Carbon Dioxide Sensor
Product Information Sheet
210-2000
Span
The Span parameter determines whether you want to
measure concentrations between 0-2000 ppm or 0-
5000 ppm. If set to 2000 ppm, the sensor’s analog
output signal will be scaled properly so that the
highest output voltage corresponds to 2000 ppm.
Likewise, if set to 5000 ppm, the highest output
voltage will signify 5000 ppm. Press ENTER to save
settings.
Output
The Output parameter determines whether you want
the analog output voltage to vary from 0- 5VDC or
from 0-10 VDC. This parameter must be set to 0-
5VDC if the analog output is connected to an I/O
board’s input point. Press ENTER to save settings.
Replacing the Door
Once all programming and wiring is done, the sensor
is ready for operation. Snap the door on to the front
of the circuit board to complete installation. The
sensor comes equipped with two doors: one with a
window that allows the screen to be shown, and one
with no window that covers the screen. Choose
whichever door is appropriate for your site.
Setting Up The Sensor
Type in Einstein and
REFLECS Controllers
The analog output of the CO
2
sensor is a linear 0-
5VDC signal, with 0V representing a concentration of
0 ppm, and 5V representing the maximum
concentration level (either 2000 ppm or 5000 ppm,
depending on the value of the Span parameter you
chose when setting up the sensor).
In order for Einstein and the REFLECS line of
controllers (RMCC, BEC, or BCU) to read the signal
from the CO
2
sensor, it must be set up under Sensor
Control (for REFLECS) or the Analog Input Setup
Screen (for Einstein) as a Linear sensor. Refer to your
controller’s user manual for more information on the
Linear sensor type and how to program its
parameters.
When setting up the sensor in Einstein or REFLECS,
you will need to include the following information:
Gain: The Gain is the number that will be multiplied
with the number of volts coming from the CO
2
sensor’s analog output to yield the concentration
value. If the sensor’s Span is set to 5000 ppm, use a
Gain value of 1000. If the Span is set to 2000 ppm,
use a Gain value of 400.
Offset: Because all calibration is handled by the
sensor itself, the CO
2
sensor’s offset should be set to
zero.
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