Thermocouple Temperature
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Thermocouples are widely used in the science and industry. Thermocouples are one of the easiest temperature sensors. This equipment was developed on the basis of Seebeck effect which occurs in electrical conductors that experience a temperature gradient along their length. Thermocouples are simple to use, need no batteries and can measure over very wide temperature ranges.
In 1821, the German–Estonian physicist Thomas Johann Seebeck discovered that when any conductor is a small cuticle (like a metal) is subjected to a thermal gradient, it will generate a voltage. This is now known as the thermoelectric effect or Seebeck effect. Any attempt to measure this voltage necessarily involves connecting another conductor to the "hot" end. This additional conductor will then also experience the temperature gradient, and develop a voltage of its own which will oppose the original. Luckily, the magnitude of the effect depends on the metal in use. Using a dissimilar metal to complete the circuit creates a circuit in which the two legs generate different voltages, leaving a small difference in voltage available for measurement. That difference increases with temperature, and can typically be between 1 and 70 microvolts per degree Celsius for the modern range of available metal combinations. Certain combinations have become popular as industry standards, driven by cost, availability, convenience, melting point, chemical properties, stability, and output. This coupling of two metals gives birth to the name thermocouple.
Thermocouples measure their own temperature. The user must conclude the temperature of the object of interest by being certain there is no heat flow between them when the measurement is taken.
Thermocouples can make mistakes in reading their own temperature, especially when the system is being used for a while, or if the insulation between the wires loses its resistance due to moisture or thermal conditions, or any chemical, nuclear radiation or mechanical effects with the immediate surroundings.
Be careful of the electrical hazards when using thermocouples. Not only they are electrical conductors but also are refractory oxide sheathed models at high temperatures; if they get into contact to another source of electricity, it could electrocute the person to death.
If you want to use thermocouples, you need to have some way to interpret their small and non-linear output voltages. There are lots of ways to do it, the simplest being a measurement of the output voltage and looking up the value in a table of millivolts dc versus temperature and correcting for the cooler junction not being at 0 °C, or 32°F.
The high end is to hook the thermocouples up to a modern readout display or a DAQ module plugged into a PC and read. However, there are many subtle things about thermocouples and their uses that have made well-intentioned engineers, who thought they understood them, look like fools. The hooking up and reading out are the easy parts of a measurement.
The selection, installation details and the conditions of use play a big role in gaining a measurement that is accurate and reliable. It's like many measurement subjects, the devil is in the details and "simple" thermocouples have a lot of details!
About the Author:
Author: Carlo Di Paola is an engineer in an industry serving for the last ten years. He knows the handling and the hazards of engineering equipment like thermocouples, sensors etc. He has been assigned as an additional duty of briefing the interns and fresh personnel on the proper handling of the equipment.
Article Source: ArticlesBase.com - Thermocouple Nordicsensors Nsi
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Taylor Digital Instant-Read Pocket Thermometer $5.45 Most professional chefs have a thermometer tucked in a jacket pocket, and if it works for them, perhaps you should try it too!... |
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Taylor Professional 9306 Dual Temp IR/Thermocouple Thermometer $81.45 Taylor precision waterproof dual temp thermocouple / thermometer the infrared temperature range is -67° to 626° f(-55° to 330° c) with one second response time. the thermocouple temperature range is -67° to 572° f(-55° to 250° c) with one second response time. model #: 9306 accurate to +/-1° f waterproof haccp check warning light system 4" fold out probe step down probe carrying case and ... |
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RediCheck Remote Cooking Thermometer w/Taste Settings $29.00 Description:The Maverick RediCheck Remote features a transmitter that reads the internal food temperature with a digital electronic food probe, then sends that information wirelessly up to 100 feet away, freeing you from standing next to the oven or grill during the cooking period. When the desired temperature is reached an alarm goes off. Place the transmitter near the oven or grill. Insert the t... |
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Johnson Controls Digital Thermostat Control Unit $68.00 Convert any freezer into a kegerator! Just plug the freezer into the outlet cord, place the gas-filled sensor in the area to be controlled and program the temperature. This manual thermostat simply turns off the freezer when it reaches the specified temperature. Other features include a lockable touchpad temperature adjustment, a 6-foot power cord and a 6-foot outlet cord.... |
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Extech MN35 Digital Mini MultiMeter $19.99 * Resistance Tests with Continuity and Diode Functions * Convenient Mini Size with Protective Rubber Holster and Tilt Stand * Data Hold Locks Reading in the Display... |
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Honeywell CG511A1000 Medium Thermostat Guard with Inner Shelf to Prevent Tampering $7.53 Ultra clear chemical and UV resistant acrylic resin cover and base resist yellowing. Secure, tumbler type key lock; key removable only in locked position. Double wall barrier in ring base blocks thermostat tampering tools, yet allows air circulation. Ring base mounts directly over existing thermostat; no removal required. Meets or exceeds UL pry test and impact test standards. All covers are keyed... |
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Stainless Steel K-Type Thermocouple Insertion Probe 3 with spiral cable - set of 2 $11.99 This is a small size, reliable insertion thermocouple with a K-Type sensor. The sensor is housed at the tip of a 3 inch long stainless steel probe, which comes with a 2 inch long handle. It has a miniature type connector that will work with digital K-type thermometers. This k type probe can be inserted in liquids or any object you like to measure. It is much easier to clean than the thermocouple w... |
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3 K-Type Thermocouple Probe Sensor f. Digital Thermometer 752°F $5.99 This is a great, small and inexpensive insertion thermocouple with a K-Type sensor. The sensor is housed at the tip of a 3 inch long stainless steel probe, which comes with a small 2 inch long handle. It has a miniature type connector that will work with digital K-type thermometers (e.g. the DT6801 and DT6802, and the DT804 and DT804A). This probe can be inserted in liquids or any object you like ... |
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19 Extra Long Stainless Steel K-Type Thermocouple TC-5 Insertion Probe Sensor $27.99 This is a great extra long size thermocouple with a K-Type sensor. The sensor is housed at the tip of a 19 inch long stainless steel probe, which comes with a 3 inch long handle. It has a miniature type connector that will work with digital K-type thermometers. This probe can be inserted in liquids or any object you like to measure. It is much easier to clean than the thermocouple wire that comes... |
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Fieldpiece ATC1 Pipe Clamp (1 3/8) $45.86 The ATC1, K-type, pipe clamp thermocouple is used to take temperatures of pipes or any other cylindrical surface within its 3/8" to 1 3/8" jaw range. Using a pipe clamp thermocouple greatly facilitates taking superheat or subcooling measurements. Use the ATC1 for most A/C units. The ATC1 can be used with any of our meters that measure temperature and any thermometer accepting a K-type thermocouple... |
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