Crossflow
Multi-lane, bidirectional tunnel anemometer
The CROSSFLOW provides an open path, cross bore solution for measuring air velocity and direction in a tunnel.
Crossflow
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 15 |
25 35 |
CROSSFLOW CROSSLOW-L |
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 |
m/s % |
-0.1 -2 |
+0.1 +2 |
Relative to reading |
7 | Damping | seconds | 1 | 999 |
User selectable (Response time ~3x damping) |
Measurement Performance - Air Temperature (Crossflow-T only)
No. | Parameter | Units | Min | Max | Comment |
---|---|---|---|---|---|
8 | Measuring Principle | RTD | |||
9 | Measurement Range | °C | -20 | +70 | User selectable (also available as °F) |
10 | Resolution | °C | 0.1 | Display resolution | |
11 | Accuracy | °C | -0.5 | +0.5 | |
12 | Damping | seconds | 1 | 999 |
User selectable (Response time ~3x damping) |
Power
No. | Parameter | Units | Min | Max | Comment |
---|---|---|---|---|---|
13 | Voltage | Vdc | +24 | ||
14 | Voltage Tolerance | % | -10 | +10 | |
15 | Nominal Current Consumption | mA | 300 | ||
16 | Power Up Current Consumption | mA | 300 |
Inferface Options
No. | Parameter | Units | Min | Max | Comment |
---|---|---|---|---|---|
17 | Serial Outputs |
Modbus RTU via RS485 External USB | |||
18 | Analogue Outputs (two) | mA | 0 /2 /4 | 20 | Isolated and scalable (user selected) |
19 | Digital Relay Contacts (three) | A | 0 | 3 | @30Vdc (signal level and data vaild) |
Physical
No. | Parameter | Units | Min | Max | Comment |
---|---|---|---|---|---|
20 | Ingress Protection | IP67 | |||
21 | Operating Temperature | °C | -25 | +55 | |
22 | Operating Humidity | % | 100 | ||
23 | Operating Pressure | hPa | 600 | 1100 | |
24 |
Materials Transceiver Enclosure |
AISI/SAE 316L Stainless steel | |||
25 | Dimensions | mm | 96 x 158 x 197 Each head (without dust tube) | ||
26 | Weight | kg | 2.5 | Each head | |
27 | Regulatory Compliance |
2014/30/EU (Electromagnetic Radiation) 2014/35/EU (low Voltage) | |||
28 | Design Life | Years | 20 | ||
29 | MTBF | Years | >20 | ||
30 | Warranty | Months | 24 | Return to base warranty. Extensions available |
Download brochures
Please select which product you are interested in and complete your details below to download your digital product brochure.
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.
View our other Tunnel Sensors
Below are our flagship tunnel sensor products, simply select them for more information