Table of Contents
Advertisement
Larger tank, dimensions in feet:
C air
=
air
C oil
=
oil
For this slightly larger tank, the capacitance
ranges from 16.6 pF for 0% (probe in air) to 33.2 pF
for 100% (tank filled with oil).
After calibration:
16.6 pF 0% 4 mA or 20 mA
33.2 pF 100% 20 mA or 4 mA
Application: level indicator and solid-state switch output
The loop current provides:
•
a reading proportional to level, within the 0 - 100% range, at menu 00 or 10 on the
device, or at a remote indicator
•
an out-of-range signal ooL alternating with PV if the level is above URV or below
LRV
The solid-state switch is activated at Upper Threshold Setting and deactivated at Lower
Threshold Setting. In the diagram below, it is used to activate a pump via an auxiliary
power circuit.
•
The activation and deactivation can be modified by Upper and/or Lower Threshold
delays (menus 13 and 14).
•
The reading can be stabilized if necessary by applying Damping (menu 0A): the
update value for Damping is controlled by menu 09.
Example:
The level is to be held between 90% and 8%.
solid-state
switch
output:
selected at
menu 17
and
controlled
by menus
13 to 18.
Page 102
SITRANS LC500 – OPERATING INSTRUCTIONS
7.32 4.5
----------------------------------- pF
Log 60 0.63
7.32 4.5
----------------------------------- pF
=
Log 60 0.63
Indicator: primary variable viewed at menus 00 or 01;
current loop connection
Active shield section
(menu 0C) USL
(menu 0F) URV = 100%
Upper Threshold Setting = 90%
menu 15 (activation hysteresis)
menu 16 (deactivation hysteresis)
Lower Threshold Setting = 8%
(menu 0E) LRV = 0%
(menu 0B) LSL
SITRANS
LC500
=
16.6pF
33.2pF
d = 0.63"
(5.0ft)
units or% selected in menu 01
0-100%
solid-
state
output
6" (0.5ft)
L = 54"
(4.5ft)
60"
auxiliary
power
pump
power
P
75.8 pF
14.3 pF
7ML19985GE04
Advertisement
Table of Contents
