Campbell CS526 Manuel d'instructions télécharger pdf (Page 17)

CS526 ISFET pH Probe

7.2.3.4 SplitStr() Instruction

The SplitStr() instruction has the following syntax:

SplitStr(SplitResult,SearchString,FilterString,NumSplit,SplitOption)

SplitResult—an array in which the split string will be stored.

SearchString—the string on which this instruction will operate. This will

be the variable entered for the Dest parameter for the SerialIn()

instruction (see above).

FilterString—enter “String” (this value will be ignored because of the

SplitOption that will be used).

NumSplit—enter 2

SplitOption—enter 0. This splits out numeric values.

7.2.4 Programming for Calibration

To output in pH units instead of digital counts, enter the offset and multiplier

into the datalogger program. Simple program instructions can be used to make

the required periodic calibration easier. See Appendix C, Calibration

(p. C-1),

for an example program.

7.3 Calibration

Calibration should be carried out according to the detailed procedure outlined

in Appendix C, Calibration

(p. C-1). The calibration should use two or more pH

standards, listed in TABLE 7-4, which are available from Campbell Scientific.

TABLE 7-4. Calibration Standards

pH Part Number

4 25587

7 25586

10 25588

Frequency of calibration depends on the level of accuracy required and the

coating / fouling nature of the measured samples.

8. Troubleshooting

Follow the procedure provided by the Assistance section at the

beginning of this document if the CS526 is not operating properly

and requires return to Campbell Scientific.

The most common causes for erroneous pH data include:

• poor sensor connections to the datalogger

• damaged cables

• scratched chip

• contaminated or clogged diaphragm

NOTE

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Campbell CS526 Manuel d'instructions Page 17