high elastic demand 5.2.7 Other types of contact sensors
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blind puntstuk dn 50 din 11851 Other type of thermometers used are:
- Indicator strips (moving line, Tempadot)
- Liquid expansion (Mercury thermometer, Alcohol thermometer)
- Dial thermometers (Bimetallic strip thermometer, Bourdon gauge thermometer)
- FBG temperature sensors
taxi online international These sensors are mostly used for body temperature of fluid temperature measurement and are discussed in more detail in the section below.
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lieverd is jarig A plastic strip impregnated with heat-sensitive chemical dots, which, when exposed to an increase in temperature, melt, resulting in a change of colour. They provide a faster reaction time than mercury, taking 1 minute for an oral reading and 3 minutes for an axillary reading. Tempadots are disposable and have the advantage that they reduce the risk of cross-infection.
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A mercury-in-glass thermometer is effective in the range -39°C to ~250°C. If a thermometer is required for lower temperatures, the alcohol-in-glass thermometer (utilising the same principle) can be used in the range -117°C to 78°C.
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- No power supply needed
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- Slow response time
- Easily broken
- Mercury toxicity
- Risk of cross-infection (Salmonella and Clostridium)
- Withdrawn from NHS use
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captain kangaroo character The Alcohol thermometer or spirit thermometer is an alternative to the mercury-in-glass thermometer, and functions in a similar way. But unlike mercury-in-glass thermometer, the contents of an alcohol thermometer are less toxic and will evaporate away fairly quickly.
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benimar enkele bedden Two dissimilar metals (different coefficients of expansion) fixed together in a coil. Differing expansion in each metal causes the coil to wind/unwind, as the temperature changes. This causes a pointer to move across a dial.
beste survival messen The Bimetallic strip is a mechanical temperature sensor element. It converts temperature to a mechanical displacement. This displacement may be coupled to a switch for simple on-off function, to a needle of an indicator or to a position detector for electronic output.
laat uw gezicht spreken By far the most common application of the bimetallic strip is as a thermostat switch used for temperature and energy control.
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This is a hollow spiral metal tube, based on the Bourdon pressure gauge. The tube terminates at one end in a temperature-sensing bulb containing a volatile liquid or vapour. This expands as the temperature rises, causing the tube to unwind, which in turn moves a pointer.
- Easily read
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- Poor accuracy
- Prone to calibration errors
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date paste density The expansion of the fibre causes the pattern to expand an cause a wavelength shift of the reflected light. This wavelength shift can be detected with high accuracy. This way many sensors can be made with this principle. A bare FBG is already a temperature sensor, because the thermal expansion of the glass fibre. The sensitivity of the sensor can be enhanced by coating the FBG with a higher expansion material.
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