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P374 System User Manual
3.
3.1
Focussing tool
INFINITY
© Pearpoint Ltd
P374 INTRINSICALLY SAFE FLEXIPROBE
SETTING MANUAL FOCUS
To get the sharpest image from the camera the focus can be adjusted using the
focussing tool that was supplied with the system.
360 degrees anti-clockwise
from infinity is suitable for
1" (25mm) to 2" (50mm) pipes
180 degrees anti-clockwise
from infinity is suitable for
2" (50mm) to 4" (100mm) pipes
It is not imperative that the camera is adjusted for different pipe sizes as the
camera has a certain depth of field. This means that although the camera was
focussed for use in 2" (50mm) pipes the picture is still acceptable in pipe sizes
down to 1" (25mm) and up to 4" (100mm). This method means that in a 1"
(25mm) pipe the camera focuses further down the pipe than usual but the image
is still perfectly acceptable. In a 4" (100mm) pipe the camera will be focussing
nearer the camera than usual but the image will still be acceptable.
In other instances the camera can be focussed to other distances depending on
what it is important to observe. When the camera is adjusted to focus at very
close proximity the effect is that the camera magnifies the scene. This can be
very useful when inspecting surfaces for fractures or oxidisation, the magnified
colour picture shows all defects that are in the visible range.
Before using this tool ensure that the front
sapphire window is clean and there is no dirt in
the lens recess as this may damage the tool or
scratch the window.
The lens must be turned clockwise to focus
FAR and must be turned anti-clockwise to
focus NEAR. A good starting point is to focus
the camera to infinity. To do this point the
camera around the workplace and note if
objects in the distance are sharply in focus, if
they are not point the camera at objects closer
to the camera, if closer objects are in focus then
the lens will need to be rotated in a clockwise
direction, if everything is out of focus then the
lens will need to be rotated in a anti-clockwise
direction.
Once the lens has been focussed to infinity it is
easy to judge where to set the lens, for normal
use the lens will only need to be turned one
half turn anti-clockwise (180 degrees) to
focus in 2" (50mm) to 4" (100mm) pipework.
Another half turn (360 degrees anti-clockwise
from infinity) will focus the camera for use in
1" (25mm) to 2" (50mm) pipework.
Section 3
3-1
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