Dwyer CDTV Carbon Dioxide Operating Instructions

Series CDTV Duct Mount Carbon Dioxide / Volatile

®

Organic Compound Transmitter

Specications - Installation and Operating Instructions

1/8˝

[3.17]

Ø3-5/16˝

[84.14]

4-25/32˝
[121.44]

4-9/32˝

[108.74]

2-13/16˝

[71.44]

Bulletin AQ-CDTV-D-2

11-49/64˝

[298.85]

Ø1-15/64˝

[31.35]

The Series CDTV Carbon Dioxide / Volatile Organic Compound (VOC) Transmitter
reduces energy cost in buildings by lowering the amount of conditioned air based on
the occupancy of the space. By detecting both CO2 and VOC, the transmitter can
also detect fumes that may need to be exhausted during lower occupancy periods.
Combining both measurements in one transmitter reduces both labor and material
costs by only having to install one CDTV-VOC unit, instead of separate CO2 and VOC
transmitters.

Carbon dioxide measurements are taken using our proven Single-Beam Dual­Wavelength Non-Dispersive Infrared (NDIR) sensor. Our sensor allows users to get
accurate measurements without waiting for the settling / correction periods of other
logic based sensors. Transmitters can be used in buildings and applications that have
24 hour occupancy and can be calibrated on site to match environmental conditions
for improved accuracy.

The VOC measurement is a single value derived from the presence of substances
including alcohols, aldehydes, aliphatic hydrocarbons, amines, aromatic hydrocarbons,
CO, CH4, LPG, ketones, and organic acids. Although a standard unit of measure is

not currently dened, the VOC measurement unit “ppm CO2 equivalent” used by the

device is commonly used in the industry. The VOC measurement does not actually
measure CO2, but instead senses and indicates an air quality value that approximately
correlates perceived comfort levels to similar concentrations of CO2 in the environment.

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

SPECIFICATIONS

Range: CO2: 0 to 2000 or 0 to 5000 PPM (depending on model); VOC: 0 to 2000
PPM CO2 equivalent.

Accuracy: CO2: ±40 PPM +3% of reading.
Temperature Dependence: ±8 PPM / °C at 1100 PPM.

Non-Linearity: CO2: 16 PPM.

Pressure Dependence: CO2: 0.13% of reading per mm of Hg.
Response Time: CO2: 2 min for 99% step change; VOC: 5 min.

Temperature Limits: 32 to 122°F (0 to 50°C).

Power Requirements: 16-35 VDC / 19-28 VAC.
Power Consumption: Average: 2 watts; Peak: 3.75 watts.
Sensor: CO2: Single-beam, dual-wavelength NDIR; VOC: MEMS (metal oxide

semiconductor).
Output: Current: 0-20 mA, 4-20 mA, 0-10 mA, or 2-10 mA (depending on selection

jumper, max 500 Ω); Voltage: 0-10 VDC, 2-10 VDC, 0-5 VDC, or 1-5 VDC
(depending on selection jumper, min 500 Ω); Relay: SPST NO 2A @ 30 VDC.

Weight: 5.6 oz (158.8 g).
Agency Approvals: CE.

INSTALLATION

WARNING

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

CAUTION

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.

DWYER INSTRUMENTS, INC.

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

CAUTION

NOTICE

transmitter to adjust to the current CO2 concentration.

NOTICE

days.

Phone: [phone]

Fax: [phone]

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.

www.dwyer-inst.com

e-mail: [e-mail]

MOUNTING

CONFIGURA

AY

ENTER PUSH BUTTON

OUTPUT SELECTION

URRENTVO

0-20 mA

4-20 mA

0-10 mA

2-10 mA

TURE

POWER

1. Cut hole into duct large enough to insert probe.

2. Attach housing ears to duct using the two self-tapping screws provided.

3. Knock out an opening in the housing and attach an electrical tting to route

electrical wiring. PG11 & PG16 knockouts are molded into the housing.

WIRING

Use maximum 18 AWG wire for wiring to terminals. Refer to Figure 4 for wiring
information.

UP PUSH BUTTON

REMOTE DISPL

CONNECTOR

DOWN PUSH

BUTTON

TION

SWITCHES

Figure 1: Diagram of circuit board

Selection of Current and Voltage Outputs

Prior to wiring, verify that the current/voltage conguration switches (positions 1 and

2) are set to the desired output type. Refer to Figure 1 to locate the conguration

switches. See Figure 2 for diagram of the current/voltage selection switches. For
voltage output selection, the output can be 0-10 VDC, 0-5 VDC, 2-10 VDC or 1-5
VDC. See Figure 3 for the type of voltage output selection switches (positions 3 & 4).

LTAGECURRENT

CO2 CONCENTRATION

Figure 2: Current/Voltage Output

Selection Jumper (PJ1 and PJ2)

0-10 V

2-10 V

Figure 3: Output range selection jumper

TERMINAL

BLOCK

VOLTAGEC

VOC OUTPUT SELECTION

0-5 V

1-5 V

Current / Voltage Outputs

The transmitter may be wired for current or voltage output for both carbon dioxide and
VOC. The transmitter can be powered with either 16-35 VDC or 19-28 VAC. Wire the
transmitter according to Figure 4.

NOTICE

Thermistor and RTD Outputs

Thermistor and RTD passive outputs are located on terminals 7 and 8 and do not
require any power. Passive temperature outputs are not polarity sensitive.

Remote Display

Remote display Model A-449 can be used to display the VOC or 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 VOC or carbon dioxide
measurements.

ACCESSING MENU PARAMETERS

Step 1: To enter the menu structure, press and simultaneously for 5
seconds (display will show RON parameter).

Step 2: Press or to cycle between menu items.

Step 3: Press to edit the value for the displayed menu item (SET will appear
on display).

Step 4: Press or to adjust the value of the menu item.

Step 5: Press to save the changes (SET will disappear).

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

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

During the initial 5 minute warm-up phase, the VOC reading will be 0 ppm or an
indeterminate value. After warming up, the device is operational and note the VOC
output level will be approximately 450 PPM. If the device outputs 0 PPM after the
warm-up, there is either an operational error or a disconnected sensor error and
customer service should be contacted.

Note: Reference menu descriptions for changing factory settings.

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

VOC

SUPPLY

Figure 4: Active output wiring diagram

RECEIVER

CO2

RECEIVER

RELAY
CONTACT

PASSIVE
TEMPERA
SENSOR