Keith (Southend) wrote:

Houston, I think we have a problem!

I can't beleive the humidity is still 100% outside, but it's been stuck on it
since yesterday evening. Any ideas/solutions?

I had the opposite problem a few weeks ago. Over a period of a few days the RH
on my Vantage Pro 2 gradually drifted down to less than 5%. I solved the
problem by replacing the temp/RH sensor with one of the new 'enhanced' sensors
which are supposedly more accurate. It has all been working fine since then.

I'm not really sure what caused the problem but it developed shortly after a
spell of wet weather with very strong winds. It's possible that water getting
to the sensor was the problem but I'm only guessing.

--
Norman Lynagh
Tideswell, Derbyshire
303m a.s.l.
http://peakdistrictweather.org
@TideswellWeathr

On 31/12/2016 12:01, Norman Lynagh wrote:
Keith (Southend) wrote:

Houston, I think we have a problem!

I can't beleive the humidity is still 100% outside, but it's been stuck on it
since yesterday evening. Any ideas/solutions?

I had the opposite problem a few weeks ago. Over a period of a few days the RH
on my Vantage Pro 2 gradually drifted down to less than 5%. I solved the
problem by replacing the temp/RH sensor with one of the new 'enhanced' sensors
which are supposedly more accurate. It has all been working fine since then.

I'm not really sure what caused the problem but it developed shortly after a
spell of wet weather with very strong winds. It's possible that water getting
to the sensor was the problem but I'm only guessing.


MMmm, could do with the the sun coming out and a good drying wind as I
get the feeling dampness has got into the old WMII sensor. I feel like
taking the wife's hair dryer out there, um, better not thinking about it...

--
Keith (Southend)
"Weather Home & Abroad"
http://www.southendweather.net
Twitter:@SS9Weatherman

"Norman Lynagh" wrote in message ...

I solved the
problem by replacing the temp/RH sensor with one of the new 'enhanced'
sensors
which are supposedly more accurate. It has all been working fine since
then.

If anyone wants more detail on the *digital* T/H sensors in the Davis VP2
and Vue stations then a detailed description is included in the following
topic on the Davis knowledgebase that we maintain:

http://www.manula.com/manuals/pws/da...midity-general

NB1 This isn't really intended as light reading but the details are there if
you need them!

NB2 All pre-2006 Davis stations (ie WMII / VP1 / early VP2 models) used an
*analogue* T/H assembly which, sad to say, is no longer available from
Davis. Supplies were maintained well beyond the 5-year period which is Davis
policy for the continued availability of spares after the end of production
of particular models, but that stockpile is now totally exhausted.
Occasionally spares may turn up eg on eBay and similar sites.

John Dann
www.weatherstations.co.uk

On 31/12/2016 14:59, JohnD wrote:
"Norman Lynagh" wrote in message ...

I solved the
problem by replacing the temp/RH sensor with one of the new 'enhanced'
sensors
which are supposedly more accurate. It has all been working fine since
then.

If anyone wants more detail on the *digital* T/H sensors in the Davis
VP2 and Vue stations then a detailed description is included in the
following topic on the Davis knowledgebase that we maintain:

http://www.manula.com/manuals/pws/da...midity-general


NB1 This isn't really intended as light reading but the details are
there if you need them!

NB2 All pre-2006 Davis stations (ie WMII / VP1 / early VP2 models) used
an *analogue* T/H assembly which, sad to say, is no longer available
from Davis. Supplies were maintained well beyond the 5-year period which
is Davis policy for the continued availability of spares after the end
of production of particular models, but that stockpile is now totally
exhausted. Occasionally spares may turn up eg on eBay and similar sites.

John Dann
www.weatherstations.co.uk

Sounds like my options a
1. Forget about the hunidity/dew point
2. Get a new system
--
Keith (Southend)
"Weather Home & Abroad"
http://www.southendweather.net
Twitter:@SS9Weatherman

Keith (Southend) wrote:

On 31/12/2016 14:59, JohnD wrote:
"Norman Lynagh" wrote in message ...

I solved the
problem by replacing the temp/RH sensor with one of the new 'enhanced'
sensors
which are supposedly more accurate. It has all been working fine since
then.

If anyone wants more detail on the digital T/H sensors in the Davis
VP2 and Vue stations then a detailed description is included in the
following topic on the Davis knowledgebase that we maintain:

http://www.manula.com/manuals/pws/da...ure-humidity-g
eneral


NB1 This isn't really intended as light reading but the details are
there if you need them!

NB2 All pre-2006 Davis stations (ie WMII / VP1 / early VP2 models) used
an analogue T/H assembly which, sad to say, is no longer available
from Davis. Supplies were maintained well beyond the 5-year period which
is Davis policy for the continued availability of spares after the end
of production of particular models, but that stockpile is now totally
exhausted. Occasionally spares may turn up eg on eBay and similar sites.

John Dann
www.weatherstations.co.uk

Sounds like my options a
1. Forget about the hunidity/dew point
2. Get a new system

Weatherspares.co.uk are currently selling the pre-2006 analogue T/H sensors for
£65. They say the stock is very limited and when they're gone they're gone.
Might be worth a try, Keith.

--
Norman Lynagh
Tideswell, Derbyshire
303m a.s.l.
http://peakdistrictweather.org
@TideswellWeathr

On 31/12/2016 16:05, Norman Lynagh wrote:

Weatherspares.co.uk are currently selling the pre-2006 analogue T/H sensors for
£65. They say the stock is very limited and when they're gone they're gone.
Might be worth a try, Keith.


I'm struggling to find the page sensor in question for the WMII, is it
this one?
http://www.weatherspares.co.uk/repla...chip-342-p.asp

I'm sure it's linked, but external temperature seems ok.

Thanks Norman.
--
Keith (Southend)
"Weather Home & Abroad"
http://www.southendweather.net
Twitter:@SS9Weatherman

On 31/12/2016 17:04, Keith (Southend) wrote:
On 31/12/2016 16:05, Norman Lynagh wrote:

Weatherspares.co.uk are currently selling the pre-2006 analogue T/H
sensors for
£65. They say the stock is very limited and when they're gone they're
gone.
Might be worth a try, Keith.


I'm struggling to find the page sensor in question for the WMII, is it
this one?
http://www.weatherspares.co.uk/repla...chip-342-p.asp


I'm sure it's linked, but external temperature seems ok.

Thanks Norman.

Also never opened up the white box part inside the enclosure, is it a
soldering job changing this sensor?

--
Keith (Southend)
"Weather Home & Abroad"
http://www.southendweather.net
Twitter:@SS9Weatherman

On Saturday, 31 December 2016 17:07:05 UTC, Keith (Southend)G wrote:
I've just picked up a fault in the AE35 unit. It's going to go 100% failure in 72 hours.

Also never opened up the white box part inside the enclosure, is it a
soldering job changing this sensor?
“The thing’s hollow -- it goes on forever -- and er and and -- oh my God! -- it’s full of stars!�

Keith (Southend) wrote:

On 31/12/2016 16:05, Norman Lynagh wrote:

Weatherspares.co.uk are currently selling the pre-2006 analogue T/H sensors
for £65. They say the stock is very limited and when they're gone they're
gone. Might be worth a try, Keith.


I'm struggling to find the page sensor in question for the WMII, is it this
one?
http://www.weatherspares.co.uk/repla...rehumidity-sen
sor-chip-342-p.asp

I'm sure it's linked, but external temperature seems ok.

Thanks Norman.

Hi Keith,

No, it's this one (watch the line-wrap)


http://www.weatherspares.co.uk/davis...dity-analogue-
sensor-and-pre-2006-pro2-models-414-p.asp

--
Norman Lynagh
Tideswell, Derbyshire
303m a.s.l.
http://peakdistrictweather.org
@TideswellWeathr

"Norman Lynagh" wrote in message ...

Weatherspares.co.uk are currently selling the pre-2006 analogue T/H sensors
for
£65. They say the stock is very limited and when they're gone they're gone.
================================================== ============

That's fine for a pre-2006 VP2 and IIRC a VP1, but the WMII T/H sensor
assembly is a different item again I'm afraid. TBH I've never really looked
in detail, but it may be that the actual 2-pin humidity sensor element from
a VP1 board might fit in a WMII assembly. But even if that's the case
there's no guarantee that it will restore correct readings.

On a WMII, there's no obvious reason why the OAT shouldn't continue to work
OK even if the RH is faulty. But I'm guessing that the WMII is now some
12-15 years old and there comes a point where station renewal is the only
real option.