Re: Flow switches

[Neil Fuller <neil.fuller@xxxxxxxxx>]

Paul

Yes, the cheap plastic ones from CPC will do the job but they tend to
get a bit fragile after prolonged exposure to high temperatures.

Call me old fashioned but I'd always go for the brass
"industrial"
version over a PVC unit.

Good point re the Hum sensors.

Most are approx +/- 10% although you can get 2% versions which are about
£160!

They also need regular calibration.

I wouldn't be too bothered about them coming on during the day if the
hum rises because they would be doing their job and you can always
disable them for the night time.

Cheers

Neil

Paul Gale wrote:
> I've fitted flow switches to all of my shower hot water feeds (4 of
them) - have yet to program them up in HomeVision yet though. HV will
control my extract fans via CBus.
>
> I did have a humidity sensor but never fitted it - I was thinking it
would need some careful calibration and monitoring over a year or so, so
that it wouldn't come on at odd times of day/night depending on the ambient
humidity.
>
> I think running the fan on a timer, initiated by the start/stop flow
of hot water should be a good solution.
>
> I bought my (cheaper) flow switches from CPC:
>
> http://cpc.farnell.com/jsp/search/productdetail.jsp?SKU=SN35601
>
> I found there were some very expensive switches around.
>
> Paul.
>
>
>
>
>> -----Original Message-----
>> From: ukha_d@xxxxxxx [mailto:ukha_d@xxxxxxx] On Behalf
>> Of Neil Fuller
>> Sent: 18 November 2008 19:41
>> To: ukha_d@xxxxxxx
>> Subject: Re: [ukha_d] Flow switches
>>
>> John
>>
>> One of these would work
>>
>> http://www.pvl.co.uk/datafaxes/2134%20-%20Shower%20flow%20switch.pdf
>>
>> There's loads more on the market - Just google for Shower Flow
Switch
>>
>> You could start the fan on water flow then wait until the extract
>> humidity has dropped below a threshold to turn the fan off using
one of
>> these;
>>
>> http://www.sensorsandtransmitters.com/products/5/by_type
>>
>> I think it's a far better idea than hum controlled fans which have
a
>> habit of turning on whenever the light is on and then running on
when
>> the light goes of until the hum drops (if the hum is low, it will
go
>> off
>> as soon as the light goes off). All too noisy at night time!
>>
>> Cheers
>>
>> Neil
>>
>> John B wrote:
>>
>>> Hi all,
>>>
>>> I'm currently remodelling the bathroom, and naturally adding
as much
>>> HA as possible :-)
>>>
>>> I'm trying to automate the operation of the extractor fan, and
was
>>> looking at fitting a flow switch to the shower's water supply
to
>>> control the fan.
>>> (i.e. shower is switched on, fan switches on, shower switches
off,
>>>
>> fan
>>
>>> runs for an overrun period then switches off)
>>>
>>> Has anyone done something similar? Or can anyone recommend a
decent
>>> flow switch?
>>> I have some spare inputs on Comfort that I'm guessing I can
use for
>>> the flow switch, and the fan is on a C-Bus relay channel so it
>>> shouldn't be a problem controlling it from Comfort.
>>>
>>> Ta for any help!
>>>
>>> John
>>>
>>>
>>>
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