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

[Brian Eng]

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

[cid:1737cb15d8cc7597e591]
[cid:1737cb192cac7597e592]
[cid:1737cb1d463207cf5f03]


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

[https://logbooks.jlab.org/files/2020/07/3815911/clonsl2_20200722_081248.gif]

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Best regards,
Mohammad Hattawy.
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