Dwyer CDW - Manual

Series CDW Wall Mount Carbon Dioxide/Temperature Transmitter
Specifications - Installation and Operating Instructions
Bulletin E-CDW
The Series CDW Wall Mount Carbon Dioxide/Temperature
Transmitter combines accurate CO
2
measurements with a
passive temperature output. The Non-Dispersive Infrared
(NDIR) sensor continuously updates the calibration through a
proprietary logic feature which limits the amount of error due to
drift. The CDW series is ideal for building automation systems
to help control the fresh air intake in a room.
INSTALLATION
Warning: Disconnect power supply before installation to prevent
electrical shock and equipment damage.
Make sure all connections are in accordance with the job wiring
diagram and in accordance with national and local electrical
codes. Use copper conductors only.
Caution: Use electrostatic discharge precautions (e.g. use of
wrist straps) during installation and wiring to prevent equipment
damage.
Do not exceed the ratings of this device, permanent damage not
covered by warranty may result.
MOUNTING
1. Press the release button on the bottom of the unit in order to
remove the cover as shown in Figure A.
2. Use the appropriate mounting holes and screws to secure the
base unit to the mounting surface.
3. Slide the wires through the wiring slot and make proper wiring
connections per the wiring diagram in Figure B.
DWYER INSTRUMENTS, INC.
Phone: 219/879-8000 www.dwyer-inst.com
P.O. BOX 373 • MICHIGAN CITY, INDIANA 46361, U.S.A. Fax: 219/872-9057 e-mail: [email protected]
SPECIFICATIONS
Range: 0 to 2000 PPM CO
2
.
Accuracy: ±100 PPM @ 22C.
Temperature Dependence: 0.2% FS per C Stability < 2% of
FS mover life of sensor.
Non-linearity: < 1% of FS.
Pressure Dependence: 0.13% of reading per mm of Hg.
Response Time: 3 to 5 minutes for 90% step change.
Ambient Operating Temperature: 32 to 122°F (0 to 50°C).
Storage Temperature: -4 to 158°F (-20 to 70°C).
Power Requirements: 18 - 30 VAC RMS 50/60 Hz, 18 to 42
VDC polarity protected.
Power Consumption: 1.75 VA average 3.25 VA peak.
Sensor: Non-Dispersive Infrared Sensor.
Output: 0 to 10 VDC for CO
2
; 20K Ohm NTC Thermistor for
temperature.
Weight: 0.5 lb (227 g).
Agency Approval: CE.
3-7/32
[81.76]
1-5/64
[27.61]
1-1/4
[31.75]
1-9/32
[32.51]
1/4
[6.35]
19/32
[15.14]
3-35/64
[90.04]
3-31/32
[100.84]
4-5/8
[117.48]
CL
SENSOR
7 PIN
CONNECTOR
THERMISTOR
INTERFACE
CONNECTOR
MOUNTING
HOLES
MOUNTING
HOLES
SLOT FOR
WIRING
LED
Figure A