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
BENEFITS
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 |
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| 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) |
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| 26 | Materials Transceiver Enclosure |
Power coated stainless steel (ASI316) |
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| 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 |
