AP CDD User manual

Automatikprodukter
CO2Duct
Transmitter Jan.08
CDD
Features / Benefits
-CO2gas sensor provides high accuracy in a
compact low cost package
-15 years of experience and reliability built in
-Gold-plated optical CO2sensor increases
sensor life and durability
-Gas permeable, water resistant diffusion filter
prevents particulate and water contamination
of the sensor
-Automatic self calibration software
-No Maintenace and Calibration Required
-Checks and adjusts its´calibration
-Economical and reliable
-Lifetime Calibration Guarantee
Usage
CDW is a carbon dioxide transmitter to be used in
commercial environments.
Typical applications:
•office buildings • restaurants
•conference rooms • gymnasiums
•schools • theaters
•retail stores • movie
CO2based Demand Controlled Ventilation (DCV) allows
for ventilation based on occupancy while still maintaining
ASHRAE recommended per-person ventilation rates.
Over-ventilation of buildings can be reduced, energy can
be saved and air quality can be optimized.
Ordering Code
CDD 10 Duct CO2 Transmitter 0-10Vdc 24Vac
CDD
Technical Data
Method Single Beam Absorption Infrared
flow through sample method
Measurement range 0-2000 ppm
Accuracy ± 50 ppm or 3% of reading@25°C
Sensitivity +/-20ppm
Applications Intended for spaces unoccupied for
at least 4 hours, 2 days a week
Response Time 0-90% <2 minutes(sensor responce)
Warm-Up Time@25°C <2 minutes for full operating accuracy
Non Linearity <1% of FS
Temp.Depence +/-0,15% FS per °C
Operation Conditions +15...+32°C
0-95% RH non-condensing
Power 18-30 Vac RMS, 50/60 Hz-half-wave
recitified(dedicated)
1.75 VA maximum average power
3.25 VA peak power
Analogue output 0-10Vdc (source 100mA, Sink 10mA)
100ohm output impedance
Design Life 15 years typical
Connections 0,75-1 mm2 Removable Screw Term.
1 - Vout (Analogue 0-10Vdc outp.)
2 - Gnd (Ground)
3 - Vin (24Vac (+))
Calibration Interval No Calibration Required
This product meets the demand of CE-approval

Automatikprodukter
CO2Duct
Transmitter Jan.08CDD
CDD Provides Automatic Calibration
The CDD uses ABC Logic (Automatic Background Calibration)
CO2self-calibration system that virtually eliminates the need for
manual calibration in applications where the indoor CO2levels
drops to outside levels during unoccupied periods
(e.g. during evening hours).
ABC Logic is a special software routine in the sensor that
remembers the CO2background readings 14 consecutive
evenings and calculates if there is sensor drift and corrects
for it.
The CDD sensor accuracy staying well within the
+/- 50 ppm accuracy specifications of the sensor.
ABC Logic will not work properly in applications
where the space is unoccupied for less than four
hours a day or where there ar other internal sources
of CO2in the building such as breweries, wineries,
greenhouses or occupational health settings.
How the CDD CO2Transmitter Works
The CO2sensor can detect gases based on the fact that gases
will absorb light at very specific wavelenghts in the infrared
spectrum.
In the CDD sensor, gas diffuses through a gas permeable
membrane allows gas molecules to pass freely but prevents the
entry of particules.
A light source at one end of the chamber generates a broad
band of infrared energy that is directed through the sample
chamber.
Because much of the light bounces off the gold plated walls of
the sensor, alonger effective sample path can be achieved in a
small disance.
At the other end of the sensor is a special optical filter installed
on the top of a light detector.
The optical filter is designed to only admit light at the wavelength
where CO2is known to absorb light.
The small change in light intensity caused by a change in the
CO2concentrations is then measured by the detector and
converted into a CO2measurement by a microprocessor.
The microprocessor also automatically calibrates and corrects
the sensor for long term drift using ABC Logic self calibartion
software.
The figure above shows the results of monotoring three
sensors using ABC Logic over three years.
It shows sensor accuracy staying well within the +/- 50 ppm
accuracy specifications of the sensor.

Automatikprodukter
CO2Duct
Transmitter Jan.08
CDD
Installation
The sensor is comprised of three separate pieces: mounting
plate, sensor pre-mounted on the sensor bottom and the sensor
case top.
Warning
Before performing service or maintenance operations on the
system, turn off main power switches to the unit. Electric chock
can cause personal injury.
Notice
Use of cullular telephones or radio transceivers within 0,5m of
the sensor during calibration process could cause sensor
interference, calibration errors and affect sensor accuracy
Wiring Requirements
The sensor wiring has the following requirements:
1. Power requirements: 18-36Vac RMS 50/60 Hz at 4VA.
2. All system wiring must be in compliance with all applicable
local and national codes.
3. A dedicated power supply is required for this sensor.
4. All sensor wiring should be colour coded for ease of
maintenance and service.
5. Wiring should be 0,75-1mm2stranded wire.
1mm2is recommended.
Mounting the Pitot Tube
1. To mount the pitot tube, drill one 7/8¨ hole through the
duct
2. Insert the pitot tube and mark two remaining holes for
the mounting screws.
3. Punch or drill the two marked holes.
4. Note the direction of airflow in the duct and note the
marking on the pitot tube flange and insert so that it is
properly aligned with the airflow.
5. To ensure an air tight seal, make sure the mounting
surface of the duct is clear of dirt or obstructions.
Then, attach the pitot tube to the duct with sheet metal
screws or riverts.
6. Check the length of the tubing before attaching to the
sensor.
The tubing should connect without stretching or pulling.
If the length is long enough to create a loop or bind the
tubing, it should be shortened.
7. To shorten the tubing, remove the connectors that attach
to the sensor and cut the tubing to length.
8. Replace the tubing connectors by using a twisting or
screwing motion.
Verify the connection is secure.
Note: If the tubing length has been shortened, be sure ¨
the in-line filter is replaced on the pitot tube connector
marked witn an ¨H
9. Complete the installation by screwing the tube
connectors to the input ports on the sensor.
The tubing connectors can be attached to either input
port.
It will not affect the performance of the sensor.
Mounting
The length of the Tygon tubing is 0,75m.
In order to maintain optimmum accuracy, the tubing should
not be lengthened.
If the sensor is mounted closer than 0,7m, the excess tubing
should be shortened to avoid interference with mechanical or
moving devices.

Automatikprodukter
CO2Duct
Transmitter Jan.08CDD
4
We reserve the right to make changes and improvements in our products
which may effect the accuracy of the information contained in this leaflet.
Wiring the Sensor
Perform the following procedure to wire the sensor:
1. Run the wall wiring through the wire hole in the sensor
base.
2. Align the top clips and secure the bottom clips of the
sensor base to the wall mount plate.
3. Gently rock the case from top to bottom, using gently
pressure.
A ”snap” sound will indicate that the sensor is
secure.
4. Separate the wires for 3 wire building communication
system.
5. Remove connectors from the sensor base.
6. Terminate the wires to the connector.
7. Replace the connectors onto the sensor base
8. Push exess wire back throuhg the hole.
Align the sensor top over the sensor base.
Connections
Removable Screw Terminal (0.75 to 1.00 mm2)
1 - VOUT (Analog 0-10 V output)
2 - GND (Ground)
3 - VIN (24 Vac (+))
Sensor Start Up
Perform the following procedure to start up the sensor:
Once the installation is complete, apply power to the sensor.
A two minute warm up will take place.
Measure and read the CO2sensor levels by using a meter or
checking the readings at the attached controller.
Be sure the CO2levels are above the minimum, up to the
maximum acceptable level in the range.
Replace the sensor cover once the test is complete.
Troubleshooting Guide
Symptom
Suspect the sensor is not operating.
Remendy
- Check the voltage between pins Vin and Common.
The voltage should be 18-30Vac RMS or 18-42Vdc
- Ensure that the two pins on the sensor that connect the
3-pin terminal block are not broken, bent or damaged.
- Check the voltage on pins Vout and COM.
The voltage should be between 2 and 10Vdc.
- If there is not an output signal call AP for replacement.
Symptom
Suspect the sensor is out of calibration.
Remendy
- Allow the sensor operate for 14 days and ABC Logic will
bring it to within specification or call AP for replacement
Note:
The CDD sensor cannot be field calibrated.