How To Measure Correctly In Silos With Curved Or Conical Bottoms - Ametek DR6500 Handbook

DR6500

6.4.7 How to measure correctly in silos with curved or conical bottoms

It is possible that the device cannot find the bottom of the silo if it is installed in a silo with a dish-
shaped or conical bottom. The form of the silo bottom causes a delayed radar reflection and the
device will display the error message "Measurement is lost in the tank bottom".
You can offset the tank bottom reference point to find the delayed radar reflection. Obey the
instructions that follow:
• Measure the true tank height with a different measurement method.
• Empty the silo.
• Enter Program mode and go to menu item C.1.2 Tank Height. Push the [> > > > ] button.
• Enter the password used at this time for the "Expert" access level. If it is the default password,
enter "0058". Push [^ ^ ^ ^ ] and then [> > > > ].
• Increase the value in menu item C.1.2 Tank Height. This value must be a minimum of 20%
more than the true tank height.
• Go to a measurement page in Normal mode that shows the distance. Make a note of the
distance of the reflection measured by the device.
This is the delayed radar reflection. The distance shown will be the new tank height.
i
• Subtract the distance to the reflection from the true silo height.
• Go to menu item C1.11 Tank Bottom Offset (Program Mode > Full Setup > Install.
Parameters > Tank Bottom Offset). Parameters > Tank Bottom Offset
Parameters > Tank Bottom Offset Parameters > Tank Bottom Offset
• Type in the difference you calculated as a negative value.
i A negative value will move the reference point above the silo bottom (as given in menu item
C.1.2 Tank Height).
• Push [^ ^ ^ ^ ], 2 × [ ] and [> > > > ] to go to C1.2 Tank Height.
• Type in the distance that was shown in Normal mode.
• Push 4 × [^ ^ ^ ^ ] to exit to the "Save Configuration?" window.
• Select Yes Yes and push [^ ^ ^ ^ ]. Yes Yes
i The device will go back to Normal mode.
INFORMATION!
For more data on menu items, refer to Function description on page 71
DR6500-PM-English-Issue 1
Program Mode > Full Setup > Install.
Program Mode > Full Setup > Install. Program Mode > Full Setup > Install.
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OPERATION
6
table C: Full Setup.
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