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Current values used as signals from digital transmitters
Fault- mA Value (F)
F = 1
0
3.6
4.0
3.8
Whenever the local situation allows, the zero adjustment and the full scale can be set
using the push-button feature and the appropriate menu selection. In most cases you can
do a one-point calibration
The total isolation between the measurement circuit and the current- loop circuit
provides immunity during the use of cathode protected measuring tanks. Connection to
PLC equipment is possible without any difficulty.
The Upper Sensor Limit (USL) and Lower Sensor Limit (LSL) are set to 330 and 1 pF
respectively, and the following conditions apply:
•
The Upper Range Value (URV) and Lower Range Value (LRV) should be within
the USL to LSL range, but can be set anywhere within that range.
•
An interruption of the measuring connection will be detected: a loose or
interrupted connection results in up to 0.5 pF capacitance, which is below the
adjusted LSL and thus signals a FAULT condition.
Applications for Solid-State Output
The solid-state output is a polarity independent switch output. The solid-state switch has
two possible functions:
•
In normal process conditions, it can be activated/deactivated when the product
level reaches the upper/lower threshold settings (set in menus 15 and 16).
•
When a fault or failure is detected in the process or in the measurement circuit,
it can signal a fault (set in menu 18).
The solid-state switch has its own parameter set: menu items 13 to 18, (see
Menu Levels
tables on page 43, and
Mode)
chart on page 48). Menu 1E provides a short-cut that sets both the current loop
and the solid-state switch, to provide alarm and fault signalling in the event of an error/
2
failure
. The factory setting for menu 1E is FailSafe High.
In menu 0E and menu 0F, you set the Upper and Lower Range Values (URV and LRV) for
relay operation. Within that range, the solid-state switch has independent settings for
Upper and Lower Threshold, (menus 13 and 14) and the corresponding delays (menus 15
and 16).
1.
Set up using push-buttons (for overfill protection)
See
2.
FailSafe Mode
See
7ML19985GG03
Current values for signal detection
Measurement value
F = 0
1
by using the push-buttons to input the actual level in %.
Rotary Switch Positions – Quick Reference (FSH
on page 81, for details.
Pointek CLS500 – INSTRUCTION MANUAL
Fault- mA Value (F)
F = 1
20 22
20.5
The Two
on page 51.
mA
Page 39
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