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Overview of Operating Modes and Basic Operation
4.2.3.3. Determining the TOTAL FLOW for GPT Calibration Mixtures
Note
110
The total flow rate is defined by the user depending on system requirements.
The minimum total flow should equal 150% of the flow requirements of all of the
instruments to which the T700 will be supplying calibration gas.
EXAMPLE:
If the T700 is will be expected to supply calibration gas mixtures simultaneously
to a system in composed of three analyzers each requiring 2 LPM, the proper
Total Flow output should be set at:
(2 + 2 + 2) x 1.5 = 9.000 LPM
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 full combined flow potential of both mass flow controllers is available to
use 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.
Given this information, the T700 calibrator determines the NO gas flow by the formula:
NO
GAS
WHERE:
C
= target concentration for the NO
NO2
C
= concentration of the NO gas input
NO
NO GAS
flow
And the diluent (zero air) gas flow by the formula:
DIL
=
Totalflow
flow
WHERE:
GAS
= source gas flow rate (from Equation 6-1)
flow
Totalflow = total gas flow requirements of the system.
O
= the flow rate set for the O
3 flow
(typically about 0.105 LPM)
DIL
= required diluent gas flow
flow
Teledyne API – Model T700 Dynamic Dilution Calibrator
C
×
Totalflow
NO
2
=
flow
C
NO
= NO source gas flow rate
-
NO
GAS
flow
generator; a constant value
3
output
2
-
O
3
flow
Equation 4-5
Equation 4-6
06873B DCN6388
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