The is for accurate CDOM/FDOM monitoring, try using our CDOM sensor with the Aquaprobe. This sensor is fixed response fluorometer, which provides excitation at 365nm (UV) and detects any resultant fluorescence between 450nm and 520nm.

• Coloured, or chromophoric dissolved organic matter (CDOM), is a naturally occurring dissolved matter that absorbs UV light in water. It’s usually made up of tannins that are released from the breakdown of plant material.
• A fraction of CDOM fluoresces when it absorbs light of a certain spectrum, and is called fluorescent dissolved organic matter, or FDOM.

• Installing the CDOM sensor into an Aquaprobe is a very simple process. Simply unscrew the blanking plug from an appropriate aux socket, apply some silicon grease to the thread of the sensor (grease provided), and screw in the sensor. Full calibration is required after installation.

• A core aim at Aquaread is to make our products easy to use, which is why we have simplified and automated the calibration process as much as possible. The CDOM sensor is calibrated at 2 points. A zero point and a 100µg/l point using Aquaread’s CDOM-CAL solution.

• When taking measurements at a particular site there can occasionally be a difference between measured values with the sensor and laboratory data. These differences are caused by a variety of factors.
• You can apply a multiplier to the data obtained from our sensor in order to make it more closely correlate with lab data for that particular site. To do this we use a grab sample factor. This factor can be calculated by dividing the average grab sample value (measured in the lab) by the average value measured by our CDOM sensor.
• This is a great addition to the software when trying to correlate new data with historic readings from the same site.

• Determination of CDOM in the field using fluorescence measurement techniques will never be as accurate as measurements made in a lab using traditional techniques.
• Factors adversely affecting accuracy include:
  • Interference from compounds which fluoresce at similar wavelengths
  • Differences in the fluorescent response caused by temperature
  • Differences in the fluorescent response caused by ambient light
  • Interference caused by turbidity
• Fluorescence measurement techniques are ideal for researchers who are interested in detecting the presence or absence of a specific substance and measuring relative fluorescence changes that can be used as an indication of increasing or decreasing concentrations.
• Fluorescence measurement techniques are not ideal for quantitative measurement. In order to obtain more accurate results, data obtained with the fluorometer in the field should be post-calibrated with data from standard laboratory analysis of grab samples acquired during the study.
• If grab sample data is available, a Grab Sample Factor (GS Factor) should be calculated and input on the calibration screen in order to improve the accuracy of future readings.

NKE Aquaprobe-2000 Water Monitoring Probe

The NKE Aquaprobe-2000 Water Monitoring Probe is the smaller of our advanced portable multiparameter water monitoring probes. It comes with a range of standard sensors included, it also offers some customisation options that allow you to add even more sensors to the probe. All of our probes are constructed from tough marine grade aluminium that has been hard anodised, making it suitable for use in both fresh and salt waters

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NKE Aquaprobe-5000 Water Monitoring Probe

The NKE Aquaprobe-5000 Water Monitoring Probe is the larger of our advanced portable multiparameter water monitoring probes. It comes with a range of standard sensors included, and much like its smaller counterpart it offers more customisation options that allow you to add extra sensors to the probe. All of our probes are constructed from tough marine grade aluminium that has been hard anodised, making it suitable for use in both fresh and salt waters.

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NKE Aquaprobe-7000 Water Monitoring Probe

The NKE Aquaprobe-7000 Water Monitoring Probe is designed for long term deployment utilising a central cleaning system to keep the fitted sensors clean reducing the effects of bio-fouling common in extended deployments. The probe comes with all of our standard parameters including optical dissolved oxygen, it also features 6 user configurable auxiliary sockets allowing you to add multiple specialist sensors to the probe. The NKE Aquaprobe-7000 Water Monitoring Probe is capable of measuring up to 17 individual parameters at once.

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NKE Aquaprobe-6000 Water Monitoring Probe

The NKE Aquaprobe-6000 Water Monitoring Probe can be used for comprehensive spot monitoring as part of a package or it can be used in permanent deployments thanks to its new, much smaller self cleaning mechanism. It features a diameter of only 58mm (the same size as the AP-5000) making it our smallest self cleaning Aquaprobe to date.

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