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Temperature Measuring

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In 2009 the UK Health Protection Agency announced that the traditional mercury thermometer could no longer be sold to the general public because of the danger mercury presents to the environment and public health. Our Analogue Wall Thermometer is mercury free and offers a low cost solution to temperature measuring.

Our Probe Thermometers also offer a low cost solution to temperature measurement. Fixed and wired probe thermometers are ideal for food, liquid and semi-solid sampling. Pen-type thermometers are an ideal low cost solution for the most simple requirements, our range expands to include folding probes ideal for safe and compact storage. If ease of use is essential then our Min/Max Memory Alarm Thermometer is ideal, offering the flexibility of a 1 metre cable ensuring live readings can be obtained in impractical locations.

Ideal for non contact applications our Infrared Thermometers are equipped with optics that measure radiated heat. All objects have the ability to absorb and emit radiated heat but at differing values. There are two important factors that can drastically affect the accuracy of a measured value.

Spot Size: Infrared Thermometers measure the temperature of a flat surface area. The spot size is the ratio based on the distance from the thermometer to the object being measured. The nearer the object, the smaller the area of measurement. When an infrared thermometer is equipped with a laser, the laser dot indicates the centre point of the area being measured, not the focal point of measurement. Measurements should be made as near to the object as possible. The thermometer can measure at reasonable distances but the accuracy of the reading can be affected by external sources such as dust, smoke, steam and light. It has to be considered that when taking measurements from a distance the surface spot size could include surface areas not intended to be measured.

Emissivity: Emissivity is a term based on an objects ability to emit radiated heat. The scale is from 0.1 to 1.00 and takes in to account the colour, the surface finish and reflective nature of the object to be measured. 0.1 is the emissivity value associated to very shiny objects such as steel. 1.00 is the value associated with matt black. Some infrared thermometers feature adjustable emissivity, but it is very difficult for a user to accurately determine the correct value, taking into consideration the whole colour spectrum and taking in to account the reflective nature of the intended object to be measured. The error in the accuracy of a measured value can be as much as 30% of the reading just based on the emissivity. A simple way to overcome this is to paint a small area on the object to be measured matt black or paint a piece of masking tape matt black and stick it to the surface of the object to be measured. It's not the thickness of the paint but it has to be solid in colour.