Dual Range Mode; Pin-Out Of Rear Panel Connector In Dual Range Mode - Thermo Scientific 49i Instruction Manual

Operation
Range Menu

Dual Range Mode

3-10 Model 49i Instruction Manual
In the dual range mode, there are two independent channels defined for
each compound being measured. These are labeled simply as the "High
Range" and the "Low Range". Each channel has its own analog output
range, averaging time and span coefficient.
This enables the sample concentration reading to be sent to the analog
outputs using two different ranges. For example, the low O
can be set to output concentrations from 0 to 50 ppb and the high O
analog output set to output concentrations from 0 to 200 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 necessary if the two ranges are not close to one
another. For example, if the low O
O range is set to 0–1,000 ppb.
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By default, in the dual range mode, the analog outputs are arranged on the
rear panel connector as shown in Figure 3-5. See Table 3-3 for channels and
pin connections. Dual range mode may be selected from the "Range Mode
Select" in the "Service Menu", later in this chapter.
Figure 3-5. Pin-Out of Rear Panel Connector in Dual Range Mode
range is set to 0–50 ppb and the high
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analog output
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