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

[JIWAN POUDEL]

I will check the connections and verify it is correct before plugging in to chassis.

Thank you,
Jiwan

> On Jul 27, 2020, at 6:22 PM, mhattawy at odu.edu <mohammad.hattawy at gmail.com> wrote:
> 
> Thanks Marc, 
>    Maybe the beacon was on, but for sure the magnets are off. Unfortunately, I can’t get to the Lab till Wednesday. Jiwan can you connect it back?
> 
> Mohammad
> 
> On Mon, Jul 27, 2020 at 18:18 Marc Mcmullen <mcmullen at jlab.org <mailto:mcmullen at jlab.org>> wrote:
> Hi Mohammad and Jiwan,
> 
> I have replaced the fuse in the chassis and checked the internal components for issues. I did not reconnect the connector for the PDT 208 (differential pressure DMS to RTPC) because I could not verify if the contacts are wired correctly since it was reconnected, because the magnet beacon is on. I have attached a pinout which can be used to verify connections prior to plugging it back into the interface chassis.
> 
> Regards,
> Marc
> From: Marc Mcmullen <mcmullen at jlab.org <mailto:mcmullen at jlab.org>>
> Sent: Friday, July 24, 2020 11:18 AM
> 
> To: 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: Re: [dsg-hallb_rtpc] [EXTERNAL] Re: Pressure transducer of RTPC
>  
> Thanks Mohammad,
> 
> I'll look into the spares first. Then contact you about the repair.
> 
> Regards,
> Marc
> From: dsg-hallb_rtpc <dsg-hallb_rtpc-bounces at jlab.org <mailto:dsg-hallb_rtpc-bounces at jlab.org>> on behalf of mhattawy at odu.edu <mailto:mhattawy at odu.edu> <mohammad.hattawy at gmail.com <mailto:mohammad.hattawy at gmail.com>>
> Sent: Friday, July 24, 2020 11:16 AM
> To: 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: Re: [dsg-hallb_rtpc] [EXTERNAL] Re: Pressure transducer of RTPC
>  
> 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 <mailto: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 <mailto:dsg-hallb_rtpc-bounces at jlab.org>> on behalf of Jiwan Poudel <jpoudel at jlab.org <mailto:jpoudel at jlab.org>>
> Sent: Friday, July 24, 2020 9:33 AM
> To: 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: 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 <mailto: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 <mailto:dsg-hallb_rtpc-bounces at jlab.org>> on behalf of mhattawy at odu.edu <mailto:mhattawy at odu.edu> <mohammad.hattawy at gmail.com <mailto:mohammad.hattawy at gmail.com>>
>> Sent: Thursday, July 23, 2020 1:21 PM
>> To: 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: [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>
> _______________________________________________
> 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>
> -- 
> Best regards,
> Mohammad Hattawy.
> _______________________________________________
> dsg-hallb_rtpc mailing list
> dsg-hallb_rtpc at jlab.org
> 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/20200727/5cc8e4bd/attachment-0001.html>