R36US0002EU0100 Rev 1.00
Page 9
Aug 26, 2021
RTD120D-EVK Evaluation Kit Software Manual
3. Follow the steps using the GUI.
So other than the method of determining when the raw value has stabilized and for accepting and storing those
values, the procedure is very similar to that used with the LCD and switches. Using the GUI, the detailed
procedure is as follows (for each of the three (or four) calibration points of CO
2
concentration):
1. Apply the calibration gas mixture (or outdoor air if that is being used for the 400ppm sample) using
one
of the
following methods:
▪ Place the kit in an enclosure (gas chamber, plastic bag, etc.) containing the respective concentration of
CO
2
gas.
▪ Connect a supply hose from a calibration gas canister flowing at approximately 3 liters per minute, to a
fitting that guides the flow of gas into one of the holes at the top edge of the kit’s aluminum gas chamber.
▪ Place the kit in a location where the ambient gas is the gas with the known CO
2
(such as outdoor air).
Establishing a Connection with the EVK
).
Table 1. Calibration Steps (GUI)
Step
Button to “accept” raw value or
save all results
Note
Determine the “raw” value for Zero gas (N).
Mandatory (
typically pure Nitrogen
)
Determine the “raw” value for CO2
(1000ppm).
Calibration gas
Determine the “raw” value for CO2 (400ppm)
Calibration gas or outdoor air
Determine the “raw” value for CO2
(2000ppm)
Calibration gas
(optional step)
Save all “raw” values to flash.
