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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

Содержание CDT2000 Series

Страница 1: ...y 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 CO2 40 ppm 2 of reading DC model 75 ppm or 10 of ...

Страница 2: ...e unit in an area with good ventilation and an average temperature where it will be responsive to changes to the room conditions The CDT may be mounted on a flat surface Do not locate the CDT where it can be affected by Direct sunlight Drafts or dead areas behind doors Radiant heat from appliances Concealed pipes or chimneys Outside walls or unheated uncooled areas 2 Use the device as a template a...

Страница 3: ...onnect the wires as shown in Figure 2b and 2c WIRING DIAGRAMS CONTINUED Figure 2a Routing the cables 24 V GND CO2 rH Temp Output 0 2 10 V 4 20 mA Output 0 2 10 V 4 20 mA Output 0 2 10 V 4 20 mA Figure 2b Wiring diagram Power input signal output Wires can be routed through the square opening in the back plate Wires can be routed through the top knockouts Wires can be routed through the bottom knock...

Страница 4: ... ufacturer alter the structure of the device the seller is not obligated to make comparable changes to devices already purchased Appealing for warranty requires that the buyer has correctly fulfilled his her duties arisen from the delivery and stated in the contract The seller will give a new warranty for goods that have been replaced or repaired within the warranty however only to the expiration ...

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