Line A Combustion Analyzers

Question 1

What is the main reason for performing combustion analysis on gas fired equipment?

Answer 1

To ensure the equipment is operating in a safe and efficient manner.

Question 2

How often should your combustion analyser be calibrated to ensure accurate test readings?

Answer 2

Once per year.

Question 3

Where should the sampling probe take a sample from on a gas fired appliance?

Answer 3

Upstream of any draft control device or just downstream of a stack economizer.

Question 4

What is the correct way to allow combustion analysis samples to be taken with plastic S636 systems?

Answer 4

Installing an access tee with a ½” tapped bushing as close as possible to the flue collar of the appliance where either a plastic or brass plug can be inserted.

Question 5

What is a Peltier cooler used for in a combustion analyzer?

Answer 5

To drive out moisture from the sample

Question 6

The gas cells in a combustion analyser are of what type?

Answer 6

Electrochemical

Question 7

What can shorten the life span of the toxic sensors in a combustion analyser?

Answer 7

High gas concentrations or insufficient purging

Question 8

What is the chemical formula for the Perfect combustion of Natural Gas?

Answer 8

1CO2 + 2H2O = 8N2

Question 9

What is the chemical formula for the Perfect combustion of Propane?

Answer 9

3C02 + 4H2O = 20N2

Question 10

What is added to the combustion process to produce Complete combustion?

Answer 10

Excess Air

Question 11

What is the expected percentage range of O2 produced by a forced draft burner with CH4 as the fuel?

Answer 11

3% - 6%

Question 12

What are four characteristics of Carbon Monoxide?

Answer 12

Toxic, colourless, odourless and tasteless

Question 13

What can cause too much draft in a venting system?

Answer 13

High stack temperatures

Question 14

What percentage gain in efficiency is achieved by lowering stack temperature by 45⁰F?

Answer 14

Less than 1%

Question 15

Calculate the net stack temperature if the ambient temperature is 72⁰F and the stack temperature is 420⁰F? Is this temperature within typically expected values?

Answer 15

348⁰F, Yes (330 - 500⁰F)

Question 16

If the measure percent O2 reading is 4.1% and the measured NOx reading is 55 ppm, what would the NOx ppm be when corrected to standard?

Answer 16

58.58 ppm

Question 17

If the measured CO reading is 38 ppm, and the measured %O2 reading is 4.2% what would the calculated air-free ppm reading be?

Answer 17

47.56 ppm