Range Mode Selection - Thermo Scientific 42iQHL Instruction Manual

Operation
Settings

Range Mode Selection

3-86 42iQHL Instruction Manual
The Range Mode Selection screen is used to switch between the various
range modes: Single, Dual, and Auto Range.
Home Screen>Settings>Measurement Settings>Range Mode Selection
The Range Mode Selection screen contains the following information:
Single: In single range mode, there is one range, one averaging time,
●
and one span coefficient.
Dual: In the dual range mode, there are two independent analog
●
outputs. These are labeled simply as the "High Range" and the "Low
Range". Each channel has its own analog output range setting,
averaging time, and span coefficient.
This enables the sample concentration reading to be sent to the analog
outputs at two different ranges. For example, the low NO analog
output can be set to output concentrations from 0 to 50 ppm and the
high NO analog output set to output concentrations from 0 to 100
ppm.
In addition to each channel having two ranges, each channel has two
span coefficients. There are two span coefficients so that each range can
be calibrated separately. This is especially necessary if the two ranges are
not close to one another. For example, the low NO range is set to 0–50
ppm and the high NO range is set to 0–1000 ppm.
Auto: The auto range mode switches the NO, NO
●
outputs between high and low range settings, depending on the
concentration level. The high and low ranges are defined in the Range
Settings screen.
For example, suppose the low range is set to 50 ppm and the high
range is set to 100 ppbm, as shown below. Sample concentrations
below 50 ppm are output based on low range selection and sample
concentrations above 50 ppm are output based on high range selection.
, and NO analog
2 x
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