Banner T30 User Manual
OPPOSED
P
POLAR RETRO
FIXED-FIELD
T30 Sensors - DC-Voltage Series
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Self-Contained, DC-Operated Sensors
• Featuring EZ-BEAM® technology, the specially designed optics and electronics provide reliable
sensing without the need for adjustments
• “T” style plastic housing with 30 mm threaded lens in opposed, retroreflective or fixed-field
modes
• Completely epoxy-encapsulated to provide superior durability, even in harsh sensing environments rated to IP69K
• Innovative dual-indicator system takes the guesswork out of sensor performance monitoring
• Advanced diagnostics to warn of marginal sensing conditions or output overload
• 10 to 30V dc; choose SPDT (complementary) NPN or PNP outputs (150 mA max. ea.)
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 deenergized sensor output condition.
Models
Sensing Mode Model
1
Output Range LED
T306E -
60 m (200 ft) Infrared, 950 nmT30SN6R NPN
T30SP6R PNP
T30SN6LP NPN
6 m (20 ft) Visible Red, 680 nm
T30SP6LP PNP
T30SN6FF200 NPN
200 mm (8 in) cutoff
T30SP6FF200 PNP
T30SN6FF400 NPN
400 mm (16 in) cutoff
Infrared, 880 nm
T30SP6FF400 PNP
T30SN6FF600 NPN
600 mm (24 in) cutoff
T30SP6FF600 PNP
Fixed-Field Mode Overview
T30 Series self-contained fixed-field sensors are small, powerful, infrared diffuse mode sensors with far-limit cutoff (a type of background
suppression). Their high excess gain and fixed-field technology allow detection of objects of low reflectivity, while ignoring background
surfaces. The cutoff distance is fixed. Backgrounds and background objects must always be placed beyond the cutoff distance.
Fixed-Field Sensing – Theory of Operation
The T30FF compares the reflections of its emitted light beam (E) from an object back to the sensor’s two differently aimed detectors, R1
and R2. See Figure 1. Fixed-Field Concept on page 2. If the near detector's (R1) light signal is stronger than the far detector's (R2)
light signal (see object A in the Figure below, closer than the cutoff distance), the sensor responds to the object. If the far detector's (R2)
light signal is stronger than the near detector's (R1) light signal (see object B in the Figure below, beyond the cutoff distance), the sensor
ignores the object.
1
Standard 2 m (6.5 ft) cable models are listed. To order 9 m (30 ft) cable: add suffix W/30 (for example, T306EW/30). To order 4-pin Euro-style QD models: add suffix Q (for example,
T306EQ). A model with a QD connector requires a mating cable; see Cables on page 7.
P/N 121524 Rev. A 2/13/2013
R1
R2
Lenses
Object
A
Object B
or
Background
Sensing
Range
Cutoff
Distance
E
Receiver
Elements
Near
Detector
Far
Detector
Emitter
Object is sensed if amount of light at R1
is greater than the amount of light at R2
Sensing
Axis
R2
R1
E
T30 Sensors - DC-Voltage Series
The cutoff distance for model T30 Series sensors is fixed at 200, 400 or 600 millimeters (7.9 in, 16.7 in, or 23.6 in). Objects lying beyond
the cutoff distance are usually ignored, even if they are highly reflective. However, under certain conditions, it is possible to falsely detect
a background object (see Background Reflectivity and Placement on page 2).
Figure 2. Fixed-Field Sensing Axis
Figure 1. Fixed-Field Concept
In the drawings and information provided in this document, the letters E, R1, and R2 identify how the sensor’s three optical elements
(Emitter “E”, Near Detector “R1”, and Far Detector “R2”) line up across the face of the sensor. The location of these elements defines the
sensing axis, see Figure 2. Fixed-Field Sensing Axis on page 2. The sensing axis becomes important in certain situations, such as those
illustrated in Figure 5. Object Beyond Cutoff - Problem on page 3 and Figure 6. Object Beyond Cutoff - Solution on page 3.
Sensor Setup
Sensing Reliability
For highest sensitivity, position the target object for sensing at or near the point of maximum excess gain. See Performance Curves on
page 5 for the excess gain curves for these sensors. Maximum excess gain for all models occurs at a lens-to-object distance of about
40 mm (1.5 in). Sensing at or near this distance makes the maximum use of each sensor’s available sensing power. The background
must be placed beyond the cutoff distance. Note that the reflectivity of the background surface also may affect the cutoff distance. Following these guidelines will improve sensing reliability.
Background Reflectivity and Placement
Avoid mirror-like backgrounds that produce specular reflections. False sensor response will occur if a background surface reflects the
sensor’s light more to the near detector (R1) than to the far detector (R2). The result is a false ON condition (Figure 3. Reflective Back-
ground - Problem on page 3). To cure this problem, use a diffusely reflective (matte) background, or angle either the sensor or the
background (in any plane) so the background does not reflect light back to the sensor (Figure 4. Reflective Background - Solution on
page 3). Position the background as far beyond the cutoff distance as possible.
An object beyond the cutoff distance, either stationary (and when positioned as shown in Figure 5. Object Beyond Cutoff - Problem on
page 3), or moving past the face of the sensor in a direction perpendicular to the sensing axis, may cause unwanted triggering of the
sensor if more light is reflected to the near detector than to the far detector. The problem is easily remedied by rotating the sensor 90°
(Figure 6. Object Beyond Cutoff - Solution on page 3). The object then reflects the R1 and R2 fields equally, resulting in no false
triggering. A better solution, if possible, may be to reposition the object or the sensor.
2 www.bannerengineering.com - tel: 763-544-3164 P/N 121524 Rev. A
E = Emitter
R1 = Near Detector
R2 = Far Detector
R2
R1
E
Fixed
Sensing
Field
Strong
Direct
Reflection
to R1
Core of
Emitted
Beam
Cutoff
Distance
Reflective
Background
T30FF
E = Emitter
R1 = Near Detector
R2 = Far Detector
R2
R1
E
Fixed Sensing Field
Strong Direct
Reflection
Away
From Sensor
Core of
Emitted
Beam
Cutoff
Distance
Reflective
Background
T30FF
Fixed
Sensing
Field
Cutoff
Distance
R1 = Near Detector
R2 = Far Detector
E = Emitter
T30FF
R1
E
R2
Reflective
Background
or
Moving Object
E = Emitter
R2 = Far Detector
R1 = Near Detector
T30FF
E, R2, R1
Fixed
Sensing
Field
Cutoff
Distance
Reflective
Background
or
Moving Object
T30 Sensors - DC-Voltage Series
Figure 3. Reflective Background - Problem
Figure 4. Reflective Background - Solution
A reflective background object in this position or moving across
the sensor face in this axis and direction may cause false sensor
response.
Figure 5. Object Beyond Cutoff - Problem
A reflective background object in this position or moving across
the sensor face in this axis will be ignored.
Figure 6. Object Beyond Cutoff - Solution
Color Sensitivity
The effects of object reflectivity on cutoff distance, though small, may be important for some applications. It is expected that at any given
cutoff setting, the actual cutoff distance for lower reflectance targets is slightly shorter than for higher reflectance targets. This behavior is
known as color sensitivity.
For example, an excess gain of 1 (see Performance Curves on page 5) for an object that reflects 1/10 as much light as the 90% white
card is represented by the horizontal graph line at excess gain = 10. An object of this reflectivity results in a far limit cutoff of approximately 190 mm (7.5 in) for the 200 mm (8 in) cutoff model, for example; thus 190 mm represents the cutoff for this sensor and target.
These excess gain curves were generated using a white test card of 90% reflectance. Objects with reflectivity of less than 90% reflect
less light back to the sensor, and thus require proportionately more excess gain in order to be sensed with the same reliability as more
reflective objects. When sensing an object of very low reflectivity, it may be especially important to sense it at or near the distance of
maximum excess gain.
P/N 121524 Rev. A www.bannerengineering.com - tel: 763-544-3164 3
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