Immersion probe 661.686 High Precision in
Spectro-Optics
Hellma. Where precision becomes an art.
Mini Process Probe
with variable
light path
This Hellma Analytics transflexion probe is the smallest O-ring
tightened probe of its kind. This makes it exceedingly robust and
flexible due to removable light path tips – the perfect choice for
process and laboratory.
Variable light
paths due to removable
light path tips with an
anti-twist protection
100% reproducibility
of the light path after
exchanging the light
path tips
Use of FFKM
(perfluorelastomer)
O-rings with increased
chemical resistance
High-quality
transmission due to
intelligent design of all
optical components
Easy-to-handle
design and still very
robust at the same
time
Quartz optics made
of SUPRASIL® 300
www.hellma-analytics.com
High pressure
resistant up to 100 bars
Immersion probe 661.686 High Precision in
Spectro-Optics
Mini Process Probe with variable light path
661.686-UV
Mirror material*
Quartz glass
300
with aluminium reflective layer
Quartz glass SUPRASIL® 300
with aluminium reflective layer
Window material*
Quartz glass SUPRASIL® 300
Quartz glass SUPRASIL® 300
Probe barrel material**
Stainless steel 1.4435 (316L)
Stainless steel 1.4435 (316L)
Probehead seal
Perfluorelastomer FFKM (ASTM 01418)
Perfluorelastomer FFKM (ASTM 01418)
Outer Ø
6 mm
6 mm
Total length (without fibres)
235 mm
235 mm
Max. immersion depth
180 mm
180 mm
Removable tips
Type 665.828
(light path equals to 2 x distance
from mirror to window)
1 mm, 2 mm, 5 mm, 10 mm, 20 mm
Type 665.828
(light path equals to 2 x distance
from mirror to window)
1 mm, 2 mm, 5 mm, 10 mm, 20 mm
Typical Transmission
UV: ca. 40 % in air at 300 nm
NIR: > 50 % in air at 1.500 nm
Max. pressure
100 bar
100 bar
Max. temperature
180 °C
180 °C
Optical fibres***
Built in, not exchangeable
UV / Vis
Length: 1,8 m
240 nm - 1100 nm (41.667cm-1 - 9.090 cm-1)
UV/Vis low solarisation
upon request
Built in, not exchangeable
NIR
Length: 1,8 m
400 nm – 2.300 nm (25.000cm-1 - 4.348 cm-1)
Optical fibre connections
FSMA Type 905
FSMA Type 905
*Sapphire on request
**other materials on request
This new product development
is an Mini ProcessProbe with
interchangeable light path tips.
The tips can be exchanged
quickly and easily to adjust the
light path between 1 mm and
20 mm. After passing through
the solution to be measured,
the light beam is reflected by a
rear-coated mirror and passes
through the solution a second
time.
Hellma GmbH & Co. KG
Klosterrunsstraße 5
79379 Müllheim / Germany
phone + 49 7631 182-0
fax
+ 49 7631 135 46
[email protected]
www.hellma-analytics.com
***other fibre length optional
The measuring principle
Window
Light path
Light beam
Mirror
SUPRASIL® is a registered trademark of Heraeus Quarzglas GmbH & Co. KG
661.686-NIR
SUPRASIL®
181/11/GB Printed in Germany Subject to change without notice
Type