EMS 5002 Operator's Manual page 12

Calibration
2. The screen will display "sending cal data" (figure 21).Once the calibration gas values
have been sent to the bench,the calibration procedure can continue.
3. The screen will display the gases (Figure 22)and the message to connect the CAl
gas. Connect the hose from the regulator assembly to the sample hose inlet. Open the
valve on the gas bottle. (Note: Do not adjust the regulator, this was preset to the
appropriate flow rate.) Once the calibration gas values stabilize, depress the "CAL"
button. The analyzer will capture the gas concentrations and perform the final calibra-
tion procedure. The calibration process is now complete.
4. The screen will display a message " calibration complete" (Figure 23). If the calibra-
tion procedure was canceled, the screen will display a message "calibration canceled"
(Figure 24), if the calibration was unsuccessful, an error message will be displayed on
the main sampling screen. If this occurs, go to the menu screen and errors. one of the
gases will show up as "HC or CO or CO2 C Warn". Go back to the main sampling
screen and "ZERO" the unit to clear the error. After either situation, perform the calibra-
tion procedure again. If the problem continues, contact EMS or your local distributor.
NOTE: The hydrocarbon gas in the calibration cylinder is propane, and the gas ana-
lyzer generally measures hexane. This is problematical, as hexane is a molecule that is
about twice as large as propane. This means that the typical HC reading on the gas
analyzer (hexane) should be about ½ the propane value on the calibration cylinder tag.
That is, if the tag states that the cylinder contains 1200 ppm propane, then an analyzer
measuring HC as hexane will report HC at about 600 ppm.
Figure 21 Figure 22
Figure 23 Figure 24
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