PROTRONIX NLII-CO2+T Combined CO2/T Sensor 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
Dimensions
Sensor assembly
Box color
Way to use
End of product life
Support
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PROTRONIX NLII-CO2+T Combined CO2/T Sensor User Manual

Combined sensor NLII-CO2+T 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 concentrationof carbon dioxide (CO2) and temperature (T). It is suitable for offices, classrooms, shopping centers, homes, restaurants, fitness centers, commercial buildings, etc.

measures CO2 and T
2x analog voltage/current output
maintenance during operation is not required
long life and stability

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.

The sensor has built-in two separate analog outputs – one for the actual concentration of CO2 and the other for actual temperature.

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

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 – 2000	ppm
CO2 accuracy	± 35 ppm ±5 % of reading
CO2 rate rise	max 1	min
CO2 step response	(90 %) 80	s
T measuring range	0 – 50	°C
T accuracy	± 0,4	°C
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	90x80x31	mm

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

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 T
Typical T measurement accuracy

LED indication description

White LED lights:

Less than 600 ppm CO2 or less than 18 °C. (according to the quantity selected for indication)

maintaining low concentrations of CO2 is not cost-effective – slightly increased concentration does not cause any health complications
Low temperature and its higher fluctuation is not economically profitable

Green LED lights:

More than or equal to 600 ppm CO2 or 18 °C and less than or equal to 1200 ppm CO2 or 22 °C. (according to the quantity selected for indication)

optimal balance of air quality and energy efficiency of ventilation and air conditioning
optimal air temperature in terms of thermal contentment, health and energy demand

Yellow LED lights:

More than 1200 ppm CO2 or more than 22 °C. (according to the quantity selected for indication)

higher concentration of CO2 – further increase of CO2 concentrations above this level can cause fatigue, restlessness, headache
higher temperature T – high temperature can cause fatigue, restlessness, headache and feeling hot

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: T sensor analog output, 0-10 V or 0-20 mA or 4-20 mA
GND: T sensor output GND

Jumpers

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

Jumpers on the electronics board

Mark	Description	Settings	Meaning
JP1	Current output offset T

shift quiescent current from 0 mA to 4 mA

| | current output T 0-20 mA

| current output T 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 T
select the type of analog output
if voltage output T is selected, JP2 must not be shorted| | ****

voltage output T

| current output T
JP6 – 1 JP6 – 3| Enabling LED indication
Selecting the sensor for LED indication – CO 2 or T.| | LED indikace podle CO2
| LED indication according to ambient light when ambient light is dimmed (at night), LED indicators turn off automatically.| LED indikace dle okolního osvětlení
|
| | LED indikace podle T
| | LED indikace trvale zapnuta
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
T analog output: voltage output

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.

Connection