[dsg-hallb_rtpc] [EXTERNAL] Re: Pressure transducer of RTPC

[Jiwan Poudel]

Hello Brian,

Those power pins are not showing what it should show. Pin 6 and 5 showing -28.7V and pins 7 and 5 showing only 1.3V.

Thank you,
Jiwan

> On Jul 23, 2020, at 2:29 PM, Brian Eng <beng at jlab.org> wrote:
> 
> Thanks Mohammad,
> 
> Fortunately it already has the pinout on it.
> 
> 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.
> 
> 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.
> 
> 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.
> 
> To eliminate that possibility the sensor would need to be removed and tested on a bench using the same pins as listed above.
> 
> 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.
> 
> From: dsg-hallb_rtpc <dsg-hallb_rtpc-bounces at jlab.org> on behalf of mhattawy at odu.edu <mohammad.hattawy at gmail.com>
> Sent: Thursday, July 23, 2020 1:21 PM
> To: dsg-hallb_rtpc at jlab.org <dsg-hallb_rtpc at jlab.org>
> Subject: [dsg-hallb_rtpc] [EXTERNAL] Re: Pressure transducer of RTPC
>  
> <image_123923953.JPG>
> <image_123923953.JPG>
> <image_6483441.JPG>
> 
> 
> On Thu, Jul 23, 2020 at 12:38 Brian Eng <beng at jlab.org <mailto:beng at jlab.org>> wrote:
> Hi Jiwan,
> 
> The voltage being read back by the cRIO is ~4V which is being converted correctly to ~400 torr.
> 
> 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?
> 
> 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).
> 
> From: Jiwan Poudel <jpoudel at jlab.org <mailto:jpoudel at jlab.org>>
> Sent: Thursday, July 23, 2020 11:20 AM
> To: Brian Eng <beng at jlab.org <mailto:beng at jlab.org>>
> Cc: dsg-hallb_rtpc at jlab.org <mailto:dsg-hallb_rtpc at jlab.org> <dsg-hallb_rtpc at jlab.org <mailto:dsg-hallb_rtpc at jlab.org>>
> Subject: Pressure transducer of RTPC
>  
> Hello Brian,
> 
> 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?
> 
> Thank you,
> Jiwan
> 
> 
> 
> _______________________________________________
> dsg-hallb_rtpc mailing list
> dsg-hallb_rtpc at jlab.org <mailto:dsg-hallb_rtpc at jlab.org>
> https://mailman.jlab.org/mailman/listinfo/dsg-hallb_rtpc <https://mailman.jlab.org/mailman/listinfo/dsg-hallb_rtpc>
> -- 
> Best regards,
> Mohammad Hattawy.
> _______________________________________________
> dsg-hallb_rtpc mailing list
> dsg-hallb_rtpc at jlab.org <mailto:dsg-hallb_rtpc at jlab.org>
> https://mailman.jlab.org/mailman/listinfo/dsg-hallb_rtpc <https://mailman.jlab.org/mailman/listinfo/dsg-hallb_rtpc>
-------------- next part --------------
An HTML attachment was scrubbed...
URL: <https://mailman.jlab.org/pipermail/dsg-hallb_rtpc/attachments/20200724/6e36a538/attachment.html>