Banner QT50U User Manual

U-GAGE QT50UVR Series Sensors

117764

Datasheet

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

• SPDT electromechanical relay for high-capacity switching

• Universal supply voltage: 85 to 264 V ac / 48 to 250 V dc

• Rugged encapsulated design for harsh environments

• Models available with factory-installed Teflon® flange and film coating
bonded over the transducer for protection from harsh environments

• Unique housing design allows for multiple mounting configurations

• Choose models with integral 2 m (6.5 ft) or 9 m (30 ft) cable, or with

Figure 1. Standard Model

Teflon® is a registered trademark of Dupont
Information about dc-voltage models is available on Banner’s website:

www.bannerengineering.com

Figure 2. Teflon-Protected Model

Mini-style or Micro-style quick-disconnect fitting

• Wide operating range of –20 °C to 70 °C (–4 °F to 158 °F)

• Temperature compensation

™

Models Sensing Range Cable

QT50UVR3W

QT50UVR3WQ 5-pin Mini-style QD
QT50UVR3F 5-wire, 2 m (6.5 ft) cable
QT50UVR3FQ1 5-pin Micro-style QD
QT50UVR3FQ 5-pin Mini-style QD

200 mm to 8 m (8 inches

to 26 ft)

5-wire, 2 m (6.5 ft) cable

1

Operation Model

Window-limit (N.O.and N.C.)QT50UVR3WQ1 5-pin Micro-style QD

Fill-level control (pump-in and

pump out)

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.

Overview

Ultrasonic sensors excel in position-monitoring applications and in applications involving clear or multi-colored targets.
QT50UVR sensors are available in a variety of models: dc sensors with either analog or two discrete outputs, or universal

voltage models that feature an SPDT electromechanical relay for switching larger loads. Programming and setup for the
universal voltage models are accomplished using the sensor’s two push buttons.

Models are available with Teflon sensor face and hex nut, plus Teflon-coated transducer and special o-rings for use in
harsh environments, such as fill-level monitoring in an acidfilled tank.

1

To order the 9 m cable models, add suffix W/30 to the model number of a cabled sensor (for example, QT50UVR3W w/30).
Models with a QD connector require a mating cable.

Original Document
117764 Rev. F

21 April 2014

C

m/s

= 20 √

273 + T

C

ft/s

=

49 √460 + T

F

C

U-GAGE QT50UVR Series Sensors

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.

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:

In metric
units:

C

= speed of sound in meters per second C

m/s

TC = temperature in °C TF = temperature in °F

In English units:

= speed of sound in feet per second

ft/s

Temperature Compensation

The speed of sound changes roughly 1% per 6° C (10° F). QT50U series ultrasonic sensors have temperature
compensation available; temperature compensation will reduce the error due to temperature by about 90%.

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 farther away from the sensor. Conversely, a decrease in
air temperature shifts both limits closer to the sensor. This shift is approximately 3.5% of the limit distance for a 20° C
change in temperature. With temperature compensation enabled, the sensor will maintain the window limits to within

1.8% over the entire -20° to +70° C (−4° to +158° F) range.

NOTE:

• If temperature compensation is enabled, 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.

• With temperature compensation enabled, the temperature warmup drift upon power-up is less
than 1.0% of the sensing distance. After 30 minutes, the apparent switchpoint will be within

0.5% of the actual position. After 60 minutes, the apparent switchpoint will be within 0.3% of
the actual position.

Configuration

The sensor can be configured for one of three output response times and to enable or disable temperature compensation.
Both are accomplished using the sensor’s Speed push button, using the procedures described below. A button click is
defined as: 0.04 ≤ Click ≤ 0.8 sec.

1. Select the output response time.

Action

Click the Speed button until the desired output response time is
selected.

2 www.bannerengineering.com - tel: [phone] P/N 117764 Rev. F

Result

Response LED cycles throughSolid Red, Solid Amber, and OFF
to indicate selected Output Response Time.

• Solid Red — Slow Response (1600 ms)

• Solid Amber — Medium Response (400 ms) (factory
default)

• OFF — Fast Response (100 ms)

U-GAGE QT50UVR Series Sensors

Action Result

No further action required; sensor stores selection and remains in
RUN mode.

2. Enable or disable the temperature compensation.

Action Result

Push and hold the Speed push button for 10 seconds to enter
programming mode.

Click the Speed button to toggle between enable and disable. Response LED flashes:

Push and hold the Speed button for 10 seconds to return to Run
mode.

Response LED flashes:

• Flashing Amber — Temperature Compensation is
enabled (default).

• Flashing Red — Temperature Compensation is disabled.

• Flashing Amber — Temperature Compensation is
enabled (default).

• Flashing Red — Temperature Compensation is disabled.

• Sensor stores selection.

• Sensor returns to Run mode.

• Response LED returns to a solid color or OFF to indicate
current Output Response Time setting.

Status Indicators

Power ON/OFF LED (Green) — ON when sensor power is ON.
Signal LED (Red) — indicates incoming signal strength and condition.

Signal LED Status

ON Bright Good signal
ON Dim Marginal signal strength
OFF No signal is received 2 or target is beyond the sensor's range limitations

Output LED (Amber or Red) — indicates the target position relative to the window limits, or TEACH mode status.

Output LED Status
RUN Mode Window-Limit Sensor Models Fill-Level Control Sensor Models

ON Amber Target is within window limits Level has dropped below far limit
OFF Target is outside window limits Level has risen above near limit

TEACH Mode

ON Red Waiting for first limit to be taught
Flashing Red Waiting for second limit to be taught

Response LED (Amber or Red) — indicates sensor output response time selection.

Indicates

Indicates

Response LED Status

ON Red Slow response (1600 ms)
ON Amber Medium response (400 ms)
OFF Fast response (100 ms)

2

If no signal is received, the output reacts as if the target is beyond the far limit. The normally open output will be OFF, and the
normally closed output will be ON.

P/N 117764 Rev. F www.bannerengineering.com - tel: [phone]

Indicates

A

B

C

D

E

F

Output OFF Output ON Output OFF

Minimum

Limit

Maximum

Limit

Output ON Output ONOutput OFF

Minimum

Limit

Maximum

Limit

Normally Closed Output

Normally Open Output

U-GAGE QT50UVR Series Sensors

Sensor Programming

Two TEACH methods may be used to program the sensor, using the TEACH button:

• Teach individual minimum and maximum limits.

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

A - TEACH button
B - Sensor power indicator
C - Target signal strength indicator
D - Speed button
E - Output response time indicator
F - Output ON indicator

Figure 3. Sensor features

Teaching Minimum and Maximum Limits

Teach procedures are identical for window-limit and fill­level control models. Window-limit models function as
shown in the figure on the right, and fill-level control
models function as shown in Figure 5 on page 5. To
readjust minimum or maximum limits, repeat the teach
procedure.

A button click is defined as: 0.04 s. ≤ Click ≤ 0.8 s.

Figure 4. Teaching independent minimum and maximum limits —

1. Enter programming mode.

Action

Push and hold TEACH button for 2 seconds Output LED turns solid red and the sensor waits for first limit

window limit models

Result

2. Teach the first limit.

Action

Position the target for the first limit.
Click the TEACH button. The sensor learns the first limit position and the Output LED

3. Teach the second limit.

4 www.bannerengineering.com - tel: [phone] P/N 117764 Rev. F

Result

changes to flashing red