Migatron RPS-401, RPS-426 Self…

Migatron RPS-401, RPS-426 Self Contained Sensors


  • Self Contained
  • Sensing Range 4-40″, 8-80″
  • Narrow Sensing Beam
  • High Frequency
  • Range & Hysteresis Controls
  • Reverse Polarity Protected
  • Short Circuit Protected
  • Operates in Hostile Environments
  • Operating Voltage 20-30 VDC
  • Isolated N.O. N.C. Solid State Relays
  • RPS-401 in Plastic Housing
  • RPS-426 in Stainless Steel Housing

The RPS-401 and RPS-426 are self-contained ultrasonic sensors in a 30mm barrel housing, powered by 20-30VDC. A sealed transducer provides protection in hostile environments. The sensor can be operated in two modes a proximity and a hysteresis mode. Operating as proximity sensors and level sensors. The frequency of operation for the RPS-401 is 212kHz for the 4″ to 40″ range and 150kHz for the 8″ to 80″range. The RPS-426 has an 8″ to 80″ range, and operates at a frequency of 150kHz. These sensors also have built-in short circuit protection for the outputs as well as reverse polarity protection on the input.

The construction of the RPS-401 sensor is Plastic Valox and the RPS-426 is Stainless Steel. A barrel housing is used 30mm in diameter by 100mm in length. For set up purposes an LED indicator is provided. When not detecting the LED will illuminate green and when detecting the LED will illuminate red. The outputs consist of two solid state relays N.O. N.C. which 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. A standard 6′ cable is provided. An optional quick disconnect plug is available.

 Adjustable Detection Point:
4-40 inches or 8-80 inches

Proximity Detection

Proximity detection is the detection of an object at a given distance. The detection range of the RPS-401,426 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-401 is either 4″ to 40″ or 8″ to 80″. The range of the RPS-426 is 8″ to 80″ only. 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 4″ or 8″. The hysteresis control needs to be off by turning the potentiometer fully counterclockwise.

Adjustable Detection Point:
4 – 40 inches or 8 – 80 inches
Adjustable Turn Off Point:
0.5 – 40 inches or 1 – 80 inches


Hysteresis Detection

The RPS-401,426 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 detect when the target reaches 10″ and stays on as the target moves away to 20″.) This Hysteresis can be adjusted from .5″ to 40″ from the detect point with the 40″ sensor and 1″ to 80″ with the 80″ sensor

Specifications: RPS-401, RPS-426
Operational Range:

Adjustable 4″ to 40″
Adjustable 8″ to 80″
Adjustable 8″ to 80″

Power Input:20-30 VDC
Reverse Polarity Protected

Input Current:50 Milliamps
Humidity:0- 95% Non-Condensing

RPS401 Housing:

RPS-426 Housing:

420D Valox plastic with a
silicon rubber sensing face.
303 Grade Stainless Steel with a 316
Grade Stainless Steel sensing face.

Output:2 Solid State Relays
N.O. N.C.
Isolated 1500 Vrms
2 – 130VAC or VDC
100 mA DC or 50mA AC Continuous
Short Circuit Protected

Transducer Frequency:4″ to 40″ 8″ to 80″
PRS-401: 212kHz RPS-401: 150kHz
RPS-426: 150kHz

Response Time:4″ to 40″ 8″ to 80″
30mS ——— 50mS

Weight:11 ounces

A-Angle of Tilt
B-Beam Spread
C-Wiring Diagram with Potted in Cable
D-Wiring Diagram with Quick Disconnect
E-“QD” Connector Option (Male View)
F-Mounting Dimensions
For Optional ON/OFF Delays Consult Factory.
“QD” cables are sold separately.





4″ to 40″
8″ to 80″
4″ to 40″
8″ to 80″

2 Solid State Relays N.O. N.C.
2 Solid State Relays N.O. N.C.
2 Solid State Relays N.O. N.C. – Quick Disconnect
2 Solid State Relays N.O. N.C. – Quick Disconnect


8″ to 80″
8″ to 80″

2 Solid State Relays N.O. N.C.
2 Solid State Relays N.O. N.C. – Quick Disconnect


6′ Cable for “QD” Option
20′ Cable for “QD” Option


"*" indicates required fields

This field is for validation purposes and should be left unchanged.