Gas Flow Constant Calibration Worksheet
Follow the instructions for calibrating the analyzer’s Mass Flow Controllers for a given gas. Use worksheet to record measured values and perform calculations included in this process.
Single Gases
MFC being used (optional)
__________ Preparation
__________ Carrier
__________ Analysis (Loop)
Gas: __________________________________________________________________________
- MFC flow rate (as set on instrument schematic): __________________________________
- Measured flow rate (using an external flow meter): _________________________________
- Convert the flow rate to Standard Temperature and Pressure (STP) using the following formula:
- Enter the value from line 3 in the Actual flow field of the Gas Flow Constant Calibration window (Unit [n] > Gas Flow Calibration).
- The new Mass flow constant displays. Enter the Mass flow constant value: __________
- Click Accept.
- Enter the new Conversion Constant for this gas (from line 5) into the Adsorptive Properties (.ADP) file.
Gas Mixtures
A conversion constant for a mixture of gases can be determined using the conversion constants for each gas in the mixture. Use the following formula to calculate the conversion constant for the gas mixture:
where
M | = | mixture conversion constant |
P | = | percentage of gas n in the mixture, expressed as a whole number (example: for 15%, use 15, not .15) |
F | = | conversion constant (factor) for gas n |
Gas Name (n) | Conversion Constant (F) |
---|---|
1. | |
2. | |
3. | |
4. | |
5. | |
6. | |
7. | |
8. | |
9. | |
10. | |
11. | |
12. | |
13. | |
14. | |
15. |
Mixture name: _______________________ Constant (M): _______________________
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