Operation
Range Menu
3-10 Model 48i Instruction Manual Thermo Electron Corporation
Dual Range Mode 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, 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, each CO analog output has a span coefficient. 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, the
low CO range is set to 0–50 ppm and the high CO range is set to 0–10,000
ppm.
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
“Single/Dual/Auto Select” in the “Service Menu,” later in this chapter.
Figure 3-5. Pin-Out of Rear Panel Connector in Dual Range Mode
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