Sierra C100L-L-DD-LE-5-OV1-SV1-PV1C-V1-S1, Instruction Manual

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Sierra Instruction Manual MaxTrak 180
40
6 Appendix A Gas Tables
6.1 MaxTrak Pre-Programmed Gases: Dial-A-Gas
The following gases have been programmed into the MaxTrak instrument in this order. If you are
using one of these gases, you may use the Dial-A-Gas feature in the Software Package and the
instrument will adjust the outputs automatically.
1. Air
2. Argon
3. CO2
4. CO
5. Helium
6. Hydrogen
7. Methane
8. Nitrogen
9. Nitrous Oxide
10. Oxygen
6.2 K-Factor Calculations-Using MaxTrak with Other Gases
If you will be using MaxTrak with a gas not on this list, you may use the tables below. They
provide K-factors and thermodynamic properties of gases commonly used with mass flow meters
and controllers. This is particularly useful if the actual gas is not a common gas or if it is toxic,
flammable, corrosive, etc. The tables can also be used to interpret the reading of a flow meter or
flow controller that has been calibrated with a gas other than the actual gas.
Before applying the tables, set the instrument for Air. Then, the following fundamental relationship may be used:
Q
1
/Q
N
= K
1
/K
N
Where:
Q = The volumetric flow rate of the gas referenced to normal
conditions of 0°C and 760 mm Hg (sccm or slm),
K = The K-factor from the following tables, referenced to Air
( )
1
= Refers to the “actual” gas, and
( )
N
= Refers to the “reference” gas, Air in this case.