Continue to Site

Welcome to our site!

Electro Tech is an online community (with over 170,000 members) who enjoy talking about and building electronic circuits, projects and gadgets. To participate you need to register. Registration is free. Click here to register now.

  • Welcome to our site! Electro Tech is an online community (with over 170,000 members) who enjoy talking about and building electronic circuits, projects and gadgets. To participate you need to register. Registration is free. Click here to register now.

Thermal Switch

Status
Not open for further replies.

tehjrow

New Member
So i'm pondering a project that's basically gonna be a small water heater. However it needs to measure the temp of the water and turn on/off based on it's temp. The water needs to stay between 100F and 110F. Is there a switch that will be able to be IN the water and measure the temp?
 
Basically you can use any kind of temperature sensor (NTSc, PTCs and ICs)for that purpose.

To make it waterproof you might encapsule it with a chemistry glass or a copper pipe sealed with solder at the bottom and silcone on top (not dunk in water).

In case the sensor malfunctions it is easier to remove the silicone and replace the sensor.

A temperature controlled circuit for US$ 98 seems highly overprized to me.

Boncuk
 
Do you want to build your own temperature controller?
If so, do you want to start from a commercial sensor**broken link removed**
How are you heating the vessel with the water?
How many Watts? Volts?
 
How are you heating the vessel with the water?
How many Watts? Volts?

Honestly haven't gotten that far yet. Just thought about this today. Figured the temp sensor/switch would be the most difficult part so I started there.
 
I would start with the Thermodynamics;)

It takes a lot of watts to heat a little bit of water. For example, the wife's electric tea pot has a 1500W heater. My Mr Coffee is like 1200W, and that only makes 4 cups.

Electric house water heaters are typically 5 to 10KW. Knowing the quantity of water and how rapidly you need to heat it will go a long way to defining your project.
 
I would start with the Thermodynamics;)

It takes a lot of watts to heat a little bit of water. For example, the wife's electric tea pot has a 1500W heater. My Mr Coffee is like 1200W, and that only makes 4 cups.

As far as I can see he just wants to heat a small amount of water to temperatures between 100deg/F (37.7deg/C) and 110deg/F (43.3deg/C).

It won't require hight wattage for such a temperature.

Making tea almost boiling water is required. (about 60deg/C to go)

Boncuk
 
Hi,

You could consider an aquarium water heater. They are not very expensive and available from 7.5 to 300 watts and maybe more. All is there for what you need except that the maximum temp. do not exceed 93F on the ones I saw. Maybe with a little tweaking....!

Aquarium Heaters

( Around here, a typical domestic electric water heater would be 3 or 4.5kW )

Alain
 
Last edited:
Status
Not open for further replies.

Latest threads

New Articles From Microcontroller Tips

Back
Top