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DOTX-45 Dissolved Oxygen System Part 6 – Configuration

DOTX-45 33 -

% Saturation The most common display of D.O. in water is either PPM or

mg/L units. However, the same PPM value at different water

temperatures can represent quite different concentrations of

oxygen in terms of the percent of saturation. This display

simply indicates the % of oxygen saturation represented by

the current PPM or mg/L display.

v4.02 Transmitter software version number.

0.00 PPM D.O. Reading in PPM (or mg/L if selected under Instr Type)

Note: A display test (all segments ON) can be actuated by pressing and

holding the ENTER key while viewing the model/version number on

the lower line of the display.

For the relay-based analyzer version, the screens are basically the same, with

the additions to show two analog outputs instead of one (#1 and #2.)

The MEASURE screens are intended to be used as a very quick means of

looking up critical values during operation or troubleshooting.

6.23 Calibration Menu [CAL]

The calibration menu contains items for frequent calibration of user parameters.

There are four items in this list: Cal D.O., Cal Temp, Set Range, and Cal Zero.

Cal D.O. The oxygen calibration function allows the user to adjust the

transmitter span reading to match a reference solution, or to

set the sensor zero point. See Part 7 - Calibration for more

details.

Cal Temp The temperature calibration function allows the user to

adjust the offset of the temperature response by a small

factor of ±5 °C. The temperature input is factory calibrated

to very high accuracy. However, long cable lengths and

junction boxes may degrade the accuracy of the temperature

measurement in some extreme situations. Therefore, this

feature is provided as an adjustment. See Part 7 -

Calibration for more details.

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Dot-x SERIES Spezifikationen Seite 34