Autorange Mode - Thermo Scientific 43i Instruction Manual

Operation
Range Menu

Autorange Mode

3-10 Model 43i Trace Level-Enhanced Instruction Manual
Channel Connector Pin
5 17
6 36
Ground 16, 18, 19, 35, 37
Note All channels are user definable. If any customization has been made
to the analog output configuration, the default selections my not apply.
The autorange mode switches the SO
low ranges, depending on the concentration level. The high and low ranges
are defined in the Range menu.
For example, suppose the low range is set to 50 ppb and the high range is
set to 100 ppb (Figure 3–6). Sample concentrations below 50 ppb are
output based on low range selection and sample concentrations above 50
ppb are output based on high range selection. When the low range is active,
the status output is at 0 volts. When the high range is active, the status
output is at half of full-scale.
When the high range is active, the concentration must drop to 95% of the
low SO range for the low range to become active.
2
In addition, each SO analog output has a span coefficient. There are two
2
span coefficients so that each range can be calibrated separately. This is
necessary if the two ranges are not close to one another. For example, the
low SO range is set to 0–10 ppb and the high SO
2
ppb.
I/O Terminal Pin Description
9 None
11 None
2, 4, 6, 8, 10, 12 Signal Ground
analog outputs between high and
2
range is set to 0–1000
2
▲
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