Bard Carbon Dioxide Transmitter 8403-096 Instructions

**Bard Carbon Dioxide Transmitter 8403-096 Instructions

**

SUPPLEMENTAL INSTRUCTIONS

8403-096 Carbon Dioxide Transmitter (Dwyer® CDT-2N40-LCD-RLY 002 Sensor)

Series CDT 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. For increased sensor life, a single-beam dual-wavelength nondispersive infrared (NDIR) sensor is used to automatically correct the measurement in both occupied and unoccupied buildings against aging effects. The single-beam dualwavelength 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 4-20 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 applications that require visual indication, the Series CDT 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. The CDT can be configured to display temperature only,

CO2 only or CO2 and temperature 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.

Bard Manufacturing Company, Inc. Bryan, Ohio 43506
www.bardhvac.com

Manual: 7960-902
Supersedes: NEW
Date: 3-1-21

SPECIFICATIONS

Sensor: Single beam, dual-wavelength NDIR.
Range: CO2: 0 to 2000 or Oto 5000 PPM (depending on model); Temperature: 32 to 122°F (0 to 50°C).
Accuracy: CO2: ±40 PPM ±3% of reading; 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: 16-35 VDC or 19-28 VAC.
Power Consumption: Average: 2 w; Peak: 3.75 w.
Output: Current: 4-20 mA (max. 500 O); Voltage: 0-5 VDC or 0-10 VDC (min. 500 O); Relay: SPST NO rated 2A@ 30 VDC; RTD or thermistor per r-t curves on page 6 (depending on model).
Weight: 4.4 oz (125 g).
Agency Approvals: CE.

INSTALLATION

Caution:
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.
Notice: Use electrostatic discharge precautions (e.g., use of wrist straps) during installation and wiring to prevent equipment damage.
Notice: Avoid locations where severe shock or vibration, excessive moisture or corrosive fumes are present.
Notice: Do not exceed ratings of this device, permanent damage not covered by warranty may result.
Notice: Upon powering the transmitter, the firmware version will fiash on the display. A warm up period of 30 minutes is required for the transmitter to adjust to the current CO2 concentration.
Notice: Self calibration feature of the transmitter requires exposure to normal outdoor equivalent carbon dioxide level once every 30 days.

MOUNTING

1. 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.
   FIGURE 1
   Removal of Cover from Back Plate
   

WIRING
Use maximum 18 AWG wire for wiring to terminals. Refer to Figure 4 for wiring information.

DIP SWITCH SETTINGS
To 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.
FIGURE 2 Diagram of Circuit Board

FIGURE 3

DIP Switch Position 1: CO2 Output Selection
ON: Output set to voltage output
OFF: Output set to current output

DIP Switch Position 2: Temperature Output Selection
ON: Output set to voltage output
OFF: Output set to current output
DIP Switch Positions 3 & 4: Current or Voltage Output Range Selection

DIP Switch Position 5: Menu Access
ON: Menu Enabled
OFF: Menu Disabled

CURRENT/VOLTAGE OUTPUT
On the Series CDT, 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.

Optional relay can be used as either a dry contact or low voltage switched circuit up to 2 A at 30 VDC
FIGURE 4 Active Output Wiring Diagram

REMOTE DISPLAY
For models that are ordered without an integral LCD display, remote display Model A-449 can be used to display the temperature, 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 only temperature or only carbon dioxide.

EDITING MENU PARAMETERS
Before 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 PARAMETERS

Step 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.
FIGURE 5 Side View of Transmitter

MENU DESCRIPTIONS

• RON Relay on set point
  Sets the CO2 concentration which the optional relay is energized.

• ROF 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 button and Down button 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)

• DSP Display configuration
  Determines the LCD display configuration during normal operation. The LCD display can indicate the CO2 concentration, temperature and CO2 concentration.

• CT CO2 concentration and temperature |
  C CO2 concentration only
  T Temperature only

• UNI 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

• COL CO2 low output range
  Sets the CO2 concentration for the lowest output (4 mA or O VDC).
  Low limit: 0 PPM
  Factory setting: 0 PPM
  High limit: 2000/5000 PPM (depending on model)

• COH CO2 high output range
  Sets the CO2 concentration for the highest output (20 mA, 5 VDC or 1O 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)

• 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

• TOL Temperature low output range (Series CDT with active temperature only)
  Sets the temperature for the lowest output (4 mA or O VDC).
  Low limit: 32.0°F/0.0°C
  Factory setting: 32.0°F/0.0°C
  High limit: 122.0°F/150.0°C

• TOH Temperature 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°C
  Factory setting: 122.0°F/150.0°C
  High limit: 122.0°F/150.0°C

• 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 Table 1 for typical barometric pressures at a given elevation.
  Low limit: 20.0 in Hg/677 hPa
  Factory setting: 29.9 in Hg/1013 hPa
  High limit: 32.0 in Hg/1084 hPa

• CAL Calibration
  Calibrates the carbon dioxide sensor to a known gas value. Read CALIBRATING SENSOR below before using this feature. Hold Enter button for 5 seconds.

• RST Reset to Factory Defaults
  Resets all menu settings lo 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

CALIBRATING 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).
  FIGURE 6 Calibration
  

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

• Step 6: Press and hold the Up and Down buttons simultaneously for 5 seconds to enter the menu parameters. The display will show the “RON” parameter.

• Step 7: Press the Up or Down button to access the calibration parameter menu which will display as “CAL”.

• Step 8: Press the Enter button. “SET” will then appear on the display.

• Step 9: Press the Down arrow for 3 seconds. All dashes will appear on the display, then release the button. Then after 10 seconds “SET” will disappear.

• Step 10: Exit the parameter menu by pressing and holding the Up and Down buttons simultaneously for 5 seconds or wait 10 seconds.

• Step 11: Flow the full scale reference gas at 0.3 SLPM for 5 minutes.

• Step 12: Repeat steps 6 through 8. Step 13: Press the Up arrow for 3 seconds. All dashes will appear on the display, then release the button. Then after 10 seconds “SET” will disappear.

• Step 14: Exit the parameter menu by pressing and holding the Up and Down buttons simultaneously for 5 seconds or wait 10 seconds.

• Step 15: Disconnect the power supply from the power source and remove the terminal block from the circuit board.

• Step 16: Remove tubing from sensor and re-attach the gas nipple cover to the sensor.

• Step 17: Re-attach the cover to the back plate.

MAINTENANCE

Upon final installation of the Series CDT, no routine maintenance is required. The Series CDT are not field 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.

TABLE 1 Elevation

US
Customary Units

|

SI
Units

---|---
ft| in Hg| m| hPa
0| 29.92| 0| 1013
400| 29.50| 100| 1002
800| 29.10| 200| 990
1200| 28.69| 300| 979
1600| 28.29| 400| 968
2000| 27.90| 500| 957
2400| 27.51| 600| 946
2800| 27.13| 700| 935
3200| 26.76| 800| 924
3600| 26.39| 900| 914
4000| 26.02| 1000| 904
4400| 25.66| 1100| 893
4800| 25.30| 1200| 883
5200| 24.95| 1300| 873
5600| 24.60| 1400| 863
6000| 24.26| 1500| 853
6400| 23.93| 1600| 844
6800| 23.60| 1700| 834
7200| 23.27| 1800| 824
7600| 22.94| 1900| 815
8000| 22.63| 2000| 806
8400| 22.31| 2100| 797
8800| 22.00| 2200| 787
9200| 21.70| 2300| 779
9600| 21.40| 2400| 770
10000| 21.40| 2500| 761

TABLE 2 Resistance vs. Temperature

Temperature

|

Resistance Curves (in Ω)

---|---
°C| °F| A| B| C| D| E| F
-55| -67.0| 607800.00| 963849.00| 289154.70| 78.32| 783.2| 2394000.00
-50| -58.0| 441200.00| 670166.00| 201049.80| 80.31| 803.1| 1646200.00
-45| -49.0| 323600.00| 471985.00| 141595.50| 82.29| 822.9| 1145800.00
-40| -40.0| 239700.00| 336479.00| 100943.70| 84.27| 842.7| 806800.00
-35| -31.0| 179200.00| 242681.00| 72804.30| 86.25| 862.5| 574400.00
-30| -22.0| 135200.00| 176974.00| 53092.20| 88.22| 882.2| 413400.00
-25| -13.0| 102900.00| 130421.00| 39126.30| 90.19| 901.9| 300400.00
-20| -4.0| 78910.00| 97081.00| 29124.30| 92.16| 921.6| 220600.00
-15| 5.0| 61020.00| 72957.00| 21887.10| 94.12| 941.2| 163500.00
-10| 14.0| 47540.00| 55329.00| 16598.70| 96.09| 960.9| 122280.00
-5| 23.0| 37310.00| 42327.00| 12698.10| 98.04| 980.4| 92240.00
0| 32.0| 29490.00| 32650.00| 9795.00| 100.00| 1000.0| 70160.00
5| 41.0| 23460.00| 25392.00| 7617.60| 101.95| 1019.5| 53780.00
10| 50.0| 18780.00| 19901.00| 5970.30| 103.90| 1039.0| 41560.00
15| 59.0| 15130.00| 15712.00| 4713.60| 105.85| 1058.5| 32340.00
20| 68.0| 12260.00| 12493.00| 3747.90| 107.79| 1077.9| 25360.00
25| 77.0| 10000.00| 10000.00| 3000.00| 109.74| 1097.4| 20000.00
30| 86.0| 8194.00| 8057.00| 2417.10| 111.67| 1116.7| 15892.00
35| 95.0| 6752.00| 6531.00| 1959.30| 113.61| 1136.1| 12704.00
40| 104.0| 5592.00| 5326.00| 1597.80| 115.54| 1155.4| 10216.00
45| 113.0| 4655.00| 4368.00| 1310.40| 117.47| 1174.7| 8264.00
50| 122.0| 3893.00| 3602.00| 1080.60| 119.40| 1194.0| 6722.00
55| 131.0| 3271.00| 2986.00| 895.80| 121.32| 1213.2| 5498.00
60| 140.0| 2760.00| 2488.00| 746.40| 123.24| 1232.4| 4520.00
65| 149.0| 2339.00| 2083.00| 624.90| 125.16| 1251.6| 3734.00
70| 158.0| 1990.00| 1752.00| 525.60| 127.08| 1270.8| 3100.00
75| 167.0| 1700.00| 1480.00| 444.00| 128.99| 1289.9| 2586.00
80| 176.0| 1458.00| 1255.00| 376.50| 130.90| 1309.0| 2166.00
85| 185.0| 1255.00| 1070.00| 321.00| 132.80| 1328.0| 1822.60
90| 194.0| 1084.00| 915.50| 274.65| 134.71| 1347.1| 1540.00
95| 203.0| 939.30| 786.60| 235.98| 136.61| 1366.1| 1306.40
100| 212.0| 816.80| 678.60| 203.58| 138.51| 1385.1| 1112.60
105| 221.0| 712.60| 587.60| 176.28| 140.40| 1404.0| 951.00
110| 230.0| 623.60| 510.60| 153.18| 142.29| 1422.9| 815.80
115| 239.0| 547.30| 445.30| 133.59| 144.18| 1441.8| 702.20
120| 248.0| 481.80| 389.60| 116.88| 146.07| 1460.7| 606.40
125| 257.0| 425.30| 341.90| 102.57| 147.95| 1479.5| 525.60
130| 266.0| 376.40| 301.00| 90.30| 149.83| 1498.3| N/A
135| 275.0| 334.00| 265.80| 79.74| 151.71| 1517.1| N/A
140| 284.0| 297.20| 235.30| 70.59| 153.58| 1535.8| N/A
145| 293.0| 265.10| 208.90| 62.67| 155.46| 1554.6| N/A
150| 302.0| 237.00| 186.10| 55.83| 157.33| 1573.3| N/A

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