What is platinum wire used for?
Platinum Wire is used in many applications including gasket or o-ring fabrication, thermocouples, electrical contacts, and heater coils.
Why platinum is used in thermocouple?
Temperature sensors based on precious metals demonstrate outstanding resistance to corrosion, thus guaranteeing long service life and reliable measurement accuracy. For measuring high temperatures of up to 1700°C, thermocouple wires made of high-purity platinum or platinum/rhodium alloys are therefore the solution.
What is thermocouple wire used for?
What is a thermocouple Wire? The thermocouple wire or cable is used to manufacture thermocouple probes in order to sense temperature using the point of cold junction compensation (cjc end).
Is platinum used in thermocouples?
The platinum thermocouple is probably the most accurate and convenient method now available for the measurement of high temperature in industrial processes. The melting point of platinum is 1769°C and that of its highest melting rhodium alloy useful for thermocouple purposes is about 1890°C.
Why is a platinum wire used for flame test?
Platinum is especially good for this because it is unreactive, and does not produce a color in the flame which will mask the presence of other metals.
What is so special about platinum?
It is extremely resistant to tarnishing and corrosion (which makes it known as a “noble metal”) and is very soft and malleable, making it easy to shape. It is also ductile, making it easy to stretch into wire, and unreactive, which means it doesn’t oxidize and is unaffected by common acids.
How much platinum is in a thermocouple?
Type B Thermocouple Wire For a Type B thermocouple, one conductor will be 70% platinum, 30% rhodium, while the other will be 94% platinum, 6% rhodium. Type B thermocouples are used for very high temperature measurements, with a usable range of around 800°C to 1800°C.
What are the types of thermocouples?
Thermocouple Types
| Thermocouple Type | Useful/General Application Range |
|---|---|
| C* | 1650-2315°C (3000-4200°F) |
| E** | 95-900°C (200-1650°F) |
| J | 95-760°C (200-1400°F) |
| K** | 95-1260°C (200-2300°F) |
Can you use thermocouple wire for an RTD?
RTDs are special resistors whose resistance value changes with temperature in a known way. RTDs are connected to the temperature recording or process control instrumentation using ordinary copper instrumentation cable. Thermocouple wire is not required to connect an RTD.
Is thermocouple a copper wire?
Thermocouple wires use various alloy combinations while the conductors in electrical wire are usually copper. 2.
What color is platinum wire?
silvery-white
Platinum is a very heavy, soft, malleable and ductile, silvery-white metal. (For more information about phosphorus, click here.) The sample below is a small piece of platinum wire that has been imbedded into a glass rod for use in flame tests….
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What kind of thermocouple wire is used for?
Type B thermocouples are used for very high temperature measurements, with a usable range of around 800°C to 1800°C. A Type R thermocouple will have one conductor with 87% platinum, 13% rhodium, and the other conductor 100% pure platinum. It’s used for temperatures up to 1600°C, in applications such as the steel industry.
Why is platinum used as a conductor in thermocouples?
It cannot be oxidised, withstands most acids, has high resistance to corrosion and high temperatures, and is electrically stable and an efficient conductor. In thermocouples, platinum is often combined in an alloy with rhodium, a chemically inert transition metal which is also part of the platinum group.
What kind of wire is made of platinum?
A new type of platinum:platinum-rhodium thermocouple wire which incorporates traces of yttrium in the platinum limb has been developed and tested in some typical working environments.
How long does a platinum thermocouple last?
For instance thermocouples in the glass industry are used at temperatures of 1000 to 1200°C and last for 5 to 7 years. At these temperatures the grain size of the platinum negative limb will increase; creep will occur and the material will become weak.