PROTRONIX NL-ECO-CO2-D Duct Mounted CO2 Sensor User Manual

PROTRONIX NL-ECO-CO2-D Duct Mounted CO2 Sensor

Product Information

The NL-ECO-CO2-D is a duct-mounted CO2 sensor used to monitor air quality inside an air duct. It is designed for effective control of ventilation (HVAC) systems based on the actual air quality. The sensor continuously measures the concentration of carbon dioxide (CO2) in the air. It is suitable for various applications such as offices, classrooms, shopping centers, homes, restaurants, fitness centers, and commercial buildings.

Key Features:

• Measures CO2 concentration using the optical principle of Non-Dispersive Infrared (NDIR) technology.
• LED indication with automatic turn-off at night for easy monitoring.
• Analog voltage output range of 0-10V for CO2 concentration.
• Output relay with Normally Open (NO) and Common (C) contacts for control purposes.
• Easy air duct mounting for convenient installation.
• No maintenance or calibration is required during operation.
• Long-term stability and expected lifetime of more than 10 years.

Product Usage Instructions

Mounting the Sensor:

The NL-ECO-CO2-D sensor should be mounted inside an air duct to monitor the air quality. Ensure proper positioning and secure mounting to achieve accurate readings.

Power Supply:

Connect the sensor to a suitable power supply according to the specified supply voltage range. Make sure to provide a stable power source for continuous operation.

Output Connections:

Use the analog voltage output (0-10V) to interface with your ventilation or control system. Connect the output to the appropriate input of your system for monitoring and control purposes. The output relay can also be utilized for control applications.

CO2 Concentration Monitoring:

The NL-ECO-CO2-D sensor continuously measures the concentration of CO2 in the air. The CO2 concentration is indicated by the LED lights on the sensor.

• White LED lights indicate excellent air quality with CO2 concentration below 600 ppm.
• Green LED lights indicate an optimal balance of air quality and energy consumption with CO2 concentration between 600 and 1200 ppm.
• Yellow LED lights indicate a CO2 concentration above 1200 ppm.

Adjusting Trigger Level:

The trigger level of CO2 concentration for the output relay can be adjusted using the rotary element. Set the desired trigger level within the entire measurement range to suit your specific requirements.

Maintenance and Calibration:

The NL-ECO-CO2-D sensor does not require any maintenance or calibration during operation. It features built-in auto-calibration to compensate for long-term aging of key components, ensuring excellent long-term stability.

Refer to the user manual or visit the manufacturer’s website for further information, technical terms, and abbreviations.

Dimensions: 252x120x80 mm

For more information, visit:

• www.protronix.eu
• www.careforair.eu

Duct sensor NL-ECO-CO2-D is used to monitor air quality inside an air duct and then for effective control of ventilation (HVAC) systems according to actual air quality. The sensor continuously monitors concentration of carbon dioxide (CO2) in air. It can be effectively used to control air quality in offices, classrooms, shopping centers, homes, restaurants, fitness centers, commercial buildings, etc.

• measures CO2, optical principle NDIR
• LED indication with automatic turn off at night
• analog voltage output 0-10V
• output relay NO/C
• easy air duct mounting
• doesn’t need maintenance or calibration during operation
• long-term stability
• expected lifetime >10 years

Description
The measuring of CO2 is based on the principle of infrared radiation attenuation dependence on the CO2 concentration in the air (NDIR).
Built-in auto-calibration function ensures excellent long term stability.
The sensor has one analog output for the actual concentration of CO2.
The concentration of CO2 is a good indicator of the current quality of the indoor air, so the sensor is used for effective control of ventilation and recuperation units.
The trigger level of CO2 concentration output relay can be set by a rotary element over the whole measurement range.
Current air quality can be easily checked by three LED indicators with built- in automatic shut-off at night.

Explanation of abbreviations and technical terms can be found on our website in the Glossary section.

Technical data

CO measuring range 1) 2

| 400 – 2000| ppm
 | 400 – 5000|
CO accuracy 2)

2

–    for ranges 400 – 1000 and 400 – 2000 ppm

–    for range 400 – 5000 ppm

| ****

± 40 ppm + ±4 % of reading

± 60 ppm + ±4 % of reading

CO2 relay – hysteresis| 5 % from range (100ppm/250ppm)
CO2 rate rise| max 1| min
CO2 step response| (90 %) 80| s
Voltage output 3)| 0–10| V DC
Max. switching voltage| 250/30| V AC / V DC
Max. switching current| 5/5| A AC / A DC
Working humidity

non condensing

| 0–95 %| RH
Working temperature| 0 to +50| °C
Storage temperature| -20 to +60| °C
Expected lifetime| 10| years
Ingress protection| IP20|
Dimensions| 252x120x80| mm
1)  Measuring range can be chosen by jumper setting.

2)  At 15–35 °C, 0-80% RH.

3. Minimum achievable output value corresponds to minimum value of the measuring range.

Voltage output versus CO2 concentration for range 400 – 1000 ppm:

Voltage output versus CO2 concentration for range 400 – 2000 ppm:

Voltage output versus CO2 concentration for range 400 – 5000 ppm:

CO2 sensor autocalibration function
Autocalibration compensates for long-term aging of the key components of the sensor. This function is available only during permanent sensor power supply.
Calibration during operation throughout the lifetime of the sensor is not needed.
LED indication description
White LED lights:

• Less than 600 ppm CO2.
• excellent air quality, low concentrations of CO2
• maintaining this level is not cost-effective especially during the winter season

Green LED lights:

• More than or equal to 600 ppm CO2, less than or equal to 1200 ppm CO2.
• optimal balance of air quality and energy consumption for ventilation and air condition
• maintaining the CO2 concentration in this range does not significantly reduce the comfort of the indoor environment

Yellow LED lights:

• More than 1200 ppm CO2.
• higher concentration of CO2 – lower air quality, this can already cause negative effects associated with low air quality such as feeling uncomfortable, restlessness, weakness , fatigue, headache, dizziness etc.

Sensor start after power on
All three LEDs are shining simultaneously in the meantime, pending the availability of the first measured value. But no longer than 10 seconds.
The sensor is fully operational after 1 minute since power on.
The declared accuracy is reached after 4 days of continuous power supply.
Sensor failure indication
All three LED´s lights up at the same time permanently.

Electronic board controls and terminals

Terminals

Terminals

POWER

1. ~ +| supply AC or DC (+) plus pole
2. ~ GND| supply AC or DC (-) minus pole, GND

OUTPUT

3. +| analog output 0-10 V
4. GND| output – minus pole, GND

5. COM| output relay, common contact
6. NO| output relay, normally open contact

Jumpers

Measuring range setting

Factory setting

Setting the relay trigger switching level using rotary selector

The 0 – 100% selector setting corresponds to the value of selected CO2 measuring range – see example below.

The relay switches on when the level measured value rises above the level of the rotary selector.
The relay switches off when the level measured value falls below the level of the rotary selector minus hysteresis value of 5% from measuring range.
Minimal lag between changes in state relays are 2 minutes.

Selector value| CO2 (1000pm)| CO2 (2000pm)| CO2 (5000pm)
---|---|---|---
0 %| 0| 0| 0
10 %| 100| 200| 500
20 %| 200| 400| 1000
30 %| 300| 600| 1500
40 %| 400| 800| 2000
50 %| 500| 1000| 2500
60 %| 600| 1200| 3000
70 %| 700| 1400| 3500
80 %| 800| 1600| 4000
90 %| 900| 1800| 4500
100 %| 1000| 2000| 5000

Relay switching example – selected measuring range 2000ppm, hysteresis 5% = 100ppm, selected switching level value 50% (50% correspond to 1000ppm CO2)

Sensor connection using the output relay

Sensor connection – direct EC motor control using signal 0-10 V

you connect other devices or more sensors to the same AC power source as the NL sensor, it is necessary to meet GND wiring of all analog inputs and outputs, as well as power wires.

Dimensions

Installation

Way to use
The product is intended for indoor use only.
What to do at the end of lifetime of this product
Discard the product in according to the electronic waste law and the EU directives. producer reserves the right of technical changes in order to product improvements its properties and functions without previous notice. Protronix s.r.o., Pardubická 177, Chrudim 537 01, Czech Republic www.protronix.eu. www.careforair.eu.

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