280-IRU-9400 Ultrasonic Level Sensor 
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Range from 0.5 to 35 ft (150 mm to 10.67 m)
Self-contained sensor
Works for water and snow level
Easy to install
Internal temperature compensation
Virtually maintenance free
Programmed via computer interface using the RST-3001 (USB) or the RST-2001A (RS232) module or RS232 and Windows™ compatible software
Optional Outputs:
4-20 mA
0-2.5 V or 0-5 V (selectable via software)
The 280-IRU-9400 Ultrasonic Sensor uses ultrasonic technology to provide a non-contact method of detecting level of water or snow. The ultrasonic sensor transmits pulsed waves of high frequency sound. If the sound wave meets a reflective object, such as liquid, it bounces back toward the sensor. The sensor records the time required for the sound wave to travel to the target and return. Using the speed of sound, which is a well-known variable, the sensor calculates the distance to the object.
Until recently, the many factors that influence the speed of sound created inaccurate readings. Now with low cost microprocessor technology, many of these variables can be factored into the equation and eliminated. Temperature change is one such variable. The IRU-9000 sensors use internal temperature compensation to offset the effects of these changes. The IRU-9000 can also compensate for other variables, such as wave action, agitators, and humidity. Sensor adjustments are made via a computer USB interface using an RST module* and Windows™ compatible software.
* The RST module is sold separately. The software is included with RST unit.
Specifications
Operating Range: 0.5 to 35 feet (0.15 to 10.67 meters)
Available Outputs: 4-20 mA, 0-2.5 V / 0-5 V (selectable via software)
Operating Voltage: 12-28 Vdc
Programming Voltage: 15-28 Vdc
Total Current Draw: 75 mA @ 24 Vdc
Maximum Power Rating: 2.5 W
Housing: Polycarbonate/PET blend
Mounting: 2 inch NPT or 3/4 inch NPT
Transducer Type: Electrostatic
Ratings: NEMA 12
Approvals: CSA General Purpose (pending)
Response Time: Programmable (20 ms minimum)
Sample Rate: Programmable (1-22 Hz)
Resolution: 0.1 inch (2.5 mm)
Accuracy: ± 0.25% of detected range (with no temperature gradient)
Adjustments: USB interface using RST-3001, or RS232 interface using RST-2001A
Operating Temperature: -40° to +140° F (-40° to 60° C)
Beam Pattern: 9° off axis (at full signal strength and sensitivity settings)
Electrical Connection: Pigtail
Frequency: 50 kHz
Ordering Information
280-IRU-9423-C6 Ultrasonic Sensor, 4-20 mA
Includes 6' cable, specify if additional cable is required
Note: this is a 4-wire device (not loop powered)
280-IRU-9429-C6 Ultrasonic Sensor, 0-2.5 V / 0-5 V
Includes 6' cable, specify if additional cable is required
280-RST-2001A RST Module, RS232
280-RST-3001 RST Module, USB
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Water Level and Flow
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