[Dsg-ft] nitrogen purge and humidity

[Raffaella De Vita]

Thanks Amanda!

> Il giorno 29 giu 2017, alle ore 20:10, Amanda Hoebel <amandah at jlab.org> ha scritto:
> 
> Hi Raffaella,
> 
> Yes we can do this test. We will start the gas flow tomorrow and monitor the humidity values.
> 
> Regards,
> Amanda
> 
> ----- Original Message -----
> From: "raffaella devita" <Raffaella.Devita at ge.infn.it>
> To: "Amanda Hoebel" <amandah at jlab.org>, "dsg-ft" <dsg-ft at jlab.org>
> Sent: Thursday, June 29, 2017 9:03:09 AM
> Subject: Re: [Dsg-ft] nitrogen purge and humidity
> 
> Hi Amanda,
> we have checked the position of the humidity sensors inside the 
> calorimeter and it looks like indeed one of the two, supposedly sensor 
> 1, is closer to the nitrogen inlet that the other one. This would 
> explain the different values reported by the sensors when the nitrogen 
> is flowing. To have a confirmation, it may be useful to do the following 
> test:
> - restore the gas flow if it was stopped to bring down the humidity 
> again at values close to the 10 or 26% measured last week;
> - stop the flow and check whether the humidity values reported by the 
> two sensor become similar.
> Do you think we can do thi test?
> Thanks in advance.
> Best regards,
>     Raffaella
> 
> Raffaella De Vita wrote:
>> Hi Amanda,
>> this is in general the behavior we were expecting. In terms of values, 
>> we were typically getting humidity of the order of 20% so I would say 
>> we are in the right range. We were not expecting to obtain different 
>> values from the two sensors but I'm not sure if we are yet using the 
>> right calibration curves. It is also possible that one of the two 
>> sensors (sensor 1) is closer to the nitrogen inlet and sense a dryer 
>> environment. I will try to verify this and get back to you asap.
>> Thanks a lot for helping us in this test.
>> Best regards,
>>    Raffaella
>> 
>> 
>> Amanda Hoebel wrote:
>>> Hi Raffaella,
>>> 
>>> The gas has been flowing for a little over 6 hours. The humidity 
>>> started at ~55% for both sensors and has been decreasing throughout 
>>> the day to ~10% for sensor 1 and ~26% for sensor 2. Are there certain 
>>> values you are expecting?
>>> 
>>> Regards,
>>> Amanda
>>> 
>>> ----- Original Message -----
>>> From: "raffaella devita" <Raffaella.Devita at ge.infn.it>
>>> To: "Amanda Hoebel" <amandah at jlab.org>, "dsg-ft" <dsg-ft at jlab.org>
>>> Sent: Wednesday, June 21, 2017 11:04:24 AM
>>> Subject: Re: [Dsg-ft] nitrogen purge and humidity
>>> 
>>> Thanks Amanda!
>>> Raffaella
>>> 
>>> Amanda Hoebel wrote:
>>>> Hi Raffaella,
>>>> 
>>>> We have started the gas flow and will monitor the humidity 
>>>> throughout the day.
>>>> 
>>>> Regards,
>>>> Amanda
>>>> 
>>>> ----- Original Message -----
>>>> From: "raffaella devita" <Raffaella.Devita at ge.infn.it>
>>>> To: "dsg-ft" <dsg-ft at jlab.org>
>>>> Sent: Wednesday, June 21, 2017 4:22:27 AM
>>>> Subject: [Dsg-ft] nitrogen purge and humidity
>>>> 
>>>> Dear All,
>>>> as of last week, we were authorized to restart using the FT-Cal 
>>>> nitrogen
>>>> purge from the bottle in the EEL building. We reconnected therefore the
>>>> bottle to the bubblers located under the calorimeter to ti inlet tube
>>>> and check that gas was flowing normally. Since we were leaving at the
>>>> end of last week we could not do much more while to further check the
>>>> system it would be useful to check that the humidity inside the
>>>> calorimeter, now monitored via the compact rio goes down while gas is
>>>> flowing. Could you help us doing this check. It would be sufficient to
>>>> start the gas flow, setting it to give a flow of ~  cm3/s ( few bubbles
>>>> per second in the glass bottle connected to the inlet line) and monitor
>>>> the humidity sensor output for let's say 6-10 hours.
>>>> Let us know if that is possible and if necessary we can provide more
>>>> information.
>>>> Thanks.
>>>> Best regards,
>>>>       Raffaella and Marco
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