Copyright HK Instruments 2017
www.hkinstruments.fi
Installation version 5.0 2017
INSTALLATION
INSTRUCTIONS
CARBON DIOXIDE TRANSMITTERS
CDT2000 Series
• READ THESE INSTRUCTIONS CAREFULLY BEFORE
ATTEMPTING TO INSTALL, OPERATE OR SERVICE THIS
DEVICE.
• Failure to observe safety information and comply with
instructions can result in PERSONAL INJURY, DEATH AND/OR
PROPERTY DAMAGE.
• To avoid electrical shock or damage to equipment, disconnect
power before installing or servicing and use only wiring with
insulation rated for full device operating voltage.
• To avoid potential fire and/or explosion do not use in potentially
flammable or explosive atmospheres.
• Retain these instructions for future reference.
• This product, when installed, will be part of an engineered
system whose specifications and performance characteristics
are not designed or controlled by HK Instruments. Review
applications and national and local codes to assure that the
installation will be functional and safe. Use only experienced and
knowledgeable technicians to install this device.
SPECIFICATIONS
Thank you for choosing an HK Instruments CDT2000 series carbon
dioxide transmitter. The CDT2000 series is intended for use in com
-
mercial environments in HVAC/R applications.
The CDT2000 series measures carbon dioxide (CO
2
), utilizing the in
-
dustry standard NDIR measurement principle, and temperature (T).
Optional relative humidity (rH) measurement is also available in the
same device. Each measurement parameter (CO
2
, rH, T) has a sepa
-
rate field configurable output.
The CDT2000 series carbon dioxide transmitters are available with
Modbus configuration, relay and touchscreen display.
The CDT2000 series transmitters calibrate themselves automati
-
cally using ABC
TM
logic. The ABC
TM
logic requires that the space in
which the transmitter is used needs to to be unoccupied for four
hours per day so that the indoor CO
2
concentration drops to the out
-
side level. CDT2000-DC is a dual channel model with a measuring
channel and a reference channel that makes a continuous compari
-
son and the necessary adjustment accordingly. CDT2000-DC is also
suitable for buildings that are continuously occupied.
• humidity in various industrial applications
• temperatures in HVAC/R environment
• CDT2000-DC series devices can also be used in applications where
there is a constant source of carbon dioxide present (for example
hospitals and greenhouses)
SPECIFICATIONS
Performance
Measurement ranges
:
CO
: 400–2000 ppm
Temperature: 0...50 °
°F
32...122
/
C
Relative humidity: 0–100 %
Accuracy:
CO
2
: ±40 ppm + 2 % of reading, DC model: 75 ppm or
10 % of reading (whichever is greater)
Temperature: <0.5 º
°F
<0.9
/
C
Relative humidity: ±2...3 % at 0...50 °C and 10–90 % rH
Total error band includes accuracy, hysteresis and
temperature effect over 5...50 °C and 10–90 % rH.
Technical Specifications
Media compatibility:
Dry air or non-aggressive gases
Measuring units:
ppm, °C and % rH
Measuring element:
CO
2
: Non-dispersive infrared (NDIR)
Temperature: Pt1000
Relative humidity: Thermoset polymer capacitive
sensing element
Calibration:
Automatic self-calibration ABC Logic
TM
or continuous
comparison (DC)
Environment:
Operating temperature: 0...50 °
°F
32...122
/
C
Storage temperature: -20...70 °
°F
-4...158
/
C
Humidity: 0 to 95 % rH, non condensing
Physical
Dimensions:
Case: 99 x 90 x 32 m
1.26"
x
3.54
x
3.90
/
m
Weight:
150
oz
5.30
/
g
Mounting:
3 screw holes slotted, 3.8 mm
Materials:
Case: ABS
Protection standard:
IP20
Display (Optional)
Touchscreen
Size: 77.4 x 52.4 mm
Electrical connections:
Power supply:
5-screw terminal block
(24 V, GND, CO
2
, rH, T)
0.2–1.5 mm
2
(12–24 AWG)
Relay out:
3-screw terminal block
(NC, COM, NO)
0.2–1.5 mm
2
(12–24 AWG)
Electrical
Input: 24 VAC or VDC, ±10 %
Current consumption: max 90 mA (at 24 V) +
10 mA for each voltage output or 20 mA for
each current output
CO
2
output signal:
0–10 V, R>1 kΩ
2–10 V, R>1 kΩ
4–20 mA, R<500 Ω
Temperature output signal:
0–10 V, R>1 kΩ
2–10 V, R>1 kΩ
4–20 mA, R<500 Ω
Relative humidity output signal:
0–10 V, R>1 kΩ
2–10 V, R>1 kΩ
4–20 mA, R<500 Ω
Relay out:
SPDT Relay, 250 VAC / 30 VDC / 6 A
Adjustable switching point and hysteresis
Conformance
Meets requirements for CE marking:
EMC Directive 2014/30/EU
RoHS Directive 2011/65/EU
LVD Directive 2014/35/EU
WEEE Directive 2012/19/EU
INTRODUCTION
APPLICATIONS
WARNING
CDT series devices are commonly used to monitor:
• CO
2
and humidity levels in offices, public spaces, meeting rooms
and classrooms
• CO
2
levels of return air in ventilation systems
• incoming air and return air humidity levels in ventilation system
COMPANY WITH
MANAGEMENT SYSTEM
CERTIFIED BY DNV GL
= ISO 9001 = ISO 14001 =
RoHS 2
2011/65/EU
