• Intrinsically Safe
  • UL Listed #E226209
  • Input Voltage 16-30 VDC
  • Reverse Polarity Protected
  • Analog Voltage Output
  • Short Circuit Protect
  • Sync/Enable Input Line
  • Various Sensing Ranges
  • Wide Temperature Range
  • Temperature Compensation
  • LED Indicator
  • Self Contained Sensor
  • Chemical Resistance (PVC)
  • Quick Disconnect Connector
Image for RPS-409A-IS sensor.

About the RPS-409A-IS Sensor

The RPS-409A-IS is an intrinsically safe, analog ultrasonic self contained sensor in a 30mm PVC barrel style housing. It is powered by 16-30VDC with reverse polarity protection. It also has a narrow beam angle, which enables it to get into tight places. A flat target can tilt up to 10 degrees and still be detected.

The RPS-409A-IS has a short circuit protected analog 0-10VDC output. Example using the RPS-409A-80-IS: The output is a linear .125 volts per inch. Therefore a target placed 10 inches from the sensor will result in an output of 1.25 volts. Likewise a target placed 80 inches from the sensor will result in an output of 10 volts.

The RPS-409A-IS has built in temperature compensation to provide accurate readings throughout the entire operating temperature range.

An LED indicator is provided. The LED is green when not detecting and changes to red when a target moves into place. The sensor is completely sealed and the connection is made by way of IP and NEMA rated cables.

Besides the input and output lines there is a sync/enable line. This can be used for connecting multiple sensors together to prevent cross-talk, or to trigger the sensor at a particular time.

The RPS-409A-IS is designed to take advantage of today’s PLC and computer analog input cards. The numerical values that are programmed into the PLC or computer will determine the zero and span.

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Model Number Sensor Range Transducer Frequency Response Time Volts Per Inch
RPS-409A-40-IS 4″ to 40″ 175kHz 85ms 0.250V
RPS-409A-80-IS 6″ to 80″ 135kHz 85ms 0.125V
RPS-409A-144-IS 10″ to 144″ 70kHz 175ms 0.069V
RPS-409A-216-IS 12″ to 216″ 70kHz 175ms 0.046V
Power Input: 16 – 30VDC Reverse Polarity Protected
(A minimum of 24VDC must be applied to the safety barrier)
Input Current: 24mA maximum with 24VDC applied to the safety barrier
Ambient Temperature: -40 to 60°C or -40 to 140°F
Humidity: 0 – 95% Non-Condensing
Housing: PVC Housing with PVC sensing face
Output: Analog Voltage Output 0-10V
(Load 100k Ohms to infinity)
Short Circuit Protected
Weight: Sensor only 4 ounces

Ordering Information

DISCONTINUED: The RPS-409A-IS product line has been replaced by the RPS-409A-IS3 product line. Click here to go to the RPS-409A-IS3 page.

Technical Resources


Learn how our ultrasonic sensors work.