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The screen shows an error message. Incorrect operating mode selected. Verify the operation mode selected. Select a valid operation. The screen shows a calibration or error message. There is a calibration error. Recalibrate the pH meter. The calibration of the buffer value is erroneous. Verify the buffer values used. The electrode is dirty. Clean and calibrate the electrode. * The batteries are badly installed. Verify the polarity of the batteries. The batteries are worn out. Replace the batteries.

If the scale registers less than 100, it is necessary to unwind the screw anticlockwise. Repeat the process until the balance is adjusted (adjusting the zero and the sensitivity). 23 CHAPTER 4 B A L A N C E S 4. Verify the plate’s brake. It is mounted on a threaded axis which touches the plate in order to prevent it from oscillating when the balance is locked. In case of an imbalance, the axis must be rotated slightly until the distance between the break and the plate is zero when the balance is locked.

Process. Verify that the changes and selections are done according to the manufacturer’s instructions. Repeat the selection or change. again. The balance’s reader is unstable. There is vibration on the surface of the table/counter. Place the balance on a stable surface. The front door of the balance is open. Close the front door to measure. The RS232 interface does not function. The interconnection cable is maladjusted. Check the connection of the interconnection cable. The screen shows incomplete readings or is locked.

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