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Teledyne API – Model T700 Dynamic Dilution Calibrator Overview of Operating Modes and Basic Operation
107
4.2.2.2. Determining the Diluent Gas Flow Rate
To determine the required flow rate of the diluent gas use the following formula:
Equation 4-2
-
flowflow
GASTotalflowDIL =
WHERE:
GAS
flow
= source gas flow rate (from Equation 6-1)
Totalflow
= total gas flow requirements of the system
DIL
flow
= required diluent gas flow
EXAMPLE:
If the requirement of the system is 9.000 LPM,
The source gas flow rate is set at 3.00 LPM.
The required source gas flow rate would be:
DIL
flow
= 9.0 LPM – 3.0 LPM
DIL
flow
= 6.0 LPM
4.2.2.3. Determining the Diluent Gas Flow Rate with the Optional O
3
Generator Installed
If the optional O
3
generator is installed and in use, Equation 6.2 will be slightly
different, since the O
3flow
is a constant value and is displayed as a TEST function on the
T700’s front panel. A typical value for O
3flow
is 105 cm
3
/min.
Equation 4-3
flow
flow
OTotalflowDIL
3
= -
WHERE:
GAS
flow
= source gas flow rate (from Equation 6-1)
Totalflow
= total gas flow requirements of the system.
O
3 flow
= the flow rate set for the O
3
generator; a constant value (typically
about 0.105 LPM)
DIL
flow
= required diluent gas flow
EXAMPLE:
If the requirement of the system are 9.000 LPM,
The source gas flow rate is set at 3.00 LPM.
The required source gas flow rate would be:
DIL
flow
= 9.0 LPM – 0.105 LPM
DIL
flow
= 8.895 LPM
Note
It is not recommended to set any flow rate to <10% or >100% of the full scale
rating of that associated mass flow controller.
WITH MULTIPLE CALIBRATIONS MASS FLOW CONTROLLERS INSTALLED:
• The combined flow potential of both mass flow controllers is available with the
following limits: The limits are <10% of the lowest rated MFC or >100% of the
combined full-scale ratings for both mass flow controllers.
• The T700 will automatically select the MFC with the lowest flow rate that can
accommodate the requested flow, thereby affording the most precise flow
control.
• If no single MFC can accommodate the requested flow rate, multiple mass flow
controllers are used.
06873B DCN6388