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%PDF-1.4 %���� A typical accuracy for a platinum resistance thermometer is +/-0.5^0C, with some designs exceeding +/-0.07^0C. 0000001593 00000 n Some digital thermometers even come with disposable tips to help with this situation. Laser thermometers advantages. Clinical and Laboratory Standards Institute. It’s the basic building block of most analytical measurements. freezing pount), Alcohol thermometer (compared to a mercury thermometer), fluid loss by evaporation hard to Temperature, and where necessary, humidity alarm systems should be linked to the monitoring system(s) with high and low alarm set points. Actually, there is considerable variation in response time. However, while there are benefits, there are also disadvantages to digital thermometers. These thermometers provide a convenient method for measuring temperature over a broad range of applications with reasonable stability and accuracy. alcohol can polymerise. However, while there are benefits, there are also disadvantages to digital thermometers. if you point an IR gun at a window, you'll be measuring the temperature of the window pane, not the outside temp). They are positive temperature coefficient (PTC) sensors whose resistance increases with temperature. Use this feature to compare various temperature sensors and match them to the analytical procedure. The laboratory instrument may have been received at the metrology laboratory and found to perform within manufacturer’s specifications, so no adjustment was needed. Compare temperature readings of this thermocouple with an independent NIST-certified digital thermometer, and you’ll probably find differences, even in different areas of the refrigerator. The “mini” environment deals with smaller controlled areas, such as incubators, refrigerators/freezers, coolers used for blood storage and transport in the O.R., biological safety hoods, pharmacy compounding sterile isolators, etc. Ensure that your NIST calibration of the device includes calibration of the total sensor-read-out system, as temperature effects on the readout device can be a subtle source of error as well. At first glance, a digital thermometer seems to be the best choice for measuring temperatures. * Temperature Range: High-temperature range compared to the alcohol thermometers is another advantage of the mercury types. Thermal gradients don’t occur in the laboratory. Etekcity Infrared Thermometer 774 (Not for Human) Temperature Gun Non-Contact Digital Laser Thermometer-58℉ to 716℉ (-50 to 380℃), Standard Size, Black by Etekcity $27.99 $ 27 . Thermocouples are used for in situ observations at locations wired to a These thermometers can also have a one or two degree difference compared to rectal or oral readings. Disadvantages and Advantages of a Digital Thermometer, BBC News Health: Ear Thermometers 'Unreliable'. Certifying organizations such as JCAHO (Joint Commission) require laboratory instrumentation to be NIST certified. However, in general, NIST does not require or recommend any set recalibration interval for measuring standards or instrumentation. Alcohol thermometer (compared to a mercury thermometer) lower freezing point (-114 ºC) less durable (alcohol evaporates) larger coefficient of expansion. Their reaction times are quick, but their long-term stability is somewhat worse and their measuring accuracy is poorer. The same bending can be seen if a strip of sticky tape is Thermocouples are used for. But what is “room temperature”? However, before you can develop confidence in their ability to give fast temperatures, you must understand their limitations.

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