Series CDTV Duct Mount Carbon Dioxide / Volatile
®
Organic Compound Transmitter
Specications - 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 dened, 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 unltered 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: 219/879-8000
Fax: 219/872-9057
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: info@dwyermail.com
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 conguration switches (positions 1 and
2) are set to the desired output type. Refer to Figure 1 to locate the conguration
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
Menu Descriptions
ROC Dene which output relay will be congured.
CO2 default
VOC
Max CO2 / VOC
RON Relay set point
Sets the CO2 or VOC concentration which the optional relay is energized.
Low limit: 0 PPM
Factory setting: 1000 PPM
High limit: 2000 PPM (CO2 or VOC), 5000 PPM (only CO2)
ROF Relay off set point
Sets the CO2 or 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.
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
congure 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 CO2 equivalent
High limit: 2000 PPM CO2 equivalent
Low limit: 0 PPM
Factory setting: 950 PPM
High limit: 2000 PPM (CO2 or VOC), 5000 PPM (only CO2)
DSP Display conguration
Determines the LCD display conguration during normal operation. The
LCD display can indicate the CO2 concentration or VOC concentration.
C CO2 concentration 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 CO2 low output range
Sets the CO2 concentration 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 (CO2 or VOC), 5000 PPM (only CO2)
COH CO2 high output range
Sets the CO2 concentration 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 CO2 level. When COH is below
COL, the transmitter is reverse acting and the output will increase with a
decrease in CO2 level.
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 5 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
Calibration
Calibrates the carbon dioxide sensor to a known gas value. Duct mount
transmitters are not designed for calibration in the eld and should be
returned for routine maintenance.
Low limit: 0 PPM
Factory setting: 2000 PPM (CO2 or VOC), 5000 PPM (only CO2)
High limit: 2000 PPM (CO2 or VOC), 5000 PPM (only CO2)
AAC Average Atmospheric Carbon Dioxide value
Sets the value at which the sensors automatic background calibration
will reference. Factory setting derived from research from the National
Oceanic and Atmospheric Administration (NOAA).
Low limit: 200 PPM
Factory setting: Current NOAA value
High limit: 9999 PPM
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.
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.
WARRANTY/RETURN
Refer to “Terms and Conditions of Sales” in our catalog and on our website. Contact
customer service to obtain a Return Materials Authorization number (RMA) 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
0
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
21.40
Figure 5: Elevation Chart
SI Units
m hPa
0
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
RESISTANCE VS TEMPERATURE TABLE
Temperature Resistance Curves (in Ohms)
°C °F A B C D E F
-55
-67.0
-50
-45
-40
-35
-30
-25
-20
-15
-10
-5
0
5
10
15
20
25
30
35
40
45
50
55
60
65
70
75
80
85
90
95
100
105
110
115
120
125
130
135
140
145
150
-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
Figure 6: Resistance vs Temperature
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
N/A
N/A
N/A
N/A
DWYER INSTRUMENTS, INC.
P.O. BOX 373 • MICHIGAN CITY, INDIANA 46360, U.S.A.
Printed in U.S.A. 9/20 FR# 444204-10©Copyright 2020 Dwyer Instruments, Inc.
Phone: 219/879-8000
Fax: 219/872-9057
www.dwyer-inst.com
e-mail: info@dwyermail.com
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