RPS-401/4260 pages

RPS-401, RPS-426
Features
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Self Contained
Sensing Range 4-40", 8-80"
Narrow Sensing Beam
High Frequency
Range & Hysteresis Controls
Reverse Polarity Protected

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Short Circuit Protected
Operates in Hostile Environments
Operating Voltage 20 - 30VDC
Isolated N.O. N.C. Solid State Relays
RPS-401 in Plastic Housing
RPS-426 in Stainless Steel Housing

The RPS-401 and 426 are stud-mounted, completely self-contained, 20-30VDC powered ultrasonic sensors. A sealed transducer provides protection in hostile
environments. The sensor can be operated in two modes, a
proximity and a hysteresis mode, as described below. The
frequency of operation for the RPS-401 is 212kHz for the
4" to 40" and 150kHz for the 8" to 80". The RPS-426 has
a 8" to 80" range and operates at a frequency of 150kHz.
These sensors also have a 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

4"
8"

Adjustable
Detect Pt.

40"
80"

Proximity Detection

purposes a LED indicator is provided. The LED will illuminate green when nothing is detected and will illuminate red
when something is detected. 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 Detect Pt.
4 - 40" or 8 - 80"

Adjustable Turn Off Pt.
0.5 - 40" or 1 - 80"

Hysteresis Detection

Proximity Detection

Hysteresis 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 - 40" or 8 - 80". The range of the RPS-426
is 8 - 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.

The RPS-401,426 is furnished with Hysteresis Control by means
of a second potentiometer. This control allows you to adjust the
turnoff 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 0.5 - 40" from the detect point with the 40" sensor
and 1 - 80" with the 80" sensor.