F-900 Instruction Manual rev. 1/16/2014
1554 NE 3
rd
Ave, Camas, WA 98607, USA Phone (360) 833-8835 Fax (360) 833-1914
[email protected] http://www.felixinstruments.com
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standardized gas with at least 100 ppm CO
2
, but not over the range of the CO
2
sensor (2000 ppm or
3000 ppm, check the production test check sheet at the end of the manual for CO
2
sensor
information). The recommended standard gas concentration for the high resolution CO
2
sensor is
between 400 and 600 ppm. The recommended concentration for the low resolution CO
2
sensor is
4% CO
2
.
Calibrating the CO
2
sensor with standardized gas is fairly simple.
Remember, to always use a "T"
connection to vent excess gas and prevent damage to the internal components.
1.
Go to Calibration, hit enter, then CO
2
.
2.
Go to Re-calibration and press the right arrow. You will hear the valves open and the
pump begin to run.
3.
Use pressurized N
2
or use soda lime and ambient air to create zero CO
2
gas. When the
gas is flowing or being drawn into the unit, press Enter.
4.
The unit will count down from 49 (HIRES) or 99 (LORES) as it sets the zero for the CO
2
sensor. The humidity, Temperature, and Flow are displayed. The flow should continue
to read 200 mL throughout the calibration- if it does not you may have a leak or
obstructed tube. (Pressing enter at any time will move you into the next step. Only do so
if you want to use the previous zero calibration).
5.
Setup Calibration gas: HIRES: Enter the concentration (in ppm) LORES: Enter the
percent concentration. Use the LEFT/RIGHT arrow keys to switch between
placeholders, and the UP/DOWN arrows to change the values.
6.
Press save to initiate the calibration.
7.
The unit will count down from 49 as it sets the span for the CO
2
sensor. (Pressing enter
at any time will move you into the next step. Only do so if you want to use the previous
span calibration).
8.
After the unit has set the zero and the span for the CO
2
sensor, the Calibration Results
are displayed. Press Save to save the values and return to the Calibration Menu.
Calibration Results
zero
0
span (600) 0000
