LMI Selcom SLS 5000 User manual

User’s Manual
SLS 5000
SLS 6000
SLS 2401
SLS 2008

LMITechnologies
PROPRIETARY
This document, submitted in confidence, contains proprietary information which
shall not be reproduced or transferred to other documents or disclosed to others or
used for manufacturing or any other purpose without prior written permission of
LMI Technologies Inc.
http://www.sensorsthatsee.com
Trademarks and Restrictions
Selcom is a registered trademark of LMI Technologies Inc.
This product is designated for use solely as a component and as such it does not
comply with the standards relating to laser products specified in U.S. FDA CFR
Title 21 Part 1040.
No part of this publication may be copied, photocopied, reproduced, transmitted,
transcribed, or reduced to any electronic medium or machine readable form
without prior written consent of LMI Technologies Inc.
Printed in The Netherlands.
Information in this document is subject to change without notice.
Copyright (c) 2006 LMI Technologies Inc. All rights reserved.
Printed in The Netherlands.

03-09-05 1
Table of contents
1INTRODUCTION 3
2TECHNICAL DESCRIPTION 4
Identification of parts 4
SLS5000 4
SLS 6000 4
SLS 2401 5
SLS 2008 5
Manufacturers serial number label 6
Measurement principle and definitions 7
Sampling frequency and bandwidth. 8
The analog position sensitive detector 8
Linearization 9
3TECHNICAL DATA 9
Block diagram 9
Dimensions 10
Environmental conditions 10
Power requirements 10
Performance 10
Sensor configuration 11
SLS5000 11
SLS6000 11
SLS2401 12
SLS2008 12
Analog Output 12
Digital Outputs 13
RS232-C 13
Selcom serial synchronous interface 13
RS422 14
Invalid output 14
4SAFETY REQUIREMENT 15
Symbols 15
Safety precautions 15
Summary of user precautions regarding laser 16
Emission delay 16
Safety of Laser products. 17
Maximum Permissible Exposures (MPEs) 17
Laser product classification. 17
Calculation of MPE and NOHD 18
MPE 18
NOHD 18
Warning labels 19
Laser Safety References 20

03-09-05 2
5INSTALLATION 21
Cable requirements 21
Analog output 22
Scale factor current output and engineering units 22
Load conditions for analog output. 25
Alternative connections for valid output 25
Cable crosstalk. 26
Electrical installations, examples 27
Mechanical installation. 29
For a single SLS sensor system 30
For a dual SLS sensor system 30
Hints for measurements 32
Material 33
Unstable thickness reading 35
Surface texture. Static texture error 35
Temperature of the material 37
Geometry of the material. Secondary reflections 37
6SERVICE AND MAINTENANCE 38
Keeping the front glass clean 38
Visual check for damage 38
LED-indicators (Yellow and Green) 39
7APPENDIXES 40
Appendix A, Revision page 40
Appendix B, Accessories 40
Appendix C, SLS-asynch-1, protocol 40
Appendix D, SLS power unit 24 51
Appendix E, Connection table 53
Appendix F, Quality Record 54
Appendix G, Dimensional drawings 57
LMI Technologies AB
Ögärdesvägen 19 A
Box 250,
S-43325 Partille
SWEDEN
Tel: [phone]
Main [phone]
Fax: [phone]
Internet: http://www.lmint.com
LMI Technologies (USA), Inc.
21455 Melrose Ave. Suite 22
SOUTHFIELD MI 48075
USA
Tel: [phone]
Fax: [phone]
LMI Technologies BV
Valkenburgweg 223
6419 AT Heerlen
The Netherlands
Tel: [phone]
Fax: ++31 45 574 2500
LMI Technologies Inc.
205-7088 Ventura Street
Delta, BC, V4G-1H5
Canada
Tel: [phone]
Fax: [phone]
Printed in The Netherlands

03-09-05 3
1 INTRODUCTION
This manual is a description of the Selcom Laser Sensor (SLS) family. The
sensors have laser classification 2, 3R or 3B. Read chapter Laser Safety
precautions before connecting the sensor.
This sensor is intended for use in applications where distance, thickness or level is
to be measured. The ambient temperature surrounding the sensor should be 0°C to
50°C but the temperature of the measured object may vary from deep frozen to
+1600°C. The sensor is equipped with a temperature guard that shuts the laser off
should the surrounding temperature exceed the limits.
No changes or modifications may be made to the sensor or its cable unless you
have a written permission from LMI Technologies. If the sensor is opened or
modified without permission, warranty is voided.
Caution- Use of controls or adjustments or performance of
procedures other than those specified herein may result in
hazardous radiation exposure.
For your own safety, follow the instructions in this manual.
If you get problems when using the SLS sensor, contact your local LMI
Technologies office or your local distributor.
The delivery of a SLS 5000 contains:
• SLS 5000 sensor
• Isolation washers 8 pcs
• Users manual 1 pcs
The delivery of a SLS 6000 contains:
• SLS 6000 sensor
• Isolation washers 4 pcs
• Users manual 1 pcs
The delivery of a SLS 2401 contains:
• SLS 2401 sensor head and SLS Controller
• Isolation washers 4 pcs
• Users manual 1 pcs
The delivery of a SLS 2008 contains:
• SLS 2008 sensor head and SLS Controller
• Isolation washers
• Users manual 1 pcs

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2 TECHNICAL DESCRIPTION
Identification of parts
SLS5000
Figure 1: Identification of parts SLS 5000
SLS 6000
Selcom
LASER MEASUREMENTS
SLS 6000
DANGER
Laser
Class 3B
Laser emitting
label
Air purge inlet Mounting Holes
M8 (4X), top mount
Receiver ApertureLaser aperture, incl laser shutter
Manufactures serial
number label
Emission indicator:
1.Illuminated when power is on
2. GREEN when target is within
the measurement range.
3. YELLOW when no target is present
within the measurement range.
Figure 2:SLS 6000
Mounting holes
SELCOM
SLS5000
Laser emitting
lable
Laser aperture Receiver aperture
Emission indicator device
1, Illuminated when power is ON
2, Green when target is within the
measurment range
3, Yellow when no target is present
within the measurment range
Front glass
Side vie
w
Front view
Laser shutte
r
Manufacturers serial
number label

03-09-05 5
SLS 2401
Emission indicator on 2401 head is RED when laser is ON. Function of Emission
Indicator on SLS controller see previous page
Figure 3. SLS 2401. SLS controller top and 2401 head bottom.
SLS 2008
Emission indicator on SLS2008 sensor head is RED when laser is ON.
Figure 4. SLS controller

03-09-05 6
Figure 5. SLS2008 sensor head
Manufacturers serial number label
Selcom
BOX 250 S-433 25 PARTILLE SWEDEN
810555 SLS2070/200-WO
345 0-20 mA
NOVEMBER 1996
PART NO TYPE
SN OUTPUT
MANUFACTURED:
MONTH YEAR
1
2
4
6
3
5
7
8
Figure 3: Manufacturers serial number label
The serial number label contains the following information:
1. The address of the production location.
2. The part number of the product. Refer to this part number when contacting
LMI Technologies.
3. Type description of the sensor. SLS5070/200-BM means:
SLS5000
Measurement Range = 70 mm
Stand Off = 200 mm
Optimized for Building Material (BM) applications
Other applications are:
MM = Molten metal
RO = Road
RU = Rubber
SW = Saw mill

03-09-05 7
Other letter combinations may occur.
4 Serial number of the sensor. Refer to this serial number when contacting LMI
Technologies.
5 Available outputs, one analog and one digital. The outputs are selected when
ordering the sensor. Possible combinations are:
0-20 mA / Selcom or 4-20 mA / Selcom
0-20 mA / RS422 or 4-20 mA / RS422
RS232 is always available, ref to appendix for details.
6 Month of manufacture.
7 Year of manufacturer
8 CE-mark. Indicates that the product fulfills the emc-directive according to EN
89/336/EEC
Measurement principle and definitions
The SLS sensors consist of a light source and a detector integrated with optics and
electronics. The light source is a semi conductor laser diode operating in a pulsed
mode with 50% duty cycle. The pulse rate or frequency is 16 000 times per
second.
This laser diode illuminates a spot on the surface of the object to be measured,
(log, car body, gypsum board etc.).
The spot is not only detectable to the human eye but also clearly visible to the
detector of the SLS. The detector is situated at the back of the receiver part,
similar to the retina of the human eye.
Stand Off
Distance, SO
Measurement Range, MR
Semiconductor
laser and optics
Receiver optics
PSD
(Position Sensitive photo Detector)
Close End, CE
Far End, FE
Figure 4: Measurement principle and definitions
Depending of the distance between the SLS sensor and the light spot, the Stand
Off distance, the image of the light spot will be focused on a certain spot on the
detector. The detector is a high resolution, position sensitive detector. It converts
the light spot to electrical signals from which the electronics can calculate the
actual distance to the object.
”Moving objects, no problem”
The measurement is very rapid. The SLS sensor repeats the measurement
sequence 16000 times per second. This makes it possible to measure moving and
vibrating objects.
By using several SLS sensors you can measure thickness, profiles, diameter, etc.

03-09-05 8
The accuracy is high; the error is normally less than 0.2% of the measurement
range.
Sampling frequency and bandwidth.
Sampling frequency and bandwidth are related but not identical quantities. The
sampling frequency tells how often the sensor evaluates the raw analog signal by
performing an A/D conversion. The bandwidth value tells how that analog signal
is conditioned before the A/D conversion. In order to avoid certain signal
processing problems, the bandwidth has to be lower than the sampling frequency
(it may not exceed 50% of the sampling frequency), and for that reason the signal
is put through an analog filter stage before the A/D conversion. Although it is not
a theoretically correct way to express it, one might say that the bandwidth
determines how fast a measurement signal may change, and have the change
detected by the sensor.
The analog position sensitive detector
12
Incoming light
X
Light spot
I1 I2
0
Typical size of the detector is 1*10 mm
Figure 5: The analog position sensitive detector
The detector current, generated by the light spot is divided into two parts: I1 and
I2.
The distances between the light spot and the electrodes 1 and 2 give the ratio
between the currents.
2.1.1.1 Advantages
Advantages:
1 Fast. Rise time 10-90 % (typical) = 0.2 µsec.
2 High suppression of ambient light.
3 Very high resolution. Limited only by the following Analogue-to-Digital
converter.
The technique also enables fast regulation of the output laser power. This fast
regulation makes measurement of almost any material or surface possible and
allows for fast and big variations of measured surfaces color and reflectiveness.