Measuring Boiler Efficiency with a Flue Gas Analyser

What You'll Need
Gas Flue Analyser
Electro-Chemical Analyser

A flue gas analyser (sometimes spelled flue gas analyzer) is a very useful tool which can be used to measure the efficiency of a boiler. Boiler efficiency can depend on a number of factors, many of which can be tweaked.

A flue gas analyzer will also mitigate the impact that you are having on the environment. Burning gas can release toxic chemicals into the atmosphere. A flue gas analyser can detect these chemicals and help you to fix the problem. You can perform a number of tests to measure your boiler efficiency and check for the presence of toxic chemicals.

Step 1 - Checking the Temperature

The first thing that you will need to do is check the temperature at the bottom of the flue, which is done using the thermocouple. Take a few different measurements and record the highest one.

Step 2 - Choosing a Sample Location

Now you will need to choose a sample location where you are going to be doing the work, drill a small hole into the wall which will pass into the flue and use the electric chemical probe to check for the types of chemicals present. When drilling the hole try to make it as tight a fit as possible to minimize the chance of any gasses escaping and entering the room again.

Step 3 - Flue Gas Readings

Now you need to use your flue gas analyzer and start taking readings during the ramp up phases of your boilers cycle. Take a reading every half minute or so and record the types of gasses, temperature and flow rate.

During the test data phase you will need to take readings using the gas flue analyzer every 15 seconds, recording the data. This should make it possible to work out the average concentration of each gas that is present in the samples which are released from the boiler during normal operation.

Now during the refresh phrase you should take flue readings and note them. The best type of gas flue analyzer to use is one which has a heated probe to make sure that moisture does not condense and result in inaccurate results. You will also find this easier if you have a gas analyzer which is capable of storing data because this will mean that you can remember the different measurements.

Step 4 - Results

The results will then need to be analysed and inspected to check and find out what is happening. You will then be able to ask for professional help to adjust your boiler so that it is as efficient and reliable as possible. Changing various settings and tweaking the inputs can change the results considerably.