[Dsg-ft] nitrogen purge and humidity

[Raffaella De Vita]

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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