Gocator Line Profile Sensors: User Manual
Safety and Maintenance • 17
warning indicators, it is important not to mount them in a location that would require human exposure
to the laser emissions. User must ensure that the emission indicator, if supplied by OEM, is visible when
viewed through protective eyewear.
Warning Signs
Laser warning signs must be located in the vicinity of the sensor such that they will be readily observed.
Examples of laser warning signs are as follows:
FDA warning sign example IEC warning sign example
Nominal Ocular Hazard Distance (NOHD)
Nominal Ocular Hazard Distance (NOHD)is the distance from the source at which the intensity or the
energy per surface unit becomes lower than the Maximum Permissible Exposure (MPE) on the cornea
and on the skin.
The laser beam is considered dangerous if the operator is closer to the source than the NOHD.
The following table shows example calculations of the NOHDvalues for each Gocator model and laser
class, assuming continuous operation of the laser. As a configurable device the Gocator, lets you set the
laser exposure (laser on-time) independently of the frame period (total cycle time for data acquisition).
Continuous operation of the laser means that the laser exposure is configured to be identical to the
frame period, which is also referred to as 100% duty cycle. However, in many applications the laser
exposure can be smaller than the frame period (less than 100% duty cycle) thereby reducing the NOHD.
The table therefore shows the worst-case NOHD.
Model Laser Class Model Constant Class IMPE(mW) Class IIMPE(mw) Class INOHD(mm)
Class IINOHD
(mm)
2x20 2M
101 0.39 0.98 259 103
2x30 2M
101 0.39 0.98 259 103
3R
351 0.39 0.98 900 358
3B
2246 0.39 0.98 5759 2292
2x40 2M
101 0.39 0.98 259 103
3R
351 0.39 0.98 900 358
3B
2246 0.39 0.98 5759 2292
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