Dwyer Instruments CDT-2W44-LCD, CDTR-2W4A4-LCD Installation And Operating Instructions Manual

Series CDT and CDTR Wall Mount Carbon Dioxide/

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Temperature Transmitter

Specications - Installation and Operating Instructions

Bulletin AQ-CDT/CDTR-W

Series CDT and CDTR Wall Mount Carbon Dioxide Temperature Transmitters
accurately monitor the CO
and other indoor environments to help achieve LEED

Series CDTR also measures ambient relative humidity. For increased sensor life,
a single- beam dual-wavelength non-dispersive infrared (NDIR) sensor is used to
automatically correct the measurement in both occupied and unoccupied buildings
against aging effects. The single-beam dual-wavelength sensor technology provides
the highest level of accuracy compared to Automatic Baseline Correction methods,
which can unintentionally shift the calibration based on CO
pressure conditions. In order to achieve a higher level of accuracy, the Series CDT
includes digital barometric pressure adjustment and the ability to eld-calibrate the
sensor.

Universal outputs allow users to select the transmitter output to be 4 to 20 mA, 0 to
5 VDC, or 0 to 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 or the Model A-449 remote LCD display that can plug into
the mini-connector port on the side of the transmitter. Both the CDT and CDTR can be
congured to display temperature only, CO

The CDTR can also display relative humidity or CO

Push buttons are standard on the transmitters for access to the menu structure, but
the transmitter can be ordered without the buttons. To prevent tampering, the action of
the buttons can be locked out using an internal jumper selection. Menu items that can
be accessed include: engineering units, relay output set points, display conguration,
transmitter output scaling, ambient barometric pressure and eld calibration of the
transmitter.

2 concentration and temperature in schools, ofce buildings,

2 only, or CO2 and temperature together.

®

certication. Additionally, the

2 levels and barometric

2 and relative humidity together.

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SPECIFICATIONS
Range: CO

units congured with humidity output); Temperature: 32 to 122°F (0 to 50°C);
Accuracy: ±40 ppm +3% of reading; RH: ±2% (for units congured with humidity
output); Temperature: ±1°C @ 25°C.

Temperature Dependence: ±8 ppm / °C at 1100 ppm.
Non-Linearity: 16 ppm.
Pressure Dependence: 0.13% of reading per mm of Hg.
Response Time: 2 minutes for 99% step change.
Temperature Limits: 32 to 122°F (0 to 50°C).
Humidity Limits: 10 to 95% RH (non-condensing).
Power Requirements: 16 to 35 VDC / 19 to 28 VAC.
Power Consumption: Average: 2 watts; Peak: 3.75 watts.
Sensor: Single-beam, dual-wavelength NDIR.
Output: Current: 4 to 20 mA (max 500 Ω); Voltage: 0 to 5 VDC or 0 to 10 VDC

(min 500 Ω); Relay: SPST NO 2A @ 30 VDC; RTD or thermistor per r-t curves
(depending on model).

Weight: 5.6 oz (158.8 g).

INSTALLATION

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.

2: 0 to 2000 or 0 to 5000 ppm (depending on model); RH: 0 to 100% (for

WARNING

CAUTION

1-13/32

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.

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Single-beam dual-wavelength sensor advantages:

• Automatically corrects for aging effects in occupied and unoccupied buildings
◦ Perfect for hospitals and manufacturing plants that are occupied 24 hours per day

• Measures actual unltered light intensity directly
◦ Eliminates error from incorrect assumptions of gas concentration in theoretical
logic assumption methods

DWYER INSTRUMENTS, INC.

P.O. BOX 373 • MICHIGAN CITY, INDIANA 46360, U.S.A.

CAUTION

CAUTION

NOTICE

transmitter to adjust to the current CO

NOTICE

days.

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 rmware version will ash on
the display. A warm up period of 30 minutes is required for the

Self calibration feature of the transmitter requires exposure to
normal outdoor equivalent carbon dioxide level once every thirty

LEED® is a registered trademark of the U.S. Green Building Council

Phone: [phone]

Fax: [phone]

2 concentration.

www.dwyer-inst.com

e-mail: [e-mail]

TURE

POWER

TEMP OR RH

HINGE

COVER

TO REMOVE COVER

PJ2

PJ5

CURRENT

VOLTAGE

CCVV

4 to 20 mA

0 to 20 mA

0 to 10 mA

2 to 10 mA

APPLY PRESSURE TO
BOTTOM TAB WHERE
INDICATED AND THE
TWO PARTS WILL
BECOME UNHINGED
AT TOP

REVERSE PROCESS
TO APPLY COVER

BOTTOM TAB

Figure 1: Removal Of Cover From Back Plate

MOUNTING

1. Push tab on bottom of cover and lift cover from back plate (See Figure 1).

2. Select the mounting location, away from diffusers, lights or any external inuences.

3. Mount transmitter on a vertical surface to a standard electrical box using the two
#6 M2C type screws provided.

4. Pull wires through sub base hole and make necessary connections.

5. Reattach cover to base plate.

WIRING

Use maximum 18 AWG wire for wiring to terminals. Refer to Figure 5 for wiring
information.

PJ4

MOUNTING

SCREWS

SELF-LATCHING

PJ1

MOUNTING
BACK PLATE

Current / Voltage Outputs
On the CDT, the transmitter may be wired for current or voltage output for both carbon
dioxide and temperature. On the CDTR, the transmitter may be wired for current or
voltage output for both carbon dioxide and humidity. The transmitter can be powered
with either 16 to 35 VDC or 19 to 28 VAC. Wire the transmitter according to Figure 5.

NOTICE

Remote Display

For models that are ordered without an integral LCD display, remote display Model
A-449 can be used to display the temperature, humidity, and carbon dioxide. The mini
USB plug of the remote display plugs into the receptor on the side of the housing.
After a short warm up time, the display will begin to show the current temperature and
carbon dioxide measurements unless congured by the user to show humidity and
carbon dioxide, only temperature, only humidity, or only carbon dioxide.

EDITING MENU PARAMETERS

Optional relay can be used as either a dry contact or low voltage
switched circuit up to 2 A at 30 VDC.

SUPPLY

Figure 5: Active Output Wiring Diagram

RECEIVER

CO2

RECEIVER

RELAY
CONTACT

PASSIVE
TEMPERA
SENSOR

Figure 2: Diagram Of Circuit Board

Selection of Current and Voltage Outputs

Prior to wiring, verify that the current/voltage selection jumpers (PJ1, PJ2, and PJ5)
are set to the desired output type. Refer to Figure 2 to locate the selection jumpers.
See Figure 3 for diagram of the current/voltage selection jumper. For voltage output
selection, the output can be 0 to 10 VDC, 0 to 5 VDC, 2 to 10 VDC or 1 to 5 VDC. See
Figure 4 for the type of voltage output selection jumper (PJ5).

OUTPUT

0 to 5 V

2 to10 V

OUTPUT

Figure 3: Current/Voltage Output

Selection Jumper (PJ1 and PJ2)

0 to 10 V

Figure 4: Output Range Selection Jumper (PJ5)

1 to 5 V

ENABLED

MENU MENU

PJ4

OFFON

Figure 6: Menu Lockout Jumper

Before any adjustment can be made to the transmitter, the Menu Lockout Jumper
(PJ4) must be set to the ˝On˝ position (See Figure 6).

ACCESSING MENU PARAMETERS

Step 1: To enter the menu structure, press
seconds (display will show RON parameter).

Step 2: Press

Step 3: Press
display).

Step 4: Press

Step 5: Press

Step 6: Repeat Steps 2 through 5 for each of the parameters.

Step 7: To exit the menu at any time, press and hold
for 5 seconds or wait 10 seconds without pushing any buttons.

or to cycle between menu items.

to edit the value for the displayed menu item (SET will appear on

or to adjust the value of the menu item.

to save the changes (SET will disappear).

DISABLED

PJ4

OFF

ON

and simultaneously for 5

and simultaneously