U-GAGE S18U Series Sensors with Discrete Output 18 mm Ultrasonic Sensors with TEACH-Mode programming Features Fast, easy-to-use TEACH-Mode programming no potentiometer adjustments Short dead zone Right-Angle Housing One NPN and one PNP output Two bi-colored status LEDs Rugged encapsulated design for harsh environments Choose 2 meter or 9 meter unterminated cable, or 5-pin Euro-style QD connector Straight Housing Wide operating range of -20 to +60C (-13 to +140F) Choose either straight or right-angle housing Temperature compensation Configurable for normally open or normally closed operation Fast response time (5 milliseconds) Ultrasonic Models Model Sensing Supply Housing Cable* Output Number Range Voltage Configuration S18UBA 5-wire, 2 m (6.5 ) cable Straight S18UBAQ 5-pin Euro-style QD 30 to 300 mm Bipolar 10 to 30V dc (1.2 to 11.8 ) NPN/PNP S18UBAR 5-wire, 2 m (6.5 ) cable Right-Angle S18UBARQ 5-pin Euro-style QD * 9 m cables are available by adding suffix W/30 to the model number of any cabled sensor (e.g., S18UBA W/30). A model with a QD connector requires a mating cable see page 10. Information about analog-output models is available on Banners website: www.bannerengineering.com WARNING . Not To Be Used for Personnel Protection Ultrasonic Proximity Mode Never use these products as sensing devices for personnel protection. Doing so could lead to serious injury or death. These sensors do NOT include the self-checking redundant circuitry necessary to allow their use in personnel safety applications. A sensor failure or malfunction can cause either an energized or de-energized sensor output condition. Consult your current Banner Safety Products catalog for safety products which meet OSHA, ANSI and IEC standards for personnel protection. Printed in USA 02/05 P/N 108964 rev. A U-GAGE S18U Series Sensor Discrete Output 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 = distance from the sensor to the target ct D = c = speed of sound in air 2 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. Temperature Effects The speed of sound is dependent upon the composition, pressure and temperature of the gas in which it is traveling. For most ultrasonic applications, the composition and pressure of the gas are relatively fixed, while the temperature may fluctuate. In air, the speed of sound varies with temperature according to the following approximation: C = speed of sound in meters per second C = 20 273 + T m/s m/s C T = temperature in C C Or, in English units: C = 49 460 + T C = speed of sound in feet per second ft/s F ft/s T = temperature in F F Temperature Compensation Changes in air temperature affect the speed of sound, which in turn affects the distance reading measured by the sensor. An increase in air temperature shifts both sensing window limits closer to the sensor. Conversely, a decrease in air temperature shifts both limits farther away from the sensor. This shift is approximately 3.5% of the limit distance for a 20 C change in temperature. The S18U series ultrasonic sensors are temperature compensated. This reduces the error due to temperature by about 90%. The sensor will maintain its window limits to within 1.8% over the -20 to +60 C range. NOTES: Exposure to direct sunlight can affect the sensors ability to accurately compensate for changes in temperature. If the sensor is measuring across a temperature gradient, the compensation will be less effective. The temperature warmup drift upon power-up is less than 1.7% of the sensing distance. After 10 minutes, the apparent distance will be within 0.3% of the actual position. After 25 minutes, the sensing distance will be stable. Banner Engineering Corp. Minneapolis, MN U.S.A. www.bannerengineering.com Tel: 763.544.3164 2 P/N 108964 rev. A