Campbell OBS-3A Especificaciones descargar pdf (Pagina 40)

Section 6. Calibration

Where:

std

= Turbidity of the standard solution;

stk

= Turbidity of the stock solution, usually 4000 NTU;

stk

= Cumulative volume of stock solution at each calibration point;

= Initial volume.

TABLE 6.1-1. Mixing Volumes for Formazin

Standards

Formazin Volume

stk

(ml)

Solution Turbidity

std

(NTU)

12.7 50

32.3 125

66.7 250

143 500

333 1000

1000 2000

6.2 Sediment

The procedure for sediment calibration is more involved than for turbidity. For

a modest charge we will pre-calibrate OBS sensors with sediment provided by

users. Call us for a quotation to perform this service.

The most common cause of errors in OBS data is improper

calibration.

CAUTION

Before proceeding with a sediment calibration, review Section 8 to learn about

factors that can influence the quality of your results. The most difficult part of

the procedure is maintaining a stable sediment concentration while the OBS

logs calibration values. This is straightforward when the material is dry,

completely disaggregated mud with particles smaller than ~20m. It becomes

more difficult the larger the sediment gets and special calibration equipment

may become necessary (see Section 9—References).

6.2.1 Equipment and Materials

x Dry, completely disaggregated bottom sediment or suspended matter from

the monitoring site,

x 1-gallon (4 l) brown Nalgene polypropylene bottle with top cut off,

x 1-liter, Class A volumetric flask,

6-4

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