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Device settings:
(The device is first restored to factory settings before being commissioned)
TV0 selected: Transmitter Variable 0 is PV
Lower Range Value (0% of range) is set to 14.3
Upper Range Value (100% of range) is set to 75.8.
Current loop is in analog mode, with both buttons pressed
Solid-state switch enabled, contact closed selected
Activation hysteresis is set to 90.
Deactivation hysteresis is set to 8.
When the level reaches 90%, the solid-state output is closed and the pump is started via
the auxiliary circuit. When the level drops to 8% the solid-state output is opened, the
auxiliary circuit is deactivated, and the pump stops.
Application: Analog fault signalling (2-state output)
In 2-state mode, the loop current signals whether the probe is covered or uncovered, and
the continuous level measurement is unavailable.
2-state mode provides:
•
a 4 mA or 20 mA output to menu 07, when the level reaches one of the threshold
settings
•
a 3.6 or 22 mA output to menu 07 (if 2-state fault signalling is enabled at menu
08) when the process level exceeds one of the limit settings (menu 0B and 0C).
The above settings can be modified:
•
The response time when thresholds are reached can be modified by Upper and/
or Lower Threshold delays (menus 03 and 04).
•
The mA reading can be stabilized if necessary by applying Damping (menu 0A):
the increment value is controlled at menu 09.
1.
S:cc appears while the button is pressed. See menu 17 on page 71 for more details.
7ML19985GE04
SITRANS LC500 – OPERATING INSTRUCTIONS
Menu 01 reads Pv = 0
Menu 0E reads 14.30
Menu 0F reads 75.80
Menu 07 reads C:An
1
Menu 17 reads S:cc
Menu 15 reads 90.0
Menu 16 reads 08.0.
Page 103
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