Mobrey

6.2 RECHECKING ZEROIt 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 METHODSAUTO CAL6.3 AUTO CAL - ZERO SETTING PROCEDUREAUTOCAL is a simple step by step calibration routine in which the user is guided through the calibration process by aseries 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 systemaccuracy it is important to set up this zero loss accurately. When the system has been installed, immerse the sensorsin the clearest liquid available. If this is not practical, choose a point in the cycle when the liquid in the gap betweensensors has the lowest possible % suspended solids. For example on sewage treatment plants wash water would beacceptable.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.Press ENT.MAIN MENU 0TOGGLE RUN 0CALIBRATIONSETUPCALIBRATION 0AUTOCAL 0MANUAL ENTRYMax %Highlight the AUTOCAL option by pressing the down arrow key, and press ENT.CALIBRATION 0AUTOCAL 0MANUAL ENTRYMax %Highlight the SETZERO option and press ENT. The following will show on the display.Follow the instruction, the display will show the followingCALIBRATION 0SETZERO Max % 0SETSPANLAB VALSSET ZERO 0In clear liquor 0Press ⇒19IP258