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

Tue Jul 28 10:48:24 EDT 2020

Hello Marc,
 Following our phone call this morning, It has to be what you call PDT2.

Mohammad.

On Tue, Jul 28, 2020 at 10:45 AM Jiwan Poudel <jpoudel at jlab.org> wrote:

> Hello all,
>
> We have two differential transducer (PDTs): RTPC-DMS (PDT332) and
> RTPC-Buffer(PDT208). So I am taking about RTPC-DMS pressure transducer. I
> have only this photo right now, where you can see one two wires are coming
> out from PDT.
>
> Thank you,
> Jiwan
>
>
>
> On Jul 28, 2020, at 10:19 AM, mhattawy at odu.edu <mohammad.hattawy at gmail.com>
> wrote:
>
> Hello Jiwan,
>    Sounds like the DSG group is not fully sure about the specification of
> this transducer as they used to name it PT2. Can you please send them some
> pics of the transducer as the ones I did for the other one.
>
> Mohammad
>
>
> On Tue, Jul 28, 2020 at 10:04 AM mhattawy at odu.edu <
> mohammad.hattawy at gmail.com> wrote:
>
>> Dear DSG members,
>>     Please send us the cables color code for PDT332 to connect it back.
>>
>> Regards,
>> Mohammad.
>>
>> On Mon, Jul 27, 2020 at 20:37 <jpoudel at jlab.org> wrote:
>>
>>> I am sorry to write again, but I have to inform to you all correctly. I
>>> wanted to write "cable from transducer pt332 is not attached to chassis but
>>> GUI is showing a large negative value. How?" Previus email was confusing
>>> (isn't is changed to is) so have to write again.
>>>
>>>
>>> On Jul 27, 2020 20:09, jpoudel at jlab.org wrote:
>>>
>>> PDT208 is working fine, the connection is good. I verified connection
>>> and connected it to chassis. Its showing quite reasonable reading also.
>>>
>>> PDT332( RTPC-DMS diff) is showing some weird number in epics GUI even
>>> before its connected to system. Cable from transducer is attached at
>>> chassis. How? I have no idea.( see attached) I think it should show zero. I
>>> compare PDT208(rtpc-buffer) reading removing cable from chassis, and it
>>> shows zero.
>>>
>>> In addition, Connecting wires at transducer PDT332 are coming out. So we
>>> need color code of cables before connecting it.
>>>
>>> Thank you,
>>> Jiwan
>>>
>>>
>>>
>>> On Jul 27, 2020 19:18, jpoudel at jlab.org wrote:
>>>
>>> Hello Marc,
>>>
>>> Can you please send me the connection of PDT 332 (color code of cables)
>>> also?
>>>
>>> In PDT 208, white and green are together. Are they -15V?
>>>
>>> Thank you,
>>> Jiwan
>>>
>>> On Jul 27, 2020 18:40, JIWAN POUDEL <jpoud001 at odu.edu> wrote:
>>>
>>> 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> 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>
>>> *Sent:* Friday, July 24, 2020 11:18 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
>>>
>>> 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> on behalf of
>>> mhattawy at odu.edu <mohammad.hattawy at gmail.com>
>>> *Sent:* Friday, July 24, 2020 11:16 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 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
>>>
>>>
>>> _______________________________________________
>>> dsg-hallb_rtpc mailing list
>>> dsg-hallb_rtpc at jlab.org
>>> 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
>>>
>>>
>>> _______________________________________________
>>> dsg-hallb_rtpc mailing list
>>> dsg-hallb_rtpc at jlab.org
>>> 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
>>>
>>> --
>>> Best regards,
>>> Mohammad Hattawy.
>>> _______________________________________________
>>> dsg-hallb_rtpc mailing list
>>> dsg-hallb_rtpc at jlab.org
>>> https://mailman.jlab.org/mailman/listinfo/dsg-hallb_rtpc
>>>
>>>
>>>
>>>
>>>
>>> _______________________________________________
>>> dsg-hallb_rtpc mailing list
>>> dsg-hallb_rtpc at jlab.org
>>> https://mailman.jlab.org/mailman/listinfo/dsg-hallb_rtpc
>>>
>> --
>> Best regards,
>> Mohammad Hattawy.
>>
>
>
> --
> Best regards,
> Mohammad Hattawy.
>
>
>

-- 
Best regards,
Mohammad Hattawy.
-------------- next part --------------
An HTML attachment was scrubbed...
URL: <https://mailman.jlab.org/pipermail/dsg-hallb_rtpc/attachments/20200728/fe2a56dd/attachment-0001.html>