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Chassis: Different types of chassis a
What is a thermocouple sensor?
A thermocouple is a sensor for measuring temperature. It consists of two dissimilar metals, joined together at o
unction of the two metals is heated or cooled a voltage is produced that can be correlated back to the tempera
thermocouple alloys are commonly available as wire.
What are the different thermocouple types?
A thermocouple is available in different combinations of metals or calibrations. The four most common calibrati
There are high temperature calibrations R, S, C and GB. Each calibration has a different temperature range and e
although the maximum temperature varies with the diameter of the wire used in the thermocouple. Although t
calibration dictates the temperature range, the maximum range is also limited by the diameter of the thermoco
very thin thermocouple may not reach the full temperature range.
View a complete reference tablefor each thermocouple. The table includes international color codes for thermo
temperature range and limits of error for almost every kind of thermocouple.
How do I choose a thermocouple type?Because a thermocouple measures in wide temperature ranges and can be relatively rugged, thermocouples are
industry. The following criteria are used in selecting a thermocouple:
Temperature range Chemical resistance of the thermocouple or sheath material Abrasion and vibration resistance
Installation requirements (may need to be compatible with existing equipment; existing holes may detediameter)
How do I know which junction type to choose?
Sheathed thermocouple probes are available with one of three junction types: grounded, ungrounded or expose
below:"Thermocouple Tip Styles"). At the tip of a grounded junction probe, the thermocouple wires are physica
inside of the probe wall. This results in good heat transfer from the outside, through the probe wall to the therm
an ungrounded probe, the thermocouple junction is detached from the probe wall. Response time is slower tha
but the ungrounded offers electrical isolation (see table below).
Room-Temperature Insulation Resistance
Ungrounded Thermocouple
http://www.omega.com/temperature/pdf/tc_temp_limits_range.pdfhttp://www.omega.com/temperature/pdf/tc_temp_limits_range.pdfhttp://www.omega.com/temperature/pdf/tc_temp_limits_range.pdf8/12/2019 mojack
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Nominal Sheath DiameterApplied dc Voltage
min.
Insulation Resistance
min.
Less than 0.90mm (0.03in.) 50V 100M Ohms
0.80-1.5mm (0.030 to0.059in.)
50V 500M Ohms
Greater than 1.5mm
(0.059in.)500V 1000M Ohms
The thermocouple in the exposed junction style protrudes out of the tip of the sheath and is exposed to the sur
environment. This type offers the best response time, but is limited in use to dry, noncorrosive and nonpressuri
What is response time?
A time constant has been defined as the time required by a sensor to reach 63.2% of a step change in temperat
set of conditions. Five time constants are required for the sensor to approach 100% of the step change value. An
thermocouple is the fastest responding. Also, the smaller the probe sheath diameter, the faster the response, b
temperature may be lower. Be aware, however, that sometimes the probe sheath cannot withstand the full tem
the thermocouple type.
MaterialMaximum
Temperature
Application Atmosphere
Oxidizing HydrogenVacuum Inert
304 SS 900C (1650F)Very
GoodGood
Very
Good
Very
Good
Inconel
6001148C (2100F)
Very
GoodGood
Very
Good
Very
Good
Thermocouple Ranges and Limits of Error
The table below shows temperature ranges and accuracy for J, K, E and T thermocouples.Additional thermocou
http://www.omega.com/techref/colorcodes.htmlhttp://www.omega.com/techref/colorcodes.htmlhttp://www.omega.com/techref/colorcodes.html8/12/2019 mojack
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Thermocouple Reference Tables
Thermocouples produce a voltage output that can be correlated to the temperature that the thermocouple is m
documents in the table below provide the thermoelectric voltage and corresponding temperature for a given th
Most of the documents also provide the thermocouple temperature range, limits of error and environmental co
click on a link below to see the related document
Thermocouple Type B( C) Thermocouple Type B( F)
Thermocouple Type C( C)
Thermocouple Type C( F)
Thermocouple Type E( C)
Thermocouple Type E( F)
Thermocouple Type J( C)
Thermocouple Type J( F)
Thermocouple Type K( C)
Thermocouple Type K( F)
Thermocouple Type N( C)
Thermocouple Type N( F)
Thermocouple Type R( C)
Thermocouple Type R( F)
Thermocouple Type S( C)
Thermocouple Type S( F)
Thermocouple Type T( C)
Thermocouple Type T( F)
Tungsten and Tungsten/
Rhenium
CHROMEGA vs. Gold-0.07
Atomic Percent Iron
http://www.omega.com/techref/colorcodes.htmlhttp://www.omega.com/temperature/Z/pdf/z212-213.pdfhttp://www.omega.com/temperature/Z/pdf/z212-213.pdfhttp://www.omega.com/temperature/Z/pdf/z231-236.pdfhttp://www.omega.com/temperature/Z/pdf/z239-240.pdfhttp://www.omega.com/temperature/Z/pdf/z241-245.pdfhttp://www.omega.com/temperature/Z/pdf/z206.pdfhttp://www.omega.com/temperature/Z/pdf/z221-224.pdfhttp://www.omega.com/temperature/Z/pdf/z203.pdfhttp://www.omega.com/temperature/Z/pdf/z216-217.pdfhttp://www.omega.com/temperature/Z/pdf/z204-206.pdfhttp://www.omega.com/temperature/Z/pdf/z218-220.pdfhttp://www.omega.com/temperature/Z/pdf/z214-215.pdfhttp://www.omega.com/temperature/Z/pdf/z237-238.pdfhttp://www.omega.com/temperature/Z/pdf/z210-211.pdfhttp://www.omega.com/temperature/Z/pdf/z228-230.pdfhttp://www.omega.com/temperature/Z/pdf/z208-209.pdfhttp://www.omega.com/temperature/Z/pdf/z225-227.pdfhttp://www.omega.com/temperature/Z/pdf/z207.pdfhttp://www.omega.com/temperature/Z/pdf/z223.pdfhttp://www.omega.com/temperature/Z/pdf/z246.pdfhttp://www.omega.com/temperature/Z/pdf/z246.pdfhttp://www.omega.com/temperature/Z/pdf/z247-248.pdfhttp://www.omega.com/temperature/Z/pdf/z247-248.pdfhttp://www.omega.com/techref/colorcodes.htmlhttp://www.omega.com/techref/colorcodes.htmlhttp://www.omega.com/techref/colorcodes.htmlhttp://www.omega.com/techref/colorcodes.htmlhttp://www.omega.com/techref/colorcodes.htmlhttp://www.omega.com/techref/colorcodes.htmlhttp://www.omega.com/techref/colorcodes.htmlhttp://www.omega.com/techref/colorcodes.htmlhttp://www.omega.com/techref/colorcodes.htmlhttp://www.omega.com/techref/colorcodes.htmlhttp://www.omega.com/techref/colorcodes.htmlhttp://www.omega.com/techref/colorcodes.htmlhttp://www.omega.com/techref/colorcodes.htmlhttp://www.omega.com/techref/colorcodes.htmlhttp://www.omega.com/techref/colorcodes.htmlhttp://www.omega.com/techref/colorcodes.htmlhttp://www.omega.com/techref/colorcodes.htmlhttp://www.omega.com/techref/colorcodes.htmlhttp://www.omega.com/techref/colorcodes.htmlhttp://www.omega.com/techref/colorcodes.htmlhttp://www.omega.com/techref/colorcodes.htmlhttp://www.omega.com/techref/colorcodes.htmlhttp://www.omega.com/temperature/Z/pdf/z247-248.pdfhttp://www.omega.com/temperature/Z/pdf/z247-248.pdfhttp://www.omega.com/temperature/Z/pdf/z246.pdfhttp://www.omega.com/temperature/Z/pdf/z246.pdfhttp://www.omega.com/temperature/Z/pdf/z223.pdfhttp://www.omega.com/temperature/Z/pdf/z207.pdfhttp://www.omega.com/temperature/Z/pdf/z225-227.pdfhttp://www.omega.com/temperature/Z/pdf/z208-209.pdfhttp://www.omega.com/temperature/Z/pdf/z228-230.pdfhttp://www.omega.com/temperature/Z/pdf/z210-211.pdfhttp://www.omega.com/temperature/Z/pdf/z237-238.pdfhttp://www.omega.com/temperature/Z/pdf/z214-215.pdfhttp://www.omega.com/temperature/Z/pdf/z218-220.pdfhttp://www.omega.com/temperature/Z/pdf/z204-206.pdfhttp://www.omega.com/temperature/Z/pdf/z216-217.pdfhttp://www.omega.com/temperature/Z/pdf/z203.pdfhttp://www.omega.com/temperature/Z/pdf/z221-224.pdfhttp://www.omega.com/temperature/Z/pdf/z206.pdfhttp://www.omega.com/temperature/Z/pdf/z241-245.pdfhttp://www.omega.com/temperature/Z/pdf/z239-240.pdfhttp://www.omega.com/temperature/Z/pdf/z231-236.pdfhttp://www.omega.com/temperature/Z/pdf/z212-213.pdf8/12/2019 mojack
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Types of Thermocouples
Beaded Wire Thermocouple
A beaded wire thermocouple is the simplest form of thermocouple. It consists of two piec
wire joined together with a welded bead. Because the bead of the thermocouple is expose
application limitations. The beaded wire thermocouple should not be used with liquids tha
oxidize the thermocouple alloy. Metal surfaces can also be problematic. Often metal surfa
are used to ground electrical systems The indirect connection to an electrical system could
thermocouple measurement. In general, beaded wire thermocouples are a good choice fo
of gas temperature. Since they can be made very small, they also provide very fast respon
Thermocouple Probe
A thermocouple probe consists of thermocouple wire housed inside a metallic tube. The w
referred to as the sheath of the probe. Common sheath materials include stainless steel a
supports higher temperature ranges than stainless steel, however, stainless steel is often
its broad chemical compatibility. For very high temperatures, other exotic sheath material
View our line ofhigh temperature exotic thermocouple probes.
The tip of the thermocouple probe is available in three different styles. Grounded, ungrou
With a grounded tip the thermocouple is in contact with the sheath wall. A grounded junc
response time but it is most susceptible to electrical ground loops. In ungrounded junction
is separated from the sheath wall by a layer of insulation. The tip of the thermocouple pro
sheath wall with an exposed junction. Exposed junction thermocouples are best suited for
Thermocouple Tip Styles
Grounded
Thermocouple
Ungrounded
Thermocouple
Exposed
Thermocouple
http://www.omega.com/toc_asp/subsectionSC.asp?subsection=A06&book=Temperaturehttp://www.omega.com/toc_asp/subsectionSC.asp?subsection=A06&book=Temperaturehttp://www.omega.com/toc_asp/subsectionSC.asp?subsection=A06&book=Temperaturehttp://www.omega.com/Guides/http://www.omega.com/Guides/http://www.omega.com/Guides/http://www.omega.com/Guides/http://www.omega.com/Guides/http://www.omega.com/Guides/http://www.omega.com/Guides/http://www.omega.com/Guides/http://www.omega.com/Guides/http://www.omega.com/toc_asp/subsectionSC.asp?subsection=A06&book=Temperature8/12/2019 mojack
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Surface Probe
Measuring the temperature of a solid surface is difficult for most types of temperature sen
assure an accurate measurement, the entire measurement area of the sensor must be in c
surface. This is difficult when working with a rigid sensor and a rigid surface. Since thermo
pliable metals, the junction can be formed flat and thin to provide maximum contact with
These thermocouples are an excellent choice for surface measurement. The thermocoupl
a mechanism which rotates, making it suitable for measuring the temperature of a moving
ChromegaAlomega.
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