UKAS & BSI
UKAS & BSI
Glass thermometers, or more accurately liquid-in-glass thermometers are now considered old fashioned ways to measure temperature but are still one of the most used types of temperature instruments. They are used to measure the temperature of fluid across many industries, the unique design of these devices means they have excellent stability and reliability in terms of temperature readout and do respond quickly to small changes in temperature of what they are measuring.
Liquid-in-Glass Thermometers are used extensively by meteorological and oceanographic organisations as a means for accurate temperature measurement. These instruments measure temperature when the liquid in the glass expands and contracts as temperature increases or decreases, the temperature measurement capability is therefore limited by the liquid used and normally has a maximum range of between -80 to 330 degrees.
Calibrating glass thermometers involves comparison of the thermometer reading with a highly accurate temperature reference standard, platinum resistance thermometers (PRT’s) are often use for this purpose. The glass thermometer and PRT are placed together in a temperature-controlled bath or dry block calibrator allowing comparison across a range of temperature points. A minimum of 3 in low, mid, and high range is deemed as the minimum acceptable for calibration.
Our glass thermometer calibration service takes place almost exclusively at our Durham based laboratory.