Manual

Model CDD Duct Mount Carbon Dioxide Transmitter
Specifications - Installation and Operating Instructions
Bulletin E-CDD
DWYER INSTRUMENTS, INC. Phone: [phone] www.dwyer-inst.com
P.O. BOX 373 • MICHIGAN CITY, INDIANA 46360, U.S.A. Fax: [phone] e-mail: [e-mail]
The Model CDD Duct Mount Carbon Dioxide Transmitter monitors
the occupancy in a room by detecting the concentration of carbon
dioxide in the return air duct. The non-dispersive infrared sensing
technology automatically updates the calibration of the transmitter using
a proprietary logic feature which limits the amount of error due to drift.
The Model CDD can measure up to 2000 PPM in duct air flows less than
1500 FPM.
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.
SPECIFICATIONS
Range: 0 to 2000 PPM.
Accuracy: ±40 PPM + 3% of reading @ 22°C.
Temperature Dependence: 0.2% FS per °C.
Stability: < 2% of FS over life of sensor.
Non-Linearity: < 1% of FS.
Pressure Dependence: 0.13% of reading per mm of Hg.
Response Time: 3 minutes typical for 90% step change.
Duct Air Velocity Range: 0 to 1500 FPM (7.63 m/s).
Ambient Operating Temperature: 32 to 122°F (0 to 50°C).
Storage Temperature: -4 to 158°F (-20 to 70°C).
Power Requirements: 18 to 30 VAC RMS 50/60 Hz or 18 to 42 VDC.
Power Consumption: 1.65 watts peak (0.65 watts average at 42
VDC).
Outputs: 0 to 10 VDC.
Housing: Flammability Classification UL rated 94V-5VA.
Weight: 8 oz (230 g).
8
-1/8
[
206.25]
8˝ STYLE PROBE
5-11/16
[144.46]
4-31/32
[126.21]
3-1/16
[77.79]
2X Ø7/32
[2X Ø5.56]
4˝ STYLE PROBE
Ø1-1/4
[Ø31.7]
4-1/8
[104.78]
1
-39/64
[40.88]
4
X KNOCKOUT 1/2˝ CONDUIT HOLE
3-1/32
[77]
1-1/8
[28.58]
AIR FLOW
MODEL CDD
AIR FLOW
CO
2
VENTILLATION
TRANSMITTER
RED: 24V BROWN: VCUT
BLACK: GROUND