AirSense Model 310en Operator’s Manual
connection will not damage the unit, but will make it
inoperable until the connection is reversed.
Signal Output
The Model 310en provides either a 0 - 10 volt or a 4 - 20 mA
current loop output at the two terminals of the analog output
connector. The type of analog output is determined by the
setting of the analog output selector.
The unit is shipped from the factory with the top-of-scale set
to 2000 ppm. See the Analog Top-of-Scale Adjustment
section on page 9to change the analog output range limits.
The analog output of the Model 310en is completely isolated
from the power supply. The common outputs of multiple
units can be connected together with no interaction
regardless of power supply hook-up.
Voltage
When the two bottom pins of the analog output selector are
connected with the shorting block, a voltage output appears
at the terminals marked ANALOG OUTPUT. The output
voltage increases linearly with CO2concentration from 0
volts at 0 ppm to 10 volts at the top-of-scale concentration.
Current
When the two top pins of the analog output selector are
connected with the shorting block, a current output appears
between the two terminals marked ANALOG OUTPUT.
The output current increases linearly from 4 mA at 0 ppm to
20 mA at the top-of-scale concentration. The unit is shipped
from the factory with the top-of-scale set to 2000 ppm. See
the Analog Top-of-Scale Adjustment section on page 9to
change the top-of-scale value.
If the total resistance between the two terminals exceeds the
specified maximum loop resistance, the output current may
be erroneously low at high concentrations.
3/9/15 Digital Control Systems Page: 6
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