Campbell OXYGUARD TYPE III CS512 User Manual download pdf (Page 17)

User Manual

In the CR510, CR10X, and CR23X, use Instruction P36. The multiplier is entered

into an input location called DOmult using the numeric display in PC200W,

PC208W, LoggerNet, PC400, PConnect, PConnectCE, or the CR10KD.

EXAMPLE 6. Sample Program using P36

57: Z=X*Y (P36)

1: 1 X Loc [ DOmV ]

2: 2 Y Loc [ DOmult ]

3: 3 Z Loc [ DOppm ]

In all dataloggers that use CRBasic, an expression is written. The multiplier value

is entered into the expression through the Public Table using the numeric display

in PC200W, LoggerNet, PC400, PConnect, and PConnectCE.

EXAMPLE 7. Sample Program using Expression

DOppm = DOMult * DOmV

9. Maintenance

The CS512 sensor needs little maintenance. Regular cleaning of the membrane is all

that is required. The membrane is very durable and can be cleaned with a cloth or soft

paper. Do not scratch it clean with your fingernail.

10. Agitator Control

In low flow conditions (less than about 5 cm/sec), it may be necessary to add an

agitator to the CS512 sensor. Campbell Scientific ships the agitator with a repeat

cycle timer. Using the repeat cycle timer requires no datalogger programming.

However, some users choose to use a solid state relay and have the datalogger

agitate the water on the sensor face either periodically throughout the day or just

before measurement. Agitating just before the measurement saves on power and

causes less wear and tear on the agitator and sensor membrane.

The wiring for the agitator as controlled by this example program would be as

follows:

WHITE

BLACK

Agitator

+ -

12 V Battery

4 1

#7321 Relay

Crydom D1D07

3 2

Ground/G

Datalogger

Port C1

Figure 10-1. Agitator Wiring

1 2 ... 12 13 14 15 16 17 18 19 20 21 22

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Campbell OXYGUARD TYPE III CS512 User Manual Page 17