PROTRONIX NLII-CO2-R-5-A Room Sensor CO2 with Sound Alarm User Manual
- June 6, 2024
- PROTRONIX
Table of Contents
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
| CO 2 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
- 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 CO 2
– shift quiescent current from 0 mA to 4 mA| | current output CO 2 0-20
mA
| current output CO 2 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 CO 2
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|
CO 2 [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/