Dwyer Instruments CDT Series Manuel utilisateur

Series CDT and CDTR Duct Mount Carbon Dioxide/

Temperature/Relative Humidity Transmitter

Specications - Installation and Operating Instructions

Bulletin AQ-CDT/CDTR-3

Series CDT and CDTR Duct Mount Carbon Dioxide/ Temperature/Relative

Humidity Transmitters accurately monitor the CO2concentration and temperature

in schools, ofce buildings, and other indoor environments to help achieve LEED®

certication. A non-dispersive infrared (NDIR) sensor is used to automatically correct

the measurement in both occupied and unoccupied buildings against aging effects. 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 conguration purposes, the Series CDT and CDTR can be ordered with the Model

A-449 remote LCD display that can plug into the mini-connector port on the internal

circuit board. Menu items that can be accessed include: engineering units, relay output

set points, display conguration, transmitter output scaling, and ambient barometric

pressure.

Automated CO2Baseline Correction (ABC)

The Series CDT and CDTR CO2transmitters are maintenance free instruments

with the ability to adjust the CO2 calibration by using the on-board ABC logic for

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 CO2

readings it measures. CO2 calibration adjustments are made every eight days by the

ABC algorithm. For environments occupied 24 hours per day it is recommended to

periodically expose the CO2 sensor to outside ambient air.

INSTALLATION

Disconnect power supply before installation to prevent electrical

shock and equipment damage.

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.

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 rmware version will ash on

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

transmitter to adjust to the current CO2 concentration.

Self calibration feature of the transmitter requires exposure to

normal outdoor equivalent carbon dioxide level once every thirty

days.

NOTICE

SPECIFICATIONS

Sensor: NDIR, 15 year life expectancy.

Range: CO2: 0 to 2000 or 0 to 5000 PPM (depending on model); RH: 0 to 100%

(for units congured with humidity output); Temperature: 32 to 122°F (0 to 50°C).

Accuracy*: ±40 PPM + 3% of reading (2000 PPM CO2); ±50 PPM + 5% of reading

(5000 PPM CO2); RH: ±2% (for units congured with 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% RH (non-condensing).

Power Requirements: 16-35 VDC/19-28 VAC.

Power Consumption: Average: 2 watts; Peak: 3.75 watts.

Output: Current: 4-20 mA (max 500 Ω); Voltage: 0-5 VDC or 0-10 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).

Agency Approvals: CE.

*The specied CO2 accuracy is only guaranteed after three weeks of continuous

operation in environments which are intermittently occupied.

WARNING

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 and 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 0-10 VDC, 0-5 VDC, 2-10 VDC or 1-5

VDC. See Figure 3 for the type of voltage output selection switches (positions 3 and 4).

Current/Voltage Outputs

The transmitter may be wired for current or voltage output for both carbon dioxide and

temperature. The transmitter can be powered with either 16-35 VDC or 19-28 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.

ACCESSING MENU PARAMETERS

Step 1: To enter the menu structure, press “Up” and “Down” simultaneously for 5

seconds (display will show RON parameter).

Step 2: Press “Up” or “Down” to cycle between menu items.

Step 3: Press “Enter” to edit the value for the displayed menu item (SET will appear

on display).

Step 4: Press “Up” or “Down” to adjust the value of the menu item.

Step 5: Press “Enter” 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 “Down” and “Up” simultaneously

for 5 seconds or wait 10 seconds without pushing any buttons.

PASSIVE

TEMPERA

TURE

SENSOR

12 345678

PWR

OUT1

OUT2

RLY

SEN

RELAY

CONTACT

POWER

SUPPLY TEMP OR RH

RECEIVER

CO2

RECEIVER

Figure 4: Active output wiring diagram

Figure 1: Diagram of circuit board

Figure 2: Current/voltage output

Selection jumper (PJ1 And PJ2)

Figure 3: Output range selection jumper

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

switched circuit up to 2 A at 30 VDC.

NOTICE

DOWN PUSH

BUTTON

CONFIGUATION

SWITCHES TERMINAL

BLOCK

REMOTE DISPLAY

CONNECTOR

UP PUSH BUTTON

ENTER PUSH BUTTON

CO2 CONCENTRATION

OUTPUT SELECTION

TEMPERATURE/

RH OUTPUT SELECTION

VOLTAGE CURREN

TVO

LTAGE CURRENT

0-10 V

0-20 mA

2-10 V

4-20 mA

0-5 V

0-10 mA

1-5 V

2-10 mA

Maximum CO2 value

Displays the highest CO2 concentration value observed by the sensor since

the last power cycle or reset.

Reset the MAX CO2 concentration by pressing and holding the ENTER button

for 1 second.

Relay on set point

Sets the CO2 concentration which the optional relay is energized.

Low limit: 0 PPM

Factory setting: 1000 PPM

High limit: 2000/5000 PPM (depending on model)

Relay off set point

Sets the CO2 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. “Up” or “Down” on the LCD display will be lit to

indicate when the relay is energized.

Low limit: 0 PPM

Factory setting: 950 PPM

High limit: 2000/5000 PPM (depending on model)

Display conguration

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

display can indicate the CO2 concentration, temperature, relative humidity

(CDTR only) and CO2 concentration combined with temperature or relative

humidity (CDTR only).

CH CO

2 concentration and relative humidity (CDTR only)

CT CO

2concentration and temperature

C CO2concentration only

T Temperature only

H Relative humidity only (CDTR only)

Units selection

Temperature and barometric pressure measurements can be displayed in US

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

engineering units.

US units °F for temperature and in Hg for barometric pressure

SI units °C for temperature and hPa for barometric pressure

Temperature offset

Allows the user to add an offset to the measured temperature.

Range: ±5°C in 0.5°C increments (±9°F in 1°F increments)

Factory Default: 0°C

Humidity offset (CDTR only)

Allows the user to add an offset to the measured relative humidity.

Range: ±10% in 1% increments

Factory Default: 0% RH

CO2 low output range

Sets the CO2 concentration for the lowest output (4 mA or 0 VDC).

Low limit: 0 PPM

Factory setting: 0 PPM

High limit: 2000/5000 PPM (depending on model)

CO2 high output range

Sets the CO2 concentration for the highest output (20 mA, 5 VDC or 10 VDC).

When COH is set above COL, the transmitter is direct acting and the output

will increase with an increase in CO2 level. When COH is below COL, the

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

CO2 level.

Low limit: 0 PPM

Factory setting: 2000/5000 PPM (depending on model)

High limit: 2000/5000 PPM (depending on model)

MAX

RON

ROF

DSP

UNI

OFT

OFH

COL

COH

TOL

TOH

HOL

HOH

BAR

ABC

RST

Temperature low output range (CDT with active temperature only)

Sets the temperature for the lowest output (4 mA or 0 VDC).

Low limit: 32.0°F / 0.0°C

Factory setting: 32.0°F / 0.0°C

High limit: 122.0°F / 50.0°C

Temperature high output range (CDT with active temperature only)

Sets the temperature for the highest output (20 mA, 5 VDC or 10 VDC).

When TOH is set above TOL, the transmitter is direct acting and the output

will increase with an increase in temperature. When TOH is below TOL, the

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

temperature.

Low limit: 32.0°F / 0.0°C

Factory setting: 122.0°F / 50.0°C

High limit: 122.0°F / 50.0°C

Humidity low output range (CDTR only)

Sets the temperature for the lowest output (4 mA or 0 VDC).

Low limit: 0.0%

Factory setting: 0.0%

High limit: 100.0%

Humidity high output range (CDTR only)

Sets the temperature for the highest output (20 mA, 5 VDC or 10 VDC).

When HOH is set above HOL, the transmitter is direct acting and the output

will increase with an increase in temperature. When HOH is below HOL, the

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

temperature.

Low limit: 0.0%

Factory setting: 100.0%

High limit: 100.0%

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 6 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

Automated baseline correction

Enables/disables the Automated Baseline Correction algorithm for disabling

in locations that experience elevated levels of CO2due to constant occupancy

of the area. Select “ON” to enable ABC and select “OFF” to disable ABC.

Factory Default: ON

Reset to factory defaults

Resets all menu settings to their default value, and clears zero and span.

YES - Press and hold - button for several seconds to reset settings

NO - Press button to exit this menu item without resetting

Menu Descriptions

MAINTENANCE/REPAIR

Upon nal installation of the Series CDT/CDTR, no routine maintenance is required.

The Series CDT/CDTR 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 receive a Return Material Authorization number before shipping

the product back for repair. Be sure to include a brief description of the problem plus

any additional application notes.

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

SI Units

mhPa

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

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

Figure 5: Elevation chart

Figure 6: Resistance vs temperature

RESISTANCE VS TEMPERATURE TABLE

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.

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

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]

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