Description
Discontinued, replaced by LVR500 Series.
.
The LVR20 and LVR30
Series continuous liquid level
sensors operate on a basic voltage
divider network principle. As the
float rises, a magnet in the float
closes a series of reed switches in
sequence which varies the
tapped-off portion of the voltage
divider resistor network. The LVR20
has the basic voltage divider
output—the regulated DC voltage
input equals the maximum voltage
output. The LVR20 has a nominal
1,200 resistance; thus, with a
10 Vdc supply, 8.3 mA of current
are required.
The DPF52 or DP24-E
panel meters can be used to power
and display the resistance from the
LVR20; when relays are required,
the DP25E-A meter can be used.
For maximum accuracy, the readout
device for the LVR20 should be
zero and span adjusted after wiring
is completed to compensate for any
effects due to the resistance of the
lead wires. The LVR20 can also be
made intrinsically safe when used
with OMEGA’s intrinsic safety
barriers and when properly
powered. The LVR30 Series is
provided with a signal conditioner to
provide a 4-20 mA output when
powered by 10-30 Vdc. The
LVR30 Series cannot be made
intrinsically safe.
All LVR30 units are supplied with a
J-box with screw terminal connections. All LVR20 units are
supplied without a J-box with
24 inches of bare wire coming out of
the top of the unit with a 1?2 MNPT
conduit connection. All LVR20 and
LVR30 Series units can be wired for
increasing output with either
increasing or decreasing height of
liquid; standard output is increasing
output with increasing height. For
other lengths, adaptor systems are
available. They consist of two parts:
the LVR-C coupling (2 x 2 FNPT)
and an LVR-A pipe nipple
(2 x 2 MNPT) of various lengths to
change the insertion depth of the
LVR20 or LVR30 sensor. When
using the adaptors, a zero offset is
introduced into the output signal
which must be compensated for in
the readout device (for example, the
mA signal will not go down to 4 mA,
nor will the voltage output go down
to zero).
Retaining clip pliers are required to
remove the float when using the
adaptor system.
† All amounts shown in AUD
Note: Units come complete with operator's manual.
LVR20 series is supplied without J-Box.
Ordering Example: (1) DPI8 1/8 DIN display panel meter, AUD590.22 plus (1) LVR22 316 SS level sensor with 2 ft long indicatating length, AUD1,565.00 plus (1) U24Y175 24 Vdc power supply, AUD323.89, AUD590.22 + 1,565.00 + 323.89 = AUD2,479.11
