Dwyer Instruments CDTV Series Installation and operating instructions

Series CDTV Duct Mount Carbon Dioxide / Volatile

Organic Compound Transmitter

Specications - Installation and Operating Instructions

Bulletin AQ-CDTV-D

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 CO2and 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 CO2and VOC

transmitters.

Carbon dioxide measurements are taken using our proven Single-Beam Dual-

Wavelength 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 CO2equivalent” 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 CO2in 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 CO2equivalent.

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 minutes for 99% step change; VOC: 5 minutes.

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

Power Requirements: 16 to 35 VDC / 19 to 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 to 20 mA, 4 to 20 mA, 0 to 10 mA, or 2 to 10 mA (depending on

selection jumper, max 500 Ω); Voltage: 0 to 10 VDC, 2 to 10 VDC, 0 to 5 VDC, or 1

to 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

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.

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

Disconnect power supply before installation to prevent electrical

shock and equipment damage.

WARNING

Upon powering the transmitter, the rmware version will ash on

the display. A warm up period of 30 minutes is required for the

transmitter to adjust to the current CO2concentration.

NOTICE

Self calibration feature of the transmitter requires exposure to

normal outdoor equivalent carbon dioxide level once every thirty

days.

NOTICE

Use electrostatic discharge precautions (e.g., use of wrist straps)

during installation and wiring to prevent equipment damage.

CAUTION

Avoid locations where severe shock or vibration, excessive

moisture or corrosive fumes are present.

CAUTION

Do not exceed ratings of this device. Permanent damage not

covered by warranty may result.

CAUTION

1/8˝

[3.17]

4-25/32˝

[121.44]

4-9/32˝

[108.74] 2-13/16˝

[71.44]

Ø3-5/16˝

[84.14]

11-49/64˝

[298.85]

Ø1-15/64˝

[31.35]

DWYER INSTRUMENTS, INC.

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

Phone: 219/879-8000

Fax: 219/872-9057

www.dwyer-inst.com

e-mail: [email protected]

MOUNTING

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.

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 to 10 VDC, 0 to 5 VDC, 2 to 10 VDC or 1 to 5 VDC. See

Figure 3 for the type of voltage output selection switches (positions 3 & 4).

Figure 2: Current/Voltage Output

Selection Jumper (PJ1 and PJ2)

Figure 3: Output range selection jumper

Figure 1: Diagram of circuit board

DOWN PUSH

BUTTON

CONFIGURA

TION

SWITCHES TERMINAL

BLOCK

REMOTE DISPL

CONNECTOR

UP PUSH BUTTON

ENTER PUSH BUTTON

CO2 CONCENTRATION

OUTPUT SELECTION

VOC OUTPUT SELECTION

VOLTAGEC

URRENTVO

LTAGECURRENT

0-10 V

0-20 mA

2-10 V

4-20 mA

0-5 V

0-10 mA

1-5 V

2-10 mA

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 or 35 VDC or 19 to 28 VAC. Wire

the transmitter according to Figure 4.

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.

PASSIVE

TEMPERA

TURE

SENSOR

RELAY

CONTACT

POWER

SUPPLY

VOC

RECEIVER

CO2

RECEIVER

Figure 4: Active output wiring diagram

Optional relay can be used as either a dry contact or low voltage

switched circuit up to 2 A at 30 VDC.

NOTICE

Menu Descriptions

ROC Dene which output relay will be congured.

CO2default

VOC

Max CO2/ VOC

RON Relay set point

Sets the CO2or VOC concentration which the optional relay is energized.

Low limit: 0 PPM

Factory setting: 1000 PPM

High limit: 2000 PPM (CO2or VOC), 5000 PPM (only CO2)

ROF Relay off set point

Sets the CO2or VOC concentration which the optional relay is de-energized.

Setting value lower than RON provides direct action for detecting

high concentrations of CO2. Setting value higher than RON provides indirect

action for detecting low concentrations of CO2. or on the LCD

display will be lit to indicate when the relay is energized.

Low limit: 0 PPM

Factory setting: 950 PPM

High limit: 2000 PPM (CO2 or VOC), 5000 PPM (only CO2)

DSP Display conguration

Determines the LCD display conguration during normal operation. The

LCD display can indicate the CO2concentration or VOC concentration.

C CO2concentration only

V VOC only

UNI Units selection

Temperature and barometric pressure values can be displayed in US

engineering units or SI engineering units. The factory default is to display

US engineering units.

US units Hg for barometric pressure

SI units hPa for barometric pressure

COL CO2low output range

Sets the CO2concentration for the lowest output (0 V, 1 V, 2 V, 0 mA, 2 mA,

4 mA).

Low limit: 0 PPM

Factory setting: 0 PPM

High limit: 2000 PPM (CO2or VOC), 5000 PPM (only CO2)

COH CO2high output range

Sets the CO2concentration for the highest output (10 mA or 5 V, 20 mA or

10 V). When COH is set above COL, the transmitter is direct acting and the

output will increase with an increase in CO2level. When COH is below

COL, the transmitter is reverse acting and the output will increase with a

decrease in CO2level.

Low limit: 0 PPM

Factory setting: 2000 PPM (CO2or VOC), 5000 PPM (only CO2)

High limit: 2000 PPM (CO2or VOC), 5000 PPM (only CO2)

VOL VOC low output range

Sets the VOC for the lowest output (0 V, 1 V, 2 V, 0 mA, 2 mA, 4 mA). To

congure output for 450 PPM equal 0V, set VOL to 450 PPM. Even if power

is lost the VOL setpoint will remain in memory.

Low limit: 0 PPM

Factory setting: 0 PPM

High limit: 2000 PPM CO2 equivalent

VOH VOC high output range

Sets the VOC level for the highest output (10 mA or 5 V, 20 mA or 10 V).

When VOH is set above VOL, the transmitter is direct acting and the output

will increase with an increase in VOC level. When VOH is below VOL, the

transmitter is reverse acting and the output will increase with a decrease in

VOC level.

Low limit: 450 PPM

Factory setting: 2000 PPM CO2equivalent

High limit: 2000 PPM CO2equivalent

BAR Barometric pressure

Sets the typical barometric pressure for the location where the transmitter

is mounted. The factory setting is for standard pressure at sea level.

Adjusting the barometric pressure gives a more accurate measurement,

especially at higher elevations. Refer to the elevation charts in Figure 9 for

typical barometric pressures at a given elevation.

Low limit: 20.0 in Hg / 600 hPa

Factory setting: 29.9 in Hg / 1013 hPa

High limit: 32.0 in Hg / 1100 hPa

CAL Calibration

Calibrates in carbon dioxide sensor to a known gas valve. Read calibration

instructions before using this feature. Hold for 5 seconds.

DWYER INSTRUMENTS, INC.

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

Phone: 219/879-8000

Fax: 219/872-9057

www.dwyer-inst.com

e-mail: [email protected]

CALIBRATING CO2 SENSOR

Step 1: Slide probe into sealed calibration tube.

Step 2: Tighten screws to lock probe in place.

Step 3: Attach gas to the calibration tube.

Step 4: Follow the steps in the accessing parameter section to access the

calibration parameter (CAL).

Step 5: Press the button.

Step 6: Flow zero reference gas at 0.3 SLPM for 5 minutes.

Step 7: Press and hold the button for 3 seconds.

Step 8: Flow the full scale reference gas at 0.3 SLPM for 5 minutes.

Step 9: Press and hold the button for 3 seconds.

Step 10: Exit the parameter menu.

Step 11: Loosen screws to release probe.

Step 12: Remove probe from sealed calibration tube.

MAINTENANCE/REPAIR

Upon nal installation of the Series CDTV, no routine maintenance is required. The

Series CDTV is not eld 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 Sales” in our catalog and on our website. Contact

customer service to return 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.

MODEL CHART

Series CDTV -2 D4A4 -RLY Example: CDTV-2D4A4-RLY

Range 2

0 to 2000 ppm CO2 range

0 to 5000 ppm CO2 range

Conguration D

Duct

North American style wall mount

CO2 Output 4 4 to 20 mA / 0 to (5 or 10) VDC

Temperature

Output

None

10 KΩ NTC thermistor type III

10 KΩ NTC thermistor type II

3 KΩ NTC thermistor

Pt100 Ω RTD

Pt1000 Ω RTD

20 KΩ NTC thermistor

VOC Output 4 4 to 20 mA / 0 to (5 or 10) VDC

Options RLY

COC

LCD

Relay

Factory calibration certicate

Certicate of calibration

LCD display (wall only)

US Customary Units

ft in Hg

400

800

1200

1600

2000

2400

2800

3200

3600

4000

4400

4800

5200

5600

6000

6400

6800

7200

7600

8000

8400

8800

9200

9600

10000

29.92

29.50

29.10

28.69

28.29

27.90

27.51

27.13

26.76

26.39

26.02

25.66

25.30

24.95

24.60

24.26

23.93

23.60

23.27

22.94

22.63

22.31

22.00

21.70

21.40

RESISTANCE VS TEMPERATURE TABLE

Temperature Resistance Curves (in Ohms)

°C °F A B C D E F

-55

-50

-45

-40

-35

-30

-25

-20

-15

-10

-5

100

105

110

115

120

125

130

135

140

145

150

-67.0

-58.0

-49.0

-40.0

-31.0

-22.0

-13.0

-4.0

5.0

14.0

23.0

32.0

41.0

50.0

59.0

68.0

77.0

86.0

95.0

104.0

113.0

122.0

131.0

140.0

149.0

158.0

167.0

176.0

185.0

194.0

203.0

212.0

221.0

230.0

239.0

248.0

257.0

266.0

275.0

284.0

293.0

302.0

607800.00

441200.00

323600.00

239700.00

179200.00

135200.00

102900.00

78910.00

61020.00

47540.00

37310.00

29490.00

23460.00

18780.00

15130.00

12260.00

10000.00

8194.00

6752.00

5592.00

4655.00

3893.00

3271.00

2760.00

2339.00

1990.00

1700.00

1458.00

1255.00

1084.00

939.30

816.80

712.60

623.60

547.30

481.80

425.30

376.40

334.00

297.20

265.10

237.00

963849.00

670166.00

471985.00

336479.00

242681.00

176974.00

130421.00

97081.00

72957.00

55329.00

42327.00

32650.00

25392.00

19901.00

15712.00

12493.00

10000.00

8057.00

6531.00

5326.00

4368.00

3602.00

2986.00

2488.00

2083.00

1752.00

1480.00

1255.00

1070.00

915.50

786.60

678.60

587.60

510.60

445.30

389.60

341.90

301.00

265.80

235.30

208.90

186.10

289154.70

201049.80

141595.50

100943.70

72804.30

53092.20

39126.30

29124.30

21887.10

16598.70

12698.10

9795.00

7617.60

5970.30

4713.60

3747.90

3000.00

2417.10

1959.30

1597.80

1310.40

1080.60

895.80

746.40

624.90

525.60

444.00

376.50

321.00

274.65

235.98

203.58

176.28

153.18

133.59

116.88

102.57

90.30

79.74

70.59

62.67

55.83

78.32

80.31

82.29

84.27

86.25

88.22

90.19

92.16

94.12

96.09

98.04

100.00

101.95

103.90

105.85

107.79

109.74

111.67

113.61

115.54

117.47

119.40

121.32

123.24

125.16

127.08

128.99

130.90

132.80

134.71

136.61

138.51

140.40

142.29

144.18

146.07

147.95

149.83

151.71

153.58

155.46

157.33

783.2

803.1

822.9

842.7

862.5

882.2

901.9

921.6

941.2

960.9

980.4

1000.0

1019.5

1039.0

1058.5

1077.9

1097.4

1116.7

1136.1

1155.4

1174.7

1194.0

1213.2

1232.4

1251.6

1270.8

1289.9

1309.0

1328.0

1347.1

1366.1

1385.1

1404.0

1422.9

1441.8

1460.7

1479.5

1498.3

1517.1

1535.8

1554.6

1573.3

2394000.00

1646200.00

1145800.00

806800.00

574400.00

413400.00

300400.00

220600.00

163500.00

122280.00

92240.00

70160.00

53780.00

41560.00

32340.00

25360.00

20000.00

15892.00

12704.00

10216.00

8264.00

6722.00

5498.00

4520.00

3734.00

3100.00

2586.00

2166.00

1822.60

1540.00

1306.40

1112.60

951.00

815.80

702.20

606.40

525.60

N/A

SI Units

m hPa

100

200

300

400

500

600

700

800

900

1000

1100

1200

1300

1400

1500

1600

1700

1800

1900

2000

2100

2200

2300

2400

2500

1013

1002

990

979

968

957

946

935

924

914

904

893

883

873

863

853

844

834

824

815

806

797

787

779

770

761

Figure 5: CDTV Model Chart

Figure 6: Elevation Chart

Figure 7: Resistance vs Temperature

This symbol indicates waste electrical products should not be disposed

of with household waste. Please recycle where facilities exist. Check with

your Local Authority or retailer for recycling advice.

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