Dwyer Instruments CDX Series Supplement

Bulletin AQ-CDX

The Series CDX Carbon Dioxide Transmitter is a low cost and high

performing CO2 sensor. On-Demand ventilation using CO2 sensors

prevents energy losses from over ventilation while maintaining indoor air

quality. The potential for the greatest energy saving occurs in areas

where occupancy varies over the duration of the day. The Series CDX

Transmitters utilize a proprietary logic algorithm to eliminate the need for

manual calibration in applications where the indoor CO2 level drops to

outside levels during unoccupied periods.

M UNTING

Push the tabs on the bottom of the housing to remove the cover. Mount

the back plate to the wall or junction box with the supplied screws and

make the necessary wire connections. Attach the cover to the back plate

by aligning the top clips and securing the bottom clips.

SELECTI N F V LTAGE UTPUT

Prior to wiring, verify that the voltage selection jumper is set to the

desired output type. For voltage output selection, the output can be 0 to

5 VDC or 0 to 10 VDC. Voltage (see below).

0 to 10 V Jumper Selected (left), 0 to 5 V Jumper Selected (right).

DWYER INSTRUMENTS, INC.

Phone: 219/879-8000 www.dwyer-inst.com

P. . B X 373 • MICHIGAN CITY, INDIANA 46360, U.S.A. Fax: 219/872-9057 e-mail: [email protected]

SPECIFICATI NS

Range: 0 to 2000 PPM.

Accuracy: ±30 PPM or 3% of reading, whichever is higher. CO2

accuracy statement excludes standard gas used for calibration that has

an accuracy of 2% and there is a potential digital to analog error of up

to 1%.

Temperature Dependence: 0.2% FS per °C (± 0.11% per °F).

Stability: < 2% of FS over life of sensor (15 years).

Pressure Dependence: .135% of reading per mm of Hg.

Response Time: 5 s.

Warm Up Time: < 2 min (operational), 10 min (max. accuracy).

Temperature Limits:

Operating: 32 to 122°F (0 to 50°C);

Storage: -40 to 158°F (-40 to 70°C).

Humidity Limits: 0 to 95% relative humidity, non-condensing.

Power Requirements: 18 to 30 VAC RMS, 50/60 Hz, or 18 to 42

VDC, polarity protected.

Power Consumption: .7 W @ nominal voltage of 24 VAC RMS.

Sensor: Non-dispersive infrared (NDIR) absorption.

utput: Analog, 0 to 5 V or 0 to 10 V jumper selectable (100 Ω output

impedance), 4 to 20 mA (R maximum 500 Ω).

Housing: Flammability classification U 94 5VA.

Weight: European Housing: 5.44 oz (154 g); North American Housing:

6.24 oz (177 g).

Agency Approvals: CE, RoHS.

Specifications - Installation and perating Instructions

Series CDX Wall Mount Carbon Dioxide Transmitter

4-37/64

[116.33]

1-1/64

[25.65]

3-13/64

[81.28]

Ø5/32 x 4

[Ø3.87]

Ø5/32 x 3

[Ø3.87]

3-13/64

[81.28]

1-1/16

[27.18]

3-13/32

[86.36]

DWYER INSTRUMENTS, INC.

Phone: 219/879-8000 www.dwyer-inst.com

P. . B X 373 • MICHIGAN CITY, INDIANA 46360, U.S.A. Fax: 219/872-9057 e-mail: [email protected]

WIRING C NFIGURATI NS

Figure 1: Current Wiring for 3-Wire System – AC Power

Figure 2: Voltage Wiring for 3-Wire System – AC Power

Figure 3: Current Wiring for 4-Wire System – AC Power

Figure 4: Voltage Wiring for 4-Wire System – AC Power

The Series CDX has two terminal pins that are connected inside the sensor

to a common/ground: pin #7 on the I/O terminal blocks and pin #2 on the

power block. Do NOT connect positive 24 VAC power line to pin #2 of the

terminal block.

P WER SUPPLY REQUIREMENTS

The sensor can be powered with either 18 to 30 VAC or 18 to 42 VDC,

while the DC power is polarity protected. AC power must be at a frequency

between 50 to 60 Hz.

CALIBRATI N

The Series CDX is factory set with the proprietary logic function activated.

The logic function allows the sensor to continuously re-calibrate itself when

the indoor concentrations drop to levels similar to outside conditions when

the building is unoccupied. The building must be unoccupied for a

minimum of 4 hours or more for this self calibration to be effective. The

logic allows the sensor to maintain its calibration over the life of the sensor.

ACCESS RY ENCL SURES

When mounting these products inside the ductwork, seal the hole around

the wires and leave the duct insulation in place to prevent condensation

which may damage the sensor.

Model 1508 Duct Mount Enclosure

The CDX units can be installed inside a Model 1508 Duct Mount Enclosure.

Model 1552 utside Air Measurement Enclosure

This NEMA-3R weatherproof enclosure includes thermostat and allows

installation of the sensor in environments with temperatures down to -40°F

(-40°C).

Duct Mount Enclosure (left), utside Air Enclosure (right)

MAINTENANCE/REPAIR

Upon final installation of the Series CDX, no routine maintenance is

required. The Series CDX is not field serviceable and should be returned if

repair is needed. Field repair should not be attempted and may void

warranty.

WARRANTY/RETURN

Refer to “Terms and Conditions of Sale” in our catalog and on our website.

Contact customer service to receive a Return Goods Authorization number

before shipping the product back for repair. Be sure to include a brief

description of the problem plus any additional application notes.

Before performing service or maintenance operations on the

systems, turn OFF main power switches to the unit. Electric

shock can cause personal injury. Please read and follow the wiring instructions

precisely because improper wiring my cause permanent damage to the product.

WARNING

The Series CDX is either a 3-wire or 4-wire type configuration,

device. Wiring the units as 2-wire or loop-powered devices will irreparably damage

the sensors and void the warranty.

CAUTI N

Recommended length of wire after being

stripped of insulation for terminal pin (left).

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