Eureka Manta Manual
Page 37 of 67
In late November 2018, Eureka released a new Manta software version that adds several
turbidity features for the hard-core turbidity people. Please see C.6.
D.14 Fluorometers
Eureka’s chlorophyll, rhodamine, blue-green algae, CDOM,
fluoroscein, and crude oil sensors are Turner Designs
fluorometric sensors, with each tuned to the slightly different
wavelengths.
Fluorescence occurs when a molecule absorbs light at one
wavelength and then emits that energy at a different
wavelength. More molecules of analyte produce a higher level of that different-wavelength light.
Fluorometric sensors emit light at a certain wavelength, and look for a very specific, different
wavelength in return. The magnitude of the return light is relatable to the amount of analyte present.
Note that there are two types of blue-green algae sensors – fresh-water and marine.
Note that CDOM, or Colored Dissolved Organic Matter, is also known as fDOM (fluorescent Dissolved
Organic Matter), chromophoric
dissolved organic matter, yellow substance, and gelbstoff.
Note that there are many different types of crude oil, and each has a relatively unique fluorescence
response.
There are several conventional ways to calibrate fluorometers; those are explained in Calibrating Eureka’s
Turner Fluorometers. Eureka also has a new method for “standardizing” fluorometers if you do not use a
conventional calibration method; that is explained in Standardizing Eureka’s Turner Fluorometers. Both
of these documents can be found on Eureka’s Flash Drive and Web page (www.WaterProbes.com).
We use Turner Designs fluorometers because Turner is recognized as the world’s leading
manufacturer of miniature fluorescence sensors.
