Monitoring of air quality – visibility and gases

Visibility and gas monitoring during normal operation is used to control the tunnel ventilation at normal operation. If and with how much power artificial ventilation by jet fans is operated depends on the measured visibility and gas concentration.

Visibility is expressed by the extinc-tion coefficient, which describes the light attenuation caused by particles in the air.

The sensor extracts air from the tunnel by an integrated fan and feeds it into the measuring cell which detects the intensity of light scattered by this sample, sets it into relation with the light passing through and calculates the extinction coefficient.

Optional electrochemical gas sensor cells induce currents proportional to the prevailing gas concentration. With these currents and the measured temperature, the gas sensor modules calculate the gas concentrations.

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smart/AQM Air Quality Monitor

Features

Smart IoT enables visibility and gas sensor
Scattered lightvisibility sensor
Dual beam method to compensate soiling and ageing
Optional up to 3 electrochemical gas sensor modules
Pre-calibrated gas sensor modules for different gases and measuring ranges, including CO, NO, NO₂, SO2
Installation in-situ in the tunnel’s driving area or extractive with hose adapters
Active extraction of sample air by integrated fan
Integrated purge air system
Optional sample heater to eliminate fog from measurement
Stainless steel housing 1.4404 (AISI 316L)
Sensor protected against splashing of water and powerful water jets used for tunnel washing
IP rating IP69K
Optional LCD in housing cover
Integrated web server for visualisation, configuration, data logging, remote maintenance
Connection to tunnel control system by
- MODBUS/TCP (Ethernet)
- MODBUS RTU (RS-485)
- Analogue and relay outputs (optional)
- OPC UA (Ethernet)
Optional smart/HUB IoT operating and control unit with touch display

System

Advantages

Specifically designed for application in tunnels
Single sensor instead of transmitter/receiver pair requiring exact alignment
Effective fog eliminationby optional heater
Easy recalibration by calibration plug
Internal purge air system keeps optics clean and prevents long-term drift
Robust stainless steel housing for protection against corrosion and water jets
Permanent condition monitoring
Remote maintenance
Low maintenance requirements, stable, accurate
Pre-calibrated gas sensor modules for easy exchange
Flexible integration into tunnel control system
Ethernet port
Mounting height in accordance with Austrian RVS
Menu guided recalibration of gas sensor modules
Smart IoT solution from sensor over hub to asset management software

Technical Specifications

Sensor smart/AQM (Basic variant)
Type	JES smart/AQM-VIS
Measuring method	Dual beam scattered light
Measured value	Scattered light intensity expressed as extinction coefficient, transmission, etc.
Measuring range	Configurable typically 0 .. 15 / km (according draft of EN 50545-2)
Resolution	0.001 / km
Accuracy	0.01 / km
Power supply	24 VDC ± 10 %
Current consumption	max. 800 mA (without heater) @ 24 VDC max. 2 A @ 24 VDC (with heater)
Appliance class	Class III (PELV)
Material	Stainless steel 1.4404 (AISI 316L)
IP rating	IP 69K
Dimensions	300 x 220 x 100 mm
Weight	approx. 5.8 kg
Analogue/relay outputs (standard)	3 x 4 – 20 mA (2-wire, active) 3 x SPDT
Temperature range	-40 .. +60 °C
Pressure range	640 .. 1060 hPa
Humidity range	0 .. 100% relative humidity (non-condensing)
Storage temperature	-40 .. +85 °C (without gas sensor modules)

Sensor smart/AQM (Standard und Smart Variante)
Type	JES smart/AQM
Gas sensor ports	up to 3 (specify at order)
Measuring method	Visibility: Dual beam scattered light Gas: electrochemical gas sensor cells
Measured values	Visibility: Scattered light intensity expressed as extinction coefficient, transmission, etc. Gas: Concentration
Measuring range	Visibility: Configurable, typically 0 .. 15 / km (according draft of EN 50545-2) Gas: depending on installed gas sensor modules
Resolution	Visibility: 0.001 / km Gas: depending on installed gas sensor modules
Accuracy	Visibility: 0.01 / km Gas: depending on installed gas sensor modules
Power supply	24 VDC ± 10 %
Current consumption	max. 1,1 A @ 24 VDC (without heater) max. 2,3 A @ 24 VDC (with heater)
Appliance class	Class III (PELV)
Material	Stainless steel 1.4404 (AISI 316L)
IP rating	IP 69K
Dimensions	300 x 220 x 100 mm
Weight	approx. 6.2 kg
Digital interfaces (standard)	MODBUS RTU (RS-485) MODBUS/TCP (Ethernet) Webserver for configuration (Ethernet)
Analogue/relay outputs (standard)	3 x 4 – 20 mA (2 wire, active) 3 x SPDT
Additional analogue/relay outputs (optional)	up to 2 analogue / relay output modules, each: 3 x 4 – 20 mA (2 wire, active) 3 x relay
Temperature range	-40 .. +60 °C
Pressure range	640 .. 1060 hPa (visbility only) 900 .. 1060 hPa (with gas sensor modules)
Humidity range	0 .. 100% relative humidity, non-condensing (visbility only) 15 .. 95% relative humidity, non-condensing (with gas sensor modules)
Storage temperature	-40 .. +85 °C (without gas sensor modules)

Terminal box smart/AQM-TBX
Type	JES smart/AQM-TBX
Power supply	90 .. 264 VAC, 48 .. 62 Hz
Power consumption	60 W
Appliance class	Class I
Material	Stainless steel 1.4404 (AISI 316L)
IP rating	IP 69K
Dimensions	250 x 160 x 110 mm
Weight	approx. 3.2 kg
Temperature range	-40 .. +60 °C
Humidity range	0 .. 100% relative humidity (non-condensing)
Storage temperature	-40 .. +85 °C (without gas sensor modules)

Gas sensor module CO-500
Type	JES smart/ECS-CO-500
Measuring method	Electrochemical cell
Measured value	Gas concentration in ppm
Measuring range	Configurable within 0 .. 500 ppmCO typically 0 .. 300 ppmCO (according draft of EN 50545-2)
Maximum overload	1,000 ppm CO
Lower detectable limit	3 ppm CO
Resolution	0.1 ppm CO
Accuracy	± 2 ppm or 2 % reading
Temperature compensation	yes
T90 Zeit	< 40 s
Long term drift	< < 2 % signal loss per month
Expected operation life	3 years in air
Storage life	6 months in packaging
Storage temperature	5 .. 20 °C

Gas sensor module NO2-2
Type	JES smart/ECS-NO2-2
Measuring method	Electrochemical cell
Measured value	Gas concentration in ppm
Measuring range	Configurable within 0 .. 2 ppm _NO2 typical 0 .. 2 ppm NO₂
Maximum overload	10 ppm NO₂
Lower detectable limit	0.05 ppm NO₂
Resolution	0.02 ppm NO₂
Accuracy	± 0.05 ppm or 5 % reading
Temperature compensation	yes
T90 Zeit	< 60 s
Long term drift	< < 2 % signal loss per month
Expected operation life	2 years in air
Storage life	6 months in packaging
Storage temperature	5 .. 20 °C

Gas sensor module NO2-20
Type	JES smart/ECS-NO2-20
Measuring method	Electrochemical cell
Measured value	Gas concentration in ppm
Measuring range	Configurable within 0 .. 20 ppm NO₂ typical 0 .. 10 ppm NO₂
Maximum overload	200 ppm NO₂
Lower detectable limit	0.5 ppm NO₂
Resolution	0.05 ppm NO₂
Accuracy	± 0.5 ppm or 2 % reading
Temperature compensation	yes
T90 Zeit	< 60 s
Long term drift	< < 2 % signal loss per month
Expected operation life	2 years in air
Storage life	6 months in packaging
Storage temperature	5 .. 20 °C

Gas sensor module NO-100
Type	JES smart/ECS-NO-100
Measuring method	Electrochemical cell
Measured value	Gas concentration in ppm
Measuring range	Configurable within 0 .. 100 ppm NO typisch 0 .. 30 ppm NO (see EN 50545-2 and ISO 23431)
Maximum overload	200 ppm NO
Lower detectable limit	1 ppm NO
Resolution	0.05 ppm NO
Accuracy	± 0.5 ppm or 2 % reading
Temperature compensation	yes
T90 Zeit	< 10 s
Long term drift	< < 2 % signal loss per month
Expected operation life	3 years in air
Storage life	6 months in packaging
Storage temperature	5 .. 20 °C

Gas sensor module NO-25
Type	JES smart/ECS-NO-25
Measuring method	Electrochemical cell
Measured value	Gas concentration in ppm
Measuring range	Configurable within 0 .. 25 ppm NO overload up to 0 .. 30 ppm NO (see EN 50545-2 and ISO 23431)
Maximum overload	50 ppm NO
Lower detectable limit	0.2 ppm NO
Resolution	0.05 ppm NO
Accuracy	± 0.2 ppm or 2 % reading
Temperature compensation	yes
T90 Zeit	< 10 s
Long term drift	< < 2 % signal loss per month
Expected operation life	3 years in air
Storage life	6 months in packaging
Storage temperature	5 .. 20 °C

Analogue / relay output module ARO
Type	JES smart/CORE-ARO
Analogue outputs	3 x 4 – 20 mA
Analogue output type	2 wire, active
Relay outputs	3 x SPST-NO
Contact rating	60 W (30 VDC, 2 A)

Variants with gas sensor are delivered with smart/ECS-TMP PT1000 sensor:

smart/ECS-TMP Temperature sensor (optional)
Type	JES smart/ECS-TMP
Temperature sensor	Pt1000 DIN B, R₀: 1000 Ω, Temperature coefficient: 3.850 x 10^-3/°C, Standard: DIN EN 60751
Sensor sleeve material	Stainless steel 1.4571 (AISI 316Ti)
Cable material	Silicon
IP rating	IP 67
Cable length	30 cm (longer on request)
Temperature range	-60 .. +180 °C
Humidity range	5 .. 95% relative humidity (non-condensing)
Storage temperature	-30 .. +70 °C

Variants without gas sensor are delivered with smart/AQM-TMP PT100 sensor:

smart/AQM-TMP Temperature sensor (optional)
Type	JES smart/AQM-TMP
Temperature sensor	Pt100 DIN B, R₀: 100 Ω, Temperature coefficient: 3.850 x 10^-3/°C, Standard: DIN EN 60751
Sensor sleeve material	Stainless steel 1.4571 (AISI 316Ti)
Cable material	Silicon
IP rating	IP 67
Cable length	30 cm (longer on request)
Temperature range	-60 .. +180 °C
Humidity range	5 .. 95% relative humidity (non-condensing)
Storage temperature	-30 .. +70 °C

Conformities
Electrical standards	2014/35/EU Low Voltage Directive (LVD) 2014/30/EU Electromagnetic compatibility (EMC) EN IEC 61000-6-2:2019 Immunity standard for industrial environments EN IEC 61000-6-3:2007 + A1: 2011 Emission standard for residential, commercial and light-industrial environments EN 61010-1 Safety requirements for electrical equipment for measurement, control and laboratory use EN 61326-1 Electrical equipment for measurement, control and laboratory use – EMC requirements
Tunnel safety	AT: RVS 09.02.22 DE: RABT2006 CH: ASTRA RL 13001, Fachhandbuch BSA NO: Norwegian Public Roads Administration Handbook No. 021 Road Tunnels
Gas monitoring	EN 50545-1 AT: ÖNORM M9418, ÖNORM M9419 DE: VDI 2053

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Data sheet DE (PDF)

Data sheet EN (PDF)

Monitoring of air quality – visibility and gases

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smart/AQM Air Quality Monitor

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