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crossflow
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Home Environmental monitoring Gas analysers Open path, cross bore air flow monitor
viconox tunnel sensor
VICONOX tunnel atmosphere monitor
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airflow
FIXED POINT ANEMOMETER FOR TUNNELS
Dynoptic

Open path, cross bore air flow monitor

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

Brand

Dynoptic

Elements

Airflow, Speed

Industries

Environmental & water treatment

Phase

Gas, Solids

Categories: Automotive, CEMS, Gas analysers Tags: airflow, monitor, tunnels
  • Description
Description

The CROSSFLOW is an open path, cross bore air flow monitor designed to measure air speed and direction in multi-lane and bidirectional tunnels.  The system uses reliable ultrasonic transit time measurements between a pair of transceivers which are mounted and aligned on either side of the tunnel.

The CROSSFLOW is a self-contained, intelligent analyser with industry standard SCADA / PLC interface options including Current Outputs, Digital Relays and RS485 (Modbus RTU). The wall mounted alignment bracketry and quick lock cable plugs ensure the CROSSFLOW is easy to install and commission. With no moving parts the CROSSFLOW is very easy to maintain, there are no regular offline servicing requirements beyond an annual check and clean.

FEATURES

  • Proven ultrasonic transit time measurement technology
  • Measurement independent of temperature, pressure and composition of the tunnel atmosphere
  • Choice of interface options enabling easy integration into tunnel control system
  • CROSSFLOW-T model with integrated temperature sensor
  • Optional extended warranty and 5 year refurbishment programs are available

BENEFITS

  • Rugged construction design to withstand corrosive tunnel atmospheres and regular tunnel washing
  • Pre-calibrated “Fit and Forget” transceiver
  • Prewired interconnecting cable and termination points saves time during the installation
  • No moving parts and low maintenance requirements
  • The CROSSFLOW is designed to tolerate high sided vehicles momentarily passing through the Ultrasonic signal path ensuring uninterrupted air flow readings.

SPECIFICATION

Measurement Performance (Air Flow)

No. Parameter Units Min Max Comment
1 Measuring Principle Ultrasonic transit time (open path)
2 Measurement Path m 5 25
3 Measurement Range m/s
mph
-20
-45
+20
+45
User selectable
(also available as ft/min or kph)
4 Measurement Angle deg 30 60
5 Resolution m/s 0.1 Display resolution
6 Accuracy % -2 +2 Relative to reading
7 Lower Detection Limit m/s 0.1
8 Damping seconds 1 999 User selectable
Response time ~3x damping

Measurement Performance (Air Temperature)

No. Parameter Units Min Max Comment
9 Measuring Principle RTD
10 Measurement Range °C -20 +70 User selectable (also available °F)
11 Resolution °C 0.1 Display resolution
12 Accuracy °C -0.5 +0.5
13 Damping seconds 1 999 Response time ~3x damping

Power

No. Parameter Units Min Max Comment
14 Voltage Vdc +24
15 Voltage Tolerance % -10 +10
16 Nominal Current Consumption mA 300
17 Power Up Current Consumption mA 300

Inferface Options

No. Parameter Units Min Max Comment
18 Serial Outputs Modbus RTU via RS485
External USB
19 Analogue Outputs (two or four) mA 0 /2 /4 20 Isolated and scalable (user selected)
20 Digital Relay Contacts (three) A 0 3 @30Vdc (signal level and data vaild)

Physical

No. Parameter Units Min Max Comment
21 Ingress Protection IP67
22 Operating Temperature °C -25 +55
23 Operating Humidity % 100
24 Operating Pressure hPa 600 1100
25 Regulatory Compliance 2014/30/EU (Electromagnetic Radiation)
2014/35/EU (Low Voltage)
26 Materials
Transceiver Enclosure

Power coated stainless steel (ASI316)
27 Dimensions mm 96 x 158 x 197 (Each head without collimating tube)
28 Weight kg 2.5 Each head
29 Warranty Months 24 Return to base warranty. Extensions available

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