Ysi Professional Plus Bedienungsanleitung PDF herunterladen (Seite 17)

Local DO allows for localized DO% measurements. This sets the calibration

value to 100% regardless of the altitude or barometric pressure. Highlight Local

DO and press enter to enable (

) or disable (

) this function. Local DO is

a method for the Pro Plus to factor in the barometric pressure on each DO

measurement. In essence, if the barometric pressure changes you wouldn’t notice

the difference in the DO% readings in air-saturated water or water-saturated air.

Local DO is ideal for EU compliance. When Local DO is enabled, an L will

appear next to DO% on the run screen. DO mg/L readings are unaffected by the

selection of DO Local.

LDS (Last Digit Suppression) rounds the DO value to the nearest tenth; i.e.

8.27 mg/L becomes 8.3 mg/L. Highlight LDS and press enter to enable (

) or

disable (

) this function.

DISPLAY  DISSOLVED OXYGEN

Press Sensor , highlight Display and press enter. Highlight DO and press

enter. All DO units can be displayed simultaneously. Highlight the unit(s)

and press enter to activate (

) or deactivate (

) units from the run screen.

Note - You will not be able to display dissolved oxygen unless it is Enabled in the

Sensor Setup menu first, see previous section.

DO % will show DO readings in a percent scale

from 0 to 500%.

DO mg/L will show DO readings in milligrams

per liter (equivalent to ppm) on a scale from 0

to 50 mg/L.

DO ppm will show DO readings in parts per million (equivalent to mg/L) on a

scale from 0 to 50 ppm.

AUTO STABLE  DISSOLVED OXYGEN

Auto Stable indicates when a reading is stable.When Auto Stable is enabled, AS

will blink next to the parameter until it is stable. Once the parameter is stable,

AS will stop blinking.

To enable Auto Stable, press Sensor

highlight Auto Stable and press enter. Highlight

DO and press enter.

Highlight Enabled and/or Audio Enabled

(instrument will beep when the stability

is achieved) and press enter to confirm. The Auto Stable Sensitivity can be

decreased or increased. Highlight Sensitivity and use the left and right arrow

keys to slide the bar. The more sensitive you make it (larger black bar) the

harder it is to achieve stability in a changing environment.

The Auto Stable system works by examining the previous 5 readings, computing

the percent change in the data and comparing that change against a % threshold

value. The % threshold value is determined by the Sensitivity bar setting. The

following chart can be used as a guide when setting the Sensitivity bar.

Sensitivity selected by User % Data Variance Threshold

100 - Most Sensitive, Sensitivity

bar is set to the far right

0.05%

75 0.62525%

50 1.275%

25 1.8875%

0 - Least Sensitive, Sensitivity

bar is set to the far left

2.5%

Example:

The instrument obtained the following data:

Reading #1 95.5 DO%

Reading #2 95.7 DO%

Reading #3 95.8 DO%

Reading #4 96.1 DO%

Reading #5 95.3 DO%

The instrument is programmed to determine the minimum and maximum

data value over the previous 5 samples, and to compute the percent difference

between those values. In this example, that gives a percent change of:

% Change = 100 * ((96.1 – 95.3 ) / 95.3)

% Change = 0.83%

In this example, if the Sensitivity bar is set to the far right, the Auto Stable

requirement would not be met and AS would continue to blink. However,

if the sensitivity bar is set to the median threshold (1.275%), the Auto Stable

requirement would be met and AS would display steadily on the display.

Within the Auto Stable menu, you can also choose to Hold All Readings for as

many parameters as you set for Auto Stable. For instance, if DO and pH have

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