RPS-401A, RPS-426A Analog Ultrasonic Sensors0 pages

Migatron Corporation - 1997 401AF
Adjustable Zero & Span
Various Sensing Ranges
Narrow Sensing Beam
LED Strength Indicator
Short Circuit Protected
Reverse Polarity Protected
Analog Current & Voltage Outputs
Selectable Inverted & Non-Inverted Outputs
Self Contained Barrel Housing
Input Voltage 20 - 30VDC
RPS-401A in Plastic Housing
RPS-426A in Stainless Steel Housing
RPS-401A, RPS-426A
Features
Inverted Analog Outputs
The RPS-401A has the ability to invert its analog
outputs, meaning that the current or voltage will
decrease with distance. For the current output to be
inverted the voltage output needs to be tied to the
positive of the supply voltage of the sensor. This
then will invert the current output to 20mA - 4mA.
To make the voltage output inverted 10v - 0v the
current output needs to be tied to the positive of the
supply voltage. In the standard mode of operation
(non-inverted) P1 adjusts the near point 4mA (0v)
and P2 adjusts the far point 20mA (10v). In the nonstandard
mode of operation (inverted) P1 adjusts the
near point 20mA (10v) and P2 adjusts the far point
4mA (0v).
Maximum Analog Ranging
Analog sensing in the Maximum ranging configuration
means detecting an object over a 36" range
with the RPS-401A-40. This 36" span goes from the
sensors minimum sensing distance (4") to its maximum
sensing distance (40"). The adjustment procedure
is the same as described in the minimum analog
ranging section. The RPS-401A-80 and RPS-426A-
80 in the maximum ranging configuration detect an
object over a 72" range. This span goes from the
sensors minimum sensing distance of 8" to its maximum
sensing distance of 80". This sensor also has a
5 : 1 adjustment ratio on its analog output so its
minimum analog ranging capability is a span of 12".
These adjustments are made by the two potentiometers
on the sensor.
Minimum Analog Ranging
Analog sensing in the Minimum sensing configuration
means detecting an object over a 5" range with
the RPS-401A-40. This 5" span can be adjusted to
occur over any part of the sensors range. For example
it could be adjusted to occur from 10" to 15" or 25"
to 30". This is done by means of the two potentiometers
on the sensor. This sensor has a 5 : 1 adjustment
ratio on its analog output, meaning that the RPS-
401A-40 has a maximum span of 36" (range 4" to
40"). The analog output can also be adjusted anywhere
between the 5" and 36" spans. These adjustments
are made by the two potentiometers on the
sensor. With no more then two adjustments of each
potentiometer the desired range will be achieved.
10"
Adjustable 24" Adjustable 4" Adjustable
8"
40"
80"
0v
4mA
10v
20mA
0v
4mA
10v
20mA
10v
20mA
0v
4mA
4" 40"
12" 8" 80"
15" 40" Range
80" Range
40" Range
80" Range 80" Range
40" Range
The RPS-401A, RPS-426A analog ultrasonic sensor
is mounted in a barrel housing and is completely self
contained. It is powered by 20-30VDC and is reverse
polarity protected. It also has a narrow beam angle which
enables it to get into tight places. A flat target can tilt up to 8
degrees and still be detected. The RPS-401A, 426A has 2
short circuit protected analog outputs, 4-20mA and 0-10
VDC. These outputs can easily be inverted and can be
scaled over almost any range by means of adjusting the zero
(P1) & span control (P2). For set-up purposes an LED
strength indicator is provided. This LED is Green when not
detecting and fades to Red as a target moves into place,
depending on how much reflected signal is coming back from
the target. The frequency of operation for the RPS-401A is
212kHz for the 4" to 40" and 150kHz for the 8" to 80". The
RPS-426A has a 8" to 80" range and operates at a frequency
of 150kHz. The RPS-401A barrel is constructed of plastic
valox, and the RPS-426A is Stainless Steel. The barrel
measures 30mm x 100mm. A standard 6' cable is provided.
An optional quick disconnect plug is available.
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