F-900 Instruction Manual 8/14/2017
1554 NE 3
rd
Ave, Camas, WA 98607, USA Phone: (360) 833-8835
29
www.felixinstruments.com
As given in the specifications on page 3, CO
2
ppm zero calibration is recommended weekly.
CO
2
PCT zero calibration is recommended every six months. However, if the unit is in an
environment where the temperature fluctuates frequently, zero calibration may be necessary
more often than the recommended intervals.
CO2 PPM
Calibration of the CO2 ppm sensor follows the standard operating procedure when using a
standard gas to set zero. Please see page 29. An alternate method exits for setting zero with
the use of Soda Lime and is described below.
1.
Select the re-calibration function for the CO2 ppm sensor.
2.
The display will read ‘internal offset’ and prompt the user to setup N2. At this point
the user can alternatively connect Soda Lime.
3.
The Soda Lime needs to be connected to the inlet and outlet port to create a closed
loop system.
Figure 19: Soda lime closed loop system.
CO2 Span Buffer Tank System Instructions
If access to standardized CO
2
gas is limited, ambient air can be used to calibrate the CO
2
span.
Ambient air should only be used if a buffer tank system is implemented. The buffer tank system
CO2 CALIBRATION
CO2 PPM
CO2 PCT
Summary of Contents for F-900
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