<div><div dir="auto">I left JLab. Jiwan can you follow on this. </div></div><div><br><div class="gmail_quote"><div dir="ltr" class="gmail_attr">On Thu, Jul 23, 2020 at 14:30 Brian Eng <<a href="mailto:beng@jlab.org">beng@jlab.org</a>> wrote:<br></div><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex">
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Thanks Mohammad,</div>
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Fortunately it already has the pinout on it.</div>
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Unplug that connector and measure between pins 6 & 5 for -15 VDC, 7 & 5 for +15 VDC. If those are good then it isn't power.</div>
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Next open the backshell of that connector and connect probes to 2 & 12 to see if it is reading the same voltage as the cRIO (~4 VDC). If the reading at the sensor matches the cRIO it probably isn't the cabling.</div>
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Lastly I would disconnect the detector and open the valves so that sensor is exposed to ambient pressure and see what it reads, if it's still ~400 torr then it is most likely the sensor, but could be the cabling/chassis.</div>
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To eliminate that possibility the sensor would need to be removed and tested on a bench using the same pins as listed above.</div>
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I don't think we (DSG) have a direct replacement for that, so I'd try Hall B and if not you'd need to talk with Bob as that involves changing a pressure system component.</div>
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<div id="m_5084444175556781349divRplyFwdMsg" dir="ltr"><font face="Calibri, sans-serif" color="#000000" style="font-size:11pt"><b>From:</b> dsg-hallb_rtpc <<a href="mailto:dsg-hallb_rtpc-bounces@jlab.org" target="_blank">dsg-hallb_rtpc-bounces@jlab.org</a>> on behalf of <a href="mailto:mhattawy@odu.edu" target="_blank">mhattawy@odu.edu</a> <<a href="mailto:mohammad.hattawy@gmail.com" target="_blank">mohammad.hattawy@gmail.com</a>><br>
<b>Sent:</b> Thursday, July 23, 2020 1:21 PM<br>
<b>To:</b> <a href="mailto:dsg-hallb_rtpc@jlab.org" target="_blank">dsg-hallb_rtpc@jlab.org</a> <<a href="mailto:dsg-hallb_rtpc@jlab.org" target="_blank">dsg-hallb_rtpc@jlab.org</a>><br>
<b>Subject:</b> [dsg-hallb_rtpc] [EXTERNAL] Re: Pressure transducer of RTPC</font>
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<div dir="ltr">On Thu, Jul 23, 2020 at 12:38 Brian Eng <<a href="mailto:beng@jlab.org" target="_blank">beng@jlab.org</a>> wrote:<br>
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Hi Jiwan,</div>
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The voltage being read back by the cRIO is ~4V which is being converted correctly to ~400 torr.</div>
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Can you get the full model number of PT334 so I can better give some suggestions on what you guys could measure to help troubleshoot?</div>
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Off-hand some of the things that could be wrong is: the sensor not getting proper supply voltage, a loose connection of the output to the cRIO as it is getting some voltage back, or a bad sensor (let's hope it isn't that as that was the only one we had in that
range).</div>
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<div id="m_5084444175556781349x_m_-3673964264327518911divRplyFwdMsg" dir="ltr"><font face="Calibri, sans-serif" color="#000000" style="font-size:11pt"><b>From:</b> Jiwan Poudel <<a href="mailto:jpoudel@jlab.org" target="_blank">jpoudel@jlab.org</a>><br>
<b>Sent:</b> Thursday, July 23, 2020 11:20 AM<br>
<b>To:</b> Brian Eng <<a href="mailto:beng@jlab.org" target="_blank">beng@jlab.org</a>><br>
<b>Cc:</b> <a href="mailto:dsg-hallb_rtpc@jlab.org" target="_blank">dsg-hallb_rtpc@jlab.org</a> <<a href="mailto:dsg-hallb_rtpc@jlab.org" target="_blank">dsg-hallb_rtpc@jlab.org</a>><br>
<b>Subject:</b> Pressure transducer of RTPC</font>
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<div>Hello Brian,</div>
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<div>RTPC abs. Pressure transducer seems not working properly. This should show around 760 torr (~ 1 atm), but showing about 400 torr only. What could be the reason?</div>
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<div>Thank you,</div>
<div>Jiwan</div>
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-- <br>
<div dir="ltr">Best regards,<br>
Mohammad Hattawy.<br>
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</blockquote></div></div>-- <br><div dir="ltr" class="gmail_signature" data-smartmail="gmail_signature">Best regards,<br>Mohammad Hattawy.<br></div>