CS510 OxyGuard Dissolved Oxygen Probe

3)Determine the air temperature and barometric pressure.

4)Using a calibration chart such as that provided in the probe’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)

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

6)Change the multiplier in the CR10 program from one to the calculated number.

10.Maintenance

The OxyGuard probe 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. Please see the OxyGuard manual for complete maintenance procedures.

11. Agitator Control

In low flow conditions (less than about 2 cm/sec), it may be necessary to add an agitator to the OxyGuard probe. The distributor for OxyGuard in North America sells a self-timed agitator which can be purchased through Campbell Scientific. The self-timed agitator requires no datalogger programming. However, some users choose to use a solid state relay and have the datalogger agitate the water on the probe 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 probe membrane.

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

Ground/G

 

 

 

 

BLACK

 

 

 

4

1

 

 

Agitator

Datalogger

 

 

#7321 Relay

 

 

 

 

 

 

 

 

 

 

 

 

Crydom D1D07

 

 

 

 

Port C1

 

3

2

 

WHITE

 

 

 

 

 

 

 

 

 

 

 

+-

12 V Battery

6