SENSE & EASY
User manual
NLII-CO2-R-5-A | Room sensor CO2 with sound alarm
Room sensor NLII-CO2 is used to continuously monitor air quality inside buildings and then control ventilation (HVAC) systems according to current levels of internal air quality. The sensor measures the concentration of carbon dioxide (CO2) in the air. It is suitable for schools, offices, classrooms, shopping centers, homes, restaurants, fitness centers, commercial buildings, etc.
measures CO2
analog voltage/current output
2x output relay – 2x NO/C
sound signalization – alarm
two modes of relay switching
maintenance during operation not required
long life and stability
|
Type of sensor / Order code |
CO2 output |
Relay |
| NLII-CO2-R-5-A | 0-10 V/0-20 mA/4-20 mA1) | 1x NO/C |
| NLII-CO2-2R-5-A | 0-10 V/0-20 mA/4-20 mA1) | 2x NO/C |
1) It is possible to select the desired type of analog output by a jumper on the electronics board. The minimum achievable output value corresponds to the minimum value of the measuring range.
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 very good long-term stability.
The sensor has built-in one analog output for the actual concentration of CO2. The relay trigger level can be set by the SETPOINT rotary switch.
Relay switching is indicated simultaneously with a short (1,5s) audible signal and yellow LED light.
The way of relay switching can be set by a jumper – 5s pulses when the CO2 concentration exceeds and falls below the set CO2 level for e.g. opening and closing a skylight, or standard switching, where relays are closed until the measured CO2 concentration drops under the set CO2 level.
So the sensor efficiently manages ventilation and heat recovery units, based on current room air quality.
The current air quality can easily be determined by looking at the three LED indicators. The eco level means good indoor air quality necessary to achieve a sense of well-being and at the same time optimal energy costs for heating, ventilation, or air conditioning.
Explanation of abbreviations and technical terms can be found on our website in the Glossary section.
Technical data
| Parameter | Value |
Unit |
| Supply voltage range | 12 – 35
12 – 24 |
V DC
V AC |
| Average consumption | 0,5 | W |
| CO2 measuring range | 400 – 5000 | ppm |
| CO2 accuracy | ± 35 ppm ±5 % of reading | |
| CO2 relay – hysteresis | 100 | ppm |
| CO2 rate rise | max 1 | min |
| CO2 step response | (90 %) 80 | s |
| Max. switching voltage | 250/30 | V AC / V DC |
| Max. switching current | 5/5 | A AC / A DC |
| Working humidity no condensing | 5 – 95 % | RH |
| Working temperature | 0 to +50 | °C |
| Storage temperature | -20 to +60 | °C |
| Expected lifetime | min. 10 | years |
| Ingress protection | IP20 | |
| Dimensions | 90x80x31 | mm |
CO2 sensor autocalibration function
Autocalibration compensates for the long-term aging of the key components of the sensor. This function is available only when the sensor power supply is continuous and uninterrupted. Calibration during operation is not necessary.
Selected analog output values versus CO2 concentration
LED indication description
White LED lights:
Less than 600 ppm CO2.
– maintaining low concentrations of CO2 is not cost-effective – slightly increased concentration does not cause any health complications
Green LED lights:
More than or equal to 600 ppm CO2, less than or equal to 1200 ppm CO2.
– the optimal balance of air quality and energy efficiency of ventilation and air conditioning
Yellow LED lights + sound alarm:
When the measured CO2 concentration exceeds the level set by the SETPOINT rotary switch.
– yellow LED lights always when the measured CO2 concentration exceeds the level set by SETPOINT rotary switch (min 1000ppm), simultaneously the sound alarm is triggered and the relay contacts close. The sensor remains in this state for 2 minutes – see relay switching graph below.
– CO2 concentration higher than 1200 ppm can cause fatigue, restlessness, headache and feel uncomfortable, hotness, etc.
Sensor start after power on
All three LEDs flash simultaneously until the first readings are available, but no longer than 10 seconds.
Sensor failure indication
All three LEDs are shining permanently.
CAUTION:
Warm-up: operational after 1 minute since power on. The declared accuracy is reached after 4 days of continuous power supply.
It is necessary to avoid the severe mechanical shock of the sensor.
Electronic board controls and terminals
| Terminals 1. ~ + power AC or DC (+) plus pole 2. ~ GND power AC or DC (-) minus pole, GND 3. OUT1 CO2 sensor analog output, 0-10 V or 0-20 mA or 4-20 mA 4. GND CO2 sensor output GND 5. OUT2 unused 6. GND unused 7. OUT3 NO relay 2 output, normally open (RH) 8. OUT4 C output relay, common contact 9. OUT5 NO relay 1 output, normally open (CO2) |
SETPOINT rotary switch for setting the relays switching level RELAY 1 – switching level for CO2 setting Jumpers JP1 – unused JP2 – Current output offset CO2 JP3 – Voltage/current output CO2 JP4 – unused JP6 – LED indication and switching mode settings |
Jumpers on the electronics board
|
Mark |
Description | Settings |
Meaning |
| JP2 | Current output offset CO2 – shift quiescent current from 0 mA to 4 mA |
 |
current output CO2 0-20 mA |
 |
current output CO2 4-20 mA | ||
| JP3 | Voltage/current output CO2 – select the type of analog output – if the selected voltage output is CO2, JP2 must not be shorted |
 |
voltage output CO2 |
 |
current output CO2 | ||
| JP6 – 1 JP6 – 2 JP6 – 3 |
Switching mode, signalization, and alarm – LED indication according to ambient light – when ambient light is dimmed (at night), LED indicators to turn off automatically. |
 |
relays contacts closed until concentration drops sound alarm disabled LED indication according to ambient light |
 |
relays switching in 5s pulses sound alarmed enabled permanent LED indication enabled |
||
| JP6 – 4 JP6 – 5 |
These positions are not intended for user settings. |  |
Setting the relay switching mode using jumper JP6-3 and SETPOINT rotary switch
If the jumper JP6-3 is closed, relay 1 contacts close for 5s always, when the measured concentration of CO2 rises above the level set by the SETPOINT rotary switch.
When the measured concentration of CO2 drops below the level set by the SETPOINT switch minus the hysteresis value of 100 ppm, relay 2 contacts close for 5s.
If the jumper JP6-3 is open, both relays contact close, when the measured concentration of CO2 rises above the level set by the SETPOINT rotary switch and stay close until the measured concentration drops below the level set by SETPOINT switch minus the hysteresis value of 100 ppm.
The minimum delay between changes of relays state is 2 minutes.
Relay switching graph with 1 relay (NLII-CO2-R-5-A)
Relay switching graph with 2 relays (NLII-CO2-2R-5-A)
Setting the switching levels
The required concentration of CO2
| SETPOINT |
CO2 [ppm] |
| 0 | 1000 |
| 1 | 1100 |
| 2 | 1200 |
| 3 | 1300 |
| 4 | 1400 |
| 5 | 1500 |
| 6 | 1600 |
| 7 | 1700 |
| 8 | 1800 |
| 9 | 1900 |
| A | 2000 |
| B | 2100 |
| C | 2200 |
| D | 2300 |
| E | 2400 |
| F | 2500 |
Example for setting the concentration of 1500 ppm
If you connect other devices to the same AC power source as the NL sensor, it is necessary to meet the GND wiring of all analog inputs and outputs, as well as power wires.
Dimensions
Sensor assembly
Box color
Front: white – RAL9016
Base: gray – RAL7035
Way to use
The product is intended for indoor use only. You can read the recommendations for sensor placement on our web pages.
End of product life
Discard the product according to the electronic waste law and the EU directives.
The producer reserves the right of technical changes in order to produce improvements in its properties and functions without previous notice.
Protronix s.r.o., Pardubická 177, Chrudim 537 01, Czech Republic
www.protronix.cz/en/
www.careforair.eu/en/
Documents / Resources
 |
PROTRONIX NLII-CO2-R-5-A Room Sensor CO2 with Sound Alarm [pdf] User Manual NLII-CO2-R-5-A, Room Sensor CO2 with Sound Alarm |
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PROTRONIX NLII-CO2-R-5-A Room Sensor CO2 With Sound Alarm [pdf] User Manual NLII-CO2-R-5-A Room Sensor CO2 With Sound Alarm, NLII-CO2-R-5-A, Room Sensor CO2 With Sound Alarm, CO2 With Sound Alarm, Sound Alarm, Alarm |
