ISR 12-LO/GS Manual
Controls and Installation
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21
3.6
Aligning the optical head to the pouring stream
The optical head must be aligned in that way that the spot is partially filled by the pouring
stream. If the pouring stream is moving, the stream should not leave the spot.
For a correct measurement of a pouring stream it is necessary that the
measuring signal has a certain minimum level of 10 to 20% (i.e. the size of the
pouring stream and the spot size must have a certain relation). The signal level is
displayed in the software InfraWin in the window “color bar”, be sure the emissivity
slope is adjusted correctly (see
4.5
). If the signal is too low at the required measuring
distance, the spot also can be adjusted diagonal to the pouring stream to increase the
signal strength, but regard not to touch the “beard” at the top or the form edge.
3.7
Aligning the optical head with help of the laser
targeting light
For correct alignment of the optical head the built-in laser targeting light must be used. The
laser creates a line spot in the dimensions of the measuring spot. The size of this line varies for
the different measuring distances. As the alignment of the optical head is quite difficult during
the pouring process it is recommended to do it before the process starts. This can be done with a
white sheet of paper which is hold at the position of the pouring stream. The laser line can be
easily recognized on the paper for an accurate alignment.
If the laser targeting light is switched on, the display is blinking with the value “8000”, the
analog output keeps the last measurement value.
The laser targeting light can be switched on and off either by pressing the button at the
housing or by using an external contact (see
Pin assignment for the connector on the
bottom side of the pyrometer
) or via PC and the software InfraWin. After two minutes the
laser targeting light is switched off automatically.
Warning:
To reduce the risk of injury to the eyes, do not look
directly into the targeting laser and do not point the targeting laser
into anyone's eyes. The instrument is equipped with a class II laser
that emits radiation.
Note:
To prevent the damage of the laser, the pilot light switches off automatically if
the internal temperature of the device exceeds approx. 55 °C (it can switched-on again
if the internal temperature is lower than 55 °C)!
