Campbell OXYGUARD TYPE III CS512 User Manual download pdf (Page 16)

Campbell Scientific CS512 Oxyguard Type III Dissolved Oxygen Sensor

7.2 Edlog

Edlog Instruction 1 or 2 can be used. Example 1 shows the single-ended instruction

for measuring the Sensorex probe; example 2 shows the differential instruction. The

example measurement instructions that follow do not store data to final storage.

Additional instructions (typically P92, P77, and output processing instructions such as

P70) are required to store data permanently.

EXAMPLE 3. Portion of CR10X Sample Program using P1

1: Volt (SE) (P1)

1: 1 Reps

2: 24 250 mV 60 Hz Rejection Range ; code 23 used for CR23X

3: 1 SE Channel

4: 1 Loc [ DOmV ]

5: 1.0 Multiplier *See Calibration*

6: 0.0 Offset

EXAMPLE 4. Portion of CR10X Sample Program using P2

1: Volt (Diff) (P2)

1: 1 Reps

2: 24 250 mV 60 Hz Rejection Range ; code 23 used for CR23X

3: 1 DIFF Channel

4: 1 Loc [ DOmV ]

5: 1.0 Multiplier *See Calibration*

6: 0.0 Offset

8. Calibration

The multiplier is used to calibrate the CS512 sensor. To calculate the multiplier:

1) Program the datalogger using a multiplier of one.

2) Place the OxyGuard sensor in the air, shaded from the sun. Wait for readings to

stabilize. This may take 15 minutes or more.

3) Determine the air temperature and barometric pressure.

4) Using a calibration chart such as that provided in the sensor’s manual, determine

the oxygen concentration of the air.

5) Use the following equation to calculate the multiplier:

M = P/R

M = Multiplier

P = Concentration in PPM of the air (from the calibration chart in Appendix A)

R = The signal output of the OxyGuard sensor when using a multiplier of one

6) Change the multiplier in the datalogger program from one to the calculated

number.

A more common way to enter the multiplier is to insert a separate instruction in

the program. This will allow a new multiplier to be added to the program without

rewriting, compiling, and downloading the program to the data logger.

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Campbell OXYGUARD TYPE III CS512 User Manual Page 16