Making a power supply for cylindrical heaters with a temperature sensor

Thread Starter

Slovenec

Joined Oct 15, 2019
4
This is gonna be my project for the next few days, you are welcome to pitch in ideas. I will add progress in this thread.

Goal:
-Make a power supply for x amount of cylidrical heaters with 1 temperature sensor

Components:
- X cylindrical heaters (in my case 3 heaters)
- Temperature sensor
- Board
- Display

Requirenments:
-Heaters need to reach 600°C
-They need to turn off after reaching that point (optional add a +/-20°C offset)
-Needs to be in a isolated box, with components easly reachable and replacable

Little backstory.
My mentor left me with a cluster **** of his old home made machines/controlers/devices I need to replace because I have no clue what I'm looking at once I open them up to fix them, not to mention the horror of craping off glue that covers pins on the boards................
Got a lot of work ahead of me.
 
Last edited by a moderator:

Dodgydave

Joined Jun 22, 2012
8,389
The psu Voltage depends on the Heater requirements, what current and voltage do they need?

As for Temperature control, you can get ready made modules on the internet.
 

Marley

Joined Apr 4, 2016
279
At that temperature you will need to use a thermocouple sensor.
The insulation will need to be ceramic or mineral insulated.

I would buy a ready-made temperature controller.

The heaters will probably be controlled with solid-state-relays (SSRs).
 

Thread Starter

Slovenec

Joined Oct 15, 2019
4
The psu Voltage depends on the Heater requirements, what current and voltage do they need?

As for Temperature control, you can get ready made modules on the internet.
The three heaters use 230V and around 2A (resistance value 100Ohm)

Thx I will look them up. Got any favorite electronics store?
 

Thread Starter

Slovenec

Joined Oct 15, 2019
4
At that temperature you will need to use a thermocouple sensor.
The insulation will need to be ceramic or mineral insulated.

I would buy a ready-made temperature controller.

The heaters will probably be controlled with solid-state-relays (SSRs).
Yes I have a thermocouple sensor ready.

Do you recomend I ether put all 3 heaters on one SSR or do I dedicate one SSR to each heater?
 

Dodgydave

Joined Jun 22, 2012
8,389
Last edited:

Marley

Joined Apr 4, 2016
279
Do you recomend I ether put all 3 heaters on one SSR or do I dedicate one SSR to each heater?
A more important question is:
Do you have just 1 sensor or do you have a separate sensor on each heater?

If you can guarantee that by applying equal power to each heater, the temperature of each cylinder will be the same, then:
Have 1 sensor, 1 temperature controller and have all 3 heaters controlled by this single controller. Either by wiring all the heaters from a single SSR or ues 3 SSRs all from the same controller.

If not, use a separate sensor, controller and SSR for each heater.
 

Thread Starter

Slovenec

Joined Oct 15, 2019
4
A more important question is:
Do you have just 1 sensor or do you have a separate sensor on each heater?

If you can guarantee that by applying equal power to each heater, the temperature of each cylinder will be the same, then:
Have 1 sensor, 1 temperature controller and have all 3 heaters controlled by this single controller. Either by wiring all the heaters from a single SSR or ues 3 SSRs all from the same controller.

If not, use a separate sensor, controller and SSR for each heater.
All three heaters will be heating the same soder bath.

So the best option would be Temperature controler;
something like https://octopart.com/search?category_ids=4781&maxoperatingtemperature=752 °C&start=0
with added SSR that would turn on power to three heaters.
Also I would add three fuses for each heater. And that would be pretty much it right.
 
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