Siemens SITRANS LC500 Operating Instructions Manual page 52

Method 2. Set value for 100% (URV): values must be displayed as percent (at menu 01,
Pv = P)
a. Calculate the percentage value of the current level.
b. Set rotary switch to 1, and press both buttons to adjust the value to P .
c. Set the rotary switch to F (Full).
d. Press the RED (+) or BLUE (–) button to increase or decrease the reading on the
LCD until it matches the known (actual) percentage. The push-buttons appear to
work in reverse for this function
(menu 09) in order to reach the desired value.
e. 100% value is set.
Example:
Set LRV in capacitance mode, then set menu 01 to Pv = P (percent mode) and immerse
the probe in the product (values shown below are arbitrary example values only):
0% ( LRV)
100% (URV)
Span
Current level
Change in capacitance
Current percent of span
LCD displays 78.00 (percent)
In this example, to decrease the reading to 70.00, you need to press (+) to increase the
span, which will reduce the percentage, until the value reaches 70.00. If the steps are too
big you need to change the stepsize (menu 09) to a lower value.
Changing stepsize value: menu 09
The factory setting is 1: the LCD displays U: 1.0
Set rotary switch to 09, and press BLUE (–) button to reduce stepsize: values range from
0.01 to 1,000.
Example:
LCD displays 78.00 (percent)
Known percent of span = 70%
Decrease needed is 8, but setting for stepsize is 10: menu 09 set to U: 10.
Press BLUE (–) button to reduce stepsize to 1: LCD displays U: 1.0.
Return to OF, and decrease value to 70.00 (percent).
You may still need to reduce the stepsize further. If changing the stepsize value has no
apparent effect, press both buttons simultaneously to change the reading to 100%. From
there you may adjust it until the correct percentage reading is reached.
1.
In capacitance mode, the display for menu 0F shows the actual URV, but in per-
cent mode, when you adjust the reading, you are in fact stepping the capaci-
tance value. As you step the capacitance down, you decrease the range and
reduce the span, so the percentage increases in relation to the smaller span.
Therefore the (+) and (–) buttons appear to function in reverse.
Page 44 SITRANS LC500 – OPERATING INSTRUCTIONS
1
. You may need to decrease the stepsize value
=14.20 pF
= 34.20 pF
= 20 pF
= 28.20 pF
= 28.20 – 14.20 = 14
= 14/20 = 70%
7ML19985GE04