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Re: Optimum Temp/Humidity Ranges [Re: Lady Bird] #2772948
10/16/18 07:02 AM
10/16/18 07:02 AM
Joined: Nov 2013
Posts: 4,208
Southwestern Ontario
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prout Offline
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Joined: Nov 2013
Posts: 4,208
Southwestern Ontario
Originally Posted by Lady Bird
Prout do you want to swop that hygrometer for my magic hygrometer that Philip in China described so well ?
I’ll pass, but thanks for thinking of me.

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Re: Optimum Temp/Humidity Ranges [Re: oldMH] #2772994
10/16/18 10:06 AM
10/16/18 10:06 AM
Joined: Aug 2011
Posts: 5,654
Reseda, California
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JohnSprung Offline
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Reseda, California

Santa Ana winds are blowing these days, the TV weather says our humidity is as low as 4%. I got a static spark half an inch long when I went to open the car door this morning. Could static electricity be used to measure humidity, particularly the low end?


-- J.S.

[Linked Image] [Linked Image]

Knabe Grand # 10927
Yamaha CP33
Kawai FS690
Re: Optimum Temp/Humidity Ranges [Re: JohnSprung] #2773005
10/16/18 10:35 AM
10/16/18 10:35 AM
Joined: Nov 2013
Posts: 4,208
Southwestern Ontario
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prout Offline
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Southwestern Ontario
Originally Posted by JohnSprung

Santa Ana winds are blowing these days, the TV weather says our humidity is as low as 4%. I got a static spark half an inch long when I went to open the car door this morning. Could static electricity be used to measure humidity, particularly the low end?

Under very precisely controlled conditions, yes. At 10-20%RH walking across a carpet can generate in excess of 35,000 volts. At 60-90%RH, it would generate 1,500 volts. (ref. NIBA). The issue is actually measuring the charge without destroying the electronics doing the measuring.

Much easier and more accurate is to fill a polished metal test tube with ether and a calibrated mercury thermometer, blow air on the surface of the tube until dew forms, then read the thermometer. This is called the dewpoint. Compare it to another calibrated mercury thermometer nearby, but in the normal airstream. Consult the wet bulb/dry bulb chart and read the resulting relative humidity. I did this when I was nine years old, back in the days when a kid could buy ether and mercury thermometers from the local pharmacy!

Here’s a chart you can use.


[Linked Image]

Re: Optimum Temp/Humidity Ranges [Re: JohnSprung] #2773029
10/16/18 11:54 AM
10/16/18 11:54 AM
Joined: May 2005
Posts: 8,980
Phoenix, Arizona
Carey Offline
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Joined: May 2005
Posts: 8,980
Phoenix, Arizona
Originally Posted by JohnSprung

Santa Ana winds are blowing these days, the TV weather says our humidity is as low as 4%. I got a static spark half an inch long when I went to open the car door this morning. Could static electricity be used to measure humidity, particularly the low end?
Normally Arizona is the state with low humidity - but in Phoenix we've had over 7 inches of rain in the past three weeks (8 inches is our normal annual rainfall). The humidity has been quite high - which is a concern, since I have my tuner scheduled for next week. We usually wait to tune the piano until well after the monsoon season ends in September - but this year has been different. On the positive side, the outside temps have been 20 degrees cooler all month. Delightful !!


Mason and Hamlin BB - 91640
Kawai K-500 Upright
Kawai CA-65 Digital
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Re: Optimum Temp/Humidity Ranges [Re: oldMH] #2773071
10/16/18 02:02 PM
10/16/18 02:02 PM
Joined: Aug 2018
Posts: 531
North Vancouver
L
Lady Bird Online content
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Lady Bird  Online Content
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L

Joined: Aug 2018
Posts: 531
North Vancouver
Well the analog hygrometer inside my Sauter 130 has moved to 64 % The digital on the piano moves to about 64 later in the day but drops to 56 after the furnace has been on .,then gradually moves back up to 62,or about 64 .The Analog Hygrometer moves much slower however than the digital. Ulrich Sauter told us how to calibrate the analog .,quite tricky to jiggle the needle up to 100%

Re: Optimum Temp/Humidity Ranges [Re: oldMH] #2773211
10/16/18 09:51 PM
10/16/18 09:51 PM
Joined: Aug 2018
Posts: 531
North Vancouver
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Lady Bird Online content
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Lady Bird  Online Content
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Joined: Aug 2018
Posts: 531
North Vancouver
Can anyone tell me why my technician from the dealer I bought the piano from would say 70% even 80% is OK for my new piano?

Last edited by Lady Bird; 10/16/18 09:52 PM.
Re: Optimum Temp/Humidity Ranges [Re: oldMH] #2773226
10/17/18 12:08 AM
10/17/18 12:08 AM
Joined: May 2018
Posts: 240
North of Los Angeles
L
Learux Online content
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Learux  Online Content
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Joined: May 2018
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North of Los Angeles
Probably because they want to sell you a new piano.



Casio GP-400
Schimmel SP-182T
Re: Optimum Temp/Humidity Ranges [Re: oldMH] #2773228
10/17/18 12:34 AM
10/17/18 12:34 AM
Joined: Aug 2018
Posts: 531
North Vancouver
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Lady Bird Online content
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Lady Bird  Online Content
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L

Joined: Aug 2018
Posts: 531
North Vancouver
The technician seems too nice as a person to do that .

Re: Optimum Temp/Humidity Ranges [Re: oldMH] #2773303
10/17/18 09:54 AM
10/17/18 09:54 AM
Joined: Aug 2011
Posts: 5,654
Reseda, California
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JohnSprung Offline
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Reseda, California

As long as the piano is acclimated and regulated for it, a non-condensing consistent 70 - 80% should be OK. Domestic market Japanese pianos seem to do fine in their stable but humid climate.


-- J.S.

[Linked Image] [Linked Image]

Knabe Grand # 10927
Yamaha CP33
Kawai FS690
Re: Optimum Temp/Humidity Ranges [Re: oldMH] #2773328
10/17/18 11:25 AM
10/17/18 11:25 AM
Joined: Aug 2018
Posts: 531
North Vancouver
L
Lady Bird Online content
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Lady Bird  Online Content
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L

Joined: Aug 2018
Posts: 531
North Vancouver
This is a Sauter 130 German piano .Álthough it did go into the 70,s for a number of weeks in the earlier Autumn. ,it has now been hanging around 64 %.This is measured by a digital hygrometer. I have been taking notes from last winter when I started my piano search an know it could drop to 43% or 45%,perhaps lower .So these ranges are scary.I have had the piano only a few months .So I am puzzled why a technician with such a good reputation would make such statements ?Could someone help ?

Re: Optimum Temp/Humidity Ranges [Re: oldMH] #2773368
10/17/18 02:04 PM
10/17/18 02:04 PM
Joined: May 2018
Posts: 240
North of Los Angeles
L
Learux Online content
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Learux  Online Content
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Joined: May 2018
Posts: 240
North of Los Angeles
Currently dealing with the Santa Ana's, Bone dry outside(15%RH). Bought a humidifier(not just for the piano, also for the family) averaging the measurements of 4 hygrometers.


It has no problem humidifying part of the the house. It is positioned on the second. The first floor is getting enough to bring the humidity up to 45% no problem


Got it yesterday, so far I am impressed.



Casio GP-400
Schimmel SP-182T
Re: Optimum Temp/Humidity Ranges [Re: Learux] #2773437
10/17/18 07:16 PM
10/17/18 07:16 PM
Joined: Aug 2011
Posts: 5,654
Reseda, California
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JohnSprung Offline
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Joined: Aug 2011
Posts: 5,654
Reseda, California
Originally Posted by Learux
Currently dealing with the Santa Ana's, Bone dry outside(15%RH). Bought a humidifier to bring the humidity up to 45% no problem

Got it yesterday, so far I am impressed.


Good to know, what make and model, where'd you get it? I'm in Reseda, might want to get one, too.


Thanks --



-- J.S.


-- J.S.

[Linked Image] [Linked Image]

Knabe Grand # 10927
Yamaha CP33
Kawai FS690
Re: Optimum Temp/Humidity Ranges [Re: oldMH] #2773448
10/17/18 08:17 PM
10/17/18 08:17 PM
Joined: May 2018
Posts: 240
North of Los Angeles
L
Learux Online content
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Joined: May 2018
Posts: 240
North of Los Angeles
This is the one, it is fairly ugly but does the job well.

https://www.amazon.com/gp/product/B004S34ISA/ref=oh_aui_detailpage_o01_s00?ie=UTF8&psc=1


If the link expires it is a


Essick Air Aircare MA1201 Whole-House Console-Style Evaporative Humidifier, White

There is also a smaller model.

Last edited by Learux; 10/17/18 08:19 PM.


Casio GP-400
Schimmel SP-182T
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