Davis humidity stuck at 100%
 

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

Davis humidity stuck at 100%
 

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...e-humidity-gen
eral

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


That's an interesting article, John. I hadn't realised it was all so
complicated. I recently bought the 7346.174 version to replace my faulty one.
I'm very happy with the replacement. Fitting it was no great problem though it
is useful to have a second person to hold the 'pile of plates' when the
temperature screen is dismantled. I also took the opportunity to give the whole
thing a good clean.


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

Davis humidity stuck at 100%
 

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

Davis humidity stuck at 100%
 

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

Davis humidity stuck at 100%
 

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?


Humidity here has been = 98% for the last 5 days. Maybe it's right? Check
around nearby stations.


--
Brian Wakem
Lower Bourne, Farnham, Surrey
http://www.brianwakem.co.uk/weather
Live obs @ 17:11:34 : 5.5C, DP 5.5C, RH 100%, 0.0 mm

Davis humidity stuck at 100%
 

"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.

Davis humidity stuck at 100%
 

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

Davis humidity stuck at 100%
 

JohnD wrote:

"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.

Ah, yes. I see what you mean, John. Sorry, Keith, I seem to have been leading
you up a blind alley :-(

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

Davis humidity stuck at 100%
 

On 31/12/2016 17:33, Norman Lynagh wrote:
JohnD wrote:

"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.

Ah, yes. I see what you mean, John. Sorry, Keith, I seem to have been leading
you up a blind alley :-(


No worries Norman, my WMII the first data on my logger is 20:30 15/10/99
so that's over 17 years now! That Steam Train has been heading for a
cliff for some time now, I think living in the soft SE has meant that it
doesn't get as *weatherered* as some of you up north ;-)

It may be time to think seriously about my options in 2017.

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

Davis humidity stuck at 100%
 

On Sat, 31 Dec 2016 14:33:49 +0000, "Keith (Southend)"
wrote:

Oh S&^t.

The temperature sensor will continue to work and, from memory, it's
relatively easy to modify the software to eliminate the humidity
readings and displays - I think.

--
Alan White
Mozilla Firefox and Forte Agent.
By Loch Long, twenty-eight miles NW of Glasgow, Scotland.
Webcam and weather:- http://windycroft.co.uk/weather