INFRATHERM
pyrometer IS 50-LO/GL
18
6.2 Converter
To fix the converter, 2 drill holes for screws
with 4 mm diameter are to reach after remov-
ing the cover.
For fixing the optical head different mounting
supports are available (see
6.5 Accessories
(option)
).
Drill holes
Cover
6.3
Fibre / optical head
The infrared radiation is transmitted from the optics to
the signal processor through a fibre optic cable. The
optical head contains only the objective lens, the signal
processor contains the radiation detector and signal
processing circuitry. The transmission through the fibre
optic cable is based on
the principal of the
total reflec-
tion by boundary surfaces
of the glass fibres
(see
diagram). The transmission is therefore almost totally
lossless.
Entering
radiation
Impermeable protective coat
Reflective coating
Glass fibres
The fibre has a green mark for correct connection to
the pyrometer. This color mark has to be mounted on
the pyrometer’s side. On side of the optical head no
mark or a black mark is viewable.
The fibre optic connectors are equipped with a special
sealing ring to protect the connection against penetra-
tion of liquids.
Attention:
The light guide end of the fibre
optic cable as well as the socket/connector
and the optical head must always be protected
with the caps when not connected!
Fibre
Screw connection
Green mark
Converter
Sealing ring
Note:
When connecting or disconnecting the fibre, check the sealing ring to ensure the tightness
against liquids.
6.3.1. Ambient
temperature
Fibre and optical head can withstand ambient temperatures up to 250°C without cooling on optical head’s side.
6.3.2. Serial
number
The original fibre has a serial number which is also on the con-
verter’s housing.
Attention:
Faultless operation of the IS 50-LO/GL is
ensured only when using components with the same
serial number (this is especially important when install-
ing several IS 50-LO/GL pyrometers).
The system must be re-calibrated if the fibre optic cable
or the optical head are exchanged (service)!
Serial number
6.4
Minimum bending radius
momentary, localized (max. 250 °C):
30 mm
long-term (max. 250 °C):
50 mm
in coiled condition (max. 50 °C):
50 mm
Note:
A hot fibre optic cable should not be exposed to continual movement!
