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6.2 RECHECKING ZERO
It is recommended that the zero is checked regularly. The frequency of re-calibration is dependent on the process.
However, it is suggested that this be done at least every 6 months.
CALIBRATION METHODS
AUTO CAL
6.3 AUTO CAL - ZERO SETTING PROCEDURE
AUTOCAL is a simple step by step calibration routine in which the user is guided through the calibration process by a
series of user friendly screens. AUTOCAL is the recomended calibration proceedures.
The attenuation of the ultrasonic signal in dean liquid varies slightly from sensor to sensor. For optimum system
accuracy it is important to set up this zero loss accurately. When the system has been installed, immerse the sensors
in the clearest liquid available. If this is not practical, choose a point in the cycle when the liquid in the gap between
sensors has the lowest possible % suspended solids. For example on sewage treatment plants wash water would be
acceptable.
Firstly enable access using the “TOGGLE RUN” command in the MAIN MENU.
Highlight the CALIBRATION option in the MAIN MENU by pressing the down arrow key.
MAIN MENU 0
TOGGLE RUN 0
CALIBRATION
SETUP
Press ENT.
CALIBRATION 0
AUTOCAL 0
MANUAL ENTRY
Max %
Highlight the AUTOCAL option by pressing the down arrow key, and press ENT.
CALIBRATION 0
AUTOCAL 0
MANUAL ENTRY
Max %
Highlight the SETZERO option and press ENT. The following will show on the display.
CALIBRATION 0
SETZERO Max % 0
SETSPAN
LAB VALS
Follow the instruction, the display will show the following
SET ZERO 0
In clear liquor 0
Press
⇒