I want to increase the vacuum chamber's temperature having size of (3ft*4ft) to about 200 degree Celsius, what are the best heaters to install and my substrate is glass. Tell me the best ways to increase the temperature upto 200 degree Celsius.
Based on your requirement, you can use either ceramic heater or radiant heater which can be used till 600 degree celsius with k-type thermocouple as temperature sensor. The former is the contact type and later is non-contact type. In contact type, the substrate will be in contact with the heater whereas in non-contact type, the substrate will be at a distance, heated by means of heat radiation .
Hope this information helps you. All the best.
Dear Raghav
As Mr Shoudhari said, if your chamber has flange that allow you to connect wires, then you can use tungsten wire, ceramic heaters or any similar heating methods, otherwise go to indirect heating like radiation, microwave or laser ablation.
Regards,
Raghav,
Are you wanting to heat the chamber?
Or are you trying to heat the substrate?
There are so many ways to make it.
- You can attach a resistance around the outside of your chamber. After that you have to isolate it.
- With the help of light you can manage that. If your chamber has some free ports on it, you can insert a powerful light source in order to increase the temperature in your chamber.
I also have a similar question; I have a self made stainless steel vacuum chamber. It has a nice standard flange opening with ports (actually welded threaded pipes) on it. From those ports I want to insert some cables into the chamber for providing electricity to a hot plate.
Actually I sealed it with a resin around the cable but there are micro leakages. I lose 0,1 bar in 3 hours. Which can be critical due to the air entrance to my ethanol pyrolisis process.
How are cables entering to your vacuum chambers?
Is there standardised solution for that?
Something of the shelf with some threads on it that I can screw to the metal hull of the chamber?
Good morning Onur,
There are indeed a great many Commercial Off The Shelf (COTS) electrical feedthroughs. And they are available for all standard fittings (KF, CF, ISO, etc.)
They all require that your chamber has a flanged port to start with!
https://www.lesker.com/newweb/feedthroughs/instrument_feedthroughs_multipin_mpt_singleend.cfm?pgid=kf
With terminal blocks to connect to the wires - is ideal if you need substantial currents.
But if you are on a budget, and need very few lines, then a slab of polycarbonate can be epoxied to the hole of your chamber, with two narrow holes drilled through it to take two solid copper wires. Use a vacuum epoxy if you like (but it's not crucial unless you get to the point where analytical UHV is needed).
Your leak, I presume, might have been from the gap between the wires of a cable and the plastic insulation. Use solid core copper, with no insulation.