LumaSense Technologies IS 12-TSP - Handbuch (Seite 11)

IMPAC pyrometers IS 12-TSP · IGA 12-TSP
11
The following points must also be observed in the special case of the TSP device:
5.1.1 Special aligning notes
 The size of the spot size is determined first and foremost by the distance of the pyrometer from the ra-
diator in addition to the optical equipment fitted to the pyrometer (see measure field table in 7, Optics).
 The pyrometer’s spot size should be selected so that the temperature is only received from the floor of
the radiator opening, since the emissivity is normally high and homogenous in this location but normally
declines along the wall and towards the opening.
 The pyrometer should not be positioned so close to the radiator that it is heated by this to above its
maximum permissible ambient temperature.
 If the selected pyrometer measured field is very small, the temperature display can change due to possi-
ble non-homogenous radiator surfaces when aligning the pyrometer (this is especially noticed on
radiators of not particularly high quality).
 In typical cases, the optical focus point is adjusted at the height of the radiator front. To achieve a smal-
ler or larger measured field, the focus point can be adjusted in front or behind this location.
Notes: IMPAC transfer standard pyrometers are fitted with an extremely good optical system
which only receives the minimum radiation quantities outside the measured beam.
For this reason it is not necessary to put an additional aperture in the course of the
beam during measurement which limits the received radiation. This should be taken
into consideration especially for comparative measurements with other pyrometer
types since a high proportion of unwanted additional radiation can be received under
certain conditions depending on the optical system fitted if no aperture is fitted during
measurement.
5.1.2 Instrument settings
 The pyrometer has been set to an emissivity of 1 ex works. All calibration sources which have been cali-
brated with an effective emissivity of 1 will be checked with this setting. In case that the calibration
source has to be checked with its true emissivity, the corresponding value can be set at the pyrometer
(see 8, Instrument settings).
 The exposure time is set to 1 sec ex works. This is the standard setting for TS pyrometers which is
achieved with maximum precision at minimum noise values. Changing this setting is only necessary if
the pyrometer is to be used for other measuring tasks.
6 Sighting
For exact aiming to the object the pyrometers are equipped with a thru-lens view finder and an additional
laser targeting light (exception: the IS 12-TSP with temperature range 850 to 2520°C has only a view finder).
6.1 Thru-lens view finder
In the optimized thru-lens view finder a circle marks the exact position and
size of the measuring spot. The focusable optics is correctly adjusted to the
required distance, if the measuring object is shown as a sharp image in the
view finder (adjusting the measuring distance see 7, Optics).
Pyrometers with temperature ranges exceeding 1500°C are equipped with
an adjustable eye protection filter. Turning the ocular changes the filter from
bright to dark.
Radiator front
Measured distance
Optics
Course of radiation
Eye
protection
filter