Hot plate design question

D

Dan Ritter

Guest
I'm wanting to build my own hot plate for smt stuff and desoldering
components from pcb's. I was thinking of tearing apart a toaster oven
for the heating element and using a dimmer switch to control the heat.
However I can't figure out how to measure the temperature. It's too hot
for regular temperature sensors. Does anyone else have any ideas?

Thanks
 
On Fri, 19 Mar 2004 05:18:40 GMT, the renowned Dan Ritter
<danritterremove@telus.net> wrote:

I'm wanting to build my own hot plate for smt stuff and desoldering
components from pcb's. I was thinking of tearing apart a toaster oven
for the heating element and using a dimmer switch to control the heat.
However I can't figure out how to measure the temperature. It's too hot
for regular temperature sensors. Does anyone else have any ideas?
Click to expand...
Use a thermocouple. Maybe your DVM has a T/C input. You can buy a
simple bead probe for < $10.

Best regards,
Spehro Pefhany
--
"it's the network..." "The Journey is the reward"
speff@interlog.com Info for manufacturers: http://www.trexon.com
Embedded software/hardware/analog Info for designers: http://www.speff.com
 
"Dan Ritter" <danritterremove@telus.net> wrote in message
news:Qov6c.209685$A12.143412@edtnps84...
I'm wanting to build my own hot plate for smt stuff and desoldering
components from pcb's. I was thinking of tearing apart a toaster oven
for the heating element and using a dimmer switch to control the heat.
However I can't figure out how to measure the temperature. It's too hot
for regular temperature sensors. Does anyone else have any ideas?
Click to expand...
You can use a bi-metal strip termostate (also used in irons for clothes)

Wim
 
Spehro Pefhany wrote:
On Fri, 19 Mar 2004 05:18:40 GMT, the renowned Dan Ritter
danritterremove@telus.net> wrote:


I'm wanting to build my own hot plate for smt stuff and desoldering
components from pcb's. I was thinking of tearing apart a toaster oven
for the heating element and using a dimmer switch to control the heat.
However I can't figure out how to measure the temperature. It's too hot
for regular temperature sensors. Does anyone else have any ideas?


Use a thermocouple. Maybe your DVM has a T/C input. You can buy a
simple bead probe for < $10.

Best regards,
Spehro Pefhany
Click to expand...
Thanks. A thermocouple looks like the solution. And maybe I should
know this but what is T/C?
 
Wim Ton wrote:

"Dan Ritter" <danritterremove@telus.net> wrote in message
news:Qov6c.209685$A12.143412@edtnps84...

I'm wanting to build my own hot plate for smt stuff and desoldering
components from pcb's. I was thinking of tearing apart a toaster oven
for the heating element and using a dimmer switch to control the heat.
However I can't figure out how to measure the temperature. It's too hot
for regular temperature sensors. Does anyone else have any ideas?



You can use a bi-metal strip termostate (also used in irons for clothes)

Wim


How would I mount that to check the temperature of the plate, direct
Click to expand...
contact?
 
On Sat, 20 Mar 2004 21:31:38 GMT, the renowned Dan Ritter
<danritterremove@telus.net> wrote:

Spehro Pefhany wrote:
On Fri, 19 Mar 2004 05:18:40 GMT, the renowned Dan Ritter
danritterremove@telus.net> wrote:


I'm wanting to build my own hot plate for smt stuff and desoldering
components from pcb's. I was thinking of tearing apart a toaster oven
for the heating element and using a dimmer switch to control the heat.
However I can't figure out how to measure the temperature. It's too hot
for regular temperature sensors. Does anyone else have any ideas?


Use a thermocouple. Maybe your DVM has a T/C input. You can buy a
simple bead probe for < $10.

Best regards,
Spehro Pefhany

Thanks. A thermocouple looks like the solution. And maybe I should
know this but what is T/C?
Click to expand...
Thermocouple. ;-)

Best regards,
Spehro Pefhany
--
"it's the network..." "The Journey is the reward"
speff@interlog.com Info for manufacturers: http://www.trexon.com
Embedded software/hardware/analog Info for designers: http://www.speff.com
 
"Dan Ritter" <danritterremove@telus.net> wrote in message
news:405CB886.4010303@telus.net...
Wim Ton wrote:

"Dan Ritter" <danritterremove@telus.net> wrote in message
news:Qov6c.209685$A12.143412@edtnps84...

I'm wanting to build my own hot plate for smt stuff and desoldering
components from pcb's. I was thinking of tearing apart a toaster oven
for the heating element and using a dimmer switch to control the heat.
However I can't figure out how to measure the temperature. It's too hot
for regular temperature sensors. Does anyone else have any ideas?



You can use a bi-metal strip termostate (also used in irons for clothes)

Wim


How would I mount that to check the temperature of the plate, direct
contact?
Click to expand...
For a low voltage system you can use direct contact, in an iron the
thermostat is mounted on a block of ceramics near the plate. There will be
some temperature difference between plate and thermostate of course, but as
long if it is constant...

How about using a modified iron anyway, may save a lot of time and money ,
but the size is limited and awkward.

Wim
 
There must be more to this than meets the eye, but why now buy a stand-alone
single hot plate? They're very neat and cheap - I've used one for years with a
cheap pressure-cooker vessel on it (it was handy, a good size, and made of quite
heavy gauge Al, so the inside temp was quite uniform) to test for temperature
effects.

What temp range do you need for SMT?

What's the desoldering process?

On Sat, 20 Mar 2004 10:05:06 -0000, "Wim Ton" <wimton@blueyonder.co.uk> wrote:
"Dan Ritter" <danritterremove@telus.net> wrote in message
news:Qov6c.209685$A12.143412@edtnps84...
I'm wanting to build my own hot plate for smt stuff and desoldering
components from pcb's. I was thinking of tearing apart a toaster oven
for the heating element and using a dimmer switch to control the heat.
However I can't figure out how to measure the temperature. It's too hot
for regular temperature sensors. Does anyone else have any ideas?

You can use a bi-metal strip termostate (also used in irons for clothes)

Wim
Click to expand...
Tony (remove the "_" to reply by email)
 
On Sun, 21 Mar 2004 04:08:05 GMT, the renowned "Tom Del Rosso"
<tdnews01@att.net.invalid> wrote:

In news:ca4l50p3qcg9gkjpspp00jqqfhuts07pkl@4ax.com,
Spehro Pefhany typed:

Use a thermocouple. Maybe your DVM has a T/C input. You can buy a
simple bead probe for < $10.

What's different about a T/C input? It's a voltage, right?
Click to expand...
A somewhat nonlinear very low voltage (<10uV/°C for type R and S) that
requires cold-junction compensation. Probably the cheap DVMs cheat on
the linearization, I've never bothered to hook one up to one of my
thermocouple calibrators to find out.

Best regards,
Spehro Pefhany
--
"it's the network..." "The Journey is the reward"
speff@interlog.com Info for manufacturers: http://www.trexon.com
Embedded software/hardware/analog Info for designers: http://www.speff.com
 
in article Qov6c.209685$A12.143412@edtnps84, Dan Ritter at
danritterremove@telus.net wrote on 3/18/04 23:18:

I'm wanting to build my own hot plate for smt stuff and desoldering
components from pcb's. I was thinking of tearing apart a toaster oven
for the heating element and using a dimmer switch to control the heat.
However I can't figure out how to measure the temperature. It's too hot
for regular temperature sensors. Does anyone else have any ideas?

Thanks
Would this help?
Click to expand...

http://www.mcmaster.com/asp/DisplCtlgPage.asp?ReqTyp=CATALOG&CtlgPgNbr=491&C
tlgEdition=&RelatedCtlgPgs=484,485,490,491,492,493,494,495,496,1027,1392&ses
nextrep=316762778069952&ScreenWidth=1024&McMMainWidth=749&ToolsetID=ToolMult
iPageNav#.

We used these or similar along w/ pulse proportional controlers and heaters
for control of extruder barrel temp.
HTH
Dave Cole
 
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