Industrial Analog Thermometers

Introducing our industrial thermometer – a reliable and cost-effective solution for temperature measurement in various industrial applications.  This thermometer offers accurate readings with a simple, easy-to-read analog display and a durable construction that ensures long-lasting performance.  With a wide temperature range, it is suitable for use in manufacturing, petrochemicals, food processing, and other industries.

Whether monitoring temperatures in ovens, reactors, or HVAC systems, our industrial thermometer delivers the precision and reliability you need for efficient and safe operations.  Upgrade your temperature measurement capabilities with our trusted industrial thermometer.

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Description

Industrial Thermometers

Industrial Analog Thermometers are devices used to measure temperature in various industrial applications. Also, they play a crucial role in ensuring efficient and safe operations across a wide range of industries, including manufacturing, petrochemical, pharmaceutical, and food processing, among others.

Industrial Analog Thermometers come in different forms, each designed to suit specific environments and temperature ranges.  Moreover, the most commonly used types include glass thermometers, bimetallic thermometers, filled system thermometers, and digital thermometers.  Let’s discuss each of these in more detail.

Glass thermometers are the oldest and simplest type.  Furthermore, they consist of a glass tube filled with a liquid, usually mercury or alcohol.  In addition, the liquid expands or contracts with changes in temperature, causing a meniscus movement that indicates the temperature on a calibrated scale.  Finally, Glass thermometers are inexpensive and widely used, but they have limitations in terms of their fragility and limited temperature range.

Bimetallic thermometers, on the other hand, use the principle of differential expansion of two metals to measure temperature.  In addition to this, they consist of two metal strips bonded together, with different coefficients of thermal expansion.  Finally, as the temperature changes, the strips bend, causing a pointer to move along a calibrated scale.  Bimetallic thermometers are durable and can handle a wider temperature range than glass thermometers.

Filled system thermometers utilize a temperature-sensitive fluid, such as a gas or liquid, enclosed in a bulb or capillary tube.  As the temperature changes, the fluid expands or contracts, causing a corresponding movement of a pointer or display.  Filled system thermometers offer greater accuracy, flexibility, and reliability over a wide temperature range.

Different Types

In addition to the different types, Industrial Analog thermometers also vary in terms of their mounting and connection options.  Some can be mounted directly onto an industrial process or equipment, while others require a thermowell, a protective housing that allows temperature measurement without direct contact with the medium.  Apart from this, thermowells come in various designs to accommodate different process conditions, such as pressure, flow, and corrosive environments.

To ensure accurate measurements, industrial thermometers undergo calibration and periodic recalibration.  Calibration involves comparing the thermometer’s readings against a known reference under controlled conditions.  Recalibration is necessary to account for any shifts or drifts in the thermometer’s accuracy over time.

Essential

In conclusion, industrial thermometers are essential tools for monitoring temperature in various industrial settings.  They provide critical information for maintaining process control, optimizing efficiency, and ensuring the safety of personnel and equipment.

Analog industrial thermometers, such as glass thermometers and bimetallic thermometers, have been widely used for temperature measurement in industries.  They come with certain advantages and disadvantages that are worth considering. Let’s explore them:

Other Specifications

These Industrial thermometers have an adjustable angle connection that makes them ideal for placement in hard-to-reach locations.

A large 5″ face makes them more readable from a distance.  The calibration dial on the back of the thermometer makes sure you get an accurate reading.

Calibration of Industrial Thermometers

Thermometers can be calibrated either by comparing them with other calibrated thermometers.  You can also check them against known fixed points on the temperature scale.

The best-known of these fixed points are the melting and boiling points of pure water. (Note that the boiling point of water varies with pressure, so this must be controlled.)

The traditional way of putting a scale on a liquid-in-glass or liquid-in-metal thermometer was in three stages:

  1. Immerse the sensing portion in a stirred mixture of pure ice and water at atmospheric pressure.  After,  mark the point indicated when it had come to thermal equilibrium.
  2. Immerse the sensing portion in a steam bath at Standard atmospheric pressure and again mark the point indicated.
  3. Divide the distance between these marks into equal portions according to the temperature scale being used.

Other fixed points used in the past are the body temperature (of a healthy adult male) which was originally used by Fahrenheit as his upper fixed point (96 °F (36 °C) to be a number divisible by 12) and the lowest temperature given by a mixture of salt and ice, which was originally the definition of 0 °F (−18 °C).  (This is an example of a Frigorific mixture).  As body temperature varies, the Fahrenheit scale was later changed.  Finally, It was changed to use an upper fixed point of boiling water at 212 °F (100 °C).

History of Industrial Thermometers

These have now been replaced by the defining points in the International Temperature Scale of 1990, though in practice the melting point of water is more commonly used than its triple point, the latter being more difficult to manage and thus restricted to critical standard measurement.  Nowadays manufacturers will often use a thermostat bath or solid block where the temperature is held constant relative to a calibrated thermometer.

Other thermometers to be calibrated are put into the same bath or block and allowed to come to equilibrium, then the scale is marked, or any deviation from the instrument scale is recorded.  For many modern devices, calibration will be stating some value to be used in processing an electronic signal to convert it to a temperature.

Precision, accuracy, and reproducibility

The precision or resolution of a thermometer is simply to what fraction of a degree it is possible to make a reading.  For high-temperature work, it may only be possible to measure to the nearest 10 °C or more.  Clinical thermometers and many electronic thermometers are usually readable to 0.1 °C.

Special instruments can give readings to one-thousandth of a degree.   However, this precision does not mean the reading is true or accurate, it only means that very small changes can be observed.

A thermometer calibrated to a known fixed point is accurate (i.e. gives a true reading) at that point. Most thermometers are originally calibrated to a constant-volume gas thermometer.  In between fixed calibration points, interpolation is used, usually linear.

Significant Differences Between Industrial Thermometers

This may give significant differences between different types of thermometers at points far away from the fixed points.  For example, the expansion of mercury in a glass thermometer is slightly different from the change in resistance of a platinum resistance thermometer, so these two will disagree slightly at around 50 °C.  There may be other causes due to imperfections in the instrument, e.g. in a liquid-in-glass thermometer if the capillary tube varies in diameter.

For many purposes reproducibility is important.  That is, the same Industrial thermometers give the same reading for the same temperature.  Reproducible temperature measurement means that comparisons are valid in scientific experiments and industrial processes are consistent.  Thus, if the same type of Industrial thermometer is calibrated in the same way its readings will be valid.  It will remain valid even if it is slightly inaccurate compared to the absolute scale.

An example of a reference Industrial thermometer used to check others to industrial standards would be a platinum resistance thermometer with a digital display to 0.1 °C (its precision) which has been calibrated at 5 points against national standards (−18, 0, 40, 70, 100 °C) and which is certified to an accuracy of ±0.2 °C.

According to British Standards, correctly calibrated, used, and maintained liquid-in-glass Industrial Analog Thermometers can achieve a measurement uncertainty of ±0.01 °C in the range of 0 to 100 °C, and a larger uncertainty outside this range: ±0.05 °C up to 200 or down to −40 °C, ±0.2 °C up to 450 or down to −80 °C.

If this does not meet your application requirements pls contact SRS or choose another product below

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