it.


It is important to know what causes your thermometers to fail so that you can take steps to guard against those things.

For any questions be sure to reach out to us as our contact information is listed below.

Visit our store to learn more about the variety of thermometers we offer.