Use Precautions
● EN60825-1
Requirements;
Sub-clause
Classification
Class 3A
Class 1
Not required
Class 2
Class 3B*
Class 4
Remote interlock
Key control
Connect to room or door circuits
Remove key when not in use
Not required
Not required
Beam attenuator
When in use prevents inadvertent exposure
Indicates laser is energized
Emission indicator de- Not required
vice
Warning signs
Beam path
Not required
Follow precautions on warning signs
Not required
Terminate beam at end of useful length
Specular reflection
Eye protection
No requirements
No requirements
Prevent unintentional reflections
Required if engineering and administrative procedures not practicable
and MPE exceeded
Protective clothing
Training
No requirements
No requirements
Sometimes required
Specific requirements
Required for all operator and maintenance personnel
*With respect to the requirements of remote interlock connector, key control, beam attenuator, and emission indicator, Class 3B laser products not
exceeding five times the AEL of Class 2 in the wavelength range of 400 nm to 700 nm are to be treated as Class 3A laser products.
Note: This table is intended to provide a convenient summary of requirements. See text of this standard for complete precautions.
● ANSI Z136.1:1993 “American National Standard for the Safe Use of Lasers”
Control Measures for the Four Laser Classes
Control measures
Engineering Controls
Classification
1
2a
X
2
3a
X
3b
X
4
Protective Housing (4.3.1)
X
X
X
Without Protective Housing (4.3.1.1)
Interlocks on Protective Housing (4.3.2)
Service Access Panel (4.3.3)
Key Control (4.3.4)
LSO (see note 2) shall establish Alternate Controls
✩
✩
✩
✩
X
X
✩
✩
✩
✩
X
X
---
---
---
---
•
X
Viewing Portals (4.3.5.1)
---
---
MPE
MPE
---
MPE
MPE
---
MPE
MPE
MPE
MPE
Collecting Optics (4.3.5.2)
MPE
---
MPE
---
Totally Open Beam Path (4.3.6.1)
X
X
NHZ
NHZ
Limited Open Beam Path (4.3.6.2)
---
---
---
---
X
NHZ
X
NHZ
Enclosed Beam Path (4.3.6.3)
Remote Interlock Connector (4.3.7)
Beam Stop or Attenuator (4.3.8)
Activation Warning Systems (4.3.9)
Emission Delay (4.3.9.1)
None is required if 4.3.1 and 4.3.2 fulfilled
---
---
---
---
---
---
---
---
---
---
---
---
---
---
---
---
---
---
---
---
•
X
X
X
X
•
•
---
Indoor Laser Controlled Area (4.3.10)
X
X
NHZ
NHZ
Class 3b Laser Controlled Area (4.3.10.1)
Class 4 Laser Controlled Area (4.3.10.2)
Laser Outdoor Controls (4.3.11)
---
---
---
---
---
---
---
---
---
---
---
---
X
---
X
---
X
NHZ
X
NHZ
Laser in Navigable Airspace (4.3.11.2)
Temporary Laser Controlled Area (4.3.12)
---
---
---
•
•
•
✩
MPE
✩
MPE
✩
MPE
✩
MPE
---
---
Remote Firing & Monitoring (4.3.13)
Labels (4.3.14 and 4.7)
---
X
---
X
---
X
---
X
•
---
X
•
X
Area Posting (4.3.15)
---
---
---
X
X
NHZ
NHZ
Administrative & Procedural Controls
Standard Operating Procedures (4.4.1)
Output Emission Limitations (4.4.2)
Education and Training (4.4.3)
Authorized Personnel (4.4.4)
1
2a
---
---
---
---
---
2
3a
---
3b
•
4
---
---
---
---
---
---
---
•
X
LSO Determination
•
X
X
X
X
X
X
---
X
---
X
Alignment Procedures (4.4.5)
20
ZX Series (ZX-L-N) Smart Sensors (Laser Type)