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Duct Air Quality Sensor
Active sensor (0...10 V) for measuring CO₂
or with integrated temperature sensor. See
options below for integrated sensors. Dual
channel CO₂ technology. NEMA 4X / IP65
rated enclosure.
Type Overview
Technical data sheet 22D..-51
Technical Data
Type
22DC-51
22DTC-51
Electrical Data Power supply DC 15...24V, ±10%, 1.5 W
Power supply AC 24V, ±10%, 2.9 VA
Electrical connection Removable spring loaded terminal block max.
Cable entry Cable gland with strain relief Ø6...8 mm (1/2"
Functional Data
Measuring Data
Sensor Technology CO₂: NDIR (non dispersive infrared) dual
Output signal active note output 0...5/10 V with jumper adjustable
Application air
Measuring values CO₂
Measuring range CO₂ 0...2000 ppm
Measuring range temperature 40...140°F [4...60°C]
Output signal
active CO₂
0...5V, 0...10V -
0...5V, 0...10V 0...5V, 0...10V
Output signal
active
temperature
2.5 mm²
NPT conduit adapter included)
channel
voltage output: min. 10 kΩ load
temperature
Accuracy CO₂ ±(50 ppm + 3% of measuring value)
Accuracy temperature active ±0.9°F @ 70°F [±0.5°C @ 21°C]
Materials
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Cable gland PA6, black
Housing cover: lexan, orange
base: lexan, orange
seal: 0467 NBR70, black
UV resistant
Probe material PA6, black
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Safety Notes
Technical data sheet 22D..-51
Safety Data Ambient humidity max. 95% r.H., non-condensing
Fluid humidity max. 95% r.H., non-condensing
Ambient temperature 30...120°F [0...50°C]
Fluid temperature 30...120°F [0...50°C]
Operating condition air flow min. 1 ft/s [0.3 m/s]
max. 40 ft/s [12 m/s]
Protection class IEC/EN III safety extra-low voltage (selv)
Protection class UL UL Class 2 Supply
EU Conformity CE Marking
Certification IEC/EN IEC/EN60730-1
Certification UL cULus acc. to UL60730-1A/-2-9, CAN/CSA
E60730-1:02/-2-9
Degree of protection IEC/EN IP65
Degree of protection NEMA/UL NEMA4X
Quality Standard ISO 9001
This device has been designed for use in stationary heating, ventilation and air-conditioning
systems and must not be used outside the specified field of application. Unauthorised
modifications are prohibited. The product must not be used in relation with any equipment
that in case of a failure may threaten humans, animals or assets.
Ensure all power is disconnected before installing. Do not connect to live/operating
equipment.
Only authorised specialists may carry out installation. All applicable legal or institutional
installation regulations must be complied during installation.
The device contains electrical and electronic components and must not be disposed of as
household refuse. All locally valid regulations and requirements must be observed.
Remarks
General Remarks Concerning Sensors
Build-up of Self-Heating by Electrical
Dissipative Power
Information Self-Calibration Feature CO₂
Sensing devices with a transducer should always be operated in the middle of the
measuring range to avoid deviations at the measuring end points. The ambient temperature
of the transducer electronics should be kept constant. The transducers must be operated at
a constant supply voltage (±0.2 V). When switching the supply voltage on/off, onsite power
surges must be avoided.
Temperature sensors with electronic components always have a dissipative power which
affects the temperature measurement of the ambient air. The dissipation in active
temperature sensors shows a linear increase with rising operating voltage. This dissipative
power should be taken into account when measuring temperature. As Belimo transducers
work with a variable operating voltage, only one operating voltage can be taken into
consideration, for reasons of production engineering. Transducers 0...10 V / 4...20 mA have
a standard setting at an operating voltage of DC 24 V. That means, that at this voltage, the
expected measuring error of the output signal will be the least. For other operating voltages,
the offset error will be increased by a changing power loss of the sensor electronics. If a recalibration should become necessary later directly on the sensor, this can be done by
means of a trimming potentiometer on the sensor board.
All CO₂ sensors are subject to drift caused by the aging process of the components,
resulting in regular re-calibration or replacement of units. However, the dual channel
technology integrates automatic self-calibration technology vs. common used ABC-Logic
sensors. Dual channel self-calibration technology is ideally suited for applications operating
24/7 hours such as those in hosiptals or other commerical applications. Manual calibration
is not required.
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Scope of delivery
Accessories
Wiring Diagram
Technical data sheet 22D..-51
Scope of delivery Description Type
Mounting flange for duct sensor 19.5 mm, up to max. 120°C [248°F],
Plastic
1/2" NPT conduit adapter
Optional accessories Description Type
Replacement filter, wire mesh, Stainless steel A-22D-A06
Mounting plate L housing A-22D-A10
A-22D-A34
① Status LED
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Dimensions
Technical data sheet 22D..-51
Dimensions
.
Type
22DC-51
22DTC-51
Probe length Weight
7" [180 mm] 0.57lb [0.26kg]
7" [180 mm] 0.62lb [0.28kg]
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