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10.4 Gas Calibration Verification
This section details using precision calibration gases to check the analyzer settings. It does not replace an
annual calibration and service by an authorized agent.
Access to the calibration functions are found in menu
1. SELECT
, sub menu
CAL
.
10.4.1 Calibration Gas Values
To allow the analyzer to check its calibration it must know the values of calibration gas contained in the
bottle. Select GAS VALUE in the menu shown above. Pressing will access the following screen:
Enter the gas values as shown on the calibration gas bottle. Note CO and CO2 are expressed in percentage %,
HC is ppm propane and NOx in ppm. Setting each number is as detailed Set Up Menu (Section 5.2.9). Once
the values are correct press the key to save the data and exit.
Note!
If you do not have a NOx sensor fitted to your analyzer then you will not need to enter a gas value.
N/F will be displayed.
HC - HydroCarbon readings
During the calibration routine HC readings will be expressed as n-hexane even though the gas bottle will
contain propane. It is important to understand that when entering the HC gas value into the analyzer the
value on the calibration gas bottle is entered. In our example 2000 ppm propane.
When performing a calibration reading or check the analyzer will automatically convert the readings using
the PEF and express them as n-hexane.
Using the PEF detailed on page 15 of this manual the analyzer would display:
HC displayed reading (n-hexane) = 2000 ppm x PEF
= 2000 x 0.512 = 1024 ppm
F
UEL
: GASOLINE
RPM
: 4 STROKE
ZERO
: NO
CAL
: GAS VALUE
GAS VALUE
CO : 3.50
CO2 : 14.0
HC : 2000
NOX : 1000
'LEFT' USE STORE KEY
