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Overview of Operating Modes and Basic Operation Teledyne API – Model T700 Dynamic Dilution Calibrator
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4.2.5. GENERATE PURGE: ACTIVATING THE T700’S PURGE FEATURE
The T700 calibrator’s PURGE feature clears residual source gases and calibration
mixtures gases from the previous generated steps from the instruments internal
pneumatics as well as any external pneumatic lines down stream from the calibrator.
When activated, the PURGE feature:
Opens the Diluent (zero air) inlet valve allowing zero air to flow into the calibrator
form its external, pressurized source;
Adjusts the diluent air mass flow controller (MFC1) to maximum flow;
Adjusts all of the component gas mass flow controllers installed in the calibrator to
maximum flows, 10 SLPM and 100 SCCPM accordingly, to flush out the pneumatic
system of the T700.
The PURGE air is vented through the VENT port of the rear panel of the instrument
(see Figure 3-4).
Table 4-7: Internal Pneumatics During Purge Mode
VALVES
(X = Closed; O = Open)
MFCs
MODE
CYL
1
CYL
2
CYL
3
CYL
4
PURGE DILUENT GPT
O
3
GEN
PHOT
M/R
CAL1 CAL2
1
DILUENT
PHOT
PUMP
PURGE X
X X X O O O O
Switching
ON
3
ON
3
ON ON
1
Only present if multiple cal gas MFC option is installed.
2
The valve associated with the cylinder containing the chosen source gas is open.
3
In instrument with multiple MFCs the CPU chooses which MFC to use depending on the target gas flow requested.
O3 Generator Assembly
On Back Panel
orn
yel
grn
brn
blk
red
blu
blu
blk
red
gry
wht
vio
vio
grn
brn
brn
orn
yel
yel
yel
gry
wht
Figure 4-9: Gas Flow through T700 with O
3
Options when in PURGE mode
06873B DCN6388