PROTRONIX NLII-CO2+RH+T-5-SX Combined CO2/RH/T Sensor with Sigfox User Manual

: June 6, 2024
: PROTRONIX

Table of Contents

Description
Technical data
CO2 sensor autocalibration function
LED indication description
Electronic board controls and terminals
Jumpers on the electronics board
Factory settings
Sensor assembly
Disassembly
Dimensions
Box color
Way to use
End of product life
Customer Support
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PROTRONIX NLII-CO2+RH+T-5-SX Combined CO2/RH/T Sensor with Sigfox User Manual

Room sensor NLII-CO2 is used to continuously monitor air quality inside buildings and then control ventilation (HVAC) systems according to current levels of air internal air quality. The sensor measures concentration of carbon dioxide (CO2), relative humidity (RH) and temperature (T). It can be effectively used in offices, classrooms, shopping centers, homes, restaurants, fitness centers, commercial buildings, etc.

measures CO2, RH and temperature
2x analog voltage/current output
SIGFOX wireless communication
maintenance during operation is not required

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 autocalibration function ensures very good long term stability.

Measurement of the relative humidity is based on the principle of capacitive polymer sensor.
The sensor has built-in two separate analog outputs – one for the actual concentration of CO2 and the other for the current relative humidity. Temperature output is available by Sigfox communication.

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.

For detailed information on the communication protocol, use the document NLII-SigfoxCommunication.

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 startup	max 1	min
CO2 step response	(90 %) 80	s
RH measuring range	0 – 100 %	RH
RH accuracy 20 – 80 %	± 3 %	RH
RH accuracy 0 – 100 %	± 6 %	RH
T measuring range	0 – 50	°C
T accuracy	± 0,4	°C
Output 1)	0-10 V / 0-20 mA / 4-20 mA

Working humidity

non condensing

| 0 – 95 %| RH
Working temperature| 0 to +50| °C
Storage temperature| -20 to +60| °C
Expected lifetime| min. 10| years
Ingress protection| IP20|
Dimensions| 110x158x31| mm
It is possible to select the desired type of analog output by a jumper. Minimum achievable output value corresponds to minimum value of the measuring range.

CO2 sensor autocalibration function

Autocalibration compensates for long-term aging of the key components of the sensor. This function is available only when sensor power supply is continuous and uninterrupted. Calibration during operation is not necessary

Selected analog output values versus actual CO2 concentration
Selected analog output values versus actual RH
Typical RH measurement accuracy at 25 °C
Typical T measurement accuracy

LED indication description

White LED lights:

Less than 600 ppm CO2 or less than 40 % RH. (according to the quantity selected for indication)

maintaining low concentrations of CO2 is not cost-effective – slightly increased concentration does not cause any health complication
low concentrations of RH. Too dry air feels cooler as compared to equally hot but more humid air – risk of drying of the mucous membranes – respiratory problems

Green LED lights:

More than or equal to 600 ppm CO2 or 40 % RH, less than or equal to 1200 ppm CO2 or 60 % RH. (according to the quantity selected for indication)

optimal balance of air quality and energy efficiency of ventilation and air conditioning
optimal relative humidity for humans

Yellow LED lights:

More than 1200 ppm CO2 or more than 60 % RH. (according to the quantity selected for indication)

higher concentration of CO2 – further increase of CO2 concentrations above this level can cause fatigue, restlessness, headache
too high humidity – the risk of mold growth and associated health complications

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 severe mechanical shock of the sensor.

Electronic board controls and terminals

Terminals

~ + supply AC or DC (+) plus pole
~ GND supply AC or DC (-) minus pole, GND
OUT1 CO2 sensor analog output, 0-10 V or 0-20 mA or 4-20 mA
GND CO2 sensor output GND
OUT2 RH sensor analog output, 0-10 V or 0-20 mA or 4-20 mA
GND RH sensor output GND

Jumpers

JP1 – Current output offset RH
JP2 – Current output offset CO2
JP3 – Voltage/current output CO2
JP4 – Voltage/current output RH
JP6 – LED indication settings

Jumpers on the electronics board

Mark	Description	Settings	Meaning
JP1	Current output offset RH

shift quiescent current from 0 mA to 4 mA

| | current output RH 0-20 mA
| current output RH 4-20 mA
JP2| Current output offset CO 2

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 CO 2

select the type of analog output
if the selected voltage output is CO2, JP2 must not be shorted

| | voltage output CO2

| ****

current output CO2

JP4| Voltage/current output RH

select the type of analog output
if the selected voltage output is RH, JP1 must not be shorted

| | voltage output RH
| ****

current output RH

JP6 – 1| LED indication

LED indication according to ambient light
when ambient light is dimmed (at night), LED indicators turn offautomatically.

| | permanent LED indication enabled
| LED indication according to ambient light
JP6 – 4 JP6 – 5| These positions are not intended for user setting.| |

Factory settings

LED indication: by CO2, indication turns off when ambient light dims
CO2 analog output: voltage output
RH analog output: voltage output

Example of CO2 sensor connection for direct EC motor control using 0-10 V signal

CO2 sensor connection

If you connect other devices 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.

Sensor assembly

Disassembly

When disassembling, be careful not to rip-out the antenna cable. It connects the antenna in lower part of the sensor with the electronics in the upper part.