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

[mhattawy@odu.edu]

Hello Marc,
    The magnets will be energized starting from 3:30 pm today to Monday
morning. You won’t be able to get to the gas panel, that is within the
fields of the magnets.


Mohammad

On Fri, Jul 24, 2020 at 11:11 Marc Mcmullen <mcmullen at jlab.org> wrote:

> Hi Jiwan,
>
> I am going to see if we have some spare supplies for that chassis. When I
> have the swap out in  hand, I'll need to coordinate with your group to
> complete the repair.
>
> The chassis will have to be de-energized and removed from the rack for
> repair. This means the MFC and the other connected sensors will have to be
> shut down while I make the repairs.
>
> Additionally, I will be doing this work either on the weekend or after
> hours, to avoid coming into contact with others.
>
> I'll let you know the status of the spares sometime today, so we can
> coordinate the system outage.
>
> Regards,
> Marc
> ------------------------------
> *From:* dsg-hallb_rtpc <dsg-hallb_rtpc-bounces at jlab.org> on behalf of
> Jiwan Poudel <jpoudel at jlab.org>
> *Sent:* Friday, July 24, 2020 9:33 AM
> *To:* dsg-hallb_rtpc at jlab.org <dsg-hallb_rtpc at jlab.org>
> *Subject:* Re: [dsg-hallb_rtpc] [EXTERNAL] Re: Pressure transducer of RTPC
>
> 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> 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>
> *Sent:* Thursday, July 23, 2020 11:20 AM
> *To:* Brian Eng <beng at jlab.org>
> *Cc:* dsg-hallb_rtpc at jlab.org <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
>
>
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> --
> Best regards,
> Mohammad Hattawy.
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-- 
Best regards,
Mohammad Hattawy.
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