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Operation
Teledyne Analytical Instruments 50
The value of the upper limit of the currently selected range (AUTO
or MANUAL) affects the voltage and current of the analog outputs on
the rear of the analyzer as well as contact closures indicating which
range is current. The Analog outputs on the rear of the analyzer
represent the proportion of the analysis concentration to the currently
selected range limit.
MANUAL/AUTO RANGE SELECT: In Manual Range select, the
Range indicated on the second line 'Man Rng:' is maintained as the
current range of operation. In Auto Range select, the software
determines the smallest range whose limit is larger than the analysis
concentration.
AUTO RANGE SOURCE: The automatic selection of range can be
set to select according to the THC, SMP, or AVG concentration.
RANGE LIMITS: Ranges may be set as low as 2.0 ppb and as high
as 9999.99 ppm. Range 3 can only be set at a value greater than Range
2. Range 2 can only be set at a value greater than Range 1.
4.4.13 Changing Stream
CHANGE STREAM is not available for standard configurations
of the 4030.
Affects the relay on the rear panel that controls which gas is allowed
to flow to the column and detector.
When the instrument has electronically controlled calibration valves,
the gas stream can be switched here. You can set the incoming gas
source to span, sample (or zero gas, which is nothing more than a 3
rd
source of gas) without entering the calibration mode in order to check
instrument response. During a span calibration, the span stream is
activated. After a span calibration, the stream reverts to whatever was
set before the span. This value is not remembered if the power in cycled
on the unit, the analyzer will default to the analyze stream.