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Series CDT Carbon Dioxide Transmitter
The materials included in this compilation are for the use of Dwyer Instruments, Inc. potential customers and current employees as a resource only. They may not be reproduced, published, or transmitted electronically for commercial purposes. Furthermore, the Company’s name, likeness, product names, and logos, included within
these compilations may not be used without specific, written prior permission from Dwyer Instruments, Inc. ©Copyright 2011 Dwyer Instruments, Inc
General Specifications
Series CDT Wall Mount Available Now, Duct and OSA Available Summer 2011
Range: 0 to 2000 PPM or 0 to 5000 PPM
Accuracy: +/- 3 % of reading +/- 40 PPM
Output: Field Selectable 0 to 10(5) VDC / 4 to 20 mA for CO2 and Temperature
Optional Passive Temperature Outputs via Separate Terminal Board for Wall Mount
Optional Relay for CO2
General Specifications
Sensor Type: Non-Dispersive Infrared
Single Beam Dual Wavelength Technology
Self Corrects for Drift Due to Light Source
Aging
Field Calibration Using Calibration Kit
(Dwyer Calibration Gas Tanks Available For
Sale in Approved Countries)
NDIR Sensor Technology
NDIR Sensor Technology Single Beam – Single Wavelength
Telaire, Sense Air (ACI, Greystone, Thermokon, and Veris use Telaire or Sense Air Sensor Modules)
Single Light Source and Single Receiver with ABC Logic Self Calibration
Advantages: Lowest Cost Solution
Acceptable Accuracy For Most Applications
Disadvantages: Can’t Calibrate Itself in Buildings Occupied 24hrs / day
Additional Error from Logic 400 PPM Assumption
NDIR Sensor Technology
Dual Beam – Single Wavelength
E+E, Vulcain (Honeywell Owned), Siemens
Two Light Sources and Single Receiver Using
Second Light Source as Reference
Advantages:
Can Self Calibrate In Occupied Buildings
Less Expensive Sensor
Disadvantages:
Doesn’t Account for Aging of Second Light Source
NDIR Sensor Technology
Single Beam – Dual Wavelength Dwyer, Vaisala
Single Light Source With Two Wavelength Filters Where One Filter Monitors the Light and Other Measures CO2
Advantage: Self Calibrates in Occupied Buildings
Calibration Monitors Actual Light Aging Effect
Disadvantage: Most Expensive Of Sensor Technologies
Features and Benefits
Field Calibration with Jumper Lockout
Allows Qualified Users to Adjust Calibration to
Insure Most Accurate Sensor Possible
Eliminates Building Occupants from Mistakenly
Changing Calibration
Field Selectable Outputs
Eliminates Chance of Customer Ordering Incorrect
Models
Allows Transmitter to Work With Most BMS
Controllers
Features and Benefits
Terminal Block On Back Plate Customer Can Change Transmitter Without Requiring Electrician
Back Plate Can Be Installed Without Risk of Transmitter Being Damaged or Lost During Rough In
Local and Remote Display Allow Customer to Access Calibration and Set Up Menus
Can be Configured Not to Display CO2 for Daily Use
Same Remote Display for Whole BAS Wall Mount Family
Features and Benefits
On Board RTD Temperature Sensor Able to View Ambient Temperature on All Models
Large Vents in Housing Along With Placement of Sensor, Creates More Air Flow Across Sensor For Greater Accuracy
Optional Relay Can Turn On Fan In Case CO2 Level Too High
Field Selectable Engineering Units Universal Product Platform for US and Overseas Customers
Features and Benefits
Barometric Pressure Compensation Allows Users Above Sea Level to Correct For Barometric Pressure to Insure Most Accurate Reading
Output Scaling Allows Users to Achieve Greater Resolution by Using a More Custom Temperature and CO2 Range
Push Button Calibration Reduces Time it Takes to Calibrate Transmitters
Low Price
Applications
Carbon Dioxide
Transmitters are
used as an
indication of the
level of
occupancy in a
multiuse room
such as a
conference room
Application
Carbon Dioxide
Transmitters are
commonly used in
schools to insure
enough fresh air is
being supplied to the
classrooms
Applications
Carbon Dioxide
Transmitters are
used in underground
parking Garages in
areas where diesel
engine vehicles are
prevalent
Questions
To order a free catalog or for more information contact;
Dwyer Instruments, Inc., P.O. Box 373,
Michigan City, IN., 46361
Telephone: (800) 872-9141 or (219) 879-8000
Fax: (219) 872-9057
Internet address: www.dwyer-inst.com
E-mail: [email protected]