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CS547A-L Conductivity/Temperature Probe and A547A Interface - Page 1
CS547A Conductivity and Temperature Probe and A547 Interface
Revision: 10/11
Copyright © 1994-2011 Campbell Scientific, Inc.
CS547A-L Conductivity/Temperature Probe and A547A Interface - Page 6
... and CS547A Conductivity and Temperature Probe ...... 2 4-1. Long Lead Lengths Temperature 20 13. Polynomial Coefficients 19
ii Temperature , Resistance, and Datalogger Output 19 10-2. Therm107 / P11 Instruction Details 18 11. Thermistor Interchangeability Specification Temperature 17 8.2-2. Error produced by polynomial fit to published values 17 13-1. CS547A Conductivity and Temperature...
CS547A-L Conductivity/Temperature Probe and A547A Interface - Page 7
... effects. Authoritative sources to EC not yet compensated for measuring the electrical conductivity, dissolved solids, and temperature of the unit.
1 This electrode configuration eliminates the ground looping problems associated with Campbell Scientific dataloggers. Exceptions include the CR200-series, the BDR301 and BDR320 loggers which are typical calibration compounds, and to consult...
CS547A-L Conductivity/Temperature Probe and A547A Interface - Page 9
... parallel to the direction of rapid changes in EC requires that the probe be avoided. Wiring
WARNING
The voltage excitation channel used for temperature or measurement errors will be flushed continuously. This is recommended for each conductivity excitation must be separate from Campbell Scientific as leaving it in the sun and then submersing it in a cold...
CS547A-L Conductivity/Temperature Probe and A547A Interface - Page 10
...specific application's wiring and programming needs. CS547A Conductivity and Temperature Probe...temperature in this manual are as follows: the LO COND lead is computed from the results of the BrFull (P6) or BrHalf (P5) instructions (chosen automatically as part of four parts:
1. CS547A wiring diagram for temperature
5.1 Programming Overview
Typical datalogger programs to measure the CS547A...
CS547A-L Conductivity/Temperature Probe and A547A Interface - Page 11
... when the temperature coefficient is not possible, use the Sample instruction in CRBasic or Instruction 70 in standard...errors in Edlog.
Output processing
Over large ranges, EC is not linear and is best to 3% of 2%/°C as a rough estimate.
4. CS547A Conductivity and Temperature Probe and A547 Interface
2. Campbell Scientific has developed a linear correction for conductivity...
CS547A-L Conductivity/Temperature Probe and A547A Interface - Page 12
CS547A Conductivity and Temperature Probe and A547 Interface
PROGRAM
BeginProg
'evaluate and edit each of these 3 user specific values
Rcable=25
'edit this value to the actual footage of cable on your sensor
CellConstant=1.50
'edit this value with the Cell Constant (Kc) printed
'on the label of each sensor
TempCoef=2
'see section 9 of the manual...'Subtract resistance errors (Rp) caused...
CS547A-L Conductivity/Temperature Probe and A547A Interface - Page 13
CS547A Conductivity and Temperature Probe and A547 Interface
'correct errors in the EC measurement due to temperature Therm107 (TempDeg_C,1,3,Vx2,0,250,1,0) C25mScm = (Ct * 100)/(((TempDeg_C-25) * TempCoef) + 100) 'end scan loop by calling output table CallTable ECSample
NextScan EndProg
5.2.2 Edlog
*Table 1 Program
...
CS547A-L Conductivity/Temperature Probe and A547A Interface - Page 15
... (P37)
1: 2
X Loc [ one_ovrRs ]
2: nnn
F
3: 3
Z Loc [ Ct ]
Enter cell constant.
; ;The following program set corrects for errors of ionization in feet.
18: Z=X*F (P37)
1: 5
X Loc [ Rp ]
2: .00032
F
3: 5
Z Loc [ Rp ]
19...length in the EC ;measurement. ;
9 CS547A Conductivity and Temperature Probe and A547 Interface
; ;Subtract resistance errors (Rp) caused by the cell constant....
CS547A-L Conductivity/Temperature Probe and A547A Interface - Page 16
CS547A Conductivity and Temperature Probe and A547 Interface
24: IF (XF) (P89)
1: 3
X Loc [ Ct ]
2: 4
<
3: .474
F
4: 30
Then Do
25: Z=X*F ...02846
C2
7: .000000 C3
8: .000000 C4
9: .000000 C5
29: End (P95)
;This next program set will correct errors in the EC measurement resulting ;from temperature differences. ;
30: Temp (107) (P11)
1: 1
Reps
2: 3
SE Channel
3: 2
Excite all ...
CS547A-L Conductivity/Temperature Probe and A547A Interface - Page 17
CS547A Conductivity and Temperature Probe and A547 Interface
33: Z=X*F (P37)
1: 6
X Loc [ A ]
2: nnn
F
3: 8Z Loc [ TC_Proces ]
Enter TC (%/°C) to correct cond. reading.
34: Z=X+F (P34)
1: 8
X Loc [ TC_Proces ]
2: 100
F
3: 8
Z Loc [ TC_Proces ]
35: Z=X/Y (P38) 1: 7 2: 8 3: 9
X Loc [ Ct100 ] Y Loc [ TC_Proces ] Z Loc [ C25mScm_l ]
EC corrected for temperature.
;Output ...
CS547A-L Conductivity/Temperature Probe and A547A Interface - Page 21
...KCl and Na+ Solutions After Correction: < 2.0%, 0.45 to 7.0 mS cm-1 < 8.0%, 0.005 to compensate for ionization effects on the measurements. Bridge Measurement Error: < 1.0%
2. CS547A Conductivity and Temperature Probe and A547 Interface
11: Polynomial (P55)
1: 1
Rep
2: 3
X Loc [T25_01]
3: 4
F(X) Loc [f_of_T ]
4: .99124
C0
5: -1.8817 C1
6: 3.4789
C2
7: -3.51
C3
8: -1.2
C4...
CS547A-L Conductivity/Temperature Probe and A547A Interface - Page 22
FIGURE 8.1-1. Plot of ideal and actual correction between 0 and 0.44 mS cm-1
FIGURE 8.1-2. Plot of 0.0234, 0.07, 0.4471, 07, 1.413, 2.070, 3.920, and 7.0 mS cm-1. CS547A Conductivity and Temperature Probe and A547 Interface derived by measuring the standard solutions described in Section 2.2 with values of ideal and actual correction between 0.44 and 7.0 mS cm-1
16
CS547A-L Conductivity/Temperature Probe and A547A Interface - Page 23
... tolerance with an offset entered in Table 8.2-1.
TABLE 8.2-1. For the range of 0° to +50
Tolerance (±°C) 0.40 0.40 0.32 0.25 0.20
TABLE 8.2-2. CS547A Conductivity and Temperature Probe and A547 Interface
8.2 Temperature Measurement Error
The overall probe accuracy is the interchangeability specification of the thermistor, tabulated in the measurement instruction.
CS547A-L Conductivity/Temperature Probe and A547A Interface - Page 24
... from Section 5.2 in Edlog) outputs a precise 2 VAC excitation (4 V with temperature. CS547A Conductivity and Temperature Probe and A547 Interface
9. Place the CS547A in this section is the resistance of voltage measured to excitation voltage (Vs/Vx) which field measurements will be made.
The instruction calculates the ratio of the thermistor.
Resistance and datalogger...
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