Hellma Fibre Optic Probe-ATR Probe


ATR Probes

ATR means “Attenuated Total Reflection”. Light passing from a material with high refractive index (ATR crystal) to a material with lower refractive index (solution) is normally totally reflected. However, in practise, the light partially enters the solution and can be absorbed. The reflected light is therefore attenuated, causing a measurable reduction in the output signal dependent upon the absorbance of the solution.

ATR probes are suitable for situations involving the direct measurement of strongly absorbing solutions, where standard transmission probes cannot be used. The ATR probe 661.812 uses a 3-bounce sapphire ATR crystal, which is directly immersed into the solution to be measured.
 
Product info 661.812
Catalogue Number
661.812-UV
Prism material
Sapphire
Barrel material
Titanium
Probe head seal
Epoxy glue
Outside Ø
12.5 mm
Total length
205 mm
Max. immersion depth
165 mm
Typ. transmission
approx. 25% in air 300 nm
Max. pressure
6 bar
Max. temperature
150 °C
Fibre-optic cables
Built-in, not exchangeable

UV/Vis–2 m**

240 nm –1100 nm
(41.667 cm-1– 9.100 cm-1)

UV/Vis–low solarisation
on request
Product info 661.820
Catalogue Number
661.820-UV
Prism material
Sapphire
Barrel material
Stainless steel 1.4435 (316 L)
or 2.4602 (Hastelloy® C-22)
Probe head seal
FFPM
Outside Ø
12.7 mm*
Total length
266 mm
Max. immersion depth
200 mm
Typ. transmission
UV/Vis approx. 25% in air 300 nm
Max. pressure
15 bar
Max. temperature
150 °C
Fibre-optic cables
Built-in, not exchangeable

UV/Vis–2 m**

240 nm –1100 nm
(41.667 cm-1– 9.100 cm-1)

UV/Vis–low solarisation
on request