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### Author Topic: Automation for a fireplace  (Read 4131 times)

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#### kam

• Hero Member
• Posts: 1849
##### Automation for a fireplace
« on: December 01, 2009, 19:36:43 PM »
This is an idea 2 years old now, but 2 days ago i found someone that has the knowledge and some kind of experience. I want to make a monitoring system for the fireplace. The fireplace will only receive air from a hose that comes directly outside the house. The air volume will be controlled with a neat stepper motor that i already own. After a short discussion with this guy, he told me that in order to have maximum efficiency without having problems in the chimney, i had to monitor the O2 from the exhaust and the fire temperature.

What i want to find is a temperature meter capable of measuring a fire in the fireplace and an O2 sensor. It could also be nice to have a negative pressure sensor in the air input hose, just for the records.

#### kourt

• Guest
##### Re: Automation for a fireplace
« Reply #1 on: December 02, 2009, 18:16:13 PM »
These ideas only from Kam's brain can  be born.

#### kourt

• Guest
##### Re: Automation for a fireplace
« Reply #2 on: December 02, 2009, 18:53:33 PM »
1.Temperature sensor
Usually for these operations we use thermpcouples.The maximum temperature range is 1200o C and there is no problem if you have the sensor in the fire. The material of this  sensor is Ni/Cr.Τhe transmission of the signal is made also with Ni/Cr cable. BUT ,in the point that you connect this cable with  a copper cable ( where ever it is, maybe on PCB ) you must have a temperature sensor in this point ( pt sensor ) to have a measurement and you must SUB this measurement from thermocouple's measurement ( I did my best , i hope you understant ).
2.O2 sensor
(Do you know what is the perfect measurement of O2 to excaust ? )
There are many of temperature sensors in the market.BUT, they are expensive if you want to install them inside of the fireplace , or there are cheaper if you use them out of fireplace. ( you can take sample , i don't know how , you use filters e.t.c. )
3.Negative pressure sensor
There are in the market pressure transmitter with minus input , BUT you must pay .
The output signal of these is 4-20mA.
Don't forget , you must PAY for your KAM's ideas  .

#### kam

• Hero Member
• Posts: 1849
##### Re: Automation for a fireplace
« Reply #3 on: December 02, 2009, 21:41:28 PM »
Well kourt, of course i will pay, as long as i do not have to sell a house for a sensor. I know that there are negative pressure sensors. What i do not know is where to find them and how much they cost.

The O2 sensor is cheap and i will get it from you.

As for the temp sensor, i will receive it as a donation to pcbheaven

#### kourt

• Guest
##### Re: Automation for a fireplace
« Reply #4 on: December 04, 2009, 21:24:42 PM »
The oxygen sensor will cost you about 50-60 Euro ( kourt price ).
For the negative pressure transmitter i do not know yet the cost but it is difficault to find this transmitter because the minus pressure that you will have ( in the air input hose ) will be about 10-20 mbar ( too low ).The most close range of transmitter  in this measurement ( as i know )  is -1/2 bar.