11/30/2019 5:51 PM | |
Posts: 2 Rating: (0) |
Sorry to reopen this discussion, but to get the exact temperature I am having to divide by 100 and not 10. Can you tell me why?
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Last edited by: Jen_Moderator at: 12/02/2019 11:42:22New subject after splitting |
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11/30/2019 6:39 PM | |
Joined: 3/28/2015 Last visit: 8/25/2024 Posts: 721 Rating: (213) |
Hello, Perhaps the following FAQ might help: Description: The following holds for temperature measurements:
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Last edited by: Jen_Moderator at: 12/02/2019 11:45:47Optimized link. Eng.Mohamed Ibrahim |
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12/1/2019 4:19 PM | |
Joined: 9/27/2006 Last visit: 9/25/2024 Posts: 12283 Rating: (2685)
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Hello MSC Jonnathan; Basically the issue depends on the type of the PT 100 sensor you are using. RTD is a very generic term that is used by manufacturers often without discrimination. However, there are many variations on these products: https://en.wikipedia.org/wiki/Resistance_thermometer The current international standard that specifies tolerance and the temperature-to-electrical resistance relationship for platinum resistance thermometers (PRTs) is IEC 60751:2008; ASTM E1137 is also used in the United States. By far the most common devices used in industry have a nominal resistance of 100 ohms at 0 °C and are called Pt100 sensors ("Pt" is the symbol for platinum, "100" for the resistance in ohms at 0 °C). It is also possible to get Pt1000 sensors, where 1000 is for the resistance in ohms at 0 °C. The sensitivity of a standard 100 Ω sensor is a nominal 0.385Ω/°C. RTDs with a sensitivity of 0.375 and 0.392Ω/°C, as well as a variety of others, are also available. If the sensor you use has a resistance of 1000 Ohms at 0C (check the datasheet), or if it is designated a RTD KLIMA (ambient temperature, higher precision) then you need to divide the reading by 100.0 to convert the RTD value into the actual temeprature, maintaining 2 decimals. Standard RTDs (PT100) require a divisor of 10.0. The attachment in this link clearly shows that the factor to convert reading to temperature for PT100 standard modules is 10.0, whereas for Klima (PT1000) it is 100.0. Hope this helps, Daniel Chartier |
Last edited by: dchartier at: 12/01/2019 16:20:12Last edited by: dchartier at: 12/01/2019 16:41:00Last edited by: dchartier at: 12/03/2019 00:48:17 |
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