RE: Using 1 wire temp sensors on copper pipes?

[Paul Gale <groups2@xxxxxxxxxxxxxxxx>]

I know length of cable can affect these sensors - using Cat5, is it
advisable to connect 2 of the 3 pins over a twisted pair? i.e. data and
GND???

Paul.



> -----Original Message-----
> From: ukha_d@xxxxxxx [mailto:ukha_d@xxxxxxx] On Behalf
> Of Neil Ball
> Sent: 03 February 2009 12:34
> To: ukha_d@xxxxxxx
> Subject: RE: [ukha_d] Using 1 wire temp sensors on copper pipes?
>
> Well in that case I would suggest some Velcro strips to strap the
> Dallas
> sensors to the pipes - less likely to crush the sensor but should
still
> give
> good contact to the pipe.
>
> Neil B.
>
> -----Original Message-----
> From: ukha_d@xxxxxxx [mailto:ukha_d@xxxxxxx] On Behalf
> Of
> Paul Gale
> Sent: 03 February 2009 12:20
> To: 'ukha_d@xxxxxxx'
> Subject: RE: [ukha_d] Using 1 wire temp sensors on copper pipes?
>
> No, don't think so - do have HV Pro though that can cope with the
> Dallas
> sensors.
>
> Paul.
>
>
>
> > -----Original Message-----
> > From: ukha_d@xxxxxxx [mailto:ukha_d@xxxxxxx] On
> Behalf
> > Of Neil Ball
> > Sent: 03 February 2009 10:43
> > To: ukha_d@xxxxxxx
> > Subject: RE: [ukha_d] Using 1 wire temp sensors on copper pipes?
> >
> > Do any of you HA systems have inputs that can measure resistance?
If
> so
> > then
> > you can buy thermistor-based clamp-on sensors from Sontay and use
the
> > published look-up tables to convert from resistance to degrees C.
The
> > sensors have an enclosure with screw terminals for the cable
> > connection, 1m
> > of cable terminated with a brass strip (to which the thermistor
is
> > bonded)
> > that is clamped to the pipe with a jubilee clip. If you then put
pipe
> > insulation over the top of the sensor you will get reasonable
> accuracy.
> > These are the kind of sensors used in industrial/commercial BMS
> > installations so are quite robust.
> >
> > Neil B.
> >
> > -----Original Message-----
> > From: ukha_d@xxxxxxx [mailto:ukha_d@xxxxxxx] On
> Behalf
> > Of
> > Paul Gale
> > Sent: 03 February 2009 09:47
> > To: 'ukha_d@xxxxxxx'
> > Subject: [ukha_d] Using 1 wire temp sensors on copper pipes?
> >
> > With the talk of temp sensors, I was wondering if anyone has used
1
> > wire
> > temp sensors on copper DHW pipes? I need to measure (reasonably
> > accurately
> > to +-1 deg or so) the temperatures of my boiler feed and return
and
> > other
> > feed/returns on my thermal store system - mainly for tuning
purposes.
> >
> > I was wondering if these are the right devices to use (max
temp??)
> and
> > the
> > best way to bond them or temporarily fix them to the pipes? Was
> > thinking
> > maybe using epoxy resin such as araldite etc.
> >
> > Any thoughts?
> >
> > Paul.
> >
> >
> >
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