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Control lamp (1) - fault
indication (red)
Signal lamp (2) - Switch-
ing condition (yellow)
Signal lamp (3) - Operat-
ing condition (green)
Mode setting (4)
Adjustment of the density
range (5)
24
The instrument monitors the vibrating frequency, electronics tempera-
ture and internal instrument functions.
•
Red LED lights = fault
•
Relay deenergizes
The signal lamp for indication of the switching condition of the relay.
With the mode setting (4), the switching condition and hence the
function of the signal lamp can be changed.
•
Yellow LED lights = relay energized
•
Green LED lights = operating voltage on
With the mode setting (min./max.) you can change the switching
condition of the relay. You can set the required mode according to the
"Function table" (max. - max. detection or overflow protection, min. -
min. detection or dry run protection).
With this DIL switch (3) you can set the switching point to liquids
having a density between 0.47 and 0.7 g/cm³ (0.017 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 ≥ 0.47 g/cm³ (0.017 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.
Optionally the instrument can be also supplied with a min. density
range of ≥ 0.42 g/cm³ (0.015 lbs/in³). In this case, the max. permis-
sible process pressure is limited to 25 bar (363 psig).
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.
Note:
In case of intense boiling or bubbling processes as well as extreme
outgassing, the density of the gas/product mixture at the product
surface can be so low that it can't be detected by the sensor. This can
cause erroneous switchings.
6.3
Function table
The following table provides an overview of the switching conditions
depending on the set mode and the level.
SITRANS LVL200H - Operating Instructions
MAN-100048
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