HK INSTRUMENTS CDT-MOD-2000 Duct Series Carbon Dioxide Transmitters Instruction Manual
- June 5, 2024
- HK INSTRUMENTS
Table of Contents
CARBON DIOXIDE TRANSMITTERS
CDT-MOD-2000 Duct Series
INSTALLATION
INSTRUCTIONS
INTRODUCTION
Thank you for choosing an HK Instruments CDT-MOD-2000 Duct series carbon
dioxide transmitter with a Modbus interface. The CDTMOD-2000 Duct series is
intended for use in commercial environments in HVAC/R applications. CDT-
MOD-2000 Duct is a carbon dioxide transmitter with temperature output
installed in air ventilation duct. An illuminated display ensures easy
readability also from a distance.
The CDT-MOD-2000 Duct has a screwless lid and an easily adjustable mounting
flange that make the installation of the device easy.
The CDT-MOD-2000 Duct 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 be unoccupied for four hours per day so that the
indoor CO2 concentration drops to the outside level. CDT-MOD-2000-DC Duct is a
dual-channel model with a measuring channel and a reference channel that makes
a continuous comparison and the necessary adjustment accordingly. CDT-
MOD-2000-DC Duct is also suitable for buildings that are continuously
occupied.
APPLICATIONS
CDT-MOD-2000 Duct series devices are commonly used to monitor:
- CO2 and temperature levels of incoming and return air in ventilation systems
- CDT-MOD-2000-DC Duct series devices can also be used in applications where there is a constant source of carbon dioxide present (for example hospitals and greenhouses)
WARNING
- 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
Performance
Measurement ranges:
CO2: 400–2000 ppm Temperature: 0…50 °C
Accuracy: CO2 : ±40 ppm + 3 % of reading, DC model: 75 ppm or 10 % of
reading (whichever is greater) Temperature: <0.5 ºC
Technical Specifications
Media compatibility: Dry air or non-aggressive gases Measuring units: ppm and
°C Measuring element: CO2 : Non-dispersive infrared (NDIR)
Temperature: NTC10k
Calibration: Automatic self-calibration ABC Logic TM or continuous comparison
(DC)
Environment: Operating temperature: 0…50 °C Storage temperature: -20…70 °C
Humidity: 0 to 95 % rH, non condensing
Physical
Dimensions:
Case: 119 x 95.5 x 45 mm
Probe: L=186 mm, d=12 mm
Mounting: With flange, adjustable 40…155 mm
Weight: 150 g
Materials: Case: ABS Cover: PC
Probe: ABS
Protection standard: IP54
Electrical connections: 4 spring-loaded terminals Power supply: (24 V and
GND) 0.2–1.5 mm 2 (16–24 AWG)
Modbus RTU: A and B line 0.2–1.5 mm 2 (16–24 AWG)
Electrical
Supply voltage: 24 VAC or VDC ±10 %
Current consumption: max 230 mA (at 24 V) + 10 mA for each voltage output
Communication
Protocol: MODBUS over Serial Line
Transmission Mode: RTU
Interface: RS485
Byte format (11 bits) in RTU mode: Coding System: 8-bit binary
Bits per Byte:1 start bit
8 data bits, the least significant bit sent
first
1 bit for parity
1 stop bit
Baud rate: selectable in configuration
Modbus address: 1−247 addresses selectable in the configuration menu
Conformance
Meets requirements for:
| CE:| UKCA:
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EMC:| 2014/30/EU| S.I.016/1091
RoHS:| 2011/65/EU| S.I.2012/3032
WEEK:| 2012/19/EU| S.I.2013/3113
COMPANY WITH MANAGEMENT SYSTEM CERTIFIED BY DNV ISO 9001. ISO 14001
SCHEMATICS
DIMENSIONAL DRAWINGS
INSTALLATION
- Mount the device in the desired location (see step 1).
- Route the cables and connect the wires (see step 2).
- The device is now ready for configuration.
WARNING! Apply power only after the device is properly wired.
STEP 1: MOUNTING THE DEVICE
- Select the mounting location (on a duct).
- Use the mounting flange of the device as a template and mark the screw holes.
- Mount the flange on the duct with screws (not included). (Figure 1a)
- Adjust the probe to the desired depth. Ensure that the end of the probe reaches the middle of the duct. (Figure 1b)
- Tighten the screw on the flange to hold the probe in position.
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STEP 2: WIRING DIAGRAMS
For CE compliance a properly grounded shielding cable is required.
- Unscrew the strain relief and route the cable(s).
- Connect the wires as shown in figure 2.
- Tighten the strain relief.
It is recommended to use a shielded twisted pair cable for Modbus cabling. The cable shield must be earthed only in one point, normally, at the end of the main cable.
-
Activate the device Menu by pushing the select button for 2 seconds.
-
Select the address for Modbus: 1…247.
-
Select the baud rate: 9600/19200/38400.
-
Select the parity bit: None/Even/Odd.
-
Select CO2 offset: +-200 CO2 ppm, Offset feature enables field calibration. This is necessary in demanding applications requiring annual calibration.
-
Select temperature offset: +-5 °C or +-9 °F
-
Push the select button to exit menu.
WARRANTY POLICY
The seller is obligated to provide a warranty of five years for the delivered goods regarding material and manufacturing. The warranty period is considered to start on the delivery date of the product. If a defect in raw materials or a production flaw is found, the seller is obligated, when the product is sent to the seller without delay or before the expiration of the warranty, to amend the mistake at his/her discretion either by repairing the defective product or by delivering free of charge to the buyer a new flawless product and sending it to the buyer. Delivery costs for the repair under warranty will be paid by the buyer and the return costs by the seller. The warranty does not comprise damages caused by accident, lightening, flood or another natural phenomenon, normal wear and tear, improper or careless handling, abnormal use, overloading, improper storage, incorrect care or reconstruction, or changes and installation work not done by the seller. The selection of materials for devices prone to corrosion is the buyer’s responsibility unless otherwise is legally agreed upon. Should the manufacturer alter the structure of the device, the seller is not obligated to make comparable changes to devices already purchased. Appealing for a warranty requires that the buyer has correctly fulfilled his/her duties arising 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 of the original product’s warranty time. The warranty includes the repair of a defective part or device, or if needed, a new part or device, but not installation or exchange costs. Under no circumstance is the seller liable for damages compensation for indirect damage.
Copyright HK Instruments 2022
www.hkinstruments.fi
Installation version 7.0 2022
Documents / Resources
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INSTRUMENTS CDT-MOD-2000 Duct Series Carbon Dioxide
Transmitters
[pdf] Instruction Manual
CDT-MOD-2000 Duct Series, Carbon Dioxide Transmitters, Dioxide Transmitters,
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