Copyright HK Instruments, Inc. 2017
www.hkinstrumentsinc.com
Installation version 2.0 2017
INSTALLATION
INSTRUCTIONS
CARBON DIOXIDE TRANSMITTERS
CDT 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.
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, touchscreen display, and NIST standard
calibration certificates.
The CDT2000 series transmitters calibrate themselves automatically
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 outside level.
CDT2000-DC is a dual channel model with a measuring channel and
a reference channel that makes a continuous comparison and the
necessary adjustment accordingly. CDT2000-DC is also suitable for
buildings that are continuously occupied.
SPECIFICATIONS
Performance
Measurement range:
CO
2
: 400–2,000 ppm
Temperature: 32−122 °F
Relative Humidity: 0–90 %
Accuracy:
CO
2
: ±40 ppm + 2 % of reading, DC model: 75 ppm or
10 % of reading (whichever is greater)
Temperature: <0.9 °F
Relative Humidity: ±4 % max @32−122 °F
and 0–90 % rH
Total error band includes accuracy, hysteresis and
temperature effect over 41–122 °F and
10–90 % rH.
Technical Specifications
Media Compatibility:
Dry air or non-aggressive gases
Measuring units:
ppm, °F and %
Measuring element:
CO
2
: Non Dispersive Infrared (NDIR)
Temperature: Pt1000
Relative Humidity: Thermoset polymer capacitive
sensing element
Environment:
Operating Temperature: 32−122 °F (0−50 °C)
Storage Temperature: -4−158 °F (-20−70 °C)
Humidity: 0 to 95 % rH, non condensing
Physical
Case:
Dimensions: 3.93” x 3.57” x 1.26”
(99.87 x 90.75 x 31.99 mm)
Weight: 4.82 oz (150 g)
Mounting: 3 screw holes slotted, 11/64” ø (3.8 mm)
Materials: Case: ABS (UL 94 V-0 Approved)
Protection standard: IP20
Display
(Optional)
Touchscreen
Size: 3.05” W x 2.06” H
(77.4 x 52.4 mm)
Electrical Connections:
Power Supply: 5-screw terminal block
(24 V, GND, CO
2
, rH, Temp)
12–24 AWG (0.2–1.5 mm
2
)
Relay Out: 3-screw terminal block
(NC, COM, NO)
12–24 AWG (0.2–1.5 mm
2
)
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
4–20mA, 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:
3-screw terminal block
(NC, COM, NO)
12–24 AWG (0.2–1.5 mm
2
)
SPDT Relay, 250 VAC / 30 VDC / 6 A
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
WARNING
AVERTISSEMENT
• LISEZ ATTENTIVEMENT CES INSTRUCTIONS AVANT DE PROCÉDER À
L’INSTALLATION, LA MISE EN SERVICE OU L’ENTRETIEN DE CET APPAREIL.
• Le non-respect des informations et instructions de sécurité peut entraîner DES
DOMMAGES CORPORELS, LA MORT ET/OU DES DÉGÂTS MATÉRIELS.
• Afin d’éviter les chocs électriques et les dommages matériels, déconnectez
l’alimentation électrique avant l’installation ou l’entretien, et utilisez uniquement du
câblage avec isolement assigné pour une tension d’alimentation optimale.
• Afin de prévenir les risques d’incendie et/ou d’explosion, n’utilisez pas l’appareil
dans des environnements potentiellement inflammables ou explosifs.
• Conservez ces instructions à titre de référence.
• Une fois installé, ce produit fera partie d’un système technique dont les
spécifications et les caractéristiques de performance ne sont ni conçues ni
contrôlées par HK Instruments. Consultez les applications et les codes nationaux
et locaux pour garantir le fonctionnement correct et sûr de l’installation. Ne faites
appel qu’à des techniciens expérimentés et compétents pour installer cet appareil.
APPLICATIONS
• 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)
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 extract air in ventilation systems
• supply air and extract air humidity levels in ventilation system
RoHS 2
2011/65/EU
COMPANY WITH
MANAGEMENT SYSTEM
CERTIFIED BY DNV GL
= ISO 9001 = ISO 14001 =
