7. Allow the instrument to achieve a prolonged, stable measurement response and note down the
NH
3
reading as shown on the instrument. Label this measurement as [NH
3
]
MEASURED
.
8. Use the noted measurements to calculate the converter efficiency using Equation 6.
9. Repeat steps 6 to 8 for a minimum of two more NH
3
concentrations spread across the
measurement range of the instrument.
10. Average the efficiencies. If the calculated result is greater than 80% efficient, the test has passed.
Enter the result as the new Conv. Efficiency NO2. If the converter efficiency is below 80%, the
test has failed. This may indicate a fault with one or more of the components in the N
X
flow path.
Try repeating the test and make sure there are no issues with your calibration system. Ensure
there is no leaks, backpressure or contamination in your calibration system (refer to Section 7).
11. Open - Main Menu Calibration Menu.
12. Edit - Conv. Efficiency NH3 - (enter averaged efficiency result (only if test passed)) - Accept.
Note: It is very difficult to get a reliable source of NH
3
reference gas. Choose you gas supplier with
care.
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