MICROSONIC® THRU-BEAM
SENSORS
Model SM100 Series
MICROSONIC®
Thru-beam
Sensors
•• Self contained
• Meets NEMA 4X (indoor
use only) & IP67
standards
• Survives harsh
environments
• No sensitivity
adjustments
• Sensing ranges up to
1,829 mm (72")
Industry proven, these
MICROSONIC® sensors
increase “uptime” with
reliable, thru-beam
sensing in harsh, highspeed
environments
In response to problems directly
attributed to the harsh environments
in which sensors
operate today, Hyde Park offers
broad application solutions with
this industry-proven line of ultrasonic
thru-beam sensors. First
produced in 1974, the
MICROSONIC® SM100 series
sensors are a “workhorse” in the
Hyde Park product line with tens
of thousands of units continuing
to perform a variety of thrubeam
sensing functions
throughout the world.
Using the world’s leading ultrasonic
sensing technology, the
MICROSONIC® SM100 series
sensors perform precise object
detection. Of objects from transparent
containers to metal parts
as small as 6.4 mm (1/4") diameter
at speeds in excess of
2,000 units per minute.
Unlike photoelectrics, these
stainless steel sensors are virtually
unaffected by splashing
food, caustic cleaning solutions,
frequent high-pressure washdowns,
humidity, changing light
conditions or colors, dust, and
ambient noise. The rugged sensors
need no maintenance and
require no sensitivity adjustments
to compensate for inconsistent
product materials.
Response times range from 4
ms down to 0.6 ms. The 12 to
24 VDC circuitry and output signal
make these sensors directly
compatible with many programmable
logic controllers, computers,
and other logic control systems.
Operation
The MICROSONIC® sensors
are continuous-wave devices
that consist of an ultra-high-frequency
transmitter and receiver
positioned opposite each other,
illustrated below, at a distance
of up to 1,829 mm (72"). During
operation, the
transmitter sends
a continuous ultrasonic beam
which is picked up by the receiver.
When an object of any
material or shape passes between
the
transmitter and receiver
and breaks the beam,
object presence is detected and
the output of the receiver
switches. Or, when a hole as
small as 3 mm (1/8 inch) diameter
allows the beam to pass
through to the receiver, the out-
5-3
put of the receiver switches.
With all circuitry compactly
sealed in the stainless steel
transmitter and receiver probes,
the MICROSONIC® sensors
boast a narrow, constanthighfrequency
sonic beam for high
sensing resolution.
The thru-beam sensing mode
is set up by mounting the sensors
on the same axis opposite
each other as shown in Figure
1. The distance (range) between
the
transmitter face and receiver
face can be up to 1,829 mm
(72"), depending on the model
and range selected.
Positioning of the
transmitter
and receiver for operation is extremely
important for the reliable
detection of objects, particularly
small ones. As the figure
also shows, the width of the
transmitted sound beam initially
expands at a rate of 10 degrees
(5 degrees each side of the common
axis) as the distance between
the
transmitter and receiver
increases. This means
that if the distance between the
transmitter and receiver is too
