AirSense
Model 310en Operator’s Manual
Analog Top-of-Scale Adjustment
This section refers to advanced features of the Model 310en.
2000 ppm full scale users need not perform this adjustment.
Unless explicitly ordered otherwise, the Model 310en ships
from the factory set for an analog output range of 0 to 2000
ppm.
The top-of-scale concentration (i.e. the concentration at
which the analog output is at its maximum value) can be
adjusted between 500 and 5000 ppm.
To change the top-of-scale value use the following
procedure:
1.
Record whether the shorting block at jumper JP5
is covering both pins or only a single pin
, then
borrow the shorting block and slide it over the two
pins of jumper JP4 (see Figure 2 on page 5).
2. If the display is present it will show the current top-
of-scale value in ppm.
If there is no display the current top-of-scale value is
indicated by the analog output at a scaling of 500
ppm/volt.
3. Use the ‘UP’ and ‘DOWN’ buttons to adjust the top-
of-scale to the desired value. A top-of-scale setting
of 5000 ppm corresponds to an output voltage of 10
volts.
4. Remove the shorting block from JP4 to save the
value, and restore the shorting block to its original
position on JP5.
3/9/15
Digital Control Systems
Page:
9
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503/246-8110
