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RM640
6.4.5 Level measurement
The device gives a current output signal that is related to level measurements when the menu
item C4.1.1 Current Out. 1 Var. (Current Output 1 Variable)
C4.1.1 Current Out. 1 Var. (Current Output 1 Variable) is set to "Level".
C4.1.1 Current Out. 1 Var. (Current Output 1 Variable)
C4.1.1 Current Out. 1 Var. (Current Output 1 Variable)
The display screen of the device can show level measurement readings if one or more of the
"Value Variable" menu items in the C6.4 1st Measurement Page or C6.5 2nd Measurement Page
menu are set to "Level".
Menu items related to level measurement are:
• Current output 1 menu (C4.1)
• Tank Height (C1.2)
• Blocking Distance (C1.5)
• Tank Bottom Offset (C1.11)
• Display readings in Normal mode:
Display readings in Normal mode: 1st Meas. Page (C6.4) menu
Display readings in Normal mode:
Display readings in Normal mode:
• Display readings in Normal mode:
Display readings in Normal mode: 2nd Meas. Page (C6.5) menu
Display readings in Normal mode:
Display readings in Normal mode:
The tank bottom (specified in menu item C1.2 Tank Height) is the reference point for level
measurement (0 m / 0 ft / 0¨). The position of the measurement scale (specified by the 0% Range
and 100% Range settings) is related to this reference point. If you configured a measurement
scale for the current output signal in the C4.1 Current output 1 menu, you can use a "standard
scale" or a "reversed scale". On the standard scale, the 0% Range measurement value agrees
with an output of 4 mA and the 100% Range measurement value agrees with an output of 20 mA.
On the reversed scale, the 0% Range measurement value agrees with an output of 20 mA and the
100% Range measurement value agrees with an output of 4 mA.
You can change the reference point from which level is measured. Use this menu item:
• Tank Bottom Offset (C1.11)
INFORMATION!
C1.11 Tank Bottom Offset
C1.11 Tank Bottom Offset
C1.11 Tank Bottom Offset
C1.11 Tank Bottom Offset
If you move the tank bottom offset below the tank bottom, add the value given in C1.11 Tank
Bottom Offset when you give a level for the C4.1.2 0% Range and C4.1.3 100% Range settings. If
you move the tank bottom offset above the tank bottom, subtract the value given in C1.11 Tank
Bottom Offset when you give a level for the C4.1.2 0% Range and C4.1.3 100% Range settings.
CAUTION!
If C4.1.1 Current Out. 1 Var. is set to "Level" and C4.1.3 100% Range (standard scale) is set in the
blocking distance, then the device will not be able to use the full current output range.
34-VF-25-131 iss.1 GLO Feb 2019 US
www.honeywellprocess.com
OPERATION
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