Data Acquisition; Setting The Gain - Valeport Hyperion Chlorophyll a Operating Manual

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Section 3 | Data Acquisition

3 Data Acquisition

Hyperion optical sensors are designed for both static monitoring and profiling operations either as

a standalone instrument or as part of a profiling multi sensor instrument.

The optical sensor should be mounted with the window on the front face of the instrument and

therefore, the beam of excitation light directed into the water body to be analysed. During the

synchronised observation period ambient light is measured while the Hyperion LED is off and

again when the LED is on in order to cancel out the ambient light effects.

If very high ambient light levels are encountered, e.g. bright sunlight, in shallow water where there

is a light coloured \ reflective bottom, the receiver may become saturated and return negative

number results. If this happens some form of shading will be required and the sensor not mounted

so it points directly at the bottom.

Valeport can provide an Ambient Light Shield (0901SA7). Please contact Valeport for details.

Prior to November 2020 (Serial No: 75100) a Hyperion was set to the default range, for its specific

analyte, before leaving Valeport. After November 2020 MK2 PCBs were installed in all Hyperions

and that removed the need to set the gain. If you have bought your Hyperion after November 2020

you can ignore this section.

The default range for any analyte will be its low range and, therefore, the instrument will be set to

maximum sensitively and gain. This will allow the measurement of low concentrations of the

analyte. Within this range there will be a linear response over 3 orders of magnitude

For Example:

in the case of Chlorophyll, the default range is: 0.025 µg/l (MDL) to 25.0 µg/l (FSD)

In the case of Fluorescein, the default range is: 0.01 ppb (MDL) to 25 ppb (FSD)

If high fluorophore concentrations are encountered, the range should be set to the non-default

setting to allow a linear response over a far wider range.

The gain can be set as part of the set-up wizard in DataLog x2:

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