Dwyer Instruments CDT Series Quick Start Manual

North American
Series CDT and CDTR Wall Mount Carbon Dioxide Temperature Transmitters
concentration and temperature in schools, office buildings,
accurately monitor the CO
2
and other indoor environments to help achieve LEED
Series CDTR also measures ambient relative humidity. In order to achieve a higher
level of accuracy, the Series CDT includes digital barometric pressure adjustment.
Universal outputs allow users to select the transmitter output to be 4-20 mA, 0-5 VDC,
or 0-10 VDC to work with virtually any building management controller. An optional
relay with user adjustable set points can be used to control exhaust fans, open
actuated windows or dampers, or signal a light or horn.
For applications that require visual indication, the Series CDT and CDTR can be
ordered with an integral LCD display, Model A-449 or Model A-449A remote LCD
display that can plug into the mini-connector port on the side of the transmitter. Both the
CDT and CDTR can be configured to display temperature only, CO
temperature together. The Series CDTR can also display relative humidity or CO
relative humidity together. Push buttons are standard on the transmitters for access
to the menu structure in models with displays. To prevent tampering, the action of the
buttons can be locked out using an internal dip switch selection. Menu items that can
be accessed include: engineering units, relay output set points, display configuration,
transmitter output scaling, ambient barometric pressure and field calibration of the
transmitter.
The Series CDT and CDTR CO
provides the necessary attributes and parameters to be e with DSA requirements for
monitoring CO levels in schools. There is a front facing LED that illuminates when the
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level exceeds 1100 PPM.
CO
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Automated CO
Baseline Correction (ABC)
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The Series CDT and CDTR CO
with the ability to adjust the CO
intermittently occupied spaces. The ABC algorithm accounts for long term drift by
making small adjustments to it's zero calibration point based on the lowest CO
readings it measures. CO calibration adjustments are made every eight days by the
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ABC algorithm. For environments occupied 24 hours per day it is recommended to
periodically expose the CO
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1.888.610.7664
Series CDT and CDTR Wall Mount Carbon Dioxide/
Temperature Transmitter
Specifications - Installation and Operating Instructions
DSA* compliant option -S
certification. Additionally, the
®
transmitters are available with a -S option that
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transmitters are maintenance free instruments
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calibration by using the on-board ABC logic for
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sensor to outside ambient air.
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SPECIFICATIONS
Sensor: NDIR, 15 year life expectancy.
Range: CO : 0 to 2000 or 0 to 5000 PPM (depending on model); Temperature: 32
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to 122°F (0 to 50°C).
Accuracy**: CO
of reading (5000 PPM CO
humidity output); Temperature: ±1°C @ 25°C.
Response Time: 2 min for 90% step change.
Temperature Limits: 32 to 122°F (0 to 50°C).
Humidity Limits: 0 to 85% (non-condensing).
Power Requirements: 16-35 VDC or 19-28 VAC.
Power Consumption: Average: 2 w; Peak: 3.75 w.
Output: Current: 4-20 mA (max. 500 Ω); Voltage: 0-5 VDC or 0-10 VDC (min. 500
Ω); Relay: SPST NO rated 2A @ 30 VDC; RTD or thermistor per r-t curves on page
4 (depending on model).
only, or CO and
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Compliance: CE.
and
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**The specified CO
operation in environments which are intermittently occupied.
INSTALLATION
CAUTION
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.
NOTICE
NOTICE
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NOTICE
NOTICE
transmitter to adjust to the current CO
NOTICE
days.
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*Division of the State Architect - California
: ±40 PPM + 3% of reading (2000 PPM CO
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); RH: ±2% (10 to 90% RH) (for units configured with
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accuracy is only guaranteed after three weeks of continuous
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Disconnect power supply before installation to prevent electrical
shock and equipment damage.
Use electrostatic discharge precautions (e.g., use of wrist straps)
during installation and wiring to prevent equipment damage.
Avoid locations where severe shock or vibration, excessive
moisture or corrosive fumes are present.
Do not exceed ratings of this device, permanent damage not
covered by warranty may result.
Upon powering the transmitter, the firmware version will flash on
the display. A warm up period of 30 minutes is required for the
concentration.
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Self calibration feature of the transmitter requires exposure to
normal outdoor equivalent carbon dioxide level once every thirty
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); ± 50 PPM + 5%
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