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(8) Clean inside of the detector main pipe When the pipeline where the detector is installed is filled with zero water, open the drain valve to let out the water from the pipeline. Clean inside of the pipeline where the density meter is installed by repeating Steps (7) and (8) until the water density can be said to be zero against the density of the object fluid. (It is not necessary to make the water clean and transparent.) (9) Fill up the detector pipe with zero water After cleaning the pipeline where the density meter is installed, close the drain valve, and fill it with zero water. Keep adding water while releasing air until water overflows the feed port. (10) Wait Leave the detector and water in this state for about 15 minutes. � In the event that the flow of the measured matter can be switched to that of the zero water by switching over to another valve, etc., it is all right to replace the work activities (2) to (10) with the relevant method and implement the following zero calibration while allowing the zero water to keep flowing. Even when switching the flow to that of zero water, wait for about 15 minutes before implementing the zero calibration. (11) Selecting the zero calibration menu (see Subsection 5.2.5) After verifying that the converter is in the setting mode ("2 SETTING MENU") through the operation of (1), use the [�] key to move the cursor of the LCD indicator to the menu number "6" of [6 ZERO CALIBRATION] and then press the [SET] key. (12) Check zero water density reading (see Subsection 5.2.11) The measured density of zero water is displayed on the density indicator. If the indicator shows [-0.00], it means that the zero point is off toward the negative. (13) Zero calibration (see Subsection 5.2.11) If the zero point is found to be off, press the [SET] key. The data (θ1, T0, zG) of the zero point is replaced by the current data, thus rendering the angle rotation to N=0 and automatically the density display to zero. The data (θ1, T0, zG) of the zero point is stored in the memory of the density meter until the zero calibration is implemented once again, thus making it possible to verify it on the constant monitoring menu. However, for the purpose of history management, keep a note of the data. � Unless the zero point is out of place, the zero calibration is suspended by pressing the [ESC] key. (14) End zero calibration This completes the zero calibration. Close the zero water valve, ensure that the sampling valve and drain valve are closed, then open the shutoff valves on both ends of the detector pipe, downstream first and upstream next. Lastly, close the shutoff valve on the bypass pipe to restore the flow of the fluid as before the calibration. (15) Restoring to the measuring mode Press the [ESC] key of the converter twice to return the menu of the LCD indicator to the initial menu display to return to the usual measuring mode from the setting mode. Thus, the measurement starts. � In the event that the external synchronized operation is selected, the external contact input signal is changed to ON, thus starting the density measurement after the specified delayed time has elapsed.
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