The transmission dip probe with variable path length can be used to obtain online and inline absorbance measurements in fluids. The 1/2” Probe has an optical path length, which can be set by the user in a range from 0.5 mm to 20 mm and is therefore extremely versatile for high- or low-absorption fluids. The probe end is simply dipped into the fluid to do the measurements. Via a standard SMA905 connector light is coupled into a fiber bundle, consisting of 6 fibers and carried to the probe end, where it crosses a user-defined physical gap of 0.25-10 mm and reflects against a diffuse white material. The back reflected light returns into a 7th fiber. This fiber transfers the data to the output SMA905 connector, which can be coupled to a spectrometer. At the probe end the read fiber is placed in the middle of the lighting fibers for best efficiency of the probe. Both bundles are led through one piece of flexible stainless steel tubing. In a ferrule they are split and run separated for one meter to reach the SMA905 connectors.
Technical Data
Fibers
6 illumination fibers, 1 detection fiber, all 200 µm, standard 2 meters
Wavelength range
200-800 nm (UV/VIS) or 350-2000 (VIS/NIR)
Connectors
SMA905 connectors (2x)
Optical Path
0.25 - 10 mm physical gap, i.e. an optical path of 0.5-20 mm
Probe end
Stainless steel 316, 140-160 mm long x 12,7 mm (1/2") diameter. Waterproof. Optionally -PK for PEEK or -HY for Hastelloy® C276
Tubing
The optical fibers are protected by a silicon inner tube and a flexible chrome plated brass outer tubing. The tubing also gives stress relief. OD: 5,0 mm. Optionally a waterproof, steel reinforced, silicon tubing can be provided (-MS)
Temperature
-30 ºC to 100 ºC. (-HT version 200°C)
Pressure
Probe head 10 bar @ 25°C
Bending
Minimum bend radius: Short term (few seconds) 20 mm, long term: 120 mm
Ordering Information
FDP-7xx200-2-VAR
Transmission Dip Probe in SS with variable tip length, 2 m length, SMA term.
FDP-TIP-VAR
Replacement Stainless Steel tip for Transmission dip probe with variable tip length
Options
-HT
High Temperature version (up to 200°C)
-PK
PEEK Probe material replaces Stainless Steel
-HY
Hastelloy® C276 Probe material replaces Stainless Steel
Products