Range Mode Selection - Thermo Scientific 48iQTL Instruction Manual

Range Mode Selection

Thermo Scientific
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 CO analog
output can be set to output concentrations from 0 to 50 ppm and the
high CO analog output set to output concentrations from 0 to 100
ppm.
In addition, when in dual or auto range mode, each CO analog output
has a span coefficient 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 CO range is set to 0–50 ppm and the
high CO range is set to 0–1000 ppm.
Auto: The auto range mode switches the CO analog outputs between
●
high and low range settings, depending on the concentration level. The
high and low ranges are defined in the Range Settings menu.
For example, suppose the low range is set to 50 ppm and the high
range is set to 100 ppm. 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. When the low range
Operation
Settings
48iQTL Instruction Manual 3-69