Balluff BLT 31M User manual

BLT 31M
850196 * VER 03 * H21; Subject to modification. Replaces edition 0708* ALTENDORFR * ORD 0777
Luminescence Sensors
Operating Instructions
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Table of Contents
Table of Contents............................................................................................................................................... 2
Cautions and Warnings...................................................................................................................................... 3
Certifications ..................................................................................................................................................... 3
Product Overview.............................................................................................................................................. 4
Specifications..................................................................................................................................................... 4
Quick Start Guide .............................................................................................................................................. 5
Operation ........................................................................................................................................................... 5
Power up........................................................................................................................................................ 5
Intensity display mode................................................................................................................................... 5
Threshold....................................................................................................................................................... 5
Local Lock..................................................................................................................................................... 5
Programmable Parameters............................................................................................................................. 6
LED Intensity Level (U)............................................................................................................................ 6
Hysterisis Level (H)................................................................................................................................... 6
Discrete Output Configuration .................................................................................................................. 6
Caution: ..................................................................................................................................................... 6
Extend Output Pulse (P) ................................................................................................................................6
Null Offset (nu) ............................................................................................................................................. 7
Gain Adjustment (r)....................................................................................................................................... 7
Teach Function .............................................................................................................................................. 7
Input/Output Signals.......................................................................................................................................... 7
Discrete Output.............................................................................................................................................. 7
Analog Output ............................................................................................................................................... 7
Remote Lock/Unlock Input ........................................................................................................................... 8
Spot size table.................................................................................................................................................... 8
Display Indicators.............................................................................................................................................. 8
Indicators ....................................................................................................................................................... 8
Display decimal points .................................................................................................................................. 8
M12 connector pin assignments ........................................................................................................................ 8
Pin 4............................................................................................................................................................... 8
Ordering information..................................................................................................................................... 9
Accessories .................................................................................................................................................... 9
Dimensional Details .......................................................................................................................................... 9
Demonstration target for BLT 31M................................................................................................................. 10
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Cautions and Warnings
Caution: The discrete output must not be connected to outputs from other sensors (i.e. outputs
from multiple sensors must not be connected in parallel). Parallel connections may
damage sensor output circuitry.
Langue Française Attention:
La LED UV rayonne la lumière UV intense lors du fonctionnement.
N'examinez pas directement la lumière UV lors du fonctionnement de dispositif. Ceci
peut être nocif aux yeux, même pour la brève période due à la lumière UV intense.
Si le visionnement de la lumière UV est nécessaire, employez svp les verres filtrés UV
pour éviter des dommages d'oeil par la lumière UV.
• Évitez l'exposition directe d'oeil à la lumière UV. Subsistance hors de l'extension des
enfants.
Certifications
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Product Overview
The BLT 31M sensor effectively detects UV luminescent materials and markers. The modulated UV light
source in the BLT 31M is directed toward a target and the visible light, resulting from the fluorescence of
the material, is reflected back to the sensor. When the reflected light level exceeds the threshold the discrete
output changes state. Due to the fast response of the sensor, it is suitable for use in high-speed applications.
The 50mm lens accessory allows for very small spot size for fine resolution applications. The sensor
provides both an analog and a discrete output. The analog output signal has a 0 to 5 V range with 20mV
resolution. A PLC or a computer can be used to process the analog output and monitor the status of the
discrete output signal.
The BLT 31M is a reliable, compact sensor with long range sensing capabilities. Two seven segment
displays provide visual representation of the relative intensity from 00 to 50. Easy two step sensitivity, and
3 LED intensity settings provide for flexible operation over wide range of distances and materials.
Specifications
UV light source 370nm UV LED, min.100,000 hours
LED Intensity 3 levels (low, medium and high)
Relative Intensity Display Range 00 to 50
Sensitivity X1, X10
Detection Range Up to 12” (300mm) Depending on model
Switching Frequency 6 kHz
Brightness level Two 7 segment digits
Brightness threshold Two 7 segment digits
Analog Output 0 – 5 V (20mV resolution)
Digital Output Auto-Detect PNP / NPN
Extend Output Pulse 0 - 90 mS (10 steps)
Output Function NO/NC selectable
On/Off Delay <50 uS
Security Remote LOCK / UN-LOCK
Power indicator Green LED 7 segment display
Detect indicator Red LED
Programming indicator Green LED
Security Remote LOCK / UN-LOCK
Data retention EEPROM non—volatile memory
Dimensions 2.0”(51mm) x 2.4”(61mm) x 0.9”(23mm)
Weight 0.21 lbs. (95 g)
Supply Voltage 10…24 VDC
Operating Current 60 mA
Short Circuit Protection Yes (Outputs)
Overload / Reverse Polarity Protection Yes (Supply Voltage)
Operating temperature -20ºC…55ºC
Storage temperature -20ºC…70ºC
Housing Metal alloy
Mechanical protection IP67

Quick Start Guide
1. The display range is 00 through 50. The decimal points indicate the LED intensity level.
The RED LED above the display indicates that the intensity level exceeds the threshold setting.
2. Connect cable to power supply observing correct polarity. Reference wiring diagram.
3. NOTE: The remote lock input, pin 5 on the connector (gray wire), must be left unconnected or pulled
to ground to allow operation of keys on sensor.
4. Apply power; sensor will initialize and perform its power up sequence.
5. The relative intensity will be displayed. By aiming the sensor away from any objects the display will
indicate 00. Aim the sensor at your target or a white piece of paper and the display will indicate an
intensity measurement. Move the target further away from the sensor to decrease the intensity level.
6. Press and release either key located below the display to view the current threshold setting. While the
current threshold is shown on the display, press the + or – key to increase or decrease the setting,
then wait several seconds for the sensor to return to the normal intensity display mode.
7. User programmable parameters are discussed in detail in the following sections.
Operation
Power up
Upon power up, the sensor initializes by turning on all segments on the display and sequencing through red,
yellow and green on the status LED located above the display.
Intensity display mode
During normal operation the sensor display will indicate the relative intensity of a target within its field of
view. The range of the relative intensity display is 00 through 50. The decimal points on the display indicate
the LED output intensity. No decimal points indicate low, one decimal point indicates medium and two
decimal points indicate high intensity.
Threshold
When the relative intensity level exceeds the threshold setting the red status LED will turn on and the
discrete output will activate, indicating detection of the target. When the relative intensity level drops below
the threshold (as determined by the hysterisis setting), the red LED will extinguish and the discrete output
will de-activate. The threshold setting allows the user to select the detection level. The default setting is 15.
While the current threshold is shown on the display, press the + or – key to increase or decrease the setting,
then wait several seconds for the sensor to return to the normal intensity display mode.
Local Lock
The local lock feature allows the sensor to be locked out, preventing adjustments by unauthorized personnel.
To lock the sensor, press the P/- and T/+ buttons for 3 seconds until LL is displayed. To un-lock the sensor,
press the T/+ and P/- for 3 seconds until LL is not displayed. While the sensor is locked, pressing either P/-
or T/+ will result in LL (Local Lock) indication on the display.
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Programmable Parameters
All adjustments made to these parameters are stored in memory and are retained when power is removed. To
enter programming mode press and hold the P/-key for several seconds, the LED intensity setting will be
displayed. Press and release the P/-key to scroll through the various settings. Press and release the T/+ key
to change a particular setting. Press and hold the P/- for several seconds to return to the normal intensity
display mode. The user programmable items are described below:
.
LED Intensity Level (U)
The LED intensity is indicated on the display as U1, U2 and U3 for low, medium and high intensity.
Press and release the T/+ key to to ggle through the 3 intensity levels. The def ault setting is U2,
medium intensity.
Hysterisis Level (H)
The hysterisis setting is indicated by H0 through H9. The hysterisis level is how far below the
threshold the signal must fall to de-activate or un-detect. The hysterisis can be set from 0 to 9. For
example, if the threshold is set at 25 and the in tensity exceeds 25, the sensor will detect and activate
its output. With the hysterisis set to 5, the sign al must drop to 20 to un-detect. This feature is useful
in cases where there may be variation within a target that might cause the intensity to drop below the
threshold slightly; the hyster isis allows the out put to re main activated until th e level dro ps
significantly. Press and release the T/+ key to change the hysterisis setting. The default setting is 2.
Discrete Output Configuration
This setting allows the user to select either normally open (no) or normally closed (nc) configuration.
The normally open configuration de -activates the output during no rmal un-detect operation, and
activates the output upon detect. The norm ally closed configuration activates the output during
normal un-detect operation, and de-activates the output upon detect. Press and release the T/+ key to
toggle through the selections. Default is normally open.
Caution:
The discrete output must not be connected to outputs from other sensors (i.e. outputs from
multiple sensors must not be connected in parallel). Parallel connections may damage sensor
output circuitry.
Extend Output Pulse (P)
This feature allows extending the minimum length of time that the discrete output remains active following
target detection. The sensor response can be in the 100 μs (microsecond) range, i.e. a target can move
through the sensing range in 100 μs and the discrete output would active for only that duration. A slower
acquisition system (PLC) may not sample its inputs at a fast enough rate to capture the signal. The discrete
output pulse can be extended from 0 to 90 ms (milliseconds) in 10 ms increments as indicated by P0 though
P9 on the display. Press and release the T/+ key to toggle through the selections.
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Null Offset (nu)
NOTE: Always perform the null function when installing or removing optional lens or changing LED
intensities.
The null feature allows the sensor to be “zeroed”. For example, when the target is not in view and there is a
background that causes a reading above zero, the null feature allows this level to be subtracted out, allowing
the display to indicate 00. Press and hold the T/+ key to null the sensor. The display will flash the value that
is being subtracted. To set the sensor back to a true zero, aim the sensor away from any target and repeat the
null process.
Gain Adjustment (r)
To change the gain setting press and release the T/+ key to toggle through the selections. R1 indicates a gain
of 1; R2 indicates a gain of 10. The selected gain is stored in memory and is retained when power is
removed. After changing the gain setting always perform the null offset (nu) to re-zero the sensor.
Teach Function
The teach function allows the user to set the threshold by placing a representative target located at the
required distance and allowing the sensor to determine the optimum LED intensity and setting of the
threshold level.
1. Press and hold the T/+ key for several seconds until the yellow led flashes.
2. Place the target at the appropriate distance from the sensor and press the P/-key. The display will
flash 3 times and the sensor will adjust the LED intensity level to achieve reasonable signal level.
The green LED will flash.
3. Remove the target and press the P/- key. The display will flash 3 times.
4. Exit the teach function and return to the normal operating mode by Pressing the T/+ key for several
seconds.
When in the teach mode the LED flashes constantly, yellow, green or red. Yellow indicates that the sensor
is ready to be taught the Detect level. Green indicates that the sensor is ready to be taught the Undetect
level. Red indicates that the last attempt to teach resulted in an error. If the error occurred during the
teaching of the Detect level then the signal intensity was less than 01. If the error occurred during the
teaching of the Undetect level, then the signal intensity was greater than or equal to the threshold level. In
either case, repeat the teach function to properly set the levels.
Input/Output Signals
Discrete Output
The discrete output is a PNP/NPN configuration allowing the user to provide a load on this output that is
either pulled high to VDC or low to ground. The sensor monitors this level and automatically determines
whether to operate the PNP/NPN driver. This output is typically connected to a PLC. The output remains
active as long as the intensity level exceeds the threshold, in high-speed applications it may be useful to use
the Extend Output Pulse feature to lengthen the signal duration to meet acquisition requirements of the PLC.
Analog Output
The analog output is 0-5V with 20mV resolution (8-bit). Any standard analog input channel typically
available on a PLC may monitor this output. The analog output signal is useful in applications where simply
triggering on the threshold is insufficient. For example, constant real-time monitoring of intensity in process
allows minor fluctuations or trends to be detected permitting corrective action to be taken.
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Remote Lock/Unlock Input
The remote lock feature allows the user to lock out the local controls (keys) to prevent operators from
making unauthorized adjustments. This signal line must be connected to VDC to lock the sensor. This line
may be left unconnected if the lock feature is not used. While the sensor is locked, pressing either P/-or T/+
will result in rL (remote Lock) indication on the display.
Spot size table
Part Number BLT 31M-001-U-S92 BLT 31M-002-U-S92 Part Number BLT 31M-001-U-S92 BLT 31M-002-U-S92
Nominal Sensing 100 mm 300 mm Nominal Sensing 100 mm 300 mm
Spot Diameter * Spot Diameter w/ 50 mm lens * (BLT 31M-PK-1)
20 mm distance 18 mm 18 mm 20 mm distance 8 mm 8 mm
50 mm distance 6 mm 6 mm 38 mm distance 2 mm 2 mm
100 mm distance 5 mm 5 mm 50 mm distance 4 mm 4 mm
150 mm distance 4 mm 75 mm distance 8 mm 8 mm
200 mm distance 8 mm 100 mm distance 13 mm 13 mm
250 mm distance 15 mm 150 mm distance 22 mm
300 mm distance 16 mm
350 mm distance
18mm
* All sizes are approximate
Display Indicators
Indicators
•Green LED Threshold Mode while in Undetect
•Red LED Detect
•Yellow LED Threshold Mode while in Detect
•Green LED blinking Teach Undetect
•Red LED blinking Teach Error
•Yellow LED blinking Teach Detect
T
/+
P/
-
Display decimal points
•None illuminated LED low intensity
•One illuminated LED medium intensity
•Two illuminated LED high intensity
M12 connector pin assignments
M12 Connector Wire Color Description
Pin 1 Brown Power 10 to 24VDC
Pin 2 White Discrete output, PNP/NPN, NO/NC
Pin 3 Blue Ground
Pin 4 Black Analog output 0 to 5V DC
Pin 5 Gray Remote LOCK / UNLOCK input
PNP/NPN
LOCK/UNLOCK
BN 1
WH 2
GY 5
BK 4
BU 3
+
-
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Ordering information
Part Number BLT 31M-001-U-S92 BLT 31M-002-U-S92
Nominal Sensing 100 mm 300 mm
Accessories
BLT 31M-PK-1 BLT 31M-HW-1 C04 AEQ-00-VY-050M
50mm focal lens Bracket M12 5-pin Connector
straight cable (5 m)
Caution: The BLT 31M-PK-1 lens extends 0.015” beyond the back surface of the BLT 31M
Luminescence Sensor
Note: In some cases it may be necessary to mount the BLT 31M to a flat surface. If using the
BLT 31M-PK-1 lens in this type of installation please note that a spacer may be
required.
Dimensional Details
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Demonstration target for BLT 31M
USA
Balluff Inc.
8125 Holton Drive
Florence, KY 41042
Phone: [phone]
Toll-free: 1-800-543-8390
Fax: [phone]
E-Mail: [email protected]
Canada
Balluff Canada, Inc.
2840 Argentia Road, Unit #2
Mississauga, Ontario L5N 8G4
Phone: [phone]
Toll-free: 1-800-927-9654
Fax: [phone]
E-mail: [email protected]
Mexico
Balluff de Mexico S.A.de C.V
Prol. Av. Luis M. Vega #109
Col. Ampliación Cimatario
Queretaro, QRO 76030
Phone: (++52 442) 212-4882, 224-3583, 224-3171
Fax: (++52 442) 214-0536
E-mail: [email protected]
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