PROTRONIX NLII-iVOC Combined VOC/RH Sensor User Manual

: June 6, 2024
: PROTRONIX

Table of Contents

Description
Technical data
Sensor assembly
Dimensions
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User manual

NLII-iVOC | Combined VOC/RH sensor

PROTRONIX NLII iVOC Combined VOC RH Sensor

Room sensor NLII-iVOC is used to continuously monitor air quality inside buildings and then control ventilation (HVAC) systems according to current levels of air pollution. The sensor measures the concentration of gaseous organic substances in the air (VOC) and relative humidity (RH) of air. The sensor can be effectively used in offices, classrooms, restaurants, kitchens, fitness centers, commercial facilities, etc.

measures VOC and RH
close to the human perception of odors
compatibility with CO2 standard
2x analog voltage/current output
2x output relay – 2x NO/C
option for cascade relay switching

Type of sensor/order code	iVOC output	RH output	Relay
NLII-IVOC	0-10 V/0-20 mA/4-20 mA1)	–	–
NLII-IVOC-R	0-10 V/0-20 mA/4-20 mA1)	–	1x NO/C/NC
NLII-IVOC+RH	0-10 V/0-20 mA/4-20 mA1)	0-10 V/0-20 mA/4-20 mA1)	–
NLII-IVOC+RH-R	0-10 V/0-20 mA/4-20 mA1)	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. The minimum achievable output value corresponds to the minimum value of the measuring range.

Description

Built-in advanced iVOC sensor is sensitive to volatile organic substances typically contained in the stuffy air-gaseous products of human metabolism and other gaseous pollutants such as formaldehyde, cooking vapors, fumes from paints, varnishes, adhesives, detergents, etc. that CO2 sensor does not detect. NLiVOC sensor detects those gaseous pollutant substances in the air that are the main reason for ventilation. Sensor NL-iVOC approximates to human perception of air quality. The output of the sensor is calibrated as equivalent to a standard CO2 sensor with a range of 450 – 2000ppm.
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 VOC and the other for the current relative humidity.
If the sensor contains 2 relays, it can be set to two switching modes: standard (each relay switches according to its assigned quantity), a cascade mode (both relays switch according to one selected quantity and each one can be set to a different switching level).
Cascade switching, for example, can be used for two-step switching of ventilation units’ output power. Relay trigger levels can be set independently by two rotary elements.
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
iVOC measuring range 1)| 450 – 2000| ppm
iVOC relay – hysteresis| 100| ppm
RH measuring range| 0 – 100 %| RH
RH accuracy 20 – 80 %| ± 3 %| RH
RH accuracy 0 – 100 %| ± 6 %| RH
RH switching hysteresis| 5 %| RH
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 +50| °C
Expected lifetime| min. 10| years
Ingress protection| IP20|
Dimensions| 90x80x31| mm
1) iVOC ppm equivalent to CO2 ppm

iVOC sensor autocalibration function
Autocalibration compensates for the 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 VOC concentration

Selected analog output values versus actual RH

Typical RH measurement accuracy at 25 °C

PROTRONIX NLII iVOC Combined VOC RH Sensor - Typical RH measurement accuracy
at 25 °C

LED indication description

White LED lights:
Less than 600 ppm VOC or less than 40 % RH. (according to the quantity selected for indication)
– maintaining low concentrations of VOC is not cost-effective – slightly increased concentration does not cause any health complications
– low concentrations of RH. Too dry air feels cooler as compared to equally hot but more humid air – the risk of drying of the mucous membranes – respiratory problems

Green LED lights:
More than or equal to 600 ppm VOC or 40 % RH, less than or equal to 1200 ppm VOC or 60 % RH. (according to the quantity selected for indication)
– the 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 VOC or more than 60 % RH. (according to the quantity selected for indication)
– higher concentration of VOC – a further increase of VOC 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
For 6 minutes after power on the sensor will warm up. This state is indicated by simultaneous flashing of all three LEDs. The LEDs will show the condition of air according to the LED indication description after the warm-up is done.
Sensor failure indication
All three LEDs are shining permanently.
CAUTION:
Warm-up: operational after 6 minutes 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 VOC sensor analog output, 0-10 V or 0-20 mA or 4-20 mA
4. GND VOC sensor output GND
5. OUT2 RH sensor analog output, 0-10 V or 0-20 mA or 4-20 mA
6. GND RH sensor output GND
7. OUT3 NO relay 2 output, normally open (RH) (for NLII-iVOC-R it is an NC contact)
8. OUT4 C output relay, common contact
9. OUT5 NO relay 1 output, normally open (VOC)| SETPOINT rotary switches for setting the relays switching levels
RELAY 1 – level control switching for VOC
RELAY 2 – level control switching for RH
Jumpers
JP1 – Current output offset RH
JP2 – Current output offset VOC
JP3 – Voltage/current output VOC
JP4 – Voltage/current output RH
JP6 – LED indication and switching mode 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 VOC
– shift quiescent current from 0 mA to 4 mA| | current output VOC 0-20 mA
| current output VOC 4-20 mA
JP3| Voltage/current output VOC
– select the type of analog output
– if the selected voltage output is VOC, JP2 must not be shorted| | voltage output VOC
**| current output VOC
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 to turn off automatically.| | permanent LED indication enabled
| LED indication according to ambient light
JP6 – 2
JP6 – 3| – Selecting the sensor for switching and LED indication – VOC or RH.
– if standard switching is selected, VOC and RH sensor control their own relay
– if cascade switching is selected, the one chosen sensor controls both relays according to the levels set by the SETPOINT rotary switches (for both switches the according to switching levels table – VOC or RH, is applied)| | switching and LED indication by VOC standard mode switching
| switching and LED indication by RH standard mode switching
| switching and LED indication by VOC cascade mode switching
| switching and LED indication by RH cascade mode switching
JP6 – 4
JP6 – 5| These positions are not intended for user settings.| ****|

Setting the relay switching using rotary switch SETPOINT
The relay switches on when the measured variable level rises above the level of the rotary switch SETPOINT.
The relay switches off when the measured variable level falls below the level of the rotary switch SETPOINT minus hysteresis value of 100 ppm.
The minimal delay between changes in relays state is 2 minutes.

Standard switching with one relay (NLII-iVOC-R)

Standard switching with two relays by VOC (NLII-iVOC+RH-R)

Standard switching with two relays by RH (NLII-iVOC+RH-R)

Cascade switching with two relays by VOC (NLII-iVOC+RH-R)

Setting the switching levels

The required concentration of VOC

SETPOINT	VOC [ppm]
0	500
1	600
2	700
3	800
4	900
5	1000
6	1100
7	1200
8	1300
9	1400
A	1500
B	1600
C	1700
D	1800
E	1900
F	2000

Example for setting the concentration of 1000 ppm VOC:

Required relative humidity (RH)

SETPOINT	RH [%]
0	relay off
1	10
2	20
3	30
4	40
5	50
6	60
7	70
8	80
9	90
A	35
B	45
C	55
D	65
E	75
F	85

Example for setting a relative humidity of 55%:

Factory settings

LED indication:	by VOC, indication turns off when ambient light dims
VOC analog output:	voltage output
RH analog output:	voltage output
Relay switching mode:	Standard
Switching level VOC:	1000 ppm
Switching level RH:	55%

Example of VOC sensor connection with one relay (1x switching contact)

Example of VOC sensor connection with two relays (2x NO/C)

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

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.