Transmittance Probes
- Ideal for Absorbance and Transmittance Measurements of Liquid Samples
- Great Solution for Real Time Reaction Monitoring
- Available in Pathlengths of 2, 5, and 10 mm
- Probe and Jacket in Stainless Steel for Maximum Resistanc
Transmittance immersion probes are coupled to our spectrometers and light sources for UV-Vis and Vis-NIR absorbance and transmittance measurements in solutions. Built using two optical fibers, one for illumination and the other for collection, transmittance dip probes are perfect for setups where you need to embed or permanently set the probe tip into a reaction vessel for real-time sample monitoring. Light is transmitted from the illumination fiber through the sample onto a surface mirror at the tip of the probe
where it is reflected and focused onto the collecting fiber within the probe ferrule. The configuration of a transmittance dip probe requires selecting the wavelength range and core diameter. The probe and jacket are made of stainless steel for maximum robustness and durability. Pathlengths of 2, 5, and 10-mm are available by just changing the tip of the probe. Optionally, Sarspec can offer an adjustable tip that allows the user to set manually the optical path length.
Setup Examples
Absorbance and Transmittance Measurements

Technical Data
UV-Visible-NIR
Visible-NIR
Core material
Pure Fused Silica
Pure Fused Silica
Cladding
Fluorine Doped Silica
Fluorine Doped Silica
Wavelength Range
180-1200 nm
300-2400 nm
Solarized-resistance
Yes (optional)
No
Core diameters
Select from 200, 400 and 600 µm
Select from 200, 400 and 600 µm
Probe tip length
100 mm
100 mm
Probe tip diameter
6.35 mm
6.35 mm
Probe tip material
Stainless Steel
Stainless Steel
Fiber Jacket
Stainless Steel
Stainless Steel
Connector
SMA 905
SMA 905
Temperature range
Up to 90ºC
Up to 90ºC