Generate > Gptps: Performing A Gas Phase Titration Pre-Set; T700 Calibrator Gptps Operation; Table 4-6: Status Of Internal Pneumatics During Generate > Gptps Mode - Teledyne T700 Operation Manual

Teledyne API – Model T700 Dynamic Dilution Calibrator
4.2.4. GENERATE > GPTPS: PERFORMING A GAS PHASE TITRATION
PRE-SET
Note The T700 has a learning algorithm during the O
Gas Phase Titration Pre-Set Mode (GPTPS) (Sections 4.2.3.5 and 4.2.4). It may
take up to one hour for each new concentration/flow (point) that is entered into
the instrument. Once the instrument has several points memorized in its cache,
any new point that is entered will automatically be estimated within 1% error
(with photometer) and 10% error (with O
Note
This adjustment is only valid for the O
operation. GPT Presets must be re-run for each different target NO

4.2.4.1. T700 Calibrator GPTPS Operation

Table 4-6: Status of Internal Pneumatics During GENERATE > GPTPS Mode
MODE
CYL CYL
1 2
GPTPS X X
1
Only present if multiple cal gas MFC option is installed.
2
The valve associated with the cylinder containing NO source gas is open.
3
In instrument with multiple MFCs the CPU chooses which MFC to use depending on the target gas flow requested.
06873E DCN7106
The GPT Pre-Set feature simulates a GPT mixing operation in order to determine the
exact output of the calibrators O
things being equal, the concentration of the NO
will be equal to the amount of O
performs the more accurate the NO
When operating in GPTPS mode diluent gas (zero air) is substituted for the NO gas that
would be mixed with the O
generator is shunted through the T700‟s internal photometer, which measures
of the O
3
the ACTUAL O concentration in the gas.
3
Once the exact O concentration being output by the generator is determined, the
3
calibrator‟s software adjusts the O
generator matches as closely as possible, the target concentration requested. This
adjusted generator setting will be used during any subsequent real GPT operation.
In order to keep the resulting concentration of O
simulated, the instrument‟s software adjust the flow rate of the diluent gas to substitutes
an amount of diluent gas equal to the amount of NO gas that would normally be used.
The following table and figures show the status of the T700‟s internal pneumatic
components and internal gas flow when the instrument is in GPTPS generating modes.
VALVES
(X = Closed; O = Open)
CYL CYL
PURGE
3 4
X X X
Overview of Operating Modes and Basic Operation
generator. As described in Section 4.2.3.1, all other
3
2
used. Therefore, the more accurately the O
3
output will be.
2
in normal GPT mode. The resulting unaffected O
3
drive voltage up or down so that the output of the
3
generator and GPTPS).
3
concentration used during the Pre-Set
3
3
O
3
DILUENT GPT PHOT M/R
GEN
O O O Switching
being generated using the GPT feature
generation (see Section 4.2) or
3
value.
2
consistent with the GPT mixture being
MFCs
1
CAL1 CAL2 DILUENT
OFF OFF
generator
3
output
3
PHOT
PUMP
ON ON
109