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Overview of Operating Modes and Basic Operation Teledyne API – Model T700 Dynamic Dilution Calibrator
106
4.2.2. GENERATE MAN: GENERATING CALIBRATION MIXTURES
MANUALLY
This mode provides complete the user with more complete control of the gas mixture
process. Unlike the AUTO mode, MAN mode requires the user set the both the
component gas flow rate and diluent airflow rate. This allows the user control over the
mixing ratio and total calibration gas flow rate.
In addition, if the T700 calibrator is equipped with the optional O
3
generator and O
3
is to
be included in the calibration mixture (e.g. using the GPT or GPTPS features), the user
also needs to set the ozone generator mode and set point.
The TOTAL FLOW is defined by the user depending on system requirements.
Note
• 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
4.2.2.1. Determining the Source Gas Flow Rate
To determine the required flow rate of the component source gas use the following
formula
Equation 4-1
i
f
flow
C
TotalflowC
GAS
×
=
WHERE:
C
f
= target concentration of diluted gas
C
i
= concentration of the source gas
GAS
flow
= source gas flow rate
EXAMPLE:
A target concentration of 200 ppm of SO
2
is needed.
The Concentration of the SO
2
Source is 600 ppm
The requirement of the system are 9.000 LPM
The required source gas flow rate would be:
GAS
flow
= (200 ppm x 9.000 LPM) ÷ 600 ppm
GAS
flow
= 1800.000 ppm/LPM) ÷ 600 ppm
GAS
flow
= 3.000 LPM
06873B DCN6388