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Overview of Operating Modes and Basic Operation Teledyne API – Model T700 Dynamic Dilution Calibrator
102
4.2. GENERATE MODE
The Generate Mode allows the user to generate the desired calibration gas mixtures.
The types of gas include NO, NO
2
, SO
2
, CO, HC or ZERO gas based on the source gas
concentration entered during initial setup (see Section 3.4.7). If the unit has an optional
O
3
generator installed, various concentrations of O
3
can be generated as well.
DILUENT
PRESSURE
SENSOR
INPUT GAS
PRESSURE SENSOR
PCA
CAL GAS
PRESSURE
SENSOR
On Back Panel
Instrument Chassis
GAS OUTPUT MANIFOLD
PHOTOMETER
OUTLET
CAL GAS
OUTPUT 2
VENT
CAL GAS
OUTPUT 1
DILUENT
INLET
GAS INPUT MANIFOLD
(on back panel)
Purge
Valve
CAL GAS 1
INLET
CAL GAS 3
INLET
CAL GAS 4
INLET
CAL GAS 2
INLET
Cal Gas
Mass Flow Controller
Diluent
Mass Flow Controller
PHOTOMETER
INLET
EXHAUST
PHOTOMETER
ZERO OUT
PHOTOMETER
ZERO IN
DILUENT
Valve
orn
yel
yel
blu
brn
brn
brn
yel
yel
orn
blu
Figure 4-4: Gas Flow through Basic T700 in GENERATE Mode
Table 4-4 shows the status of the T700’s various pneumatic components when the
calibrator is in GENERATE mode:
Table 4-4: Status of Internal Pneumatics During GENERATE Mode
VALVES
(X = Closed; O = Open)
MFCs
GAS TYPE
CYL
1
CYL
2
CYL
3
CYL
4
PURGE DILUENT GPT
O
3
GEN
PHOT M/R
CAL1 CAL2
1
DILUENT
PHOT
PUMP
Generate
Source Gas
O
2
O
2
O
2
O
2
X O X X
Reference
Phase
ON
3
ON
3
ON OFF
Generate O
3
X
X X X X O X O
Switching
OFF
OFF
OFF 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.
06873B DCN6388