• It is good practice to have all calibration components
previously assembled.
13. After the 30 second countdown:
• The display alternates between "CAL" and a value.
(for example: 60 PPM for 0 to 100 ppm carbon
monoxide). This value is the actual reading of the gas
concentration the sensor is detecting.
• Once the gas value on the display is stable for 15
seconds, the alternating display stops. If the calibration is
successful, the display will show END for approximately
two seconds. (FIGURE 3-16).
• There are no adjustments necessary.
• The display will show the
span gas value while the span
gas is flowing to the unit. (For
example, it may read 60 PPM
or 25 % or 60 %LEL; FIGURE
3-17.)
14. Turn OFF the gas flow by turning
the knob on the flow controller.
Figure 3-15.
Span Set-up
Figure 3-16.
Calibration End Display
Chapter 3, Calibration
3-19
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