Campbell-scientific CS547 Conductivity and Temperature Probe and A547 Instrukcja Użytkownika Pobierz pdf (Strona 11)

CS547 Conductivity and Temperature Probe and A547 Interface

19: Z=X*F (P37)

1: 5 X Loc [ Rp ]

2: -.1 F

3: 5 Z Loc [ Rp ]

20: Z=X+F (P34)

1: 5 X Loc [ Rp ]

2: -.005 F

3: 5 Z Loc [ Rp ]

21: Z=X+Y (P33)

1: 1 X Loc [ Rs ]

2: 5 Y Loc [ Rp ]

3: 1 Z Loc [ Rs ]

;

;EC is then calculated by multiplying the reciprocal of resistance,

;which is conductance, by the cell constant.

;

NOTE: The cell constant (Kc) is printed on the label of each sensor or it can be calculated

(see Section 6.4). It is entered in place of nnn below.

22: Z=1/X (P42)

1: 1 X Loc [ Rs ]

2: 2 Z Loc [ l_over_Rs ]

23: Z=X*F (P37)

1: 2 X Loc [ l_over_Rs ]

2: nnn F Enter cell constant.

3: 3 Z Loc [ Ct ]

(cont.)

Temperature: Temperature is measured with a single instruction, P11, that

measures the thermistor resistance and calculates temperature. Output is °C

when a multiplier of 1 and an offset of 0 is used. See Section 10 of datalogger

manual for detailed information on the function of Instruction P11.

24: Temp (107) (P11)

1: 1 Reps

2: 3 SE Channel

3: 2 Excite all reps w/E2

4: 4 Loc [ Temp_degC ]

5: 1.0 Mult

6: 0.0 Offset

(cont.)

5.3 Correction of Ionization Errors in EC Measurement

Ionization caused by the excitation of the EC sensor can cause large errors.

Campbell Scientific has developed a linear correction for conductivity between

0.005 and 0.44 mS cm

-1

, and a quadratic correction for conductivity between

0.44 and 7.0 mS cm

-1

. Corrections were determined in standard salt solutions

containing KCl, Na

, NaHCO

, and NaCl.

1 2 ... 6 7 8 9 10 11 12 13 14 15 16 ... 25 26

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