ULTRASONIC SENSOR
752
US-N300
Thru-beam Type Ultrasonic Sensor
Suitable for Detecting
Transparent Films or
Transparent Bottles
Reliable Detection of Transparent Objects
The sensor reliably detects transparent
films or transparent objects.
Only 16mm thick
Its 16mm thick compact body allows
mounting in a narrow space.
Simple Operation Mode Selection
The operation mode can be selected
either sound-received-ON or sound-
blocked-ON simply by changing the
connection of the control input wire.
APPLICATIONS
Detecting transparent film or
transparent glass Detecting transparent bottles Detecting transparent and opaque
objects
US-N300
Thru-beam Type
ULTRASONIC SENSOR
US-N300
ORDER GUIDE
Type Appearance Sensing range Model No.
Thru-beam
300mm US-N300
SPECIFICATIONS
Environmental resistance
753
300mm
Transparent, translucent or opaque object: 20⳯20mm or more, Hole: 10⳯10mm or more
12 to 24V DCⳲ10% Ripple P-P 10% or less
Transmitter: 35mA or less, Receiver: 35mA or less
NPN transistor universal
•Maximum sink current: 100mA
•Residual voltage: 1V or less (at 100mA sink current)
Selectable either sound-received-ON or sound-blocked-ON by the control input
Incorporated
5ms or less
Red LED (lights up when the output is ON)
Continuously variable adjuster
220kHz approx.
IP62 (IEC)
0 toⳭ50⬚C (No dew condensation), Storage:ⳮ25 toⳭ70⬚C
35 to 85% RH, Storage: 35 to 85% RH
Power line: 1,000Vp, and 1!s pulse width; Radiation: 2,000Vp, and 1!s pulse width (with noise simulator)
1,500V AC for one min. between all supply terminals connected together and enclosure
20MΩ, or more, with 500V DC megger between all supply terminals connected together and enclosure
10 to 55Hz frequency, 1.5mm amplitude in X, Y and Z directions for two hours each
100m/s2acceleration (10G approx.) in X, Y and Z directions for three times each
Enclosure: Polycarbonate
0.2mm24-core (transmitter: 2-core) cabtyre cable, 2m long
Extension up to total 100m is possible, for both transmitter and receiver, with 0.2mm2, or more, cable.
Transmitter: 80g approx., Receiver: 85g approx.
MS-N30 (Sensor mounting bracket): 2 sets, Adjusting screwdriver: 1 No.
Sensing range
Sensing object
Supply voltage
Current consumption
Output
Output operation
Short-circuit protection
Response time
Operation indicator
Sensitivity adjuster
Transmission frequency
Protection
Ambient temperature
Ambient humidity
Noise immunity
Voltage withstandability
Insulation resistance
Vibration resistance
Shock resistance
Material
Cable
Cable extension
Weight
Accessories
Type
Item Model No.
Thru-beam
US-N300
US-N300
Thru-beam Type
ULTRASONIC SENSOR
US-N300
Thru-beam Type
US-N300
I/O CIRCUIT AND WIRING DIAGRAMS
D1
Tr 100mA max.
ZD
4.7kΩ
D2
m1
Ⳮ
ⳮ
12 to 24V DC
Ⳳ10%
Load
Sensor circuit
Users’ circuitInternal circuit
Color code
(Brown)ⳭV
(Black) Output
(Blue) 0V
(Pink) Control input
I/O circuit diagram
Note: The transmitter has only two power supply wires (ⳭV and 0V).
Symbols ... D1:
Reverse supply polarity protection diode
D2: Reverse current protection diode
ZD: Surge absorption zener diode
Tr : NPN output transistor
SENSING CHARACTERISTICS (TYPICAL)
Setting distance L (mm)
Left Right
Center
Operating point#(mm)
40 20 0 20 40
#
LReceiver
Transmitter
0
100
200
300
400
Parallel deviation
Setting distance L (mm)
Left Right
Center
Operating angle $( ⬚ )
0
100
200
300
400
40 20 0 20 40
L
Receiver
Transmitter
$
Angular deviation
Brown
Black
Blue
Pink
Load
m1
12 to 24V DC
Ⳳ10%
Ⳮ
ⳮ
Wiring diagram
or or
Non-voltage contact, NPN open-collector transistor or
NPN non-contact transistor
m1
Low (ⳮ0.5 toⳭ1.5V, or connected to 0V): sound-received-ON
High (6V to supply voltage, or open): sound-blocked-ON
Setting distance L (mm)
Left Right
Center
Operating point #(mm)
0
100
200
300
400
20 10 0 10 20
#
L
Transmitter
Receiver50⳯50mm
Sound insulation board
Sensing field
754
US-N300
PRECAUTIONS FOR PROPER USE
This product is not a safety sensor. Its use is not
intended or designed to protect life and prevent body
injury or property damage from dangerous parts of
machinery. It is a normal object detection sensor.
Receiver
Sensing axis
Wall or curtain
Transmitter
Keep a distance of 20mm or more
Influence of surrounding objects
Influence of an object parallel to the sensing axis
Influence of background objects
•
If there is a wall or a curtain near the sensing axis, the
sound reflection may cause the operation to be unstable.
<Countermeasure>
•If sensor heads are installed as shown in the figure below,
the operation may become unstable by the reflected sound
wave.
Transmitter Sensing object Placed perpendicular
to the sensing axis.
Receiver
Background
An object, hard and
plain like a glass plate,
reflects the sound
wave.
Receiver
Transmitter
Object
10ⴗ approx.
<Countermeasure>
The receiver should be placed away from the object and at
an angle to it as shown below.
Parallel mounting Face-to-face mounting
Receiver Transmitter
Receiver
Transmitter
Transmitter Receiver Transmitter
Receiver
Keep a distance of 10mm or more
Keep a distance of
100mm or more
1
Transmitter
Receiver Receiver
Transmitter Transmitter
Back-to-back mounting is possible.
2
Mutual interference
•When two or more sensors are mounted closely, the sen-
sors may not enter the ‘sound-blocked state’ due to mutu-
al interference.
<Countermeasure>
2-M4⳯15mm
screws with
washers
Sensor mounting
bracket
MS-N30
(Accessory)
Mounting
•The tightening torque should be 0.49N䡠m or less.
Sensitivity adjustment
•Normally, use the sensor at the maximum sensitivity.
However, if the sensing is not proper due to surrounding
objects (reflection from surrounding objects, etc.), adjust
the sensitivity as follows.
755
Transmitter Receiver
Object absent Object present
Transmitter Receiver
Object
sound-received state sound-blocked state
1Set the adjuster to Min. Then, without any sensing
object, turn the adjuster gradually clockwise, while see-
ing the operation indicator, to determine the point where
the sensor enters the ‘sound-received state’.
2With a sensing object between the sensor heads, turn
the adjuster further clockwise until the sensor enters the
‘sound-received state’ again. Then, turn the adjuster
back a little to determine the point where the sensor just
enters the ‘sound-blocked state’.
3Set the adjuster at the center of the two points described
in 1and 2, which is the optimum sensitivity position.
Sensitivity adjuster
Min. Max.
sound-blocked state
with sensing object
Optimum sensitivity
sound-received state
without sensing object
Sensing range
755
ULTRASONIC SENSOR
US-N300
Thru-beam Type
ULTRASONIC SENSOR
US-N300
Thru-beam Type
US-N300
PRECAUTIONS FOR PROPER USE
Traveling speed and minimum sensing object width
•Minimum sensing object width is 20⳯20mm in the station-
ary condition.
The minimum sensing width of a traveling object is related
to the traveling speed and the sensor response time by the
following formula.
W: Minimum sensing object width (m)
W⳱VTⳭA (m) V : Traveling speed of the object (m/sec.)
T : Sensor response time⳱0.005 (sec.)
A : Minimum sensing object width in the stationary
condition⳱0.02 (m)
Example: If V⳱10m/sec.
W⳱10⳯0.005Ⳮ0.02⳱0.07m
⳱70mm
Wiring
•Make sure to carry out the wiring in the power supply
off condition.
•Verify that the supply voltage variation is within the rating.
•If power is supplied from a commercial switching regulator,
ensure that the frame ground (F.G.) terminal of the power
supply is connected to an actual ground.
•In case noise generating equipment (switching regulator,
inverter motor, etc.) is used in the vicinity of this product,
connect the frame ground (F.G.) terminal of the equipment
to an actual ground.
•Do not run the wires together with high-voltage lines or
power lines or put them in the same raceway. This can
cause malfunction due to induction.
Others
•Do not use during the initial transient time (50ms) after the
power supply is switched on.
•The ultrasonic sound propagates through the air.
If the sensor is used at a place where air blows or the tem-
perature suddenly changes (near a door, an air condi-
tioner, etc.) the operation may become unstable. Avoid
using US-N300 at such places.
•Take care that the sensor may malfunction due to an
intense extraneous sound, such as, metal impact
sound.
•Do not expose the transmitting element or the receiving
element to moisture or dust. It may affect the sensing
operation.
DIMENSIONS (Unit: mm)
US-N300 Sensor
12.6
28
7.4
12.1
8.3
(2)
13
43
60
4
7.5
20
"13
20
16
Sensitivity adjuster (receiver only)
Operation indicator (Red) (Receiver only)
2-M4⳯0.7
thru-hole threads
"4.8 cable 2m long
MS-N30 Sensor mounting bracket (Accessory)
12
4
19 4.3
4.3 4
20
30
20
8
20
32
37
12
t2 4-"4.3 holes
20
4 4.3
4.3 43239
(2) 28
8875
322812
2055
30
t 2
19
35
39
4-"4.3 holes
756
Assembly dimensions
Mounting drawing
with the receiver
Material: Cold rolled carbon steel (SPCC)
Two M4 (length 15mm) screws with washers are attached.
