SeaStripe Laser Line Projector (MKIII) Operator & Installation Manual
Contents
1. Tritech International Ltd Peregrine Road Westhill Business Park Westhill Aberdeen AB32 6JL UK Telephone 444 0 1224 744111 Fax 4444 0 1224 741771 Email support tritech co uk Web www tritech co uk An out of hours emergency number is available by calling the above telephone number If you have cause to use our Technical Support service please ensure that you have the following details at hand prior to calling e System Serial Number if applicable e Fault Description e Any remedial action implemented Due to the expansion of equipment capabilities and the fact that new sub modules are continually being introduced this manual cannot detail every aspect of the operation Issue 0 TIL Eng Spec 097 Page 8 of 23 SECTION 1 SAFETY Lasers irrespective of classification should always be treated as though they have the potential to damage eyesight Laser beams are generally not very divergent and so can pose a risk even at great distances from the source DANGER Damage to eyesight does not necessarily cause pain The operator has to make sure that the manual has been fully understood and ensure that a risk analysis and appropriate precautions and procedures have been taken to ensure safe operation of the equipment The operating instructions must always be available where the equipment is used and a place designated for keeping them If a fault develops the equipm2. SeaStripe laser CLASS 1 This class is eye safe under all operating conditions CLASS 1M This class is safe for viewing directly with the naked eye but may be hazardous to view with the aid of optical instruments In general the use of magnifying glasses increases the hazard from a widely diverging beam eg LEDs and bare laser diodes and binoculars or telescopes increase the hazard from a wide collimated beam such as those used in open beam telecommunications systems Radiation in classes 1 and 1M can be visible invisible or both CLASS 2 These are visible lasers This class is safe for accidental viewing under all operating conditions However it may not be safe for a person who deliberately stares into the laser beam for longer than 0 25 s by overcoming their natural aversion response to the very bright light CLASS 2M These are visible lasers This class is safe for accidental viewing with the naked eye as long as the natural aversion response is not overcome as with CLASS 2 but may be hazardous even for accidental viewing when viewed with the aid of optical instruments as with CLASS 1M Radiation in CLASSES 2 and 2M is visible but can also contain an invisible element subject to certain conditions CLASSES 1M and 2M broadly replace the old CLASS 3A under IEC and EN classification Prior to the 2001 amendment there were also lasers which were CLASS 3B but were eye safe when viewed without optical instruments These la
3. of 23 SECTION 5 OPERATION 5 1 OPERATION OF EQUIPMENT Before switching the laser on ensure that all necessary safety measures DANGER have been taken The operating organisation must appoint and oversee those responsible for assembly installation and operation of the equipment Operations that may negatively influence the safety of the equipment must be avoided Regulations that govern laser operation must be fully observed Changes to the equipment may NOT be made since this could affect the safety classification of the laser The Tritech Laser Line Projector is suitable for intermittent operation and for 24 hour continuous duty 5 2 OPTICS The laser optics must not be adjusted or removed from their housing DANGER Any changes to the operation of the laser and its surrounding environment that affect the optical characteristics of the laser must have a risk DANGER assessment carried out before further operations are carried out Issue 0 TIL Eng Spec 097 Page 21 of 23 SECTION 6 MAINTENANCE If for any reason the laser housing pod view port protective shield is damaged or altered or the laser is dismantled then it must be treated as CLASS 3B All the relevant safety precautions must be observed in accordance with the current issue of EN 60825 1 DANGER 6 1 ROUTINE MAINTENANCE The Tritech Laser Line Projector is essentially maintenance free all that is necessary
4. International Limited SeaStripe Laser Line Projector MKIII Operator amp Installation Manual The electronic version of this document is the controlled copy Therefore all printed versions of this document are uncontrolled For the latest manual revision always visit www tritech co uk Issue 0 TIL Eng Spec 097 SeaStripe Laser Line Projector MKIII OIM safety information which must be read prior to use of the product COPYRIGHT Tritech International Ltd The copyright in this document is the property of Tritech International Limited The document is supplied by Tritech International Limited on the understanding that it may not be copied used or disclosed to others except as authorised in writing by Tritech International Limited Tritech International Limited reserved the right to change modify and update designs and specifications as part of their ongoing product development programme F063 1 Tritech International Ltd SeaStripe Laser Line Projector MKIII OIM Table of Contents Handling of Electrostatic Sensitive Devices cccccesssseeeeeeeeeeeeeeeeeeeeeeeeees 5 Warranty Statement namasa 6 Waste Electrical and Electronic Equipment Directive 2002 96 EC WEEE 7 Safety Statements amp CE marking ss eeeeceeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeseneees 7 Technical Support papalakpak ankas mahanap nnnm nnnnnnnnnn nnmnnn nne 8 SECHON 1 Sale TE AT 9 1 1 La
5. anssvecesseasersssdesasaasaseixsusussucnasunden 22 6 2 QD AIM P TA T TEE 22 6 3 Fault DiagnasiBu maa AGING ASAN 23 Issue 0 TIL Eng Spec 097 Page 4 of 23 Tritech International Ltd SeaStripe Laser Line Projector MKIII OIM Handling of Electrostatic Sensitive Devices ATTENTION Observe Precautions For Handling Electrostatic Sensitive Devices Caution Certain semiconductor devices used in the equipment are liable to damage due to static voltages Observe the following precautions when handling these devices in their unterminated state or sub units containing these devices e Persons removing sub units from any equipment using electrostatic sensitive devices must be earthed by a wrist strap via a 1MQ resistor to a suitable discharge reference point within the equipment Soldering irons used during any repairs must be low voltage types with earthed tips and isolated from the Mains voltage by a double insulated transformer Care should be taken soldering any point that may have a charge stored Outer clothing worn must be unable to generate static charges Printed Circuit Boards PCBs fitted with electrostatic sensitive devices must be stored and transported in appropriate anti static bags containers Issue 0 TIL Eng Spec 097 Page 5 of 23 Tritech International Ltd SeaStripe Laser Line Projector MKIII OIM WARRANTY STATEMENT Tritech International Limited herein after referred to as TIL TIL warrants that
6. at the time of shipment all products shall be free from defects in material and workmanship and suitable for the purpose specified in the product literature The unit system warranty commences immediately from the date of customer acceptance and runs for a period of 365 days Customer acceptance will always be deemed to have occurred within 72 hours of delivery Note Any customer acceptance testing if applicable must be performed at either TIL premises or at one of their approved distributors unless mutually agreed in writing prior to despatch Conditions These include but are not limited to the following 1 The warranty is only deemed to be valid if the equipment was sold through TIL or one of its approved distributors The equipment must have been installed and commissioned in strict accordance with approved technical standards and specifications and for the purpose that the system was designed The warranty is not transferable except or as applies to Purchaser first then to client TIL must be notified immediately in writing of any suspected defect and if advised by TIL the equipment subject to the defect shall be returned by the customer to TIL via a suitable mode of transportation and shall be freight paid The warranty does not apply to defects that have been caused by failure to follow the recommended installation or maintenance procedures Or defects resulting from normal wear amp tear incorrect operation fire water in
7. be billed to the customer and an estimate submitted for customer approval before the commencement of repairs Issue 0 TIL Eng Spec 097 Page 6 of 23 Tritech International Ltd SeaStripe Laser Line Projector MKIII OIM Waste Electrical and Electronic Equipment Directive 2002 96 EC WEEE Tritech International Limited is very aware of its responsibilities to the environment and to the sustainability of the resources of our planet The European Commission has issued the above Directive in an effort to reduce the impact on the environment due to electronic appliances being committed to landfill after they have come to the end of their useful life When the appliance referred to in this manual is no longer serviceable it MUST NOT be discarded by placing in landfill dumping in the sea or incineration SEPARATE collection is mandatory The owner of the appliance should either return it and its associated leads amp accessories if appropriate to Tritech International Limited with a certificate of decontamination we reserve the right to protect our staff from the effects of any contamination or sent to an appropriate treatment or recycling agency Any goods manufactured after 13 August 2005 that fall within the scope of v the WEEE Directive are marked as shown opposite and will have the pS manufacturer s identification marks and optionally the date of manufacture H o SAFETY STATEMENTS amp CE MARKING The installa
8. ech for repair Laser Beam Split No laser beam visible Laser diode damaged by unstable power supply or ESD Return to Tritech for repair 1 Check power cable is DO NOT LOOK DIRECTLY INTO BEAM PATH WHETHER OR NOT A BEAM IS PRESENT Unstable power supply connected and not loose 2 Check input supply to laser 3 If the internal supply overload protection has tripped out allow to cool and switch the unit back on 4 If the unit is still not operating return to Tritech for repair power Issue 0 TIL Eng Spec 097 Page 23 of 23
9. ent must be switched off immediately NEVER USE MAGNIFYING OPTICS TO VIEW THE LASER BEAM 1 1 LASER HANDLING SAFETY PRECAUTIONS The SeaStripe Laser Line Projector contains a 20mW CLASS 3B laser It should not be used in a dismantled condition or with the protective cowl A removed or if damaged in any way As packaged with the cowl in place and in an undamaged condition the risk of exposure is reduced to CLASS 3R All mandatory precautions and procedures relevant to that class of laser must be followed Before operating in air the port should always be dried off DANGER The SeaStripe Laser Line Projector is only to be used by personnel qualified and authorised to handle laser devices DANGER The operator is to instruct every person who uses the device or who is working near the laser on the dangers of laser beams and on the responsible use of lasers It is recommended that this instruction be repeated at least once a year expose any personnel or any sensitive equipment to the laser beam It must NOT be used in the vicinity of divers NEVER point the laser at aircraft or other vehicles When lasers are in use the danger is not always obvious For reasons of safety the people who are working with or nearby a laser have to be informed DANGER about the dangers of laser beams DANGER When using the laser in the subsea environment care must be taken not to DANGER Issue 0 TIL En
10. g Spec 097 Page 9 of 23 A The working area in which the laser is installed must be marked as required DANGER by law to prevent accidental injury to third parties A It is prohibited to place a mirror or other optical device in the path of the laser beam this can ngerous reflections DANGER laser bea this can cause dangerous reflections A yellow warning label attached to the device denotes the class of laser Never remove this label It denotes the safety class and hence the measures DANGER that have to be observed when handling and using the laser A Never level or aim the laser beam intentionally at people DANGER When working with lasers personnel should have access to safety eyewear which is certified to either EN207 or EN208 for the relevant wavelength s and power Familiarity with the following regulations will help protect you against avoidable injury EN 60825 1 Safety of Laser Products German Equivalent is VDE 0837 EN 207 Eye Protection EN 208 Eye Protection for Laser Alignment Health And Safety At Work Act 1974 ANSI 2136 1 Standard for the safe use of lasers IEC 825 1 Safety of laser products Part 1 Equipment classification requirements and users guide PD IEC TR 60825 14 2004 Users guide Issue 0 TIL Eng Spec 097 Page 10 of 23 1 2 LASER CATEGORIES Reference information take particular note of CLASSES 3R and 3B which are particularly relevant to the
11. gress lightning damage or fluctuations in vehicles supply voltages or from any other circumstances that may arise after delivery that is outwith the control of TIL Note The warranty does not apply in the event where a defect has been caused by isolation incompatibilities The warranty does not cover the transportation of personnel and per diem allowances relating to any repair or replacement The warranty does not cover any direct indirect punitive special consequential damages or any damages whatsoever arising out of or connected with misuse of this product Any equipment or parts returned under warranty provisions will be returned to the customer freight prepaid by TIL The warranty shall become invalid if the customer attempts to repair or modify the equipment without appropriate written authority being first received from TIL TIL retains the sole right to accept or reject any warranty claim Each product is carefully examined and checked before it is shipped It should therefore be visually and operationally checked as soon as it is received If it is damaged in anyway a claim should be filed with the courier and TIL notified of the damage Note TIL reserve the right to change specifications at any time without notice and without any obligation to incorporate new features in instruments previously sold Note If the instrument is not covered by warranty or if it is determined that the fault is caused by misuse repair will
12. is to clean the pod housing view port and laser lens optic with a fine water jet and then wipe with a suitably soft cloth at regular intervals but it is advisable to wash down the device with fresh water after each dive When cleaning the laser pod housing view port and laser lens optic ensure that power has been removed Avoid looking directly into the laser and if DANGER practical clean the lens by approaching from the side or the rear 6 2 REPAIR Never try and repair the laser yourself if repair is necessary return the laser to Tritech Issue 0 TIL Eng Spec 097 Page 22 of 23 6 3 FAULT DIAGNOSIS Observe all safety precautions at the start of the chapter There are no user serviceable parts inside the unit and opening the DANGER unit will invalidate the warranty Fault Possible Cause Action Laser beam distorted or out of focus The laser housing pod view port is dirty or has air bubbles in front of it or if viewed in air can have water droplets on the port Unstable or defective Remove power and clean the view port with a non solvent cleaner Check Laser is noisy in operation laser light flickers power supply Poor connections power supply and connections If all power supplies are stable and within limits return to Tritech for repair Change of Line Geometry or Uneven Brightness Optic badly adjusted or defective Return to Trit
13. larity and voltage range Connect the power supply and switch on The unit will draw approximately 90mA from a 24v supply at room temperature and slightly more if colder This version of the Sea Stripe has no warm up time NEVER LOOK INTO THE LASER APERTURE OR BEAM PATH WHETHER THE BEAM IS PRESENT OR DANGER NOT Ensure the laser is operating correctly and beam is present if any faults are present switch off and refer to the fault diagnosis section at the rear of the manual Figure 6 Figure 6 is an example of the laser line projector operating in air The aperture is restricted to about 66 degrees in air Operating the laser in a high operating temperature gt 25 C will AUTONI significantly reduce the lifetime of the device Issue 0 TIL Eng Spec 097 Page 19 of 23 4 3 LASER MOUNTING Apart from the laser itself the most important component is the mounting The design of the mounting must allow for quick and accurate calibration to be carried out thus ensuring the accuracy of the system Be aware that slight movement of the device at the installation site can produce larger deflections of the beam at longer ranges The Tritech Laser Line Projector is protected against vibration however it is recommended that a 3 5mm thick damping element is fitted between the mount and the laser if any strongly vibrating machinery is in close CAUTION proximity Issue 0 TIL Eng Spec 097 Page 20
14. ny Power Requirement 3 75W max 2 8W typ Input Voltages 11 to 28v DC Depth Rating 4000 msw Weight in air 1 7 kg in water 0 90 kg Connectort Tritech S0987 6 pin Pin 3 VDC Pin 4 OVDC This can be significantly reduced at increased operating temperatures e g in air operation t Pin 5 of the connector can be used to modulate the beam digitally Applying a maximum of 5v 2 0v threshold DC with respect to Ov will switch the beam off Input R is 10kQ approximately Depends on water solids content turbidity and ambient lighting 3 2 MECHANICAL DATA WWW TRITECH CO UK PART TI 1001 03 000 n SERIAL 030 2 DEPTH RATING 4000m Typical Body Label Issue 0 TIL Eng Spec 097 Page 15 of 23 3 2 MECHANICAL DATA amp PARTS LIST Issue 0 TIL Eng Spec 097 Page 16 of 23 3 3 ELECTRICAL PLUG FEMALE CONNECTION 6 nA 1 OvDC Yellow 2 No Connection Blue 5 3 3 124v DC Red 4 Ov DC Black 5 TTL Modulation Green lee 6 Chassis Screen Do not allow the modulation input to be used as a separate on off control for the laser Operation with modulation must take into account the unexpected turning on of the laser beam when personnel are present and the possibility DANGER of a failure in the modulation control circuit Tritech Right Angled Connector Tritech Straight Connector It is impe
15. of 7mm which typically corresponds to the dilated pupil of the human eye 1 5 RISK ASSESSMENT IS THE RESPONSIBILITY OF THE USER It is essential that the person s responsible for installation of laser equipment understand the potential hazards associated with using laser equipment and implement such precautions and procedures to ensure the safety of both those who will operate the equipment and any other persons in the vicinity of the equipment The SeaStripe laser contains a CLASS 3B laser which will cause eye damage if any person is directly exposed to it The packaged product with the line generating optic reduces the power density at a distance of 50mm from the front face of the unit to less than 5mW into an aperture of 7mm diameter The cowl on the front of the Seastripe laser prevents a person getting closer to the laser source In this condition the maximum risk of exposure is CLASS 3R In view of this precautions and procedures for normal operation must as a minimum take the CLASS 3R rating into account Points to be included in such analysis should include but are not limited to the following e Ensure that only trained personnel fully conversant with the procedures and precautions that have been decided on are responsible for installing the equipment e Ensure that no untrained personnel operate the system once the laser equipment is installed e Restrict personnel in the area whenever the laser is in use If there is risk of e
16. r these conditions the unit should be immediately taken out of service Issue 0 TIL Eng Spec 097 Page 13 of 23 SECTION 2 SYSTEM DESCRIPTION 2 1 INTRODUCTION The Tritech SeaStripe Laser Line Projector has been designed to operate in the subsea environment and is able to project a laser line up to 5m onto the surface under observation highly dependant on water conditions It uses a CLASS 3B laser to project a green line shaped laser beam 64 beamwidth onto the surface this light can be used as an optical indicator It uses a diode pumped solid state laser and has been designed for projection onto a variety of surfaces It has its own internal integrated power supply unit and can operate with a wide power input of 11 to 28 VDC If mounted vertically onto the vehicle the length of the projection is proportional to the height of the laser above the surface measured from approximately 80mm behind the laser port figure 2 demonstrates this principle of operation for water operation a 64 degrees approximately WIDTH w 1 25 x HEIGHT h Figure 2 Issue 0 TIL Eng Spec 097 Page 14 of 23 SECTION 3 SPECIFICATION 3 1 TECHNICAL DATA Operating Life Approx 5 000 hrs Wavelength 532nm Laser Power 20mW CLASS 3B Working Temp Range 4 C to 30 C Storage Temperature 40 C to 80 C Spread of Beam 64 fan Projection Distance in water Up to 5m Installation Position A
17. rative that the o ring and mating surfaces are checked for cleanliness and lightly greased before installation All four screws are required to be properly tightened The right angled connector can be selected to be in any one of four exit positions This can be set at the factory on request Issue 0 TIL Eng Spec 097 Page 17 of 23 SECTION 4 INSTALLATION 4 1 INSPECTION FOR TRANSPORT DAMAGE Before using the laser for the first time please check the following points a Check that the transit case is undamaged retain transit case in the event of return to Tritech b Check that the laser and the subsea housing show no sign of damage C In the event of damage to the package or defects on the product supplied notify the carrier and Tritech within 24 hours by telephone and followed up in writing within 7 working days d Transport the laser only in its original packing If the optics have been moved maladjusted or refracted the laser has to be classified as a CLASS 3B laser In this case all the safety regulations for lasers CLASS 3B have to be respected and it is recommended that the DANGER laser is removed from service and returned to Tritech for repair 4 2 CONFIGURATION Before switching the laser on complete the safety review complete the risk analysis and preparation of required operational procedures and precautions Ensure that the supply voliage agrees with the required vol
18. ser Handling Safety Precautions anna an nnnwnaanannnanaaannasaaaan 9 1 2 Laser CaleQONeS nA AGA AGA AA NAGANA 11 1 3 Waveleng Mua ANA T NGA 12 1 4 Output Power Power Density nan nannnnaaanannnnaaanannunanaananananaonanan 12 1 5 RISK Assessment is THE responsibility of the user 12 SECTION 2 SYSTEM DESCRIPTION ccccsccsscssssssssseccceeessceseseeeseeeeesesees 14 2 1 a too UCU ON AAP AA AA PA APAN APKA RAP KA PAP BAKA PANAHI 14 SECTION 3 SPECIFICATION 1253 aalapanina naban akaRanan KANAN IKAR NAA AGA KANAN ANAKAN ANA KAW aKaWAG 15 3 1 Technical Datla UGAT BANGAG 15 a2 Mechanical Da Biss sasasissnscesrssadsensneseessestassssnsnusionsssazsasesnssesanusessasiacsvndasseaaes 15 3 2 Mechanical Dala amp Parts LISA iaasa aan 16 3 3 Electrical Plug Female Connection ssss1seecceccsesecnsnnnnrsneessesensnnnnenenees 17 SECTION 4 INSTALLATION manahan anaNAAEAANAAANAAAAA 18 4 1 Inspection For Transport Damage 7 7 0 000musamaananansananununaaaaononan 18 4 2 GANAN Na a ERARE R Arua siR a RERE REE 18 4 3 Laser Mounting anan ABANGAN AAAH 20 SECTION 5 OPERATION L 2auaaadananananaandaaakdnbdaaadanaNANA Kaka daNaHanadaaanaanagaadanadaaaganada 21 5 1 Operation Of Equipment ua 21 5 2 OP ca eee 21 SECTION 6 MAINTENANCE sccsciscsccccccscteteccecscenciewtstenctcsccccctesencucccucccseseecewteeess 22 6 1 Routine MAINMCN ANCE ssccccssssiesessesciseneivessssi
19. sers are CLASS 1M or 2M under the current classification system CLASS 3R Radiation in this class is considered low risk but potentially hazardous The class limit for 3R is 5x the applicable class limit for CLASS 1 for invisible radiation or CLASS 2 for visible radiation Hence continuous wave CW visible lasers emitting between 1 and 5 mW are normally CLASS 3R Visible CLASS 3R is similar to CLASS IIIA in the US regulations CLASS 3B Radiation in this class is very likely to be dangerous The radiation can be a hazard to the eye or skin However viewing of the diffuse reflection is safe CLASS 4 This is the highest class of laser radiation Radiation in this class is very dangerous and viewing of the diffuse reflection may be dangerous CLASS 4 laser beams are capable of setting fire to materials onto which they are projected Issue 0 TIL Eng Spec 097 Page 11 of 23 1 3 WAVELENGTH The Tritech SeaStripe Laser Line Projector is exclusively concerned with visible wavelengths green so that in comparison with infrared lasers a certain degree of protection is provided by the blink reflex and other defence mechanisms This may limit damage due to direct exposure in the event of looking directly into a laser beam 1 4 OUTPUT POWER POWER DENSITY The optical output power power density power per unit area is a key value in classifying the laser and its danger levels Laser power measurements are made using an aperture
20. tage range given in the technical specification CAUTION Ensure that the subsea housing pod retaining rings are secure Decide where the laser is to be mounted if possible use a mounting bracket that is configurable in 3 axes This will allow quick and easy adjustments to be carried out during the commissioning stage Assemble the laser on the vehicle avoid using temporary fixing solutions Long term accurate results depend upon a proper and stable method of attachment to the vehicle Check that the connector supplied has been correctly fitted It employs an o ring which must be in good order clean and free of contaminants The connector must be screwed down using the 4 screws supplied such that the o ring is compressed The power supply must be free of spikes If voltage is expected to fluctuate greater than 10 then measures need to be taken to provide a stable voltage supply The working voltage is not to exceed the limits stated in the specification Operating voltages outside the range can CAUTION damage the operation of the laser Issue 0 TIL Eng Spec 097 Page 18 of 23 Before switching the laser on ensure that all necessary safety measures have been taken DANGER It would be best if the laser beam was arranged to be directed onto a matt black or similar surface safety glasses worn and the minimum number of personnel present Check that the power supply is of the correct po
21. tion of the SeaStripe laser is fully the responsibility of the user It is powered by a CLASS 3B green laser which is NOT inherently eye safe Full consideration has been given to the requirements for CE marking and the relevant safety information is contained within this manual Since the unit is supplied as a subsystem for use on an underwater vehicle its safe use is installation specific actual compliance is the responsibility of the installer It must be operated in accordance with the following instruction manual Failure to follow the recommendations of this manual may lead to safety hazards or equipment failure Throughout the manual certain potential problems or further information relating to the installation maintenance understanding or use of the apparatus will be highlighted to the operator by indications identified by the adjacent symbol and text Throughout the manual certain safety or operational related comments and requirements will be highlighted to the operator by indications identified by the CAUTION adjacent symbol and text Throughout the manual certain safety or operational related comments and requirements that could lead to injury or loss of life will be highlighted by the DANGER adjacent symbol and text Issue 0 TIL Eng Spec 097 Page 7 of 23 Tritech International Ltd SeaStripe Laser Line Projector MKIII OIM Technical Support Contact your local agent or Tritech International Ltd
22. xposure consider the use of protective goggles certified under EN207 or EN208 e Permit only short duration testing in air when all unnecessary personnel are excluded from the area e Fit a dedicated and well annotated master switch to control the laser Consideration should be given to this being a key switch Issue 0 TIL Eng Spec 097 Page 12 of 23 Ensure there are no divers in the vicinity where the laser is to be used Normally only switch the unit on when submerged by more than 5m Ensure that mountings cannot fail so as to change the orientation of the laser this may allow it to point in an unexpected direction Ensure that there are no reflective surfaces that may encroach into the laser beam be particularly careful with manipulators or equipment mounted on pan and tilt units It is also necessary to include risk analysis for failure conditions The worst case single failure mode for the internal control electronics could momentarily raise output power by 25 to 25mW That raises the power density at the distance of the cowl edges where the line is brighter to 3 9mW into a 7mm diameter If a change occurs to the laser beam such as uneven line brightness or distorted geometry then the unit should be treated as reverting to CLASS 3B and should not be used If the cowl is broken then the unit should be treated as a CLASS 3B device in as far as it is possible to access an area of high power density close to the unit Unde
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