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correct RICH N2 flow rate, flow meter location #9

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8 changes: 4 additions & 4 deletions rich/rich-nim.tex
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Expand Up @@ -617,7 +617,7 @@ \subsection{Services}
The CLAS12 RICH requires various services, namely power, cooling, and gas purge whose number of lines has to be
minimized and installed outside of the CLAS12 acceptance. A continuous nitrogen flow, supplied by the Hall~B gas
distribution system, is provided in order to keep the relative humidity inside the RICH vessel at the few percent
level. The flow is set to about 60~l/m to ensure a complete inner volume exchange in a few hours.
level. The flow is set to about 40~l/m to ensure a complete inner volume exchange in a few hours.
%The nitrogen is supplied by the Hall-B distribution system based on a large dewar filled of liquid nitrogen.
A backup system has been realized by a stack of nitrogen bottles to allow for up to 3 days of gas flow in case of
failure of the primary distribution system.
Expand Down Expand Up @@ -1010,7 +1010,7 @@ \section{RICH Slow Control and Interlocks}
\label{fig:Online_FPGATempMap}
\end{figure}

The locations of the temperature and humidity sensors, and the air and nitrogen flow meters inside the electronics
The locations of the temperature and humidity sensors, and the air and nitrogen inlet paths inside the electronics
panel and nitrogen volume are shown in Figs.~\ref{Fig:RICH_sensors_e_panel} and \ref{Fig:RICH_sensors_nitrogen},
respectively. The inner temperature of the electronics panel ranges between $\rm 38.5^\circ$C and $\rm 44.5^\circ$C
moving from the bottom towards the top of the module, whereas the external temperature stays below $\rm 34.5^\circ$C,
Expand Down Expand Up @@ -1040,8 +1040,8 @@ \section{RICH Slow Control and Interlocks}
%\label{fig:Online_EPanelTempStrip}
%\end{figure}

The nitrogen flow and the RICH internal relative humidity are measured by several probes installed inside the
detector.
The RICH internal relative humidity is measured by several probes installed inside the detector and nitrogen flow is
measured by external flow meters at the RICH nitrogen supply gas panel.
%A strip chart of the reported humidity spanning a time interval of several days is shown in Fig.\ref{fig:Online_Humidity}.
An alarm is sent out in case the humidity exceeds 5\% or in case the nitrogen flow drops below the normal value.
In the latter case, the backup system starts working to restore the normal flow level and to ensure safe humidity
Expand Down