SplusS KLQ-CO2-MB CO2 & Airquality Sensor Instruction Manual

SplusS KLQ-CO2-MB CO2 & Airquality Sensor

Product Specifications

• Product Name: CO2 & Airquality Sensor Type KLQ-CO2-MB
• Measurement Range: CO2 content, VOC (Volatile Organic Compounds)
• Accuracy: Calibratable
• Connection: Modbus
• Protection Class: IPXX (Not specified in the manual)
• Standards Compliance: Not specified

Mounting Instructions

1. Ensure the area where the sensor will be mounted is suitable for accurate readings.
2. Use the provided mounting flange to securely attach the sensor in the desired location.
3. Follow the dimensional drawing provided in the manual for proper positioning of the sensor.

Configuration
To configure the sensor

• Set the Modbus address using the DIP switches as per the specified configuration.
• Adjust the bus parameters including baud rate and parity based on your requirements.
• Ensure proper communication settings for seamless integration.

Telegram Instructions

The sensor supports various telegram functions:

• Function 04: Read Input Register – Use this to read specific data registers for monitoring.
• Function 05: Write Single Coil – Write to a specific coil for control purposes.

Frequently Asked Questions (FAQ)

1. Q: What is the typical lifespan of the CO2 sensor?
   A: The CO2 sensor has a specified lifespan, but it can be extended through proper maintenance and calibration.
   Q: How do I know if the sensor is functioning correctly?
   A: The sensor has an integrated diagnostic function for error checking. Refer to the manual for troubleshooting steps.

Operating and Mounting Instructions

Duct sensors incl. mounting flange, measuring transducers for air quality (VOC) and CO2 content, calibratable, with Modbus connection

Type KLQ-CO2-MB

Patented quality product (patent no. DE 10 2014 010 719.1)

The maintenance-free duct sensor Type KLQ-CO2-MB with Modbus connection, automatic calibration, in an impact-resistant plastic housing with quick- locking screws, incl. mounting flange, optionally with/without display, for determining the CO2-content of the air (0…5000 ppm) and of the air quality (0…100 % VOC). The following parameters can be accessed via the Modbus: air quality (VOC), carbon dioxide (CO2) and atmospheric pressure. The sensor is used in offices, hotels, convention centres, apartments, shops, etc. for the purpose of evaluating the indoor climate. This enables energy-saving room ventilation on an as-needed basis, thereby reducing operating costs and improving well-being. One sensor for every 30 m² of space is recommended.
The CO2 measurement is performed using an optical NDIR sensor (non-dispersive infrared technology). The detection range is calibrated for standard applications such as monitoring residential rooms and conference rooms.

The air quality is detected by a VOC sensor (mixed gas sensor for volatile organic substances). This sensor determines the loading of the room air due to contaminated gases such as cigarette smoke, body perspiration, exhaled breathing air, solvent vapours, emissions etc. With regard to the expected air contamination, low, medium or high VOC sensitivity can be selected.
Innovative Modbus sensor with galvanically separated RS485-Modbus interface, selectable bus termination resistance, DIP switch for setting the bus parameters and bus address in the current-free state, internal LEDs for telegram status display, two separate push-in terminals. The sensor is factory-calibrated; an environmental precision adjustment by an expert is possible.

Type KLQ-CO2-MB

Manual setting of the offset

The sensors are pre-set and calibrated at the factory.
Each measuring channel has a separate offset potentiometer for subsequent adjustment of the measurement.
The adjusting range is ± 10 % of the measuring range (VOC / CO2).

KLQ – CO2 – MB| Duct| sensor| for| air| quality| (VOC)| and| CO2| content,| Deluxe
---|---|---|---|---|---|---|---|---|---|---
Type| Danfoss

Part Number

Type KLQ-CO2-MB

Installation and Commissioning

ATTENTION!
The minimum CO2 concentration of outdoor air amounts to approx. 350 ppm in leafy, hardly industrialised areas. Gas inter-exchange in the sensor element happens by diffusion. Depending on the changes to the concentration and the flow velocity of the air surrounding the sensor, the reaction of the device to the change of concentration may take place with a delay. It is essential to choose an installation location for the duct sensor in which that the air stream “presses” into the duct tube. It is essential to choose an installation location for the on-wall sensor in which the air stream flows around the sensor. Otherwise the gas exchange may be considerably delayed or prevented.

Commissioning
After the device is switched on, a self-test and temperature equalisation are performed.
Depending on the ambient conditions, this process takes 30-50 minutes (as an option, manual calibration can now be performed).

If commissioning with automatic calibration, proceed as follows

1. Open all windows or set the air conditioning system to use outdoor air
2. Switch on the device and move away from the device. If possible, all persons should leave the room.
3. The device is ready to use after 50 minutes.

Automatic calibration of the CO2 measurement
The regular exchange of fresh air is all that is required for the self- calibration technology in the sensor (CO2 concentrations: 350-500 ppm).
The device detects this condition and performs the calibration automatically. It is sufficient to open the windows or set the air conditioning system to use outdoor air at regular intervals and to stop all CO2-producing processes that influence the ambient air.

Proceed as follows:

• Open all windows fully or set the air conditioning system to use outdoor air 1x weekly for 15-20 minutes.
• If possible, all persons should leave the room during this time.
• Regular ventilation of the rooms and flushing of the duct with fresh air will increase the measuring accuracy of the sensor.
• Automatic zero point calibration is deactivated by default in the as-delivered condition and, if required, must be activated using the Modbus.

Manual calibration of CO2 measurement
Manual calibration can be carried out independently of automatic calibration.
Sufficient fresh air must be provided before and during the calibration procedure (CO2 concentration: 350-500 ppm).
Also make sure that no CO2-producing processes influence the ambient air.

Proceed as follows to perform manual calibration

1. Preparation: Remove the housing cover and open all windows or set the air conditioning system to use outdoor air.

2. Press and hold the “ZERO CO2” button until the flashing LED row changes to a steady light after 5 seconds.
   The calibration process has started. Keep the windows open or the air conditioning system set to use outdoor air.

3. If possible, all persons should now leave the room.

4. After 10 minutes, the calibration is complete (status LED has gone out, the countdown is complete) and the device should transmit a CO2 concentration of between 350-500 ppm.

Automatic calibration of the VOC measurement (permanently active)

• The regular exchange of fresh air is all that is required for the self-calibration technology in the sensor. The device detects this condition and performs the calibration automatically. It is sufficient to open the windows or set the air conditioning system to use outdoor air at regular intervals. Make sure that no harmful substances influence the ambient air during this process. Proceed as follows:
• Open all windows fully or set the air conditioning system to use outdoor air 1x weekly for 15-20 minutes.
• During this time, the release of gases from volatile organic substances must be prevented as far as possible.
• Regular ventilation of the rooms and flushing of the duct with fresh air will increase the measuring accuracy of the sensor.
• Every time the device is switched on, the automatic calibration cycle restarts and calculates a correction value across the operating period.
• In case of power disruptions of less than 7 days, the calculation algorithm may be supported with a manual calibration to adjust the correction value more quickly.

Manual calibration of the VOC measurement

• Manual calibration can be carried out independently of automatic calibration.
• Sufficient fresh air must be provided before and during the calibration procedure.
• Also make sure that no harmful substances influence the ambient air.

Proceed as follows to perform manual calibration

1. Preparation: Prevent the release of gases from volatile organic substances as far as possible, open windows and set air conditioning system to use outdoor air, remove the housing cover and wait 15 minutes.

2. Press and hold the “ZERO VOC” button until the flashing LED row changes to a steady light after 5 seconds.
   The calibration process has started. Keep the windows open or the air conditioning system set to use outdoor air.

3. After 60 seconds, the calibration is complete (status LED has gone out, the countdown is complete) and the device transmits the current VOC concentration.

BUS ADDRESS

• The device address in the range of 1 to 247 is set at DIP switch [A].
• For switch positions 1 to 8 see the table on the back!
• Address 0 is reserved for broadcast messages.
• Addresses greater than 247 must not be assigned and are ignored by the device.

The DIP switches are binary-coded with the following values

• DIP 1 = 128 ………… DIP 1 = ON
• DIP 2 = 64 ………… DIP 2 = ON
• DIP 3 = 32 ………… DIP 3 = OFF
• DIP 4 = 16 ………… DIP 4 = OFF
• DIP 5 = 8 ………… DIP 5 = OFF
• DIP 6 = 4 ………… DIP 6 = OFF
• DIP 7 = 2 ………… DIP 7 = OFF
• DIP 8 = 1 ………… DIP 8 = ON

The switch positions shown here result in the Modbus address 128 + 64 + 1 = 193

BUS PARAMETERS

Parity

(selectable)

| DIP 3
---|---
EVEN (numbered)| **O N
ODD (numbered)| ** OFF
Parity check

(on / off)

| DIP 4
---|---
Active (1 stop bit)| O N
Inactive (no parity) (2 stop bits)| OFF
8N1 mode

(on / off)

| DIP 5
---|---
Active| O N
Inactive (default)| OFF
Bus termination

(on/off)

| DIP 6
---|---
Active| O N
Inactive| OFF

• The baud rate (speed of transmission) is set at DIP switches 1 and 2 of DIP switch block [B].
• Selectable are 9600 baud, 19200 baud, or 38400 baud – see table!
• Parity is set at DIP switch 3 of DIP switch block [B].
• Selectable are EVEN or ODD – see table!
• Parity check is activated via DIP switch 4 of DIP switch block [B].
• Selectable are active (1 stop bit), or inactive (2 stop bits), i.e. no parity check – see table!
• The 8N1 mode is activated via DIP switch 5 of DIP switch block [B].
• The functionality of DIP switch 3 (parity) and DIP switch 4 (parity check) of DIP switch block [B] is therefore deactivated. Selectable are 8N1 active or inactive (default) – see table !.
• Bus termination is activated via DIP switch 6 of DIP switch block [B].
• Selectable are active (bus termination resistance of 120 Ohm), or inactive (no bus termination) – see table!

COMMUNICATION INDICATOR

Communication is indicated via two LEDs. Error-free received telegrams are signalized by the green LED lighting up, regardless of the device address. Faulty telegrams or triggered Modbus exception telegrams are depicted by the red LED lighting up.

DIAGNOSTICS

An error diagnostic function is integrated

TELEGRAMS
Function 04 Read Input Register

hPa
3×0010| Atmospheric pressure| Filtering 32 s| Signed 16 Bit| 700…1100| 700…1110 hPa
3×0011| –| | –| –| –
3×0012| VOC [ppb]| Sampling 4 s| Unsigned 16 Bit| 0…60000| 0…60000 ppb
3×0013| VOC [ppb]| Filtering 32 s| Unsigned 16 Bit| 0…60000| 0…60000 ppb

Function 05 Write Single Coil

Function 08 Diagnostics
The following sub function codes are supported

(Reset listen-only mode)

| | Echo telegram
04| Activation listen-only mode| | No answer
10| Delete counter| | Echo telegram
11| Counter bus telegrams| Unsigned 16 Bit| All valid bus telegrams
12| Counter communication errors (Parity, CRC, frame errors, etc.)| Unsigned 16 Bit| Faulty bus telegrams
13| Counter exception telegrams| Unsigned 16 Bit| Error counter
14| Counter slave telegrams| Unsigned 16 Bit| Slave telegrams
15| Counter telegrams without answer| Unsigned 16 Bit| Broadcast messages (address 0)

Function 17 Report Slave ID
Composition of answer telegram

• Terminating resistor may only be installed at the ends of the bus line.
• In networks with repeaters not more than two line terminations are allowed.
• Line termination at the device can be activated via DIP switch 6.
• The bias resistors for bus level definition in the resting state are usually activated at the Modbus master / repeater.
• The maximum number of subscribers per Modbus segment is 32 devices.
• When the number of subscribers is greater, the bus must be subdivided into several segments separated by repeaters. The subscriber address can be set from 1 to 247.
• For the bus line, a twisted-pair cable data line / power supply line and copper mesh wire shield must be used. Therefore, the line capacitance should be less than 100 pF / m (e.g. Profibus cable).

Important notes

• This device may only be used in pollutant-free non-precipitating air without above-atmospheric or below-atmospheric pressure at the sensor element.

• On outdoor and duct sensors, the sinter filter of the senor element protects the humidity sensor against potential dust exposure.
  In case of pollution ⁄ contamination, this filter should be cleaned on a regular basis.

• Dust and pollution falsify measurement results and are to be avoided. Slight pollution and dust sediments can be removed by using compressed air.

• Touching the humidity element is under any circumstances to be avoided, as that would result in considerable mismeasurements.

• In case of pollution, we recommend cleaning and recalibration in the factory.

• In any case, the sensor must not get in contact with chemicals or other cleaning agents.

• Extremely high concentrations of VOCs, aggressive cleaning agents or silicone-containing vapours can destroy the sensor element or reduce its service life drastically.

• The air quality signal “good“…“bad“ is represented by the output signal 0 -10 V or 4…20 mA.

• The device operating range covers 10 … 95 % relative humidity respectively –35…+80 °C.
  Beyond that range, mismeasurements or increased deviations will occur.

• The chemical sensor is a consumable. The lifetime of the sensor depends on nature and concentration of the pollutant gas burden.

• When several sensors are connected to one voltage supply of 24 V AC, correct polarity must be regarded as otherwise the alternating voltage source may be short-circuited.

• The outputs are short-circuit proof. Applying overvoltage or voltage supply to the output will destroy the device.

• If the automatic system (automatic balancing of CO2 / VOC measurand) is activated, a cyclical fresh air supply must be provided,  as otherwise incorrect measurements can occur.

• The device must be permanently energized to measure the CO2 and VOC concentration correctly.

• If this device is operated beyond the specified range, all warranty claims are forfeited.
  Our “General Terms and Conditions for Business“ together with the “General Conditions for the Supply of Products and Services of the Electrical and Electronics Industry“ (ZVEI conditions) including supplementary clause “Extended Retention of Title“ apply as the exclusive terms and conditions.

In additionIn addition, the following points are to be observed:

• These instructions must be read before installation and putting in operation and all notes provided therein are to be regarded!

• Devices must only be connected to safety extra-low voltage and under dead-voltage condition. To avoid damages and errors the device (e.g. by voltage induction) shielded cables are to be used, laying parallel with

• carrying lines is to be avoided, and EMC directives are to be observed.

• This device shall only be used for its intended purpose. Respective safety regulations issued by the VDE, the states, their control authorities,
  the TÜV and the local energy supply company must be observed. The purchaser has to adhere to the building and safety regulations and has to prevent perils of any kind.

• No warranties or liabilities will be assumed for defects and damages arising from improper use of this device.

• Consequential damages caused by a fault in this device are excluded from warranty or liability.

• These devices must be installed and commissioned by authorised specialists.

• The technical data and connecting conditions of the mounting and operating instructions delivered together with the device are exclusively valid. Deviations from the catalogue representation are not explicitly mentioned and are possible in terms of technical progress and continuous improvement of our products.

• In case of any modifications made by the user, all warranty claims are forfeited.

• This device must not be installed close to heat sources (e.g. radiators) or be exposed to their heat flow.
  Direct sun irradiation or heat irradiation by similar sources (powerful lamps, halogen spotlights) must absolutely be avoided.

• Operating this device close to other devices that do not comply with EMC directives may influence functionality.

• This device must not be used for monitoring applications, which serve the purpose of protecting persons against hazards or injury, or as an EMERGENCY STOP switch for systems or machinery, or for any other similar safety-relevant purposes.

• Dimensions of housings or housing accessories may show slight tolerances on the specifications provided in these instructions.

• Modifications of these records are not permitted.

• In case of a complaint, only complete devices returned in original packing will be accepted.

Notes on commissioning
This device was calibrated, adjusted and tested under standardised conditions. When operating under deviating conditions, we recommend performing an initial manual adjustment on-site during commissioning and subsequently at regular intervals.

Commissioning is mandatory and may only be performed by qualified personnel!
These instructions must be read before installation and commissioning and all notes provided therein are to be regarded!

Notes regarding mechanical mounting and attachment
Mounting shall take place while observing all relevant regulations and standards applicable for the place of measurement (e.g. such as welding instructions, etc.). Particularly the following shall be regarded:

• VDE ⁄ VDI directive technical temperature measurements, measurement set-up for temperature measurements.
• The EMC directives must be adhered to.
• It is imperative to avoid parallel laying of current-carrying lines.
• We recommend to use shielded cables with the shielding being attached at one side to the DDC ⁄ PLC.

Before mounting, make sure that the measuring device technical parameters comply with the actual conditions at the place of utilization, in particular in respect of:

• Measuring range
• Permissible maximum pressure, flow velocity, temperature and humidity
• Protection type and Protection class
• Installation length, tube dimensions
• Oscillations, vibrations, shocks are to be avoided (< 0.5 g)

Attention! In any case, please observe the mechanical and thermal load limits of the protective tubes according to DIN 43763 or according to specific S+S standards!

© Copyright by S+S Regeltechnik GmbH
Reprint in full or in parts requires permission from S+S Regeltechnik GmbH.

134r0070/002;1: Frozen :29-Jan-2024

References

• S+S Regeltechnik | Ihr sensorik Partner

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