Years ago, there were countdown timeswitches, a bit like a kitchen
pinger timer, which you wound up to as many hours as you wanted and
the appliance was then on for that time (immersion heater was a
typical appliance). Looking for something similar for someone.
Needs to go up to 8 hours (or near). I can find ones that do 45
minutes, but not 8 hours. Anyone seen one?

--
Andrew Gabriel
[email address is not usable -- followup in the newsgroup]

"Andrew Gabriel" wrote in message
...
Years ago, there were countdown timeswitches, a bit like a kitchen
pinger timer, which you wound up to as many hours as you wanted and
the appliance was then on for that time (immersion heater was a
typical appliance). Looking for something similar for someone.
Needs to go up to 8 hours (or near). I can find ones that do 45
minutes, but not 8 hours. Anyone seen one?

--
Andrew Gabriel
[email address is not usable -- followup in the newsgroup]

This one has a count down, but not sure how loong for - do you have a local
Screwfix where you can go and look at one?

http://www.screwfix.com/prods/50180

On 26 Nov 2008 13:17:57 GMT someone who may be
(Andrew Gabriel) wrote this:-

Needs to go up to 8 hours (or near). I can find ones that do 45
minutes, but not 8 hours. Anyone seen one?

Not up to 8 hours. Horstmann, do ones that go up to ISTR 4 hours
(can't be bothered to check) and may do longer runs.

The few old fashioned ones I have seen went for an hour or two, not
eight hours.


--
David Hansen, Edinburgh
I will *always* explain revoked encryption keys, unless RIP prevents me
http://www.opsi.gov.uk/acts/acts2000/00023--e.htm#54

"Andrew Gabriel" wrote in message
...
Years ago, there were countdown timeswitches, a bit like a kitchen
pinger timer, which you wound up to as many hours as you wanted and
the appliance was then on for that time (immersion heater was a
typical appliance). Looking for something similar for someone.
Needs to go up to 8 hours (or near). I can find ones that do 45
minutes, but not 8 hours. Anyone seen one?

--
Andrew Gabriel
[email address is not usable -- followup in the newsgroup]

Have a look on here;
http://www.tradesman.co.uk/electrical/index.html?lang=en-uk&target=d136.html

Don.

"Don" wrote in message
. uk...

"Andrew Gabriel" wrote in message
...
Years ago, there were countdown timeswitches, a bit like a kitchen
pinger timer, which you wound up to as many hours as you wanted and
the appliance was then on for that time (immersion heater was a
typical appliance). Looking for something similar for someone.
Needs to go up to 8 hours (or near). I can find ones that do 45
minutes, but not 8 hours. Anyone seen one?

--
Andrew Gabriel
[email address is not usable -- followup in the newsgroup]

Have a look on here;
http://www.tradesman.co.uk/electrical/index.html?lang=en-uk&target=d136.html

I should have said, the D21 has removable tappets so you can set it to
whatever you want.

Don.

In article ,
Andrew Gabriel wrote:
Years ago, there were countdown timeswitches, a bit like a kitchen
pinger timer, which you wound up to as many hours as you wanted and
the appliance was then on for that time (immersion heater was a
typical appliance). Looking for something similar for someone.
Needs to go up to 8 hours (or near). I can find ones that do 45
minutes, but not 8 hours. Anyone seen one?

Dunno about commercial ones. But the ol' U6047 chip was ideal for this -
basically designed for car heated rear window timing. Could be triggered
in a variety of ways including at power on, wide range from 4 sec to 20
hours, and could drive a meaty relay directly.

It's obsolete but I have some left. There's probably a near equivalent.

--
*When a clock is hungry it goes back four seconds*

Dave Plowman London SW
To e-mail, change noise into sound.

In article ,
"Dave Plowman (News)" writes:

Dunno about commercial ones. But the ol' U6047 chip was ideal for this -
basically designed for car heated rear window timing. Could be triggered
in a variety of ways including at power on, wide range from 4 sec to 20
hours, and could drive a meaty relay directly.

It's obsolete but I have some left. There's probably a near equivalent.

That looks very useful.

It's still available from Digikey for £2475 for 4000 of them ;-)

--
Andrew Gabriel
[email address is not usable -- followup in the newsgroup]

In article ,
Andrew Gabriel wrote:
In article ,
"Dave Plowman (News)" writes:

Dunno about commercial ones. But the ol' U6047 chip was ideal for this
- basically designed for car heated rear window timing. Could be
triggered in a variety of ways including at power on, wide range from
4 sec to 20 hours, and could drive a meaty relay directly.

It's obsolete but I have some left. There's probably a near equivalent.

That looks very useful.

Very - it also has the ability to toggle on and off, so useful for other
things as well as a timer.

It's still available from Digikey for £2475 for 4000 of them ;-)

Well I could do with some more. ;-)

--
*I don't work here. I'm a consultant

Dave Plowman London SW
To e-mail, change noise into sound.

On 26 Nov, 13:17, (Andrew Gabriel) wrote:
Years ago, there were countdown timeswitches, a bit like a kitchen
pinger timer, which you wound up to as many hours as you wanted and
the appliance was then on for that time (immersion heater was a
typical appliance). Looking for something similar for someone.
Needs to go up to 8 hours (or near). I can find ones that do 45
minutes, but not 8 hours. Anyone seen one?

--
Andrew Gabriel
[email address is not usable -- followup in the newsgroup]

Screwfix have complex digital plug in timers on offer at the moment
for £2.49 which seem to have a 99 hour count down - at least I've just
taken one up to 30 hours. Don't know if they are on the website but
they are in the Edinburgh shop.

Rob

On 26 Nov, 14:25, robgraham wrote:
On 26 Nov, 13:17, (Andrew Gabriel) wrote:

Years ago, there were countdown timeswitches, a bit like a kitchen
pinger timer, which you wound up to as many hours as you wanted and
the appliance was then on for that time (immersion heater was a
typical appliance). Looking for something similar for someone.
Needs to go up to 8 hours (or near). I can find ones that do 45
minutes, but not 8 hours. Anyone seen one?

--
Andrew Gabriel
[email address is not usable -- followup in the newsgroup]

Screwfix have complex digital plug in timers on offer at the moment
for £2.49 which seem to have a 99 hour count down - at least I've just
taken one up to 30 hours. *Don't know if they are on the website but
they are in the Edinburgh shop.

Rob

Having given the key info, I'm now going to hijack the thread ans ask
a similar question about digital timers.

We have an old one that is becoming unreliable on the battery
contacts; it's main asset is that unlike everyone I have seen since,
it reverts automatically to program if you switch it to manual - ie
you just press the ON button and it will then go OFF at the set
automatic time. This is a great boon for the bed electric blanket if
you want to go to bed early. All current ones I've checked just stay
ON once switched there.

Rob

We have an old one that is becoming unreliable on the battery
contacts; it's main asset is that unlike everyone I have seen since,
it reverts automatically to program if you switch it to manual - ie
you just press the ON button and it will then go OFF at the set
automatic time. This is a great boon for the bed electric blanket if
you want to go to bed early. All current ones I've checked just stay
ON once switched there.

I have a couple of Micromark MM9539 plug-in timers which behave as you
wish. They appear to have been succeeded by the MM9578 which look the
same and have the same specification. I cannot vouch for them behaving
in the same way as regards manual override but you might be able to find
online a user manual.
--
Robin

"Andrew Gabriel" wrote in message
...
Years ago, there were countdown timeswitches, a bit like a kitchen
pinger timer, which you wound up to as many hours as you wanted and
the appliance was then on for that time (immersion heater was a
typical appliance). Looking for something similar for someone.
Needs to go up to 8 hours (or near). I can find ones that do 45
minutes, but not 8 hours. Anyone seen one?

--
Andrew Gabriel
[email address is not usable -- followup in the newsgroup]


Our old tumble drier has something like that. You wind it up, and then when
power is applied to the tumble drier it starts counting down.
This was compatible with an external time switch which just allowed the
tumble drier to run at off peak periods.

The timer on the tumble drier as broken, and I can't get a replacement. All
the modern tumble driers have a start button and are thus incompatible with
an external time switch, though some driers do have a delay start.


--
Michael Chare

On 26 Nov 2008 13:17:57 GMT, Andrew Gabriel wrote:

Years ago, there were countdown timeswitches, a bit like a kitchen
pinger timer, which you wound up to as many hours as you wanted and
the appliance was then on for that time (immersion heater was a
typical appliance). Looking for something similar for someone.

Does it have to be mechancical with user variable amount of ON?

--
Cheers
Dave.

In article et,
"Dave Liquorice" writes:
On 26 Nov 2008 13:17:57 GMT, Andrew Gabriel wrote:

Years ago, there were countdown timeswitches, a bit like a kitchen
pinger timer, which you wound up to as many hours as you wanted and
the appliance was then on for that time (immersion heater was a
typical appliance). Looking for something similar for someone.

Does it have to be mechancical

No

with user variable amount of ON?

Yes, but doesn't need high resolution (1 hour would do,
half hour would be better).

--
Andrew Gabriel
[email address is not usable -- followup in the newsgroup]

On 26 Nov 2008 15:45:03 GMT, Andrew Gabriel wrote:

with user variable amount of ON?

Yes, but doesn't need high resolution (1 hour would do, half hour would
be better).

I guess it also needs to be "user friendly" not a couple of tiny tweaky
switches on the front of a 1 unit wide DIN module then, they come in all
manner of variations.

Maybe one has a simple external method of altering the triggered period?
Like an ordinary pot but is there requirement for feedback to the user of
how long is left to run whicg a pot wouldn't do? Requirement to cancel
early could be met with an "off" button next to the "on" one.

--
Cheers
Dave.

In article et,
"Dave Liquorice" writes:
On 26 Nov 2008 15:45:03 GMT, Andrew Gabriel wrote:

with user variable amount of ON?

Yes, but doesn't need high resolution (1 hour would do, half hour would
be better).

I guess it also needs to be "user friendly" not a couple of tiny tweaky
switches on the front of a 1 unit wide DIN module then, they come in all
manner of variations.

Actually, that would probably be OK, providing it's simple
(such as press a button once for each 30 minute period you
want). There's already a complex way to do it -- looking for
something simpler.

Maybe one has a simple external method of altering the triggered period?
Like an ordinary pot but is there requirement for feedback to the user of
how long is left to run whicg a pot wouldn't do? Requirement to cancel
early could be met with an "off" button next to the "on" one.

Yes. Dave's rear heater IC would do the job nicely, if it
was still available in quantities 4000.

--
Andrew Gabriel
[email address is not usable -- followup in the newsgroup]

I think the old ZN1034 precision timer chip was good for this sort of
thing. Not sure if it's still available, but may be worth a look.

J^n

On 26 Nov 2008 18:38:06 GMT, Andrew Gabriel wrote:

I guess it also needs to be "user friendly" not a couple of tiny tweaky
switches on the front of a 1 unit wide DIN module then, they come in
all manner of variations.

Actually, that would probably be OK, providing it's simple (such as
press a button once for each 30 minute period you want)

You'd presumably need feedback so you know what it set it to. Starts
getting complicated...

Someone mentioned a time switch and setting an off peg. I have that, a
modified motorised plugin timer with the live feed to the motor taken
after the switch so it stops when it switches off. Just rotate the dial to
the required position and of it goes for that period of time. Remark the
scale and you have 15m to 23h 45m easyly settable.

--
Cheers
Dave.

Andrew Gabriel wrote:
Years ago, there were countdown timeswitches, a bit like a kitchen
pinger timer, which you wound up to as many hours as you wanted and
the appliance was then on for that time (immersion heater was a
typical appliance). Looking for something similar for someone.
Needs to go up to 8 hours (or near). I can find ones that do 45
minutes, but not 8 hours. Anyone seen one?


Take an ordinary rotary 24hr timer, put an 'off' pin in it, and remark
the dial hours to count down to the off pin instead of counting up.


NT

On 26 Nov, 13:17, (Andrew Gabriel) wrote:
Years ago, there were countdown timeswitches, a bit like a kitchen
pinger timer, which you wound up to as many hours as you wanted and
the appliance was then on for that time (immersion heater was a
typical appliance). Looking for something similar for someone.

TLC do them as immersion heater timers. Up to 1 hour or 2 hours, but
not 8.

RS (and anywhere industrial, maybe even TLC) have them, but it's rack-
mount and you'll need to box it, and possibly add a contactor for the
current.

"Andrew Gabriel" wrote in message
...
Years ago, there were countdown timeswitches, a bit like a kitchen
pinger timer, which you wound up to as many hours as you wanted and
the appliance was then on for that time (immersion heater was a
typical appliance). Looking for something similar for someone.
Needs to go up to 8 hours (or near). I can find ones that do 45
minutes, but not 8 hours. Anyone seen one?

Andrew Gabriel


Look for two brand names Intermatic and Leviton. They specialise in all
sorts of timed control and timed switching products. They have websites, so
you should fine them ok.

In article ,
(Andrew Gabriel) writes:
Years ago, there were countdown timeswitches, a bit like a kitchen
pinger timer, which you wound up to as many hours as you wanted and
the appliance was then on for that time (immersion heater was a
typical appliance). Looking for something similar for someone.
Needs to go up to 8 hours (or near). I can find ones that do 45
minutes, but not 8 hours. Anyone seen one?

In the end, I went for the following timer, which is quite a
nice little unit...

http://www.hugo-mueller.com/produkt/...,5,22,105.html

Bought it from CPC (did find it a bit cheaper elsewhere, but
it was too easy to just add it onto an existing CPC order).

--
Andrew Gabriel
[email address is not usable -- followup in the newsgroup]