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

[mhattawy@odu.edu]

I left JLab. Jiwan can you follow on this.

On Thu, Jul 23, 2020 at 14:30 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
>
>
>
> 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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> https://mailman.jlab.org/mailman/listinfo/dsg-hallb_rtpc
>
-- 
Best regards,
Mohammad Hattawy.
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