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What is a Thermocouple and how do they work - A GalcoTV Tech Tip

WEBVTT
Kind: captions
Language: en

00:00:00.030
a thermocouple is a thermoelectric
00:00:09.259 00:00:09.269 device for measuring temperature
00:00:11.530 00:00:11.540 consisting of two wires of different
00:00:13.879 00:00:13.889 metals connected at one end when thermal
00:00:17.420 00:00:17.430 energy is applied a proportional voltage
00:00:20.179 00:00:20.189 is developed between the junction there
00:00:23.810 00:00:23.820 are many types of thermocouples each
00:00:26.150 00:00:26.160 with its own unique characteristics in
00:00:28.550 00:00:28.560 terms of temperature range durability
00:00:31.870 00:00:31.880 vibration resistance chemical resistance
00:00:35.389 00:00:35.399 and application compatibility types J K
00:00:40.430 00:00:40.440 T and E are base metal thermocouples and
00:00:44.450 00:00:44.460 are the most common type of
00:00:46.130 00:00:46.140 thermocouples Type R s and V are noble
00:00:51.380 00:00:51.390 metal thermocouples which are used in
00:00:53.869 00:00:53.879 high temperature applications
00:00:55.570 00:00:55.580 [Music]
00:00:56.799 00:00:56.809 thermocouples are manufactured in a
00:00:59.240 00:00:59.250 variety of styles such as thermocouple
00:01:02.029 00:01:02.039 probes thermocouple probes with
00:01:04.640 00:01:04.650 connectors transition joint thermocouple
00:01:07.940 00:01:07.950 probes infrared thermocouples fare wire
00:01:12.200 00:01:12.210 thermocouples or even just thermocouple
00:01:15.200 00:01:15.210 wire thermocouple probes are available
00:01:18.920 00:01:18.930 with one of three Junction types
00:01:21.340 00:01:21.350 grounded ungrounded or exposed at the
00:01:26.120 00:01:26.130 tip of a grounded Junction probe the
00:01:28.730 00:01:28.740 thermocouple wires are physically
00:01:30.620 00:01:30.630 attached to the inside of the probe wall
00:01:32.800 00:01:32.810 this results in good heat transfer from
00:01:35.719 00:01:35.729 the outside through the probe wall
00:01:37.969 00:01:37.979 through the thermocouple Junction in an
00:01:41.330 00:01:41.340 ungrounded probe the thermocouple
00:01:43.819 00:01:43.829 Junction is detached from the probe wall
00:01:46.510 00:01:46.520 response time is slower than the
00:01:48.620 00:01:48.630 grounded style but the ungrounded offers
00:01:51.289 00:01:51.299 electrical isolation the thermocouple in
00:01:54.830 00:01:54.840 the exposed Junction style protrudes out
00:01:57.289 00:01:57.299 of the tip of the sheath and is exposed
00:01:59.719 00:01:59.729 to the surrounding environment this type
00:02:02.749 00:02:02.759 offers the best response time but is
00:02:05.209 00:02:05.219 limited in use to non-corrosive and
00:02:07.429 00:02:07.439 non-pressurized applications
00:02:10.080 00:02:10.090 when two wires composed of dissimilar
00:02:13.240 00:02:13.250 metals are joined at one end and is
00:02:15.340 00:02:15.350 heated there is a continuous voltage
00:02:17.860 00:02:17.870 produced in the thermoelectric circuit
00:02:20.730 00:02:20.740 this means that when the junction of the
00:02:23.350 00:02:23.360 two metals is heated or cooled a voltage
00:02:26.650 00:02:26.660 is produced that can be correlated back
00:02:28.780 00:02:28.790 to the temperature it is important to
00:02:32.620 00:02:32.630 remember that both accuracy and range
00:02:34.900 00:02:34.910 depend on things such as the
00:02:36.730 00:02:36.740 thermocouple alloys the temperature
00:02:39.430 00:02:39.440 being measured the construction of the
00:02:42.070 00:02:42.080 sensor the material of the sheath the
00:02:45.940 00:02:45.950 media being measured the state of the
00:02:48.910 00:02:48.920 media and the diameter of the
00:02:51.400 00:02:51.410 thermocouple wire stay tuned to Galco TV
00:02:55.060 00:02:55.070 for more tech tips and be sure to visit
00:02:57.370 00:02:57.380 galco.com to view our full product
00:02:59.710 00:02:59.720 catalog
00:03:01.880 00:03:01.890 00:03:10.460 00:03:10.470

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