Xylem WQ-FDO OPTICAL DISSOLVED OXYGEN TRANSMITTER Instrukcja Użytkownika Pobierz pdf (Strona 11)

Global Water

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Other Calculations:

Salinity:

Salinity is a unitless number but is generally referred to in PSS (Practical Salinity

Scale or PSU (Practical Salinity Units). Salinity can be calculated from

conductivity by the equation:

Salinity = A+(B*R^0.5)+(C*R)+(D*R^1.5)+(E*R^2)+(F*R^2.5)

Where:

A = 0.0120

B = -0.2174

C = 25.3283

D = 13.7714

E = -6.4788

F = 2.5842

R = Measured conductivity in uS / 53087uS

Altitude:

Calculating the barometric pressure based on altitude is not exact. It can vary with

air temperature, temperature lapse rate, and other atmospheric conditions. The

following is a good approximation.

Elevation

Feet

Pressure

mbar

Elevation

Feet

Pressure

mbar

Elevation

Feet

Pressure

mbar

1013

2000

944

4000

878

250

1004

2250

936

4250

870

500

994

2500

926

4500

862

750

985

2750

918

4750

854

1000

977

3000

910

5000

846

1250

969

3250

902

5250

838

1500

960

3500

894

5500

832

1750

952

3750

886

5750

824

a = 1013 - (3.54733E-2*A) + (4.6068714E-7 * A^2)

Where:

a = Atmospheric Pressure in mbar

A = Altitude in feet

1 2 ... 6 7 8 9 10 11 12 13 14 15 16 ... 21 22

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