Siemens 7MC3040-..., Operating Manual, Page: 21 / 116

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Operating manual PA
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The pyrometer’s optical path must remain unobstructed. Any interference
or obstacle may lead to measurement errors.
6.2 Pyrometer Alignment to Target
For accurate temperature measurement, it is essential that the py-
rometer is correctly aimed and focused at the target object. Make
sure that the optical path is not obscured because this would most
likely impair accuracy.
When aiming the pyrometer with through-the-lens sighting to a target,
both the targeted object and the target marker (distinctly marked circled
spot in the viewfinder) must appear in sharp focus simultaneously. The
measured object must completely fill the target circle in the viewfinder.
A variable polarising filter is available to provide eye protection. This ac-
cessory can be screwed to the ocular lens to provide adjustable bright-
ness control.
If the actual target spot is the same size as the minimum spot size re-
quired by the distance-to-target ratio, or only marginally larger, then we
recommend that you check the maximum output current to verify proper
focussing.
6.3 Pyrometers with laser sighting
The pyrometer models PA xx AF xx /L feature a laser spot light which
can be activated to facilitate instrument alignment to the target spot.
Under normal operating conditions the laser will be off. To activate the
laser, press the MODE button on the rear panel for 2 seconds. . Alterna-
tively, the laser can be switch on via switching input or PC. The laser will
automatically deactivate after 1- 15 minutes.
The pyrometer should be aimed and focused in such a way that
—at the
proper distance to the target object
—the laser beam produces razor-
sharp round dot to indicate the exact measurement spot.
For pyrometers featuring an integrated laser spot light, the light
may, when activated, influence the instrument’s temperature read-
ing. This influence will vary, depending on the instrument model
and the temperature.