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Thermistor and Water

Thermistor and Water

MEI 20/05/2018 0
An NTC thermistor is designed to measure temperature changes in different applications, but it is truly ideal for working in liquids (such as water). This is a result of long-term reliability and stability. They are the most accurate temperature gauges (when compared to a thermocouple), which allows for extremely close readings.A thermistor placed in water will most likely stay in one place for extended periods of time. A thermistor offers long-term durability for thermistor in water-based applications. A thermocouple will begin to weaken, which degrades its ability to read temperature accurately. Having to consistently replace thermocouples will intermittently stop production.A study about water temperature changes in Lake Tahoe has just recently ended. It was a 40-year study that suggests global warming is responsible for an increase in temperature in the lake (there has been a consistent rise over the last four decades). This is a big problem for the current habitat of the lake, and the warmer water threatens to destroy the whole eco-system.NTC thermistors were extensively used for this study because of their high accuracy rates. The thermistors helped to prove that the temperat...
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Basic Knowledge of Thermistor

Basic Knowledge of Thermistor

MEI 07/02/2018 0
What is a Thermistor?Thermistors (thermal resistors) are temperature dependent variable resistors. There are two types of thermistors, Positive Temperature Coefficient (PTC) and Negative Temperature Coefficient (NTC). When the temperature increases, PTC thermistor resistance will increase and NTC thermistor resistance will decrease. They exhibit the opposite response when the temperature decreases. Both types of thermistors are used in a variety of application areas. However, here the focus will be on using NTC thermistors to measure temperature in microcontroller based applications. Thermistor SpecificationsThe following NTC thermistor parameters can be found in the manufacturer's data sheet. ResistanceThis is the thermistor resistance at the temperature specified by the manufacturer, often 25°C.ToleranceIndicates how much the resistance can vary from the specified value. Usually expressed in percent (e.g. 1%, 10%, etc). For example, if the specified resistance at 25°C for a thermistor with 10% tolerance is 10,000 ohms then the measured resistance at that temperature can range from 9,000 ohms to 11000 ohms.B (or Beta) constantA value that represents the relationship between the re...
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Basic Knowledge of Thermocouple

Basic Knowledge of Thermocouple

MEI 07/02/2018 0
What is thermocouple?A thermocouple is a junction between two different metals that produces a voltage related to a temperature difference. When two wires composed of dissimilar metals are joined at both ends and one of the ends is heated, there is a continuous current which flows in the thermoelectric circuit (the thermoelectric effect or Seebeck effect).Need for reference junction( cold junction):In thermocouples, voltage is developed due to flow of electric current. This current flow depends upon the difference in temperatures at the two ends of conducting wire. That is thermocouples always measure difference in temperatures and not absolute temperature.To measure the temperature of one junction, the other junction is kept at some reference temperature. As this is done by using ice bath, it is normally called at cold junction.Using ice bath for constant temperature is useful for laboratory calibration, but is not convenient for most measurement and control applications. Instead of ice bath, an effect of  cold junction is   added using a thermally sensitive device such as a thermistor or diode. This is also called as isothermal block. Special care is taken to minimize any tempera...
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Basic Knowledge of RTD

Basic Knowledge of RTD

MEI 07/02/2018 0
What is RTDRTD stands for Resistance Temperature Detector. RTDs are sometimes referred to generally as resistance thermometers. The American Society for Testing and Materials (ASTM) has defined the term resistance thermometer as follows:Resistance thermometer, n. - a temperature-measuring device composed of a resistance thermometer element, internal connecting wires, a protective shell with or without means for mounting a connection head, or connecting wire or other fittings, or both. [Vol. 14.03, E 344 - 02 § 3.1 (2007).]An RTD is a temperature sensor which measures temperature using the principle that the resistance of a metal changes with temperature. In practice, an electrical current is transmitted through a piece of metal (the RTD element or resistor) located in proximity to the area where temperature is to be measured. The resistance value of the RTD element is then measured by an instrument. This resistance value is then correlated to temperature based upon the known resistance characteristics of the RTD element.How do RTDs Work?RTDs work on a basic correlation between metals and temperature. As the temperature of a metal increases, the metal's resistance to the flow of ele...
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4-CH RTD Data Logger Launched!

4-CH RTD Data Logger Launched!

MEI 01/01/2018 0
We are proud to announce the launch of SITE-LOG LRTDThe SITE-LOG LRTD-1/2/3 is a 4-channel, battery powered, standalone RTD data logger. The logger records the ambient temperature and four resistance temperature detectors (RTDs). Data is stored in 8MB non-volatile flash memory for later retrieval.Three models are available for all 3 or 2-wire RTD types (PT100, PT500, PT1000). Its versatile equations simplify engineering unit conversion. Plug & Play USB port makes the communication easy and Its aluminum enclosure makes it excellent in the harshest industrial environment....
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SiteView 3.3.1 Released!

SiteView 3.3.1 Released!

MEI 01/01/2018 0
We are pleased to announce that SiteView was upgraded to Version 3.3.1.SiteView is a PC based application works with Microedge data loggers for downloading, configuration, data analyzing and plotting.Its user-friendly graphic interface plus powerful functionalities fit both novice and advanced users.The versatility of custom equation and custom-line equation handle complicated measurement requirements.The new version of SiteView contains the following updates:SITE-LOG 4-Channel RTD Data Logger is supported by the new version.New firmware for PRECISE-LOG was released to improve the WIFI and USB communications. If you have any issue of communications please download SiteView and upgrade the firmware of the loggers. Detailed instructions can be found at: How can I upgrade logger firmware?Various bug fixes....
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