What is minimum temperature?

In ,
1vojage typed:
The most important is Nonoperating temperature, for example below
-20œC We can assume that due transportation issues and temporary storage
in
postal warehouse, a laptop could easily drop below -20œC
How long time its allowed to store it below -20œC?

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"Paul" wrote in message
...
1vojage wrote:
What is minimum temperature for safe transportation and temporary
storage of laptops in winter season?
For example, when sending laptop by usps post in winter season.
What is safe temperature for sensitive electronic parts, sensitive
display? The frost can damage electronics.

Find the specification section of the manuals that came with the
laptop. For example, this is for an HP DV9000 laptop.

Temperature

Operating* 5œC to 35œC
Nonoperating -20œC to 60œC

Relative humidity (noncondensing)

Operating 10% to 90%
Nonoperating 5% to 95%, 38.7œC (101.6œF) maximum wet bulb
temperature Maximum altitude (unpressurized)

Operating (14.7 to 10.1 psia) -15 m to 3,048 m
Nonoperating (14.7 to 4.4 psia) -15 m to 12,192 m

The altitude spec, is based on the ability of the hard drive
flying height to be maintained when the air is thin. When the
computer is not operating, a much higher altitude can be allowed.

Operating temperature is limited by the point at which,
mechanical damage could happen due to differences in
temperature coefficients. I don't know which component
in the computer causes the -20œC limit. It could be the
LCD panel for example. (I just looked up data I have for
a NEC LCD panel, and it spans -20œC to 60œC.)

When the laptop is delivered at its destination, if it has
been exposed to -20œC conditions, it should be allowed to
acclimate in your room, for 12 to 24 hours. I would not
switch on the laptop immediately after Fedex delivers it,
as the hard drive could have condensation inside on the
platters. Better to leave the laptop for a period of
time, to allow things to slowly warm up. Hard drives have
a breather hole, and the breather hole filter doesn't
remove everything.

Shipping conditions could easily exceed those limits.
My sister lives in a remote location, and the temperature
there is below -30œC in the winter. Transportation vehicles
have a long long drive from the city, and a laptop could
easily drop below -20œC in the back of the truck. Our transports
here are not heated, when it comes to parcel delivery.

Paul

Assuming this is a DIY shipment and not something for which the mfg is
responsible:


-20C = -4F
-30C = -22F
-40C = -40F A convenient convergence to remember for doing estimations.
Those numbers are "minimum" so to speak, meaning "at least" -20C, -40, etc..
But never count on that as a saving piece of informaiton.

There is NO one size fits all answer to this question, unfortunately:
With the exception of batteries (UPS and CMOS which have their own specs),
the major compoments of a computer are often rated for -40C/F
non-operating/storage temperatures. For accurate information though, the
only thing you can do is check with the manufacturer and get their numbers
for your model.
After getting the mfg specs, then you also have to do the same for any
peripherals you've added to the machine, including hard drives, cards, etc..

Take UPS and FEDEX for example:
-- Vans are parked inside overnight where it's not excessively cold.
-- Vans are heated, minimally, by leakage from the driver's area and I've
seen heat vents in the back/sides, around the doors.
-- All bets are off if the item ends up in a semi; those are outside,
delivery trailers are never heated/cooled and due to the vibrations etc.,
are the most destructive. Aircraft baggage areas are just as bad or worse.
-- Overnight or 2nd day deliveries are generally the best for temperature
sensitive items.

UPS, FedEx and USPS Priority are also good sources to ask. Have your
zipcodes handy. They're used to handling electronic equipment.

It's not a huge job to pick a point in the weather patterns (though not
foolproof) when the temperatures will not be going sub-zero. Packaging of
course is important, too; you want it almost air-sealed so no drafts run
around the item being shipped. In a draft free environment it takes many
hours for a packages contents to equalize to the ambient temperature.
Likewise for heating back up at the destination - open such packages
promptly and let them begin to acclimate and dissipate any moisture that may
have formed due to the temperature changes. e.g. right now and the rest of
this week our local temps are lows of right around 0 F and will remain so
for about the next week. Then there should be a warming trend: If I were
shipping i'd wait and see what next week's forecast was when the time
actually arrived. If it's above 0F I'd ship. Also considering the weather
in between, of course. If the package had to route through, say, Billings or
the Cinci area, I'd probably hold off until Feb or March to send it.

To the best of my knowledge anyway,

Twayne`


--
--
Live in the moment;
be open to the possibilities
that life has to offer.

In ,
1vojage typed:
OK, the laptop itself and AC adapter has temperature ratings (-40C),
that's Ok
For the battery (-20C): what if battery will be affected by low
temperature below (-20C) say, during 1-2 days: does this can damage
battery permanently, or just make the battery unstable, and the life
of the battery may be shortened?
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"Paul" wrote in message
...
1vojage wrote:
The most important is Nonoperating temperature, for example below
-20œC We can assume that due transportation issues and temporary
storage in postal warehouse, a laptop could easily drop below -20œC
How long time its allowed to store it below -20œC?


If the spec says something like this:

Temperature

Operating* 5œC to 35œC
Nonoperating -20œC to 60œC

it means you should not allow the product to go below -20œC at all,
ever. They cannot guarantee what will happen if you do so. It may
be damaged, or it may not. All they're willing to guarantee,
is that the product should be fault-free, if stored at a
temperature as low as -20œC. But not lower.

If the product is covered under warranty, you always have the
alternative of returning it for repair.

It is possible that the element with the -20œC limit is the
battery. Apparently, if you plan on shipping it and storing
at a low temperature, the optimal battery charge state is
40%. In other words, when the computer is shipped, the
lithium battery should not be fully charged.

Paul

If this is a shipment from a place like Dell, then it's THEIR responsibility
to get it to you fault-free. Otherwise you have a warranty claim. Trust
them; they know a hell of a lot more than you do about it, or anyone else
here.
The min temp for batteries is variable from mfg to mfg and type to type
and material to material and amount of charge. The source would likely be
the only one to give you a useful answer.

Twayne



--
--
Live in the moment;
be open to the possibilities
that life has to offer.

In ,
Bob I typed:
Ask the manufacturer. It doesn't matter to Windows XP.

1vojage wrote:

What is minimum temperature for safe transportation and temporary
storage of laptops in winter season?
For example, when sending laptop by usps post in winter season. What
is safe temperature for sensitive electronic parts, sensitive
display? The frost can damage electronics.

Absolutely!
--
Live in the moment;
be open to the possibilities
that life has to offer.

On Fri, 18 Dec 2009 18:07:34 -0500, "Twayne"
wrote:

That's silly, since they will have to do a warranty action for each failure


Changed the address that your messages come from? A typical thing that
trolls like you do, to escape from my (and the many others your
address was in) killfile.

But no problem. We can add your new addresses to our killfiles just as
quickly as you can change the address you post from.

--
Ken Blake, Microsoft MVP (Windows Desktop Experience) since 2003
Please Reply to the Newsgroup

On Fri, 18 Dec 2009 13:37:00 -0500, Paul wrote:

Bill Sharpe wrote:
1vojage wrote:
What is minimum temperature for safe transportation and temporary
storage of laptops in winter season?
For example, when sending laptop by usps post in winter season. What
is safe temperature for sensitive electronic parts, sensitive display?
The frost can damage electronics.

-20 C is pretty darn cold. I wouldn't worry about temperature problems
when shipping the laptop.

Bill

It was -22C here last night.

And further west in our country, here is a temperature reading from a
few days ago.

http://www.cbc.ca/canada/calgary/sto...d-weather.html

"Edmonton International Airport was the coldest place in Canada," Peter Spyker,
a meteorologist with Environment Canada, said Sunday. "It was -46.1 [Celsius]
without the wind chill."

That probably wouldn't do your batteries any good.

This is why they don't have computers in western Canda. No way to get
them there.

Paul

mm wrote:
On Fri, 18 Dec 2009 13:37:00 -0500, Paul wrote:

Bill Sharpe wrote:
1vojage wrote:
What is minimum temperature for safe transportation and temporary
storage of laptops in winter season?
For example, when sending laptop by usps post in winter season. What
is safe temperature for sensitive electronic parts, sensitive display?
The frost can damage electronics.
-20 C is pretty darn cold. I wouldn't worry about temperature problems
when shipping the laptop.

Bill
It was -22C here last night.

And further west in our country, here is a temperature reading from a
few days ago.

http://www.cbc.ca/canada/calgary/sto...d-weather.html

"Edmonton International Airport was the coldest place in Canada," Peter Spyker,
a meteorologist with Environment Canada, said Sunday. "It was -46.1 [Celsius]
without the wind chill."

That probably wouldn't do your batteries any good.

This is why they don't have computers in western Canda. No way to get
them there.
Paul


They have Chinooks there or warm winds. You just pick a day to ship,
when it is balmy and above zero C :-) They're not punished with -46.1
all the time. There are other areas though, that don't benefit from
the Chinook, and consistent -20C or lower is possible. You might see
that around the third or fourth week of January. So we're a month away
from the coldest weather.

http://en.wikipedia.org/wiki/Chinook_wind

Paul

Paul wrote:
Bill Sharpe wrote:
1vojage wrote:
What is minimum temperature for safe transportation and temporary
storage of laptops in winter season?
For example, when sending laptop by usps post in winter season. What
is safe temperature for sensitive electronic parts, sensitive display?
The frost can damage electronics.

-20 C is pretty darn cold. I wouldn't worry about temperature problems
when shipping the laptop.

Bill

It was -22C here last night.

And further west in our country, here is a temperature reading from a
few days ago.

http://www.cbc.ca/canada/calgary/sto...d-weather.html


"Edmonton International Airport was the coldest place in Canada,"
Peter Spyker,
a meteorologist with Environment Canada, said Sunday. "It was -46.1
[Celsius]
without the wind chill."

That probably wouldn't do your batteries any good.

Paul

When I said that -20C was pretty darn cold, you have to realize that I
live in Southern California, where we typically have 70 degree F
temperatures even in the winter.

Bill Sharpe wrote:


When I said that -20C was pretty darn cold, you have to realize that I
live in Southern California, where we typically have 70 degree F
temperatures even in the winter.

You Californians have a sense of humor. I visited there once in the
winter, and it was around 70F. I went to the beach (it was the weekend
and I had time on my hands). There were Californians at the beach - some
riding horses, some on ATVs, a few on foot. They were wearing heavy
sweaters and jeans, as if it was cold. I, on the other hand, thought
it was summer, because it was so warm. I was wearing shorts and a
T-shirt, and everyone was looking at me like I was from Mars :-)
Good times...

Paul

Per Paul:
You Californians have a sense of humor. I visited there once in the
winter, and it was around 70F. I went to the beach (it was the weekend
and I had time on my hands). There were Californians at the beach - some
riding horses, some on ATVs, a few on foot. They were wearing heavy
sweaters and jeans, as if it was cold. I, on the other hand, thought
it was summer, because it was so warm. I was wearing shorts and a
T-shirt, and everyone was looking at me like I was from Mars :-)
Good times...

When I was living in Hawaii, one December evening I was sitting
in this Waikiki tourist trap called "The International
Marketplace" - wearing a long sleeve button-up sweater and
freezing my bony butt off.

This tourist from someplace like Broken Pelvis, Montana sat down
next to me and I guess he felt a need to say something... so he
said "Sure is hot an muggy here."
--
PeteCresswell