[dsg-svt] DSG work request

Tue Jul 17 11:37:55 EDT 2018

Yuri,

We have tested both flow meters, and noted inconsistencies in flow using 
multiple configurations. During testing this morning the "in" meter 
stopped working. We took the cover off and noted not only a moisture on 
the display cover, but standing water in the bottom of the enclosure.

The boards appear to be coated for moisture protection, however, the 
connector has evidence of corrosion which has eaten away the power 
connection. After further testing the meter still is operational, 
however the connector needs to be replaced in order for it to work. The 
power connection is corroded and broken at the level of the base of the 
connection, so repair will be difficult if at all possible.

That said, these meters are not designed to function where they can 
accumulate more moisture than the internal desiccant can absorb. The 
desiccant bags are completely saturated. While the pcbs are coated to 
prevent damage, the power/data contacts were only covered by heat 
shrink, _not potted to prevent actual moisture damage_. Additionally, 
the connector is positioned at the bottom of the enclosure and recessed, 
so it actually collects fluid.

When both meters were working the "in" meter measured "closer" to the 
manual rotameter than the "out" meter. We hooked up each meter 
individually, and in series. While in series, we noted that the "out" 
meter only recorded flow when it was the first meter in the series.

Rotameter gph (Lpm)
	Out (Lpm)
	In (Lpm)
10 (0.631)
	0.00
	0.96
14 (0.88)
	1.641
	1.638
16 (1.01)
	1.725
	1.654
18 (1.13)
	2.15
	1.804

Hall B Engineering and you should evaluate the setup and operation of 
the chiller to determine if this is the right equipment for that 
particular setup. If not, you should consult with Hall B engineering to 
select one that may be more appropriate. I will put the the meters back 
in the hall before lunch today.

Regards,

Marc

On 7/16/2018 9:10 AM, Peter Bonneau wrote:
>
> FYI:  The SVT flow meter was selected by Hall B engineering (see email 
> below).
>
> DSG placed the order for the meters as requested by Hall B engineering.
>
> Hall B engineering should select a meter that meets SVT requirements.
>
>
>
>
> -------- Forwarded Message --------
> Subject: 	Re: Flow Meter for SVT
> Date: 	Thu, 31 Jul 2014 14:44:09 -0400
> From: 	Saptarshi Mandal <mandal at jlab.org>
> To: 	Peter Bonneau <bonneau at jlab.org>
>
>
>
> Hi Peter,
>
> This one has bigger connections, so might be lesser pressure drop. Will
> this work for you ? FLR6302D should work for us.
>
> http://www.omega.com/pptst/FLR-D.html
>
> Saptarshi
>
> On 7/31/2014 1:13 PM, Peter Bonneau wrote:
> > Hi Saptarshi,
> >
> >
> > I know we've talked about this before, but it needs to be ordered now. 
>
> >
> > For an interface, we need a 0-5 V output.
> >
> >
> > Thanks,
> >
> > Peter
>
>
>
> On 7/13/2018 12:39 PM, Yuri Gotra wrote:
>>
>> Thank you Peter,
>>
>> A comment on your statement on the flow meters. The models and the 
>> number of the flow meters purchased (no spares) were defined by the 
>> HBI group. I reported several times that this model is not designed 
>> to work in magnetic field. The flow meters failed the very first time 
>> the solenoid was turned ON. Please select a model which would be 
>> compatible with requirements of the detector and let me and Bob 
>> Miller know.
>>
>>
>> On 7/13/18 11:56 AM, Peter Bonneau wrote:
>>>
>>> DSG comments regarding these work requests are in *blue.*
>>>
>>> On 7/13/2018 9:55 AM, Yuri Gotra wrote:
>>>> For testing the cooling system in preparation of the SVT for beam 
>>>> operations it is critical to have measurements of the coolant flow. 
>>>> Both flow meters observed issues with correct reading of the flow. 
>>>> The flow meters have been disconnected from the cooling lines 
>>>> (control lines are still connected). Please test the flow meters asap.
>>> DSG will schedule in this request in with all the other work in 
>>> Halls B, C, and D we are doing in preparation for the upcoming run.
>>> Hall B SVT does not have  cooling system repair components (external 
>>> to the chillers) which was first mentioned in our email of 1/31/2017 
>>> (listed below).
>>
>
>
>
> _______________________________________________
> dsg-svt mailing list
> dsg-svt at jlab.org
> https://mailman.jlab.org/mailman/listinfo/dsg-svt

-- 
Marc McMullen
Detector Support Group
757-269-7738

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