Emerson 210-2000 User Manual
40
Carbon Dioxide Sensor
Carbon Dioxide Sensor
Product Information Sheet
Product Information Sheet
210-2000
Overview
CPC’s CO2 sensor (P/N 210-2000) is a non-dispersive
infrared analyzer designed for measuring
environmental CO
systems and indoor spaces. Its measurement range of
0-2000 or 0-5000 ppm covers the range required to
monitor compliance with ASHRAE and other
ventilation efficiency standards.
An LCD display is available to provide local indication
of CO
calibration process. An adjustable setpoint relay is
available for direct control and alarm applications.
Microprocessor-based digital electronics and a
unique self-calibration algorithm improves long-term
stability and accuracy
concentration and facilitate the setup and
2
concentration in ventilation
2
Mounting
Before mounting, remove the door from the circuit
board by pressing a screwdriver against the locking
tab on the top of the enclosure. Pry the circuit board
Figure 1 - CO2 Sensor (exploded view)
away from the mounting plate using a screwdriver
inserted into the two tab slots on the top of the
enclosure.
Choose a location for the sensor with good air
circulation, away from ventilation inlets, doors,
windows, or other points where fresh air enters the
room. The sensor should be mounted at least 4-1/2
feet above the floor. The environment temperature
must be within 32°–112°F (0°–50°C).
If wiring will be coming in through the mounting
plate from the back, punch out openings in the
mounting plate and use the plate as a template for
locating holes. Mount the mounting plate against a
wall or other flat surface by using the two mounting
holes and the screws provided (use wall anchors for
drywall installations).
NOTE: Sensors must be mounted vertically (straight
up and down) to ensure proper readings.
41
Carbon Dioxide Sensor
Product Information Sheet
210-2000
Wiring
The mounting plate has two sets of three-terminal
connectors. The connector on the left side of the
mounting plate is where sensor power and the signalto-I/O-board connection is made. The connector on
the right side is where connection to the on-board
relay is made.
Power Wiring
The CO2 sensor requires 24VAC power from a noncenter-tapped transformer. The sensor draws a
maximum of 3VA power. CPC recommends P/N 6400039, 10VA, 110VAC non-center-tapped Class 2
transformer.
Wire the transformer secondary to the connector on
the left side of the mounting plate, as shown in Figure
2.
Analog Output Wiring
The middle terminal of the connector on the left side
of the mounting plate is the analog output that
communicates the current CO
the site controller. This connector is typically
connected to a point on an I/O board, such as a 16AI,
16AIe, or 8DO. Wire the middle (SIGNAL) terminal on
the CO
I/O board point. Wire the COMMON terminal on the
CO
board point. See Figure 2.
sensor to the even numbered terminal of the
2
sensor to the odd numbered terminal of the I/O
2
Relay Wiring
The CO2 sensor has an on-board relay that changes
state to indicate a CO
programmed set point. This relay can be used as a
digital input on an input board point, or it can be used
to directly activate or deactivate an alarm
annunciator or a device that controls ventilation.
The connector on the right side of the mounting plate
is a Form C connector for the CO
Connect the input board point or device to the
concentration level to
2
level higher that a
2
sensor relay.
2
middle (COMMON) terminal of this connector, and
either the N.C. or N.O. terminal, depending on
whether you want the relay to be OPEN or CLOSED
when the CO
See Figure 2.
concentration is below the set point.
2
Figure 2 - CO2 Sensor Wiring
Reassembly After Wiring
When you are finished wiring power and I/O to the
connectors on the mounting plate, reconnect the
circuit board to the mounting plate. Push the top end
of the circuit board into the mounting plate so the
two hooked tabs on the circuit board are underneath
the tabs on the mounting plate. Then, gently press
down on the bottom part of the circuit board until it
snaps into place. See Figure 3.
If you have trouble pushing the circuit board in, check
to see if the pins on the back of the circuit board are
properly aligned with the power and relay connectors
on the mounting plate. Also verify that there are no
loose wires getting in the way.
Loading...