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t/FL-USP Air Flow Sensor


JES t/FL-USP Ultrasonic Point Air Flow Sensor

Features

  • Precise ultrasonic air flow measuring system based on different transition times of ul-trasonic pulses
  • Measurement of airflow at a single point
  • Connection to tunnel control system either via analogue outputs or via RS 485 ASCII
  • Optional, remote smart/HUB touch operating unit to
    • display measured values
    • modify parameters
    • additional outputs

System setup

  • Single sensor for wall-mounting with system cable
  • t/FL-USP-TBX Terminal box for analogue and RS-485 connections
  • Alternative smart/BOX-S-FL-USP Terminal box for t/FL-USP air flow sensor with JES smart/CORE IoT gateway and operating unit
  • Optional smart/HUB touch operating unit

Operation

The air flow monitoring system measures the air flow based on different transmission times of ultrasonic pulses sent in one or the other direction.

The arms of this single point air flow sensor are directed in the longitudinal axis of the tunnel. Ultrasonic pulses are exchanged between the two sensor arms.

Air flow in the tunnel influences the transition time of the pulses between sender and receiver. Based on the difference in transition times of ultrasonic pulses sent in one or the other direction the measured values are calculated.

Measured values are air speed, air flow rate, direction of air flow and air temperature

Advantanges

  • Specifically developed for application in tunnels
  • No control unit required
  • Easy configuration
  • Corrosion resistant against aggressive tunnel atmosphere
  • Sensors can be replaced quickly with no tools and no re-alignment required
  • Minimised spare requirements
  • Extremely low maintenance requirements

Application

Tunnels are important infrastructure elements in road networks and facilitate the connection of regions.

Environmental conditions in tunnels are influenced by fog, particles and emissions and need to be monitored to protect people on their passage through the tunnel from danger and impacts on their health. Accidents in tunnels, and particularly fires, can have dramatic consequences and can prove extremely costly in terms of human life, increased congestion, pollution and repair costs. At every time people in the tunnel need to be supplied with breathable air and sufficient visibility.

Since 1990 JES Elektrotechnik GmbH develops, installs and maintains systems to monitor air characteristics and lighting conditions in tunnels. Our systems are robust, durable and resistant against the corrosive atmosphere in a tunnel. They operate reliably and have a high accuracy in measurement.

All systems fulfil the requirements of the EC guideline 2004/54/EC (Minimum safety requirements for tunnels in the trans-European road network) and the more detailed national guidelines and provisions:

  • Austria: RVS 09.02 Tunnelausrüstung
  • Germany: RABT Richtlinien für die Ausstattung und den Betrieb von Straßentunneln
  • Switzerland: ASTRA Richtlinien und Fachhandbuch Betriebs- und Sicherheitsausrüstungen (BSA)

Our range of products for tunnel covers systems for monitoring of

  • Visibility (extractive or in-situ)
  • Toxic gases like CO, NO, NO2 (extractive or in-situ)
  • Air velocity, direction and temperature
  • Luminance (access, threshold and interior zone)
  • Illuminance


Technical Specifications

Air flow measurement
Type JES t/FL-USP
Measuring method Determination of direction dependant differential transition times of ultrasonic pulses
Measured values / ranges / resolution Air velocity
Direction of air flow
Acoustic-virtual temperature		 0 .. 75 m/s
1° or 181°
-50 .. 70 °C		 0.1 m/s
n/a
0.1 °C
Accuracy ≤ 5 m/s: ± 0.1 m/s (rms, mean over 360°)
> 5 m/s: ± 2 % (rms, mean over 360°)
Alignment in tunnel longitudinal axis

Outputs
Digital interface 1 x RS-485 MODBUS ASCII with different telegrams
Analogue output 2 x 4-20 mA, max. 400 Ω, assignable to air velocity, direction or acoustic-virtual temperature
Output range configurable, typically: -20 to 20 m/s for air velocity

Ultrasonic sensor

Ultrasonic Sensor
Type JES t/FL-USP-USS
Operating voltage 8 .. 42 VDC or
12 .. 28V AC
Power consumption typ. 1.5 VA, max. 2.5 VA
Heating 24 VAC/DC ± 15 %; typ. 45VA, max. 60VA @ 24V
Appliance class Class III
Material Stainless steel 1.4404 (AISI 316L)
IP rating IP 67
Dimensions 422 x 287 mm
Weight Sensor 2.5 kg
Indoor/Outdoor use Indoor use (tunnel)
Altitude up to 2,000 m
Temperature range -50 .. 80 °C (heated)
-30 .. 80 °C (unheated)
Humidity range 0 .. 100% relative humidity (non-condensing)
Pollution degree 4 (intended environment)


t/FL-USP-TBX Terminal box

Terminal box t/FL-USP-TBX
Type t/FL-USP-TBX
System cable port 1 (for t/FL-USP Sensor)
Power supply 100 to 240 VAC, 50/60 Hz
Supply voltage fluctuations ± 10 %
Overvoltage category II
Power rating 60 W
Appliance class Class I
Material Stainless steel 1.4404 (AISI 316L)
Mounting incl. mounting clamp made from Stainless steel 1.4404 for wall mounting
IP rating IP 69
Dimensions 250 x 160 x 110 mm
Weight approx. 3.2 kg
Indoor/Outdoor use Indoor use (tunnel)
Altitude up to 2,000 m
Temperature range -40 .. +60 °C
Humidity range 0 .. 100% relative humidity (non-condensing)
Pollution degree 4 (intended environment) / 2 (when cover removed)

smart/BOX-S-FL-USP gateway (instead of t/FL-USP-TBX for Ethernet connection)

smart/Architecture gateway for t/FL-USP - smart/BOX-S-FL-USP
Type smart/BOX-S-FL-USP
System cable port 1 (for t/FL-USP Sensor)
Power supply 100 to 240 VAC, 50/60 Hz
Supply voltage fluctuations ± 10 %
Overvoltage category II
Power rating 60 W
Appliance class Class I
Digital interfaces MODBUS RTU (RS-485)
MODBUS/TCP (Ethernet)
Webserver for configuration (Ethernet)
Material Stainless steel 1.4404 (AISI 316L)
Mounting incl. mounting clamp made from Stainless steel 1.4404 for wall mounting
IP rating IP 69
Dimensions 250 x 160 x 110 mm
Weight approx. 3.2 kg
Indoor/Outdoor use Indoor use (tunnel)
Altitude up to 2,000 m
Temperature range -40 .. +60 °C
Humidity range 0 .. 100% relative humidity (non-condensing)
Pollution degree 4 (intended environment) / 2 (when cover removed)

Conformities

Conformities
Markings
Electrical standards 2014/35/EU Low voltage directive (LVD)
2014/30/EU Electromagnetic compatibility (EMC)
2011/65/EU RoHS 1 directive 2012/19/EU WEEE Directive
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 IEC 63000:2019-05 Technical documentation for the assessment of electrical and electronic products with respect to the restriction of hazardous substances
Tunnel safety standards Austria: RVS 09.02.22
Germany: RABT 2006
Switzerland: ASTRA RL 13001, Fachhandbuch BSA
Norway: Norwegian Public Roads Administration Handbook No. 021 Road Tunnels
International: ISO 23431 Measurement of road tunnel air quality