Generate>Gptps: Performing A Gpt Pre-Set (To Be Run After Gptz And Prior To Gpt); Table 4-4. Status Of Internal Pneumatics During Generate  Gptps Mode - Teledyne T750 User Manual

G
ENERATE
AND PRIOR TO
The GPT Pre-Set (GPTPS) feature simulates a GPT mixing operation in order to determine
the exact output of the calibrator's O
things being equal, the concentration of the NO
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
the O generator is shunted through the T750's internal photometer, which measures the
3
ACTUAL O
Once the exact O
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.
Note
In order to keep the resulting concentration of O
simulated, the instrument's software adjusts the flow rate of the diluent gas to substitute 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 T750's internal pneumatic components
and internal gas flow when the instrument is in GPTPS generating mode.
Table 4-4. Status of Internal Pneumatics During GENERATE  GPTPS Mode
MODE
GPTPS
1 Only present if multiple cal gas MFC option is installed.
2 Present with O
3 Present with photometer option.
083730750B DCN8606
>GPTPS: P
ERFORMING A
GPT)
3
used. Therefore, the more accurately the O
3
output will be.
2
in normal GPT mode. The resulting unaffected O
3
concentration in the gas.
3
concentration being output by the generator is determined, the
3
drive voltage up or down so that the output of the
3
The T750 has a learning algorithm during the O
(see Section 4.2) or Gas Phase Titration Pre-Set Mode
(GPTPS). 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 generator and GPTPS).
3
This adjustment is only valid for the O
during the Pre-Set operation. GPT Pre-Sets must be re-run for
each different target NO
VALVES
(X = Closed; O = Open)
(D = Deenergized; E = Energized
CYL DILUENT
GPT
GEN
IN IN
X O E
generator option.
3
GPT P -S (
RE ET TO BE RUN AFTER
generator. As described in Section 4.2.3.2, all other
being generated by the GPT feature will
2
concentration used
3
value.
2
consistent with the GPT mixture being
3
MFCs
O PHOT
3
CAL1 CAL2
2, 3
M/R 1
E
OFF OFF
Switching
GPTZ
generator
3
output of
3
generation
3
PHOT
PUMP
3
1 DILUENT
ON ON
93