Ranges: 2-40″, 5-80″
Broad Beam Sensor
On/Off Output

Download RPS-150 Datasheet

Product Description

  • Adjustable Sensing Range
  • Broad Sensing Beam
  • Range 2 to 40″, or 5 to 80″
  • LED Indicator
  • Adjustable Hysteresis
  • 105-130VAC or 20-30VDC Power
  • Isolated N.O., N.C. Solid State Relays
  • Limit Switch Style Housing

The RPS-150 family of self-contained, wide beam angle, ultrasonic sensors can be used as proximity sensors or level sensors. The advantage of this sensor is that the target does not have to be at right angles with the sensor in order to be detected. A flat target can tilt up to 35 degrees and still be detected. For set-up purposes an LED indicator is provided. When in the non-detect state the LED is Green and when in the detect state the LED is Red. The RPS-150 can be operated in two modes: a proximity and a hysteresis mode, described to the right.

The frequency of operation is 38.5kHz. There are two ranges available in this model: 2″ to 40″ or 5″ to 80″. The sensor is available with a 120VAC power input or a 20 – 30VDC input.It also features a quick disconnect receptacle. The housing is constructed of plastic valox and has standard 30mm X 60mm limit switch mounting dimensions, as well as side holes for mounting the sensor on its side. The output consists of two solid state relays N.O. N.C., and can switch 2 – 130VAC or VDC up to 100mA DC or 50mA AC continuous. The relay outputs are short circuit protected and isolated up to 1500 volts rms.

Download RPS-150 Datasheet

Proximity Detection

Proximity detection is the detection of an object at a given distance. The detection range of the RPS-150 is controlled by the “Range Control” potentiometer. Any object within the desired range is detected, while objects out of range are ignored. The range of the RPS-150 is either 2″ to 40″ or 5″ to 80″. This means that in the proximity mode the object will be detected from whatever detect point is set to the minimum sensing range of the sensor, either 2″ or 5″. The hysteresis control potentiometer needs to be off by turning the pot counterclockwise.

Hysteresis Detection

The RPS-150 is furnished with Hysteresis Control by means of a second potentiometer. This control allows you to adjust the turn-off point while the range control adjusts the turn-on point. (Example: Range pot set for 10″, Hysteresis pot set for 20″. With these settings the sensor will come on when the target reaches 10″ and stays on as the target moves away to 20″.) This Hysteresis can be adjusted to start from the detect point over a range of .5″ to 40″ with the 40″ sensor and 1″ to 80″ with the 80″ sensor.

Product Specifications


Specifications : RPS-150
Operational Range: Adjustable
2″ to 40″
5″ to 80″
Hysterisis: Adjustable
.5″ to 40″
1″ to 80″
Input Current:
Ambient Temperature
15 mA VAC
or 35 mA VDC
0 C to 60 C
or 32 F to 140 F
Transducer Housing:
0% -95% Non -Condensing
Plastic Valox Limit Switch Style
2 Solid State Relays N.O. N.C.
Isolated 1500Vrms
2 to 130VAC or VDC
100 mA DC or 50mA AC Continous
Short Circuit Protected
Transducer Frequency: 38.5kHz
Response Time: 2″ to 40″ 5″ to 80″
On – 60mS – 120mS
Off – 60mS – 120mS
Weight of Controller: 9.5 ounces
Accuracy: .187″ or .5% (.005) of the range,
whichever is greater at 70 degrees F.


  1. Angle of Tilt
  2. Beam Spread
  3. Wiring Diag. – For RPS-150DC
  4. Wiring Diag. – For RPS-150AC
  5. Connection Diagram (Male View)
  6. Mounting Dimensions

NOTE: For Optional On/Off Delays Consult Factory.”QD” cables are sold separately


2″ – 40″
5″ – 80″
Isolated Form C Relay – Quick Disconnect
2″ – 40″
5″ – 80″
Isolated Form C Relay – Quick Disconnect
6′ Cable for Quick Disconnect
20′ Cable for Quick Disconnect

Description of Pump Up / Pump Down Control

This is a description of how the RPS-150 or the RPS-401 can be used as a two point level control.

Pump Up

A. When the pump control relay is connected to the normally closed output of the sensor and the container is empty the pump will start up when power is applied. The container will fill until the liquid level rises to the range potentiometer setting.

B. This is the highest level. At this time the sensor output will change state and the pump will shut off. The output will latch in that state until the liquid level descends to the point where the hysteresis potentiometer is set.

C. This is the lowest level. At this point the sensor will change state, turning on the pump and latch until the level rises to the range potentiometer setting again. Then the process repeats.

Pump Down

Wire the pump relay to the normally open contact. This will reverse the process.