Viconox

Combined No₂, NO, CO and visibility monitors for tunnels

The VICONOX tunnel atmosphere monitor is a single sensor solution for measuring toxic gases, visibility and temperature within harsh tunnel environments.

Viconox

The VICONOX tunnel atmosphere monitor is a single sensor solution for measuring NO₂, NO, (NOx), CO, visibility and temperature (or combinations of) within a road traffic tunnel, rail tunnel or other confined space. These measurements can be used as part of an air quality management system for ventilation control and / or secondary smoke detection.

The VICONOX has been designed for harsh tunnel environments with a high quality, IP67 rated stainless steel enclosure. Wall mounted alignment bracketry, quick release heads and quick lock cable connections make installation and future servicing easy and simple. The VICONOX’s intelligent heads have RS485 (Modbus RTU), Digital Relays and Analogue Outputs as standard for connection to a PLC / SCADA system.

Features

Direct in-situ measurement of NO₂, NO, (NOx), CO, Visibility and Temperature (or combinations thereof)
Direct optical measurement of nitrogen dioxide (NO₂) using differential absorption
Visibility measurement using an accepted light transmission opacity technique
Proven infrared spectroscopy technique for NO and CO measurement
Quick lock plug and socket cable connection enabling simple installation
RS485 communication (Modbus RTU), Digital Relays and Analogue outputs
Optional extended warranty and 5 year refurbishment programs are available

Benefits

Pre-aligned quick release TX and RX heads enabling easy installation and maintenance
Up to 6 measurement parameters in one unit minimises capital cost but also minimises the requirements for cabling, installation and commissioning
Temperature and humidity compensated measurements to ensure stable readings across all conditions
Rugged design to withstand corrosive atmospheres and regular tunnel washing
High quality 316 stainless steel construction ensuring a long service life
IP67 rated external enclosure with quick release dust protection tubes

Specification

NO₂ Measurement Performance

No.	Parameter	Units	Min	Max	Comment
1	Path Length	m	5	12	Optimum 10m
2	Measuring Range	ppm (ppb)	0	10	User selectable (Option)
3	Resolution	ppm		0.01	Display resolution
4	Accuracy (at 10m path length)	PPM %	-0.05 -5	+0.05 +5	(Detection Limit) Of Reading
5	Damping	s	1	999	Default setting is 20s

Visibility Measurement Performance

No.	Parameter	Units	Min	Max	Comment
6	Measurement Range Extinction Coefficient (k) Meteorological Optical Range (MOR) Opacity Particulate Density (Dust)	km-1 m % mg/m3	0 0 0 0	15 15000 100 100	User selectable With density scale factor =1.0
7	Resolution Extinction Coefficient (k) Meteorological Optical Range (MOR) Opacity Particulate Density (Dust)	km-1 m % mg/m3		0.1 1 0.1 0.1	Display Resolution
8	Accuracy Extinction Coefficient (k)	km-1	-0.2	+0.2	At 10m path length
9	Damping	s	1	999	Default setting is 3s

CO/NO (NOx) Measurement Performance

No.	Parameter	Units	Min	Max	Comment
10	Measurement Range CO Measurement Range NO	ppm ppm	0 0	300 100	User Selectable
11	Resolution	ppm		0.1	Display Resolution
12	Accuracy (Detection Limit) CO NO	ppm ppm		1 2
13	Accuracy (Detection Limit) CO NO	% %	-2 -5	+2 +5	Of Reading (Instrument calibrated in-situ)
14	Damping CO Damping NO	s s		40 100

Temperature Measurement Performance

No.	Parameter	Units	Min	Max	Comment
15	Display Range	°C	-40	+100	User Selectable
16	Resolution	°C		0.1	Display Resolution
17	Accuracy	°C	-2	+2

Power

No.	Parameter	Units	Min	Max	Comment
18	Voltage	Vdc			+24
19	Voltage Tolerance	%	-10	+10
20	Nominal Current Consumption	A		2
21	Power UP Current Consumption	A		3

Interface Options

No.	Parameter	Units	Min	Max	Comment
22	Serial outputs				Modbus RTU via RS485 External USB (RX)
23	Analogue Outputs (four)	mA	0 / 2 / 4	20	Isolated and scalable (user selected)
24	Digital Relay Contacts (five)	A	0	3	@30Vdc (signal levels and data valid)

Physical

No.	Parameter	Units	Min	Max	Comment
25	Ingress Protection			IP67
26	Operating Temperature	°C	-20	+55
27	Operating Humidity	%		100
28	Materials				AISI/SAE 316L Stainless steel
29	Dimensions	mm			180 x 210 x 200 (each head without sight tubes)
30	Weight	kg		5.3	Each head

Compliance & Design

No.	Parameter	Units	Min	Comment
31	Regulatory Compliance			2014/30/EU (Electromagnetic Radiation) 2014/35/EU (Low Voltage)
32	Design Life	Years	20
33	MTBF	Years	>20
34	Warranty	Months	24	Return to base warranty. Extensions available

Ask a question

For further information on any of our products, please complete our contact form and a member of staff will respond as soon as possible.

Altenatively call us on +44 (0)1280 850521

SATISFIED CLIENTS

Don’t just take our word for it, read what some of our clients are saying about our tunnel sensors.

“We think of tunnel sensors as one of our most reliable and valuable partners that can provide equipment and technical expertise of highest quality.”

View our other Tunnel Sensors

Below are our flagship tunnel sensor products, simply select them for more information

Viconox

The VICONOX provides a total monitoring solution for the measurement of NO2, NO, CO, visibility and temperature within traffic tunnels.

LEARN MORE

Airflow MkII

The AIRFLOW MkII is a robust, single point monitor designed to measure air velocity (and temperature when specified) within a tunnel environment.

LEARN MORE

Crossflow

The CROSSFLOW provides an open path cross bore solution for measuring air velocity and direction in a tunnel.

LEARN MORE

Viconox

Combined No₂, NO, CO and visibility monitors for tunnels

Viconox

Features

Benefits

Specification

Download brochures

Ask a question

SATISFIED CLIENTS

View our other Tunnel Sensors

Viconox

Viconox

Airflow MkII

Airflow MkII

Crossflow

Crossflow

Products

Contact us

Quotations

Brochures

Follow us

Viconox

Combined No2, NO, CO and visibility monitors for tunnels

Viconox

Ask a question

SATISFIED CLIENTS

View our other Tunnel Sensors​

Viconox

Viconox

Airflow MkII

Airflow MkII

Crossflow

Crossflow

Products

Contact us

Quotations

Brochures

Follow us

Combined No₂, NO, CO and visibility monitors for tunnels

View our other Tunnel Sensors