Searching \ for '[EE] Thermal fuse advice' in subject line. ()
Make payments with PayPal - it's fast, free and secure! Help us get a faster server
FAQ page: www.piclist.com/techref/index.htm?key=thermal+fuse+advice
Search entire site for: 'Thermal fuse advice'.

Exact match. Not showing close matches.
PICList Thread
'[EE] Thermal fuse advice'
2008\04\07@201806 by Jinx

face picon face
The thermal fuse in our deep fryer is open. Looking around, the
recommended cooking temperature for a fryer is around 175C
(350F). Presumably the fuse would have been rated higher than
that. How much, I don't know. The fuse would be there to guard
against something like a thermostat failure

The fuse is marked Microtemp 4377A BKAUL

I wonder though, if the cooking is always supervised, whether a
thermal fuse is absolutely necessary. Prudent, obviously

One source, RS, has several fuses in that temperature range, and
15mA to 15A current (fryer is 1800W).  But you have to buy a
pack of 5. Won't be doing that, will look elsewhere if I do put a
new one in

So, no real question that sticks out, just musing for comments

2008\04\07@203633 by Richard Prosser

picon face
Do you have to go to RS?
Here in Chch I can get all sorts of spares by just going to one of the
repair shops that has set itself up to provide bits & pieces to the
general population (and trade).

The one I frequent most is "Samsons" (although they're now blacklisted
due to their exorbitant charges for a WM repair quote) but even F&P
have a local outlet now.

Otherwise you may be able to get something suitable from Trade-Tech. A
lot of these trade suppliers will sell direct to the public if you ask
- you just have to know what to ask for.

I think even Dick Smith used to have thermal fuses listed.

RP

On 08/04/2008, Jinx <spam_OUTjoecolquittTakeThisOuTspamclear.net.nz> wrote:
{Quote hidden}

> -

2008\04\07@205042 by Marcel Duchamp

picon face
Jinx wrote:
> The thermal fuse in our deep fryer is open. Looking around, the
> recommended cooking temperature for a fryer is around 175C
> (350F). Presumably the fuse would have been rated higher than
> that. How much, I don't know. The fuse would be there to guard
> against something like a thermostat failure
>
> The fuse is marked Microtemp 4377A BKAUL
>
> I wonder though, if the cooking is always supervised, whether a
> thermal fuse is absolutely necessary. Prudent, obviously
>
> One source, RS, has several fuses in that temperature range, and
> 15mA to 15A current (fryer is 1800W).  But you have to buy a
> pack of 5. Won't be doing that, will look elsewhere if I do put a
> new one in
>
> So, no real question that sticks out, just musing for comments
>


My only comment  is to consider what happens if the fuse is needed but has been shorted out by an admitted "boffin".  Stop thinking about yourself for a moment and think about those of us on the list...

The last thing any of us want to read with the morning coffee is an email from someone named "APPTECH" telling us what the funeral arrangements are going to be for the poor soul who was found in the smoking ashes of a home in Auckland.  Said soul being a frequent contributor to the notorious piclist.

Sheesh.

2008\04\07@212011 by Dr Skip

picon face
I personally would go without. It's only in the last few years that they've
been added anyway. I suspect it's from component pricing making it reasonable
these days, and from testing being successful in other more critical areas. Of
10 million units produced, 10k fail, and less than 10 fail with the main stat
stuck on.... ;) My guesstimate.

It might be easier to salvage a thermostat from a junk unit and put it in
series... ;) Belt AND suspenders...

There was an EDN writeup a year ago or so about bad thermal fuses from China in
the supply. You can also use a thermal switch instead, so it resets itself. Run
a light in parallel so you know when it triggers and pick a temp at or about
the smoke point of your favorite oil.

And there's always a thermocouple and a PIC with a relay....


Jinx wrote:
{Quote hidden}

2008\04\07@212600 by Apptech

face
flavicon
face
Surplustronics may have some.

Jaycar have a range at $3.50/1 retail

192 C
   http://www.jaycar.co.nz/productView.asp?ID=ST3810&CATID=&keywords=thermal+fuse&SPECIAL=&form=KEYWORD&ProdCodeOnly=&Keyword1=&Keyword2=&pageNumber=&priceMin=&priceMax=&SUBCATID=

216 C
   http://www.jaycar.co.nz/productView.asp?ID=ST3812&CATID=&keywords=thermal+fuse&SPECIAL=&form=KEYWORD&ProdCodeOnly=&Keyword1=&Keyword2=&pageNumber=&priceMin=&priceMax=&SUBCATID=

etc
   http://www.jaycar.co.nz/productResults.asp?whichpage=2&pagesize=10&keywords=thermal+fuse&CATID=&SUBCATID=&form=KEYWORD&SPECIAL=&ProdCodeOnly=&Keyword1=&Keyword2=&pageNumber=&priceMin=&priceMax=



       Russell

> The thermal fuse in our deep fryer is open. Looking
> around, the
> recommended cooking temperature for a fryer is around 175C
> (350F). Presumably the fuse would have been rated higher
> than
> that. How much, I don't know. The fuse would be there to
> guard
> against something like a thermostat failure

2008\04\07@213713 by Jinx

face picon face
> My only comment  is to consider what happens if the fuse is
> needed but has been shorted out by an admitted "boffin".  Stop
> thinking about yourself for a moment and think about those of
> us on the list...

Fair enough. Good point

> the funeral arrangements are going to be for the poor soul who
> was found in the smoking ashes of a home in Auckland

For the record then - music will be Vaughan Williams' The Lark
Ascending ('cos that's what I am and that's the way I'm going),
a guard of honour arch with raised soldering irons and a statue
of me, Teddy Roosevelt bear-hunt style, with one foot on a PIC

At least ......

2008\04\07@223507 by John Gardner

picon face
"Werewolves of London" would've been my choice.

On 4/7/08, Jinx <.....joecolquittKILLspamspam@spam@clear.net.nz> wrote:
> > My only comment  is to consider what happens if the fuse is
> > needed but has been shorted out by an admitted "boffin".  Stop
> > thinking about yourself for a moment and think about those of
> > us on the list...
>
> Fair enough. Good point
>
> > the funeral arrangements are going to be for the poor soul who
> > was found in the smoking ashes of a home in Auckland
>
> For the record then - music will be Vaughan Williams' The Lark
> Ascending ('cos that's what I am and that's the way I'm going),
> a guard of honour arch with raised soldering irons and a statue
> of me, Teddy Roosevelt bear-hunt style, with one foot on a PIC
>
> At least ......
>
> -

2008\04\07@231353 by David VanHorn

picon face
>  of me, Teddy Roosevelt bear-hunt style, with one foot on a PIC

I did that once, on  a 40 pin dip... OUCH!

2008\04\08@012001 by Jinx

face picon face

> Jaycar have a range at $3.50/1 retail

Looks like Cory's have what I need

2008\04\08@044342 by Alan B. Pearce

face picon face
>>  of me, Teddy Roosevelt bear-hunt style, with one foot on a PIC
>
>I did that once, on  a 40 pin dip... OUCH!

yeah, you gotta watch those porcupines ... (see the OT thread ...)

2008\04\08@044437 by Jinx

face picon face

> I did that once, on  a 40 pin dip... OUCH!

Yes indeedy ouch. DIP pins are sharp. I've done that too
but wouldn't say that's the whole reason I use SMT when
possible

2008\04\09@093800 by Philip Stubbs

flavicon
face
On 08/04/2008, Jinx <joecolquittspamKILLspamclear.net.nz> wrote:
> The thermal fuse in our deep fryer is open. Looking around, the
>  recommended cooking temperature for a fryer is around 175C
>  (350F). Presumably the fuse would have been rated higher than
>  that. How much, I don't know. The fuse would be there to guard
>  against something like a thermostat failure

That is correct.

>  The fuse is marked Microtemp 4377A BKAUL
>
>  I wonder though, if the cooking is always supervised, whether a
>  thermal fuse is absolutely necessary. Prudent, obviously

Not just prudent. I would say essential. I used to work for a company
and did lots of development work on Deep Fat Fryers. My advice would
be to fit the same as was originally fitted. You have to be careful
with selecting a value. The temperature where the fuse is fitted can
be some way off the temperature of the oil, depending on the type of
construction of the fryer. The ones I worked on had a die cast
aluminium bowl, with an electric element attached to the bottom, and a
variable thermostat attached to the front. The thermostat was rated at
something like 156C for an oil temperature of 190C.

If you put a fuse of too low a temperature, there could be occasions
where it gets too hot and will fail again. The other problem could be
if the fuse is too high, then the oil may get too hot and you risk
having a fire. If you were in the room, I would hope that the
billowing smoke will warn you to turn it off before it does catch
light :-)

When you replace the fuse, make sure that you use the same mounting
method. That could have an effect on the temperature that it sees.

For the ultimate deep fryer, a micro controller is the way to go. We
built a test rig with an old laptop controlling a fryer using a NTC
device as the temperature sensor. After playing with the control
system for a few weeks, we had the ultimate chip fryer. It even had
funky safety features such as detecting that the oil was too low by
looking at the rate of heating, and then switching off. The idea was
to refine the control, and then implement it in a PIC for production.
However, the cost was too high at the time.


>  One source, RS, has several fuses in that temperature range, and
>  15mA to 15A current (fryer is 1800W).  But you have to buy a
>  pack of 5. Won't be doing that, will look elsewhere if I do put a
>  new one in

Please put a new one in! Yours and your households safety deserve it.

>  So, no real question that sticks out, just musing for comments

--
Philip Stubbs

More... (looser matching)
- Last day of these posts
- In 2008 , 2009 only
- Today
- New search...