Series CDT and CDTR Wall Mount Carbon Dioxide/Temperature TransmitterSpecifications - Installation and Operating InstructionsBulletin AQ-CDT/CDTR-E/NSeries CDT and CDTR Wall Mount Carbon Dioxide Temperature Transmitters accurately monitor the CO2 concentration and temperature in schools, office buildings, and other indoor environments to help achieve LEED® certification. Additionally, the Series CDTR also measures ambient relative humidity. For increased sensor life, a single- beam dual-wavelength non-dispersive infrared (NDIR) sensor is used to automatically correct the measurement in both occupied and unoccupied buildings against aging effects. The single-beam dual-wavelength sensor technology provides the highest level of accuracy compared to Automatic Baseline Correction methods, which can unintentionally shift the calibration based on CO2 levels and barometric pressure conditions. In order to achieve a higher level of accuracy, the Series CDT includes digital barometric pressure adjustment and the ability to field-calibrate the sensor.Universal outputs allow users to select the transmitter output to be 4 to 20 mA, 0 to 5 VDC, or 0 to 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 applications that require visual indication, the Series CDT and CDTR can be ordered with an integral LCD display, Model A-449 or Model A-449A remote LCD display that can plug into the mini-connector port on the side of the transmitter. Both the CDT and CDTR can be configured to display temperature only, CO2 only, or CO2 and temperature together. The Series CDTR can also display relative humidity or CO2 and relative humidity together. Push buttons are standard on the transmitters for access to the menu structure, but the transmitter can be ordered without the buttons. To prevent tampering, the action of the buttons can be locked out using an internal dip switch selection. Menu items that can be accessed include: engineering units, relay output set points, display configuration, transmitter output scaling, ambient barometric pressure and field calibration of the transmitter.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 unfiltered light intensity directly ◦ Eliminates error from incorrect assumptions of gas concentration in theoretical logic assumption methods* For buildings occupied 24 hours per day, it is recommended that calibration be verified every 6 to 12 months depending on application.INSTALLATIONSPECIFICATIONSSensor: Single beam, dual-wavelength NDIR.Range: CO2: 0 to 2000 or 0 to 5000 ppm (depending on model); Temperature: 32 to 122°F (0 to 50°C).Accuracy: CO2: ±40 ppm ±3% of reading; RH: ±2% (10 to 90% RH) (for units configured with humidity output); Temperature: ±1°C @ 25°C.Temperature Dependence: ±8 ppm/°C at 1100 ppm.Non-Linearity: 16 ppm.Pressure Dependence: 0.13% of reading per mm of Hg.Response Time: 2 min for 99% step change.Temperature Limits: 32 to 122°F (0 to 50°C).Humidity Limits: 10 to 95% RH (non-condensing).Power Requirements: 16 to 35 VDC or 19 to 28 VAC.Power Consumption: Average: 2 w; Peak: 3.75 w.Output: Current: 4 to 20 mA (max. 500 Ω); Voltage: 0 to 5 VDC or 0 to 10 VDC (min. 500 Ω); Relay: SPST NO rated 2A @ 30 VDC; RTD or thermistor per r-t curves on page 4 (depending on model).Weight: 4.4 oz (125 g).Agency Approvals: CE.3.65[92.72]3.56[90.42]1.08[27.33]4.50[114.30]2.80[71.12]1.10[27.96]North AmericanEuropeanLEED® is a registered trademark of the U.S. Green Building CouncilDisconnect 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.CAUTIONUse 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 firmware version will flash 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.NOTICENOTICENOTICENOTICENOTICE®DWYER INSTRUMENTS, INC.P.O. BOX 373 • MICHIGAN CITY, INDIANA 46360, U.S.A.Phone: 219/879-8000Fax: 219/872-9057www.dwyer-inst.come-mail: info@dwyermail.comMOUNTING1. Push tab on top and bottom of cover and lift cover from back plate (See Figure 1).2. Select the mounting location, away from diffusers, lights or any external influences.3. Mount transmitter on a vertical surface to a standard electrical box using the two #6 M2C type screws provided.4. Pull wires through sub base hole and make necessary connections.5. Reattach cover to base plate.WIRINGUse maximum 18 AWG wire for wiring to terminals. Refer to Figure 4 for wiring information.DIP SWITCH SETTINGSTo access the DIP SWITCH, remove the cover of the unit as shown in Figure 2. The DIP SWITCH is located on the back of the circuit board. DIP Switch Position 1: CO2 Output SelectionON: Output set to voltage outputOFF: Output set to current outputDIP Switch Position 2: Temperature (CDT models) / Humidity (CDTR models) Output SelectionON: Output set to voltage outputOFF: Output set to current outputDIP Switch Positions 3 & 4: Current or Voltage Output Range SelectionDip Switch Position 5: Menu AccessON: Menu Enabled OFF: Menu DisabledCurrent / Voltage OutputsOn the Series CDT, the transmitter may be wired for current or voltage output for both carbon dioxide and temperature. On the Series CDTR, the transmitter may be wired for current or voltage output for both carbon dioxide and humidity. The transmitter can be powered with either 16 to 35 VDC or 19 to 28 VAC. Wire the transmitter according to Figure 4. Remote DisplayFor models that are ordered without an integral LCD display, remote display Model A-449 can be used to display the temperature, humidity, and 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 current temperature and carbon dioxide measurements unless configured by the user to show humidity and carbon dioxide, only temperature, only humidity, or only carbon dioxide.EDITING MENU PARAMETERSBefore any adjustment can be made to the transmitter, the Menu Lockout Dip Switch must be set to the ˝On˝ position (See Figure 3)ACCESSING MENU PARAMETERSStep 1: To enter the menu structure, press Up button and Down button simultaneously for 5 seconds (display will show RON parameter). Step 2: Press Up button or Down button 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 button or Down button to adjust the value of the menu item.Step 5: Press Enter button 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 Up button and Down button simultaneously for 5 seconds or wait 10 seconds without pushing any buttons.PASSIVETEMPERATURESENSORRELAYCONTACTPOWERSUPPLYTEMP OR RHRECEIVERCO2RECEIVERFigure 1: Removal Of Cover From Back PlateFigure 4: Active Output Wiring DiagramFigure 3UP = “ON”DOWN = “OFF”DIP SWITCH #1DIP SWITCHDIP SWITCH #6Figure 2: Diagram Of Circuit BoardFigure 5: Side View of TransmitterDip SwitchOutput RangeDIP Switch 3 PositionDIP Switch 4 Position2 to 10 V4 to 20 mAONOFF0 to 10 V0 to 20 mAOFFOFF0 to 5 V0 to 10 mAOFFON1 to 5 V2 to 10 mAONONOptional relay can be used as either a dry contact or low voltage switched circuit up to 2 A at 30 VDCNOTICEEnterUpRemote Display PortDownRelay on set pointSets the CO2 concentration which the optional relay is energized.Low limit: 0 PPMFactory setting: 1000 PPMHigh limit: 2000/5000 PPM (depending on model)Relay off set pointSets 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 button and Down button on the LCD display will be lit to indicate when the relay is energized. Low limit: 0 PPMFactory setting: 950 PPMHigh limit: 2000/5000 PPM (depending on model)Display configurationDetermines the LCD display configuration during normal operation. The LCD display can indicate the CO2 concentration, temperature, relative humidity (Series CDTR only) and CO2 concentration combined with temperature or relative humidity (Series CDTR only).CH CO2 concentration and relative humidity (Series CDTR only)CT CO2 concentration and temperatureTH Temperature and relative humidity (Series CDTR only)C CO2 concentration onlyT Temperature onlyH Relative humidity only (Series CDTR only)Units selectionTemperature 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 pressureSI units °C for temperature and hPa for barometric pressureCO2 low output rangeSets the CO2 concentration for the lowest output (4 mA or 0 VDC).Low limit: 0 PPMFactory setting: 0 PPMHigh limit: 2000/5000 PPM (depending on model)CO2 high output rangeSets 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 PPMFactory setting: 2000/5000 PPM (depending on model)High limit: 2000/5000 PPM (depending on model)Temperature low output range (Series CDT with active temperature only)Sets the temperature for the lowest output (4 mA or 0 VDC).Low limit: 32.0°F / 0.0°CFactory setting: 32.0°F / 0.0°CHigh limit: 122.0°F / 50.0°CTemperature high output range (Series 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°CFactory setting: 122.0°F / 50.0°CHigh limit: 122.0°F / 50.0°CRON ROFDSPUNICOLCOHTOLTOHHOLHOHBARCALRSTHumidity low output range (Series CDTR only)Sets the humidity 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 (Series CDTR only)Sets the humidity 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 humidity. When HOH is below HOL, the transmitter is reverse acting and the output will increase with a decrease in humidity.Low limit: 0.0%Factory setting: 100.0%High limit: 100.0%Barometric pressureSets 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 / 677 hPaFactory setting: 29.9 in Hg / 1013 hPaHigh limit: 32.0 in Hg / 1084 hPaCalibrationCalibrates the carbon dioxide sensor to a known gas value. Read calibration instructions before using this feature. Hold Enter button for 5 seconds.Reset to Factory DefaultsResets all menu settings to their default value, and clears zero and span.YES - Press & hold -- button for several seconds to reset settingsNO - Press -- button to exit this menu item without resettingCALIBRATING SENSOR Step 1: Remove the cover as shown in Figure 1. Step 2: Remove one of the gas nipple covers on the CO2 sensor and attach tubing from the gas pressure regulator to the nipple (See Figure 6).Step 3: Attach the terminal block accessory to the circuit board so that the power wires line up with terminals 1 and 2. Plug in the power supply to power up the transmitter.Step 4: Hold housing so that the sensor is in the vertical plane as shown in Figure 6.Step 5: Follow the steps in the accessing parameter section to access the calibration parameter (CAL).Step 6: Press the Enter button.Step 7: Flow zero reference gas at 0.3 SLPM for 5 minutes.Step 8: Press and hold the Down button for 3 seconds.Step 9: Flow the full scale reference gas at 0.3 SLPM for 5 minutes.Step 10: Press and hold the Up button for 3 seconds.Step 11: Exit the parameter menu.Step 12: Disconnect the power supply from the power source and remove the terminal block from the circuit board.Step 13: Remove tubing from sensor and re-attach the gas nipple cover to the sensor.Step 14: Re-attach the cover to the back plate.North AmericanFigure 6: CalibrationMenu DescriptionsEuropean©Copyright 2019 Dwyer Instruments, Inc.Printed in U.S.A. 1/19FR# 443800-30 Rev. 8MAINTENANCE/REPAIRUpon final installation of the Series CDT and CDTR, no routine maintenance is required. The Series CDT and CDTR are not field serviceable and should be returned if repair is needed. Field repair should not be attempted and may void warranty.WARRANTY/RETURNRefer to “Terms and Conditions of Sales” 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.SeriesCDT-2N44-LCDExample: CDT-2N44-LCDRange250 to 2000 ppm CO2 range0 to 5000 ppm CO2 rangeConfigurationNENorth American Wall MountEuropean Wall MountCO2 Output44 to 20 mA / 0 to (5 or 10) VDCTemperature Output04ABC DEFNone4 to 20 mA / 0 to (5 or 10) VDC10 KΩ NTC thermistor type III10 KΩ NTC thermistor type II3 KΩ NTC thermistorPt100 Ω RTDPt1000 Ω RTD20 KΩ NTC thermistorOptionsLCDRLYNBCLCD display (wall only)RelayNo buttons (wall only)US Customary Unitsftin Hg040080012001600200024002800320036004000440048005200560060006400680072007600800084008800920096001000029.9229.5029.1028.6928.2927.9027.5127.1326.7626.3926.0225.6625.3024.9524.6024.2623.9323.6023.2722.9422.6322.3122.0021.7021.4021.40SI UnitsmhPa0100200300400500600700800900100011001200130014001500160017001800190020002100220023002400250010131002990979968957946935924914904893883873863853844834824815806797787779770761SeriesCDT-2N4A4-LCDExample: CDTR-2N4A4-LCDRange250 to 2000 ppm CO2 range0 to 5000 ppm CO2 rangeConfigurationNENorth American Wall MountEuropean Wall MountCO2 Output44 to 20 mA / 0 to (5 or 10) VDCTemperature Output04ABC DEFNone4 to 20 mA / 0 to (5 or 10) VDC10 KΩ NTC thermistor type III10 KΩ NTC thermistor type II3 KΩ NTC thermistorPt100 Ω RTDPt1000 Ω RTD20 KΩ NTC thermistorRH Output44 to 20 mA / 0 to (5 or 10) VDCOptionsLCDRLYNBCLCD display (wall only)RelayNo buttons (wall only)TemperatureResistance Curves (in Ohms)°C°FABCDEF-55-50-45-40-35-30-25-20-15-10-505101520253035404550556065707580859095100105110115120125130135140145150-67.0-58.0-49.0-40.0-31.0-22.0-13.0-4.05.014.023.032.041.050.059.068.077.086.095.0104.0113.0122.0131.0140.0149.0158.0167.0176.0185.0194.0203.0212.0221.0230.0239.0248.0257.0266.0275.0284.0293.0302.0607800.00441200.00323600.00239700.00179200.00135200.00102900.0078910.0061020.0047540.0037310.0029490.0023460.0018780.0015130.0012260.0010000.008194.006752.005592.004655.003893.003271.002760.002339.001990.001700.001458.001255.001084.00939.30816.80712.60623.60547.30481.80425.30376.40334.00297.20265.10237.00963849.00670166.00471985.00336479.00242681.00176974.00130421.0097081.0072957.0055329.0042327.0032650.0025392.0019901.0015712.0012493.0010000.008057.006531.005326.004368.003602.002986.002488.002083.001752.001480.001255.001070.00915.50786.60678.60587.60510.60445.30389.60341.90301.00265.80235.30208.90186.10289154.70201049.80141595.50100943.7072804.3053092.2039126.3029124.3021887.1016598.7012698.109795.007617.605970.304713.603747.903000.002417.101959.301597.801310.401080.60895.80746.40624.90525.60444.00376.50321.00274.65235.98203.58176.28153.18133.59116.88102.5790.3079.7470.5962.6755.8378.3280.3182.2984.2786.2588.2290.1992.1694.1296.0998.04100.00101.95103.90105.85107.79109.74111.67113.61115.54117.47119.40121.32123.24125.16127.08128.99130.90132.80134.71136.61138.51140.40142.29144.18146.07147.95149.83151.71153.58155.46157.33783.2803.1822.9842.7862.5882.2901.9921.6941.2960.9980.41000.01019.51039.01058.51077.91097.41116.71136.11155.41174.71194.01213.21232.41251.61270.81289.91309.01328.01347.11366.11385.11404.01422.91441.81460.71479.51498.31517.11535.81554.61573.32394000.001646200.001145800.00806800.00574400.00413400.00300400.00220600.00163500.00122280.0092240.0070160.0053780.0041560.0032340.0025360.0020000.0015892.0012704.0010216.008264.006722.005498.004520.003734.003100.002586.002166.001822.601540.001306.401112.60951.00815.80702.20606.40525.60N/AN/AN/AN/AN/AFigure 7: Series CDT Model ChartFigure 9: Elevation ChartFigure 10: Resistance vs TemperatureRESISTANCE VS TEMPERATURE TABLEFigure 8: Series CDTR Model ChartThis 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.DWYER INSTRUMENTS, INC.P.O. BOX 373 • MICHIGAN CITY, INDIANA 46360, U.S.A.Phone: 219/879-8000Fax: 219/872-9057dwyer-inst.come-mail: info@dwyermail.comNext >