Dwyer CDX - Manual

Bulletin AQ-CDX
The Series CDX Carbon Dioxide Transmitter is a low cost and high
performing CO2 sensor. On-Demand ventilation using CO2 sensors
prevents energy losses from over ventilation while maintaining indoor air
quality. The potential for the greatest energy saving occurs in areas
where occupancy varies over the duration of the day. The Series CDX
Transmitters utilize a proprietary logic algorithm to eliminate the need for
manual calibration in applications where the indoor CO2 level drops to
outside levels during unoccupied periods.
MOUNTING
Push the tabs on the bottom of the housing to remove the cover. Mount
the back plate to the wall or junction box with the supplied screws and
make the necessary wire connections. Attach the cover to the back plate
by aligning the top clips and securing the bottom clips.
SELECTION OF VOLTAGE OUTPUT
Prior to wiring, verify that the voltage selection jumper is set to the
desired output type. For voltage output selection, the output can be 0 to
5 VDC or 0 to 10 VDC. Voltage (see below).
0 to 10 V Jumper Selected (left), 0 to 5 V Jumper Selected (right).
DWYER INSTRUMENTS, INC.
Phone: 219/879-8000 www.dwyer-inst.com
P.O. BOX 373 • MICHIGAN CITY, INDIANA 46360, U.S.A. Fax: 219/872-9057 e-mail: [email protected]
SPECIFICATIONS
Range: 0 to 2000 PPM.
Accuracy: ±30 PPM or 3% of reading, whichever is higher. CO2
accuracy statement excludes standard gas used for calibration that has
an accuracy of 2% and there is a potential digital to analog error of up
to 1%.
Temperature Dependence: 0.2% FS per °C (± 0.11% per °F).
Stability: < 2% of FS over life of sensor (15 years).
Pressure Dependence: .135% of reading per mm of Hg.
Response Time: 5 s.
Warm Up Time: < 2 min (operational), 10 min (max. accuracy).
Temperature Limits:
Operating: 32 to 122°F (0 to 50°C);
Storage: -40 to 158°F (-40 to 70°C).
Humidity Limits: 0 to 95% relative humidity, non-condensing.
Power Requirements: 18 to 30 VAC RMS, 50/60 Hz, or 18 to 42
VDC, polarity protected.
Power Consumption: .7 W @ nominal voltage of 24 VAC RMS.
Sensor: Non-dispersive infrared (NDIR) absorption.
Output: Analog, 0 to 5 V or 0 to 10 V jumper selectable (100 Ω output
impedance), 4 to 20 mA (RL maximum 500 Ω).
Housing: Flammability classification UL94 5VA.
Weight: European Housing: 5.44 oz (154 g); North American Housing:
6.24 oz (177 g).
Agency Approvals: CE, RoHS.
Specifications - Installation and Operating Instructions
Series CDX Wall Mount Carbon Dioxide Transmitter
4-37/64
[116.33]
1-1/64
[25.65]
3-13/64
[81.28]
Ø5/32 x 4
[Ш3.87]
Ш5/32 x 3
[Ш3.87]
3-13/64
[81.28]
1-1/16
[27.18]
3-13/32
[86.36]