Siemens SITRANS LVL200E Інструкція з експлуатації Посібник з експлуатації - Сторінка 22
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Characteristics reversal
(2)
Sensitivity adjustment (3)
Simulation key (4)
22
The characteristics reversal can be carried out with the DIL switch.
You can choose between falling characteristic curve (switch position
max.) and rising characteristic curve (switch position min.). This al-
lows you to output the desired current.
Modes
•
min. - rising characteristic curve (High current when immersed)
•
max. - falling characteristics (Low current when immersed)
The NAMUR output can be switched over to falling or rising charac-
teristics (see also "Function chart").
For applications according to WHG, the DIL switch must be set to
position max.
With this DIL switch (3) you can set the switching point to liquids
having a density between 0.5 and 0.7 g/cm³ (0.018 and 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.
The simulation key is located in a recess on the upper side of the
electronics module. Push the simulation key with a suitable object
(screwdriver, pen, etc.).
When the key is pushed, a line break between sensor and process-
ing unit is simulated. The signal lamp on the sensor extinguishes. The
measuring system must signal a fault and take on a safe state when
the key is pushed.
Keep in mind that downstream connected instruments will be acti-
vated during operation. This allows you to check the correct function
of the measuring system.
6.3
Function chart
The following chart provides an overview of the switching conditions
depending on the set mode and the level.
Note:
The mode setting on the NAMUR amplifier must be selected in such
a way that the switching output takes on safe state in case of failure (I
≤ 0.6 mA).
SITRANS LVL200E - Operating Instructions
*7ML19985KY01*