[Dsg-rich] PPM humidity sensor for RICH

[Sandro Tomassini]

Hi Tyler,

The formula I sent to you in the link below is an approximate formula in 
the range of temperature and humidity we are considering.

Unfortunately this formula to evaluate the RH starting from the ambient 
temperature T and Dew point Temperature Td, is valid in the following range:

0°C < T < 60 °C
1% < RH < 100%
0 °C < Td < 50 °C

Indeed we roughly have a Td=-62°C and  a RH<1%.

There are some other formulas, even though I do not have the exact 
formula good for a wide temperature range.
See the file attached and later or tomorrow we can discuss.

Many thanks
Sandro





Il 29/11/17, 22:51, Tomassini Sandro ha scritto:
> Hi Tyler
> You can use the formula in the link below: 
> https://urldefense.proofpoint.com/v2/url?u=http-3A__andrew.rsmas.miami.edu_bmcnoldy_Humidity.html&d=DwIDaQ&c=lz9TcOasaINaaC3U7FbMev2lsutwpI4--09aP8Lu18s&r=9YtCiIg5kE6YCo5iFAyFiMgzNCONVcBowotEOgGZ4Co&m=PndMGm9SbWP7L4Lzb84TADJTZcLdGPDq41YmC-vwNP0&s=FPtQSApKQfjGA3qc6hHqbuAZr4K-qUwUGMQOa0c5hrc&e= .
>
> Ciao
> Sandro
>
> Inviato da Blue <https://urldefense.proofpoint.com/v2/url?u=http-3A__www.bluemail.me_r-3Fb-3D11061&d=DwIDaQ&c=lz9TcOasaINaaC3U7FbMev2lsutwpI4--09aP8Lu18s&r=9YtCiIg5kE6YCo5iFAyFiMgzNCONVcBowotEOgGZ4Co&m=PndMGm9SbWP7L4Lzb84TADJTZcLdGPDq41YmC-vwNP0&s=JFnmQekXVT8TvRSjQWOrKK3VNqxB9QjbPiFwaK3ow1c&e= >
> Il giorno 29 nov 2017, alle ore 21:20, Tyler Lemon <tlemon at jlab.org 
> <mailto:tlemon at jlab.org>> ha scritto:
>
>     Hello Marco Mirazita,
>
>     This is to inform you that we have a spare hygrometer that
>     measures the dewpoint or concentration of water in air.
>
>     We have the sensor on hand, but we still need the read-out
>     instrumentation. Marc has gone to Hall B to get the read-out
>     instrumentation that we could use.
>
>     We will have to convert the output of the sensor, in dewpoint or
>     ppm, to relative humidity to be able to compare the hygrometer
>     measurements to the interlock humidity sensors.
>
>     Best regards,
>     Tyler
>
>     ------------------------------------------------------------------------
>
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>     Dsg-rich at jlab.org
>     https://mailman.jlab.org/mailman/listinfo/dsg-rich
>

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