Calibration Gas Setup - Teledyne T750 User Manual

C
ALIBRATION
The T750 calibrator can accept up to four different user defined gases. This allows using:
Less common component gases not included in the T750's default list;
•
More than one bottle of the same gas but at different concentrations. In this case,
•
different user-defined names are created for the different bottles of gas.
EXAMPLE: Two bottles of CO
User defined gas names are added to the T750's gas library and will appear as choices
during the various calibrator operations along with the default gas names listed in the
interface.
In its default state, the T750's four user-defined gases are named USR1, USR2, USR3 and
USR4, each with a default MOLAR mass of 28.890 (the MOLAR mass of ambient air).
All four are enabled.
To define a user gas you must first define the GAS NAME and then set the MOLAR MASS
through the Setup>Gas>Cylinder>User Gases menu.
S
ETTING THE
The molar mass of a substance is the mass, expressed in grams, of 1 mole of that specific
substance. Conversely, one mole is the amount of the substance needed for the molar mass
to be the same number in grams as the atomic mass of that substance.
EXAMPLE: The atomic weight of Carbon is 12.011 therefore the molar mass of
Atomic weights can be found on any Periodic Table of Elements.
To determine the Molar mass of a gas, add together the atomic weights of the elements that
make up the gas.
EXAMPLE: The chemical formula for Propane is C
Note
D
EFINING THE
To define the source gas, navigate to the Setup>Gas>Cylinder>Port menu and click the
appropriate button to select the gas name (default ZERO) and to configure its concentration
and units.
083730750B DCN8606
G S
AS ETUP
2
different CO calibration gases at the same flow rate.
2
Since identical names must not be assigned to two different bottles,
one bottle can be programmed using the default name "CO2" and
the other bottle programmed by assigning a user defined name such
as "CO2A".
Alternatively, both bottles can be assigned user defined names; e.g.
CO2A and CO2B
M M
OLAR ASS
Carbon is 12.011 grams, conversely, one mole of carbon equals the
amount of carbon atoms that weighs 12.011 grams.
mass of propane is:
(12.011 x 2) + (1.008 x 8) = 24.022 + 8.064 =
If the contents of the bottle are predominantly N
mass of N (28.01).
2
C S G
ALIBRATION OURCE
are being used, allow the calibrator to create two
H . Therefore, the molecular
2 8
AS
32.086
, use the molar
2
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