Heater temperature stopping

[jimjim2991]

Using to a heater to heat 5L of water.

1. How can I stop this heater at 70C without a thermostat?
2. Will a potentiometer work?

 

[telectrix]

and you've had a like off me for your moan post.

 

[DPG]

Wonder where he's gone. Probably down Maplins for a big variable resistor?

 

[freddo]

Better off nicking one from an old stage lighting dimmer, he can then heat the room as well as his liquid.

 

[dmxtothemax]

1. How can I stop this heater at 70C without a thermostat - REMOVE HEAT
2. Will a potentiometer work? - NO

tell us more ?

 

[jimjim2991]

Whatever you do, don't just wire a potentiometer in series with your element!!
As said above, you need a sensor/thermostat of some sort. Why do you specifically not want to use a thermostat? This is the sort of job they are designed for!

What would happen if I wired in a potentiometer ?

The temperature control options I have seen have been quite expensive!

 

[Spoon]

What would happen if I wired in a potentiometer ?
The temperature control options I have seen have been quite expensive!

Can you please explain how you are going to wire the potentiometer into the circuit. You have been informed that this will not work.

What do you class as 'expensive'?

 

[DPG]

What would happen if I wired in a potentiometer ?

The temperature control options I have seen have been quite expensive!

A potentiometer is not designed to handle the current of a heating element. They will only handle a few hundred milli watts as a rule. There are high power versions available but these are rather specialist and probably more expensive than a simple thermostat.

If you wire a potentiometer in series with your heating element it will glow brightly and emit smoke.

 

[jimjim2991]

A potentiometer is not designed to handle the current of a heating element. They will only handle a few hundred milli watts as a rule. There are high power versions available but these are rather specialist and probably more expensive than a simple thermostat.

If you wire a potentiometer in series with your heating element it will glow brightly and emit smoke.

Okay, no potentiometer.

What kind of thermostat might I need? How do I control the temperature of water? How would these items send information to the heater?

 

[jimjim2991]

Can you please explain how you are going to wire the potentiometer into the circuit. You have been informed that this will not work.

What do you class as 'expensive'?

Okay, no potentiometer! What exactly do I need to measure and control temperature? How will information be sent to the heater?