Siemens SITRANS LVL200E Manuel d'utilisation - Page 23
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Signal lamp (1)
Adjustment of the density
range (2)
MAN-100411
Control lamp (LED) for indication of the switching condition
•
green = tuning fork uncovered
•
red = tuning fork covered
•
off = failure
With this DIL switch (2) you can set the switching point to liquids hav-
ing a density between 0.5 and 0.7 g/cm³ (0.018 - 0.025 lbs/in³). With
the basic setting, liquids with a density of ≥ 0.7 g/cm³ (0.025 lbs/in³)
can be detected. In liquids with lower density, you must set the switch
to ≥ 0.5 g/cm³ (0.018 lbs/in³). The specifications for the position of the
switching point relate to water - density value 1 g/cm³ (0.036 lbs/in³).
In products with a different density, the switching point will shift in the
direction of the housing or tuning fork end depending on the density
and type of installation.
Note:
Keep in mind that foams with a density ≥ 0.45 g/cm³ (0.016 lbs/in³)
are detected by the sensor. This can lead to erroneous switchings,
particulary when the sensor is used for dry run protection.
6.3
Function table
The following table provides an overview of the switching conditions
depending on the set mode and the level.
Mode on
Level
the signal
condi-
tioning
instrument
Mode A
Overflow
protection
Mode A
Overflow
protection
Mode B
Dry run
protection
SITRANS LVL200E - Operating Instructions
Sensor
Signal
Signal
current -
lamp -
Sensor
sensor
approx.
8 mA
Green
approx.
16 mA
Red
approx.
16 mA
Red
Signal conditioning in-
strument
Analogue
Signal
- input
lamp -
control
signal
condi-
tioning
instrument
> 3.8 mA
< 11.5 mA
> 12.5 mA
< 21 mA
> 12.5 mA
< 21 mA
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