Transmission dip probes are used for on-line and inline absorbance measurements in fluids. When dipping or permanently mounting the probe end into the fluid, absorbance can be measured.

A standard SMA-905 connector is used to couple light into a fiber bundle, typically consisting of six fibers (other configurations available upon request). The light is transmitted to the probe end, where it crosses the predetermined gap and is then reflected against a diffuse white reflective material back onto the receiving read fiber, which is coupled to a spectrometer on the second leg of the probe.

The read fiber is placed in the center of the illumination fibre bundle to provide the best collection efficiency for the probe. Both bundles are housed in flexible stainless steel jacketing and the probe tip is also made of stainless steel.  At the mid-point of the assembly a ferrule is used to split the fibers into their respective legs (illumination and read) which are terminated in SMA-905 connectors.

Product Information

Fibers 6 illumination fibers, 1 detection fiber, all 200 µm, standard 2 meters
Wavelength range 200-2500 nm (UV/VIS/NIR)
Connectors SMA-905 connectors (2x)
Tips Replacement tips are available with 1, 2.5 and 5 mm spacing, i.e. an optical path of 2,5 and 10 mm and contain a 5 mm diam. x 1 mm thick fused silica window
Probe end Stainless steel 316 cylinder, 100 mm long x 8,0 mm diameter, waterproof
Jacketing The optical fibers are protected by a silicon inner tube and a flexible stainless steel (optional BX, O.D. 6.0 mm) or chrome plated brass (standard ME, 5.0 mm) outer jacket. The jacketing also provides stress relief
Temperature -30°C to 100°C. (-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
FDP-7UVIR200-2-yy Transmission dip probe, yy (1, 2.5, 5 mm) gap, 2 m length, SMA term
FDP-TIP-yy Replacement tips, 1 mm, 2.5 mm, 5 mm gap for proben(fill in gap length for yy, note optical path =2*yy)
-BX Stainless steel jacket
-HT High-temperature version (up to 200°C)