Description
The CDD4 Series CO2 transmitter uses a highly accurate and reliable Non-dispersive Infrared (NDIR) with state-of-the-art digital linearization and temperature compensated circuitry in an outside mount to detect CO2 levels and provides a linear analog signal output of 4-20 mA, 0-5 or 0-10 Vdc signals. The CDD4 is available with a range 0-20,000 ppm (Dual-channel). Parameters are set up via the concealed LCD display. Various precision thermistors or RTD’s are also available as an optional temperature output.
Features
- Menu driven set-up
- 20,000 (Dual-channel) PPM CO2 range
- Patented self-calibration algorithm
- Guaranteed 5 year calibration interval
- Optional Temperature Sensor Outputs
- Easily field calibrated
Specifications
-
Range....................................0 - 2000 ppm standard,
programmable span from 2000 to 20,000 ppm - Accuracy ..............................±75 PPM or 10% of reading (whichever is greater)
- Sensor.......................................Dual Channel Non-Dispersive Infrared (NDIR), diffusion sampling
- Sensor Coverage Area ....100 m² (1000 ft²) typical
- Temp. Dependence .........0.2% FS per °C
- Stability................................< 5 % FS over life of sensor
- Sensor Life Span ...............15 years typical
- Press. Dependence ..........0.13% of reading per mm Hg
- Altitude Correction ..........Programmable from 0-5000 ft via keypad
- Response Time ..................<2 minutes for 90% step change typical
- Warm-up Time...................<2 minutes
- Power Supply.....................20-28 Vac/dc (non-isolated half-wave rectified)
- Output Signals...................4-20 mA active (sourcing), 0-5 Vdc or 0-10 Vdc (field selectable)
-
Consumption.....................Heated: 1.0 A max @ 24 Vdc 1.1 A max @ 24 Vac
Unheated: 100 mA max @ 24 Vdc 185 mA max @ 24 Vac -
Output Drive Capability.....Current: 550 ohms max
Voltage: 10 Kohm min - Output Resolution ...........10 bit PWM
- Protection Circuitry..........Reverse voltage & overvoltage protected
-
Operation Conditions .....Heated: -40˚- 50°C (-40˚-122°F)
Unheated: 0˚- 50°C (32˚-122°F)
0-95% RH non-condensing - Wiring Connections.........Screw terminal block (14 to 22 AWG)
- External Dimensions .......110mm W x 180mm H x 89mm D (4.3” x 7.125” x 3.5”)
- Enclosure Ratings.............IP65 (NEMA 4X)
Optional Temperature Signal:
- Sensing Element...............Various RTDs or thermistors as a 2-wire resistance output
Optional Relay Output:
- Contact Ratings.................Form A contact (N.O.), 2 Amps @ 140 Vac, 2 Amps @ 30 Vdc
- Relay Trip Point..................Programmable 500-15,000 ppm
- Relay Hysteresis ................Programmable 25-500 ppm
Concealed LCD Display (Used for setting parameters):
- Resolution ...........................1 ppm CO2
-
Size.........................................1.4” w x 0.6” h (35 mm x 15 mm)
Alpha-numeric 2 line x 8 character - Backlight..............................Enable or disable via keypad