Banner S18U User Manual

U-GAGE™ S18U Series Sensors with Analog Output

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B

Aug 2013

18 mm Ultrasonic Sensors with TEACH-mode programming

Features

• Fast, easy-to-use TEACH-Mode programming; no potentiometer adjustments

Right-Angle Housing

Straight Housing

• Short dead zone

• Scalable output automatically distributes the output signal over the width of the
programmed sensing window

• 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

• Wide operating range of -20° to +60°C (-4° to +140°F)

• Choose either straight or right-angle housing

• Temperature compensation

• Selectable response times of 2.5 or 30 ms

• Select analog models with either 0-10V dc or 4-20 mA output

Models

Model

Number

S18UUA

S18UUAQ

S18UIA

S18UIAQ

S18UUAR

S18UUARQ

S18UIAR

S18UIARQ

* 9 m cables are available by adding suffix “W/30” to the model number of any cabled sensor (e.g., S18UUA W/30).
A model with a QD connector requires a mating cable; see page 10.

Sensing

Range

30 to 300 mm

(1.2" to 11.8")

Cable*

5-wire, 2 m (6.5') cable

5-pin Euro style QD

5-wire, 2 m (6.5') cable

5-pin Euro style QD

5-wire, 2 m (6.5') cable

5-pin Euro style QD

5-wire, 2 m (6.5') cable

5-pin Euro style QD

Supply

Voltage

10 to 30V dc

Output

0 to 10V dc

4 to 20 mA

0 to 10V dc

4 to 20 mA

Ultrasonic

Housing

Configuration

Straight

Right-Angle

Information about discrete models is available on Banner’s website: www.bannerengineering.com

WARNING . . .

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 110738 rev. A

Not To Be Used for Personnel Protection

U-GAGE™ S18U Series Sensor — Analog Output

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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:

2

To improve accuracy, an ultrasonic sensor may average the results of several pulses
before outputting a new value.

ct

D =

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.

D = distance from the sensor to the target
c = speed of sound in air
t = transit time for the ultrasonic pulse

In air, the speed of sound varies with temperature according to the following
approximation:

C

C

Or, in English units:

C

= 20 √273 + T

m/s

= 49 √460 + T

ft/s

C

F

= speed of sound in meters per second

m/s

TC = temperature in °C

C

= speed of sound in feet per second

ft/s

TF = temperature in °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 sensor’s 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.

2 P/N 110738 rev. A

www.bannerengineering.com • Tel: [phone]

U-GAGE™ S18U Series Sensor — Analog Output

Power/

Signal Strength

LED

TEACH/
Output Indicator
LED

TEACH
Push Button

PWR OUT

TEACH

Minimum
Operating

Range

Near
Setpoint

Far

Setpoint

Maximum
Operating

Range

Target

Ta

rget

Ta

rget

Ta

rget

Dead Zone

Output

Power

Output

Power

Output

Power

ON:
Green

OFF

Output

Power

OFF

ON:
Green

ON:
Yellow

ON:
Green

OFF

ON:
Red

OFF

B

Sensor Programming

Two TEACH methods may be used to program the sensor:

• Teach individual minimum and maximum limits, or

• Use Auto-Window feature to center a sensing window around the taught position.

The sensor may be programmed either via its push button, or via a remote switch.
Remote programming also may be used to disable the push button, preventing
unauthorized personnel from adjusting the programming settings. To access this
feature, connect the gray wire of the sensor to 0 - 2V dc, with a remote programming
switch between the sensor and the voltage.

NOTE: The impedance of the Remote Teach input is 12 kΩ.

Programming is accomplished by following the sequence of input pulses (see
programming procedures starting on page 4). The duration of each pulse
(corresponding to a push button “click”), and the period between multiple pulses, are
defined as “T”:

0.04 seconds < T < 0.8 seconds

Figure 1. Sensor features

Figure 2. TEACH Interface

Status Indicators

Power ON/OFF LED Indicates

OFF Power is OFF.

ON Red Target is weak or outside sensing range.

ON Green Sensor is operating normally, good target.

Output/Teach LED Indicates

OFF Target is outside window limits.

Yellow Target is within window limits.

ON Red (solid) In Teach Mode, waiting for first limit.

ON Red (flashing) In Teach Mode, waiting for second limit.

Banner Engineering Corp. • Minneapolis, MN U.S.A.

www.bannerengineering.com • Tel: [phone]

P/N 110738 rev. A 3

U-GAGE™ S18U Series Sensor — Analog Output

4

Near

Window

Far

Window

20

Target Position

Analog Output (mA)

Positive

Slope

Current-Sourcing Models

0

Near

Window

Far

Window

10

Target Position

Analog Output (V dc)

Positive

Slope

Voltage-Sourcing Models

T

T T

T

T T

T T

T

T

T T

T

T T

T T

T

or

or

...

D

or

B

Teaching Minimum and Maximum Limits

General Notes on Programming

• The sensor will return to Run mode if the first Teach condition is not registered

within 120 seconds.

• After the first limit is taught, the sensor will remain in Program mode until the Teach

sequence is finished.

• To exit Program mode without saving any changes, press and hold the programming

push button > 2 seconds (before teaching the second limit). The sensor will revert to
the last saved limits.

Analog Output Slope:

The U-GAGE S18U sensor may be programmed for either a positive or a negative
output slope, based on which limit is taught first (see Figure 3). If the Near limit is
taught first, the slope will be positive. If the Far limit is taught first, the slope will be
negative. Banner’s scalable output automatically distributes the output signal over the
width of the programmed sensing window.

In the event of signal loss, the analog output goes to 3.6 mA or 0V dc, which may be
used to trigger an alarm.

Procedure

0.04 < “click” < 0.8 sec.

• Push and hold the
push button

Mode

Programming

• Position the target for
the first limit

Teach

• “Click” the push button • Single-pulse the remote line

First Limit

• Position the target for
the second limit

Teach

• “Click” the push button • Single-pulse the remote line

Second Limit

Push Button

• No action required; sensor is ready for
1st limit teach

• Position the target for the first limit

• Position the target for the second limit

Remote Wire

0.04 sec. < T < 0.8 sec.

Figure 3. Analog output slope

Result

Output LED: ON Red
Power LED: ON Green (good signal) or

ON Red (no signal)

Power LED: Must be ON Green

Teach Accepted

(Sensor learns the 0V dc or 4 mA limit)

Output LED: Flashing Red

Teach Unacceptable

Output LED: ON Red

Power LED: Must be ON Green

Teach Accepted

(Sensor learns the 10V dc or 20 mA limit)

Output LED: Yellow or OFF

Teach Unacceptable

Output LED: Flashing Red

4 P/N 110738 rev. A

Banner Engineering Corp. • Minneapolis, MN U.S.A.

www.bannerengineering.com • Tel: [phone]