Operation
Settings
Thermo Scientific
42iQLS Instruction Manual
3-85
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 200 ppb and the
high NO analog output set to output concentrations from 0 to 500
ppb.
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–
200 ppb and the high NO range is set to 0–20000 ppb.
●
Auto:
The auto range mode switches the NO, NO
2
, and NO
x
analog
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 200 ppb and the high
range is set to 1000 ppb, as shown below. Sample concentrations below
200 ppb are output based on low range selection and sample
Range Mode Selection
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