Setting The Measuring / Focus Distance; Manually Focusable Optics; Motorized Focus Optics (Only M3); Manually Focusable Fiber Optic Lenses - KPM PROCESS SENSORS METIS M308 User Manual

METIS M308 / M309 / M313 / M316 / M318 / H309 / H316 / H318 (12-pin)
5.5

Setting the Measuring / Focus Distance

The focus distance is the distance at which the lens has the smallest spot size. In most cases, this distance is
also the required measuring distance.
▪ For fixed focus optics, the focus distance is set to a fixed distance and cannot be changed.
▪ With focusable optics the focus distance can be changed continuously within a predetermined range, so the
smallest possible spot size is always achieved.

5.5.1 Manually Focusable Optics

▪ Release optics turn counterclockwise
▪ Move optics in or out until the measured distance is found (see
Alignment onto the measuring object or via the optics pull-out in the spot
size tables, section 5.6).
- Pulled optics: short measuring distance
- Inserted optics: long distance measurement
▪ Lock optics turn clockwise (hand-screwed, without tools).

5.5.2 Motorized Focus Optics (only M3)

▪ Set the measuring distance with the arrow push buttons
set distance is displayed on the device display for a few seconds, then it will
return to the measurement temperature.
▪ With PC connection the distance also can be set via software (see 7,
SensorTools Software).

5.5.3 Manually Focusable Fiber Optic Lenses

Optics OL25: Just slightly open the lens locking ring for releasing
and locking the optics, as rear optics part rotates with opening of the
locking ring.
Optics OL12: Optics lock screw (allen screw) for releasing and lock-
ing the optics.
Pull the rear optics part out of the tube to focus according to the re-
quired measuring distance (laser beam is focused and has the small-
est diameter).
|NOTICE|
Beware of tearing the optical fiber.
Never pull on the flexible part of the optical fiber to focus!

5.5.4 Fixed Focus Optics (only M3)

Fixed focus optics are set to a fixed measuring distance. To measure with the small-
est possible spot size, the pyrometer must be installed in the specified distance to
object. Additionally the built-in laser targeting light or view finder helps aligning the
pyrometer to the target exactly.
1. Release
2. Adjust
5.4
3. Lock
1
on the device, the
Lens locking ring
Rear optics part
Resistant part of
the optical fiber
Flexible part of the
optical fiber
Optics lock screw
2
3
Tube
Focus ad-
justment
21