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Teledyne API – Model T700 Dynamic Dilution Calibrator Getting Started
67
See Figure 3-4 for the location of these fixtures.
Note
The EXHAUST line must be vented to atmospheric pressure
using maximum of 10 meters of ¼” PTEF tubing. This venting must be outside
the shelter or immediate area surrounding the instrument.
MULTIPLE CALIBRATION SOURCE GAS MFC’S
An optional third mass flow controller can be added on the calibration gas stream.
When this option is installed the T700 has both calibration gas MFCs on the same gas
stream, installed in parallel (see Figure 3-24 and Figure 3-25). The calibrator turns on
the MFC with the lowest flow rate that can accommodate the requested flow and can
therefore suppl
y the most accurate flow control. When a flow rate is requested that is
higher than the highest rated MFC (but lower than their combined maximum flow
rating), both controllers are activated.
EXAMPLE:
Calibrator with one calibration gas MFC configured for 0-5 LPM:
Maximum gas flow = 5 LPM
Minimum gas flow = 500
cm
3
/min
Calibrator with two calibration gas MFCs configured for 0-1 LPM and 0-5 LPM:
Calibration gas flow rates:
5.001 to 6.000 LPM; both MFCs active
1.001 LPM – 5.000 LPM; High MFC active;
0.100 LPM – 1.000 LPM; Low MFC active
When this option is installed the test measurements that show the MFC actual and target
flows (e.g., ACT CAL; TARG CAL) show the sum of the flows of all the active MFCs.
On the other hand, the pressure test measurements show the pressure for only one MFC,
not the sum as it is assumed that gas pressure is the same for all MFCs.
06873B DCN6388