Thermocouple
Posted by IanJohnson
|
Thermocouple July 31, 2012 03:46PM |
Registered: 13 years ago Posts: 132 |
I'm looking at getting a thermocouple for measuring the hot end. Is this the correct type?
[www.amazon.com]
Do you tape the end of the wire to the bottom of the nozzle to measure the temp?
[www.amazon.com]
Do you tape the end of the wire to the bottom of the nozzle to measure the temp?
|
Re: Thermocouple July 31, 2012 03:53PM |
Admin Registered: 16 years ago Posts: 1,470 |
That should work, but remember that you will need a thermocouple amplification board too. Most people use thermistors as they are cheap and accurate enough for our purposes, and can be hooked up directly to our electronics.
|
Help improve the RepRap wiki!
Just click "Edit" in the top-right corner of the page and start typing. Anyone can edit the wiki! |
|
Re: Thermocouple July 31, 2012 04:19PM |
Registered: 14 years ago Posts: 1,780 |
|
Re: Thermocouple July 31, 2012 04:43PM |
Registered: 13 years ago Posts: 132 |
I'm looking to calibrate the thermistor, or at least get a real world point of reference for its readings. Are the wire types like this usually thin enough to go into hot ends sized for 1.75 filament?
This is the one I had meant to link to - [www.amazon.com]
Descriptions generally don't say what the size of the wire is with the insulation. Would the insulation be OK at inside a 200C barrel?
This is the one I had meant to link to - [www.amazon.com]
Descriptions generally don't say what the size of the wire is with the insulation. Would the insulation be OK at inside a 200C barrel?
|
Re: Thermocouple July 31, 2012 04:59PM |
Registered: 14 years ago Posts: 643 |
|
Re: Thermocouple July 31, 2012 05:17PM |
Registered: 14 years ago Posts: 581 |
I would buy a cheaper one with fiberglass insulation more like this [www.amazon.com]
www.Fablicator.com
www.Fablicator.com
|
Re: Thermocouple July 31, 2012 06:10PM |
Admin Registered: 18 years ago Posts: 7,883 |
I find the black heat-shrink insulation on those melts inside an extruder and makes a mess. I put it inside PTFE sleeving about 150mm long to protect it and make it stiff enough to feed into an extruder. It would be too thick for a 2mm barrel though.
[www.hydraraptor.blogspot.com]
[www.hydraraptor.blogspot.com]
|
Re: Thermocouple July 31, 2012 11:30PM |
Registered: 14 years ago Posts: 581 |
|
Re: Thermocouple August 01, 2012 05:37AM |
Registered: 14 years ago Posts: 7,616 |
Quote
I'm looking to calibrate the thermistor
Getting an ordinary thermometer? Also, a water-ice mixture has pretty exactly 0 °C and cooking water 95 to 100 °C, depending on the height of the water above main sea level. Two points which can be reproduced well.
| Generation 7 Electronics | Teacup Firmware | RepRap DIY |
|
Re: Thermocouple August 01, 2012 06:24AM |
Registered: 15 years ago Posts: 3,742 |
True but 0°C and 100°C are only two points and not in the area of interest.
Who cares if we see 10°C or 30°C when the room temperature is 21°C?
What we want is accurate readings between 180°C and 260°C!
Bob Morrison
Wörth am Rhein, Germany
"Luke, use the source!"
BLOG - PHOTOS - Thingiverse
Who cares if we see 10°C or 30°C when the room temperature is 21°C?
What we want is accurate readings between 180°C and 260°C!
Bob Morrison
Wörth am Rhein, Germany
"Luke, use the source!"
BLOG - PHOTOS - Thingiverse
|
Re: Thermocouple August 01, 2012 07:06AM |
Registered: 14 years ago Posts: 1,780 |
Quote
Traumflug
Getting an ordinary thermometer? Also, a water-ice mixture has pretty exactly 0 °C and cooking water 95 to 100 °C, depending on the height of the water above main sea level. Two points which can be reproduced well.
The idea is to measure the actual temperature in the nozzle to also compensate for temperature gradient from the sensor to the nozzle.
|
Re: Thermocouple August 25, 2012 01:34PM |
Registered: 13 years ago Posts: 21 |
Here is a link to Thermocouple trouble shooting and heater measurements. I got tired of keep commenting so I wrote it up in one place.
TC Info and troubleshooting
Bertho
TC Info and troubleshooting
Bertho
|
Re: Thermocouple August 26, 2012 07:59AM |
Registered: 14 years ago Posts: 1,780 |
Sorry, only registered users may post in this forum.