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

Tue Jul 28 10:51:38 EDT 2020

If you could not open the picture that Jiwan attached to his replay, here
it is.

Mohammad.

On Tue, Jul 28, 2020 at 10:48 AM mhattawy at odu.edu <
mohammad.hattawy at gmail.com> wrote:

> 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
>>>>
>>>>
>>>> _______________________________________________
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>>>>
>>>> --
>>>> Best regards,
>>>> Mohammad Hattawy.
>>>> _______________________________________________
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>>>> https://mailman.jlab.org/mailman/listinfo/dsg-hallb_rtpc
>>>>
>>>>
>>>> _______________________________________________
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>>>> 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.
>

-- 
Best regards,
Mohammad Hattawy.
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