What is an infrared thermometer?
Infrared thermometers are thermometers that measure infrared light radiating from the surface of an object. Infrared signals can be correlated to specific temperatures, which is how they can obtain a temperature reading without direct contact to the object being read. Infrared thermometers can be useful when it is not possible to obtain direct contact with the object being measured, due to it being in a controlled atmosphere, moving very fast, or when contact would contaminate the object. It is important to remember that infrared thermometers are not able to provide the accuracy that is often required, especially for food or water temperature testing. This is because an infrared thermometer measures the surface temperature only, and because there is no contact with the object measured, it will often not even measure the surface temperature of an object, but instead, measure the temperature of the air in front of the object. The fundamental accuracy typically achievable in laboratory conditions is ±2°C, in real life situations however this is rarely achieved. As a rule of thumb the colder the temperature the less accurate an infra red measurement is.
What is a thermocouple thermometer?
Thermocouple thermometers are the most widely used thermometer in the modern day. Thermocouples use electrical technology to show temperature. A thermocouple ‘couples’ together two different metals, one that is contained within the thermocouple thermometer, and one that forms a probe or sensor, to test the temperature of a substance or atmosphere. The difference in the temperatures of the two metals is expressed electrically through their different voltages. The temperature of the metal inside the thermocouple is already known, so the difference between the two temperatures allows us to easily deduce the temperature of the metal attached to the probe. The deduction is carried out using a microchip inside of the thermometer, and the temperature that the probe has sensed then shows on the display. Thermocouples are essential in many heating, manufacturing and electrical engineering applications, and can be found in different thermocouple types, according to the different metals used in the probes. Thermocouples have the advantage of a very fast response and large potential measurement range – from -270 to 1,800°C. TME thermocouple thermometers are compatible with several different thermocouple types (such as K/T/J/R/N/E/S). Most TME probes are in T type (for food applications) or K type (for non-food application), although we do manufacture probes in all different thermocouple types. In Summary ( Type T Thermocouple) Temperature range : Good Accuracy : Good Time Response : Good
What is a PT100 Thermometer?
What is a thermistor thermometer?
A thermistor thermometer measures electrical resistance proportional to temperature. The name ‘thermistor’ comes from a combination of the words ‘resistor’ and ‘thermal’. PTC thermistors, which are the kind of thermistor that TME supplies, stands for Positive Temperature Coefficient of Resistance. PTC thermistors have resistances that vary in line with their temperature, so when the temperature increases, so does the resistance. PTCs are constructed using semiconductors that are combined with ceramics or polymers. Thermistors are most commonly found for medical temperature applications, as well as within cars, computers, home appliances and more, as they provide protection against circuits overheating. Thermistors are very stable, long lasting, and more accurate than thermocouple thermometers. However they cannot be used at extreme temperatures, and generally can only measure between 0 and 100°C, which makes them less desirable for food manufacture or catering use. In Summary: Temperature range : Poor - Accuracy : Good - Time Response : Poor