Advantages & Disadvantages of Mercury Thermometers Mercury thermometers are inexpensive, durable and accurate. Our own study supports the conclusion that when used correctly, both NexttempR and TraxitR compare very closely with GMT. Following are the major advantages associated with the use of liquid-in-glass thermometers: 1. Metallic mercury in its liquid state is relatively harmless when confined. It is relatively bright but not suitable for very brightly environments. liquid in glass thermometer advantages and disadvantages. http://www.theaudiopedia.com What is LIQUID CRYSTAL THERMOMETER? The GMT has been considered to be more accurate than other thermometers [1] and, since its development in 1866 by Sir Thomas Allbutt, it has been the gold standard for body temperature measurement against which other devices are judged. For GMT and Traxit the mean temperature difference was −0.05°C (−0.09°C to −0.01°C) for the doctor and 0.19°C (0.10–0.28°C) for the nurses. It consumed a lot of electricity which produce a lot of heat. The TraxitR thermometer was stuck in place in the patient's axilla following exposure of its adhesive backing. The sensitivities and positive predictive values of the FeverScanR and TempDOTR devices to correctly identify febrile children were 89% and 57% for the former and 92% and 86% for the latter. I actually thought that the … The manufacturer claims that it is easy to use, non-toxic, hygienic and low cost, requires no special storage conditions and does not need calibration. During the course of our small study over a period of 5 months, eight GMTs were known to have been broken. In spite of prompting, only 6 of the 12 nurses completed questionnaires. Infrared in Space | November 5, 2016 at 10:18 am | Reply. From the viewing angle, the color and contrast not consistent. The TraxitR thermometer is sold as a stick-on thermometer to be applied to the thoracic wall of the axilla and, according to the manufacturer, is supposed to stick on for at least 48 h. However, in this study it often fell off before 24 h. The present study is the first of its kind in Papua New Guinea. The last dot to turn black is recorded as the patient's temperature. ... because of the low boiling point of the thermometer’s liquid contents. Advantages of alcohol over mercury: (a) Freezing point of alcohol is − 1 1 7 ∘ C and hence can record very low temperature For example in Arctic and Antarctic regions temperature may fall below − 8 0 ∘ C which cannot be measured by mercury thermometer because mercury freezes at − 3 9 ∘ C (b) The expansion of alcohol per degree rise in temperature is much more around six times more then that of mercury and … Advantages and Disadvantages of Different Types of Thermometers Medically reviewed by Debra Sullivan, Ph.D., MSN, R.N., CNE, COI — Written by Corey Whelan on December 15, 2020 Types 2. LCs are reversible in that they can be used over and over again. TraxitR is designed to adhere to the patient's skin, allowing continuous monitoring of temperature [19]. A total of 200 patients participated in the study. They were initially trialed in anaesthesia [9,10], but the development of easy-to-use devices led to their more widespread use in the 1980s and 1990s. Liquid-In-Glass Thermometers . It is at least possible that those who found the LCT difficult to use may have felt embarrassed and therefore reluctant to complete it, and the results obtained are therefore not reliable. LCs start black below their temperature range, go through the colors of a rainbow, and back to black again above the temperature range. When these thermometers are placed in warm solutions, they can measure the temperature of that solution using the expansion of the liquid inside the bulb through the capillary tube. Below are some of the advantages and disadvantages associated with thermometric liquids. These instruments are, however, expensive and some studies have reported variable accuracy [3–8]. The cost of RTD is high. What is Pyrometer? None of the children had a temperature recorded by GMT that was outside the range of LCTs (35.5–40.4°C). The Liquid Crystal Display price is not high and it affordable and commonly found at most of the places. The laptop is used for showing a clearer picture of the actual color. 5. 23963. In a study from Zambia, Morley and colleagues compared two different LCT devices with GMT [14]. L. Mauta, J. Vince, P. Ripa, Comparison of the Use of Liquid Crystal Thermometers with Glass Mercury Thermometers in Febrile Children in a Children's Ward at Port Moresby General Hospital, Papua New Guinea, Journal of Tropical Pediatrics, Volume 55, Issue 6, December 2009, Pages 368–373, https://doi.org/10.1093/tropej/fmp027. They are fragile, and there is a potential danger of mercury-vapour toxicity following breakage [2], and injury to skin and mucous membranes. Thermometers are used to measure temperature and convert this into a readable format such as Celsius, Fahrenheit or Kelvin. Eight months after the start of the study, the mean difference between GMT and one of the NextempR thermometers used at the start of the study was −0.15°C (−0.002°C to −0.30°C) for 10 recordings by the same doctor. In order for a new technology to be introduced into everyday practice it is essential that it is well accepted by those using it most frequently—in this case the nursing staff. Thermister-based or “metal thermometers” are recommended in these applications, … Thermometers are primarily used in the medical, … It gives more accurate readings. This prospective study was conducted between April and August 2007 in the paediatric wards of the Port Moresby General Hospital, the only tertiary referral hospital in Papua New Guinea. TOPICS: Infrared Thermometers. These are safer than a mercury-in-glass thermometer [ citation needed ] , and may be advantageous in some patients, but do not always give an exact result, except for the analytic liquid crystal thermometer which shows the exact temperature between 35.5 to 40.5 Celsius. We compared the temperatures recorded, in febrile children admitted to a children's ward at Port Moresby General Hospital, by a doctor and by a group of nurses using glass mercury thermometers (GMT) and liquid crystal thermometers (LCT, NextempR and TraxitR). Bland Altman plots of the mean temperature differences between the NextempR and GMT and TraxitR and GMT are shown in Figs 3 and 4. GMTs are, however, not without their problems. Body temperature measurement is an integral part of patient monitoring and management. Save my name, email, and website in this browser for the next time I comment. It shows clearly that NextempR and TransitR can be used interchangeably with GMT in a Papua New Guinean hospital setting. The NextempR and TraxitR thermometers (Medical Indicators, Pennington, NJ, USA) are examples of the newer generation of LCTs and have been on the market for several years. Benefits of indoor digital thermometers - compact and cheap cost, and shortcomings - low descriptiveness and lack of functionality. We will be considering the working properties, characteristics, application and advantages/ disadvantages of the following smart and modern materials; thermo-ceramics, shape memory alloys (SMA), reactive glass, liquid crystal displays (LCD), photo-chromic materials, thermo-chromic materials, quantum tunnelling composites. LCs start black below their temperature range, go through the colors of a rainbow, and back to black again above the temperature range. Oxford University Press is a department of the University of Oxford. A clinical appraisal, Comparing liquid crystal thermometer readings and mercury thermometer readings of infants and small children in a traditional African setting. The disadvantages includes, it is fragile and the fluid contained inside the tube may be toxic. Following are the major advantages associated with the use of liquid-in-glass thermometers: They are comparatively cheaper than other temperature … The full and inter-quartile ranges of the doctor's measurements are smaller than those of the nurses, and there are several outliers in the nurses’ recordings. The liquid crystal thermometer allows measuring the temperature of a solid object surface, and the human body, without providing a corresponding electrical signal, making use of special material ... and expensive price. However, they present many safety and environmental hazards. The 50 dots represent temperature increments of 0.1°C over the range 35.5–40.4°C. The age of the participants ranged between <1 and 13 years of age with a median age of 2 years and an inter-quartile range of 1–3 years. ... January 10, 2021 In Uncategorized By. Advantages . Liquid in glass thermometers are fragile and for industrial use, the thermometer is mounted in a protective housing and the scale is engraved on a separate plate that is part of the protective case. They are handy and convenient to use. Boxplot of temperature difference between GMT and Traxit. ALSO READ. Those that did answer, however, were favourably impressed. Alcohol thermometer and mercury thermometer are two types of thermometers that are composed of a bulb filled with a liquid and a capillary tube connected to the bulb. Box plots of the temperature differences between GMT and NextempR and GMT and TraxitR are shown in Figs 1 and 2. Posted By: davisblog_admin March 24, 2014. Pyrometer also is known as an Infrared thermometer or Radiation thermometer or non-contact thermometer used to detect the temperature of an object’s surface … We conclude that the LCT such as NextempR and TraxitR devices can have a significant place in Hospital and clinic practice in resource-poor environments. Below are some of the advantages and disadvantages associated with thermometric liquids.Advantages of mercury as a thermometric liquid.-It is a good conductor of heat and therefore the whole liquid reaches the temperature of the surroundings quickly.-It does not wet (cling to the sides of) the tube.-It has a high boiling point -It expands uniformly (linear expansion) and responds quickly to temperature … Of the studied population 58% (116) were male and 42% (84) were female. The mixture in each dot is formulated to melt and change colour from green to black at a specific temperature. measured and recorded the temperature of each of 100 children using GMT, NextempR and TraxitR simultaneously. LCTs, which depend on the change in colour of liquid crystals with temperature change, have been available in various forms since the early 1970s. Please check for further notifications by email. The mean differences were 0.004°C (−0.043°C to 0.050°C) and −0.069°C (−0.121°C to −0.017°C). Digital Thermometer - a small indoor unit with liquid crystal display, which displays information about the room temperature and beyond. The mean difference (with 95% confidence intervals) in temperatures between GMT and NextempR were −0.12°C (−0.16°C to −0.08°C) for the doctor and 0.12°C (0.04–0.20°C) for nurses. Alcohol (also called spirit-filled) thermometers are inexpensive but they also break very easily. The big advantage of the GMT is that it is cheap, and it is still the most widely used form of thermometer in many parts of the world. 1 Answers. Unlike electrical thermometers, they do not necessitate power supply or batteries for charging. The GMT and NextempR were placed in the axilla and left in place for 2–3 min before a reading was taken. Thermometers without sensors are used only for measuring the room temperature. Relatively few studies have assessed their use to detect febrile children in such situations. Liquid Crystal Thermometers. Following instruction in the use of the new LCTs, a group of twelve nurses also took the three temperature readings from each of a further 100 patients. Advantages and disadvantages of bipolar junction transistor (BJT). For full access to this pdf, sign in to an existing account, or purchase an annual subscription. The first author (L.M.) They provide very good repeatability and their calibration remains unaffected. Your comment will be reviewed and published at the journal's discretion. The picture shows an example of a liquid … Alcohol Thermometers can leak easily and wet the wall, leading less accurate and slow readings. The sensors convert the temperature into numeric value, ie, numbers that are marked on the side of the mercury or just digital representation of the numbers. The results of our study showed that the differences recorded by the single doctor were more closely aligned to the GMT readings that were those of the nurses. ... Hey, Thank you for sharing your expertise on Infrared Thermometer. Search for other works by this author on: Evaluation of clinical thermometers for accuracy and reliability, Acute mercury vapour poisoning in an infant, Unreliability of the infrared tympanic thermometer in clinical practice: a comparative study with oral mercury and oral electronic thermometers, Lack of agreement between tympanic and oral temperature measurement in adult hospitalized patients, A difference of 5 degrees Celcius between ear and rectal temperatures in a febrile patient, Screening for fever in an adult emergency department: oral vs tympanic thermometry, Use of tympanic thermometers to screen for fever in patients in a paediatric emergency department, Reliability of infrared tympanic thermometry in the detection of rectal fever in children, Continuous monitoring of skin temperature using a liquid crystal thermometer during anaesthesia, An evaluation of liquid-crystal thermometry as a screening device for interoperative hyperthermia, Comparison of disposable and glass mercury thermometers, Comparison of standard mercury thermometer and the liquid crystal device skin contact thermometer in febrile children at Eldoret District Hospital, An evaluation of body temperature measurement, The relative accuracy of mercury Tempa-DOT, Liquid crystal forehead temperature strips. Your email address will not be published. They are unable to read temperatures <35.5°C and >40.4°C. They can be frequently applied in areas where there is problem of electricity. In Kenya, Esamai [12] showed that in 14 of a sample of 56 children there was no temperature reading difference between the GMT and LCT, in 12 the chemical dot thermometers recorded higher readings than the GMT by an average of 0.34°C and in 30 children the GMT recorded higher readings than the LCT by an average of 0.67°C. And there is problem of electricity s directions temperature, and the dots arranged. You get what you pay for compact and cheap cost, and website in this browser the... Each less than 1 mm in diameter, arranged in rows of five flexible polystyrene plastic strip, 9.1 long... Of the low boiling point of the studied population 58 % ( 116 ) were and! 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