WORLD-BEAM QS18U Ultrasonic Sensors
Datasheet
Miniature Ultrasonic Sensors with TEACH-Mode Programming
•
•
•
•
•
•
Fast, easy-to-use TEACH-Mode programming; no potentiometer adjustments
Ultra-compact housing
One discrete output: NPN or PNP, depending on model
Two bi-colored status LEDs
Rugged encapsulated version for harsh environments
Choose 2 meter or 9 meter unterminated cable, 4-pin Euro-style or 4-pin Pico-
style QD connectors (either integral or with 150 mm pigtail)
•
•
•
•
Wide operating range of –20 °C to 60 °C (–13 °F to 140 °F)
Temperature compensation
Configurable for normally open or normally closed operation
Fast response time (15 milliseconds)
WARNING: Not To Be Used for Personnel Protection
Never use this device as a sensing device for personnel protection. Doing so could lead to
serious injury or death. This device does not include the self-checking redundant circuitry necessary
to allow its use in personnel safety applications. A sensor failure or malfunction can cause either an
energized or de-energized sensor output condition.
Models
Models
QS18UNA
QS18UPA
QS18UNAE
QS18UPAE
Sensing Range
TEACH Option
Cable
Supply Voltage
Output
NPN
Integral push button or
remote TEACH (IP67, NEMA
6P)
4-wire, 2 m
(6.5 ft) cable
with shield
PNP
50 mm to 500 mm
(2 in to 20 in)
12-30 V dc
Remote TEACH (epoxy-
encapsulated, IP68, NEMA
6P)
NPN
PNP
Only standard 2 m (6.5 ft) cable models are listed. For 9 m (30 ft) shielded cable, add suffix “W/30” to the model number
(e.g., QS18UNA W/30). A model with a QD connector requires a mating cordset. For QD models:
•
•
•
•
For 4-pin integral Euro-style QD, add suffix “Q8” (for example, QS18UNAQ8).
For 4-pin Euro-style 150 mm (6 in) pigtail QD, add suffix “Q5” (for example, QS18UNAQ5).
For 4-pin integral Pico-style QD, add suffix “Q7” (for example, QS18UNAQ7).
For 4-pin Pico-style 150 mm (6 in) pigtail QD, add suffix “Q” (for example, QS18UNAQ).
Principles of Operation
Ultrasonic sensors emit one or multiple pulses of ultrasonic energy, which travel through the air at the speed of sound. A
portion of this energy reflects off the target and travels back to the sensor. The sensor measures the total time required
for the energy to reach the target and return to the sensor. The distance to the object is then calculated using the
following formula: D = ct ÷ 2
D = distance from the sensor to the target
c = speed of sound in air
t = transit time for the ultrasonic pulse
To improve accuracy, an ultrasonic sensor may average the results of several pulses before outputting a new value.
Original Document
119287 Rev. J
20 July 2015
119287