Table of Contents
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S
ELECTING AN
The O
Generator can be set to operate in either of two modes: Constant or Bench.
3
CNST (C
ONSTANT
In Constant mode, the O
voltage, and there is no Feedback loop control by the calibrator's CPU.
BNCH (B
ENCH
In Bench mode, the O
measurement as input. To select a default O
G
F
AS
LOW
The default total gas flow rate for the T750 Portable Calibrator is 2 SLPM. The calibrator
uses this flow rate, along with the concentrations programmed into the calibrator for the
component gas cylinders during set up, to compute individual flow rates for both diluent
gas and calibration source gases in order to produce calibration mixtures that match the
desired output concentrations.
This Total Flow rate may be changed to fit the user's application. Once the flow is changed,
then the new flow value becomes the total flow for all the gas concentration generated and
computes again the individual flow rates of the component gases and diluent accordingly.
Note
The flow rate can be configured in the Setup>Vars menu by editing the Target Flow
parameter.
Note
O
F
THER
ACTORS
The TOTAL FLOW is also affected by the following:
The Generate>AUTO menu (see Section 4.2.1), or
•
•
As part of a Generate step within a sequence (see Table 3-2 and Section 3.3.7).
The operator can individually set both the diluent flow rate and flow rates for the
component gas cylinders as part of the following:
The Generate>MANUAL menu (see Section 4.2.2), or
•
•
As part of a Manual step when programming a sequence (see Table 3-2 and
Section 3.3.7).
50
O
M
PERATING
ODE FOR THE
) M
ODE
output of the generator is based on a single, constant, drive
3
) M
ODE
concentration control loop will use the photometer's O3
3
R
S
ATE
ETUP
The minimum total flow should equal 150% of the flow
requirements of all of the instruments to which the T750 will be
supplying calibration gas.
Example: If the T750 is will be expected to supply calibration
gas mixtures simultaneously to a system composed of three
analyzers, each requiring 2 SLPM, the proper Total Flow output
should be set at: (2 + 2 + 2) x 1.5 = 9.000 SLPM.
It is not recommended that you set the TOTAL FLOW rate to be
<10% or >100% of the full scale rating of the diluent MFC.
A
T
FFECTING THE
OTAL
O
G
ENERATOR
3
generator mode, press
3
F
LOW
083730750B DCN8606
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Troubleshooting
