Omega Products LVD-804 User Manual
FAIL-SAFE DRY MATERIAL
ROTARY PADDLE LEVEL SWITCHES
LVD-800 Series
Starts at
$
300
available units, the
⻬ Reliable Magnetic
Technology (Patented)
⻬ Twist On/Off Cover—
No More Bolts!
⻬ Wiring Access—2
Conduit Entrances
⻬ Motor Shuts Off When
Paddle is Impeded
Significantly Extends
Motor Life and Reduces
Maintenance Costs
⻬ Local Status Indicating
Light on Most Models
⻬ Standard Units Rated
to 121°C (250°F)
⻬ Hi-Temp Models Rated
to 399°C (750°F)
The LVD-800 Series fail-safe bin
monitor is the state-of-the-art in
rotary paddle technology. Utilizing
magnetic sensing technology and
a unique housing design, the
LVD-800 Series fail-safe bin monitor
is the most reliable, technician-friendly,
rugged and economical truly
fail-safe rotary paddle point level
control sensor of its kind.
The LVD-800 Series fail-safe bin
monitor provides the ultimate in
performance wherever critical
continuous operation must be
ensured. Detection of both material
presence and its own operational
status is performed on a continuous
basis. The LVD-800 Series fail-safe
level sensor monitors its electrical
and mechanical operating
condition. This, in conjunction
with separate outputs provided
for material sense and unit status
(fault conditions) makes this unit a
“truly” fail-safe device.
While the LVD-800 Series fail-safe
bin monitor is an evolution in rotary
paddle technology, it continues
to use tried-and-true operating
techniques. Unlike many other
LVD-800 Series
incorporates a feature
that automatically shuts
off its motor when the paddle
is in a stalled condition. This
extends the life of the unit and
minimizes maintenance.
Principle of Operation
The operation of the
LVD-800 Series rotary
paddle fail-safe bin monitor
uses magnetic sensing
technology to detect both
material presence and
operational status of the unit.
This method is simple and
more reliable than that used
by other manufacturers. The
unit is installed through the
wall of the vessel so that the
paddle protrudes inside
the vessel. A small electric
motor drives the paddle,
which rotates freely in the
absence of material.
The rotation of the unit’s
shaft is continuously monitored
by detection of a magnetized
rotating disk (patented). When
the paddle is impeded by material,
the shaft rotation stops. The motor
rotates within the housing and
magnetized sections of the motor
mounting plate are detected
(patented). Use of these magnetic
sensing techniques eliminates
problems that may occur with
fouling of the optical systems used
by other brands.
The built-in microcontroller
performs self-diagnostics and
monitors both shaft and motor
mounting plate rotation. This allows
the unit to easily distinguish
between material presence and any
electrical and mechanical failure of
the unit. When material presence is
detected, the SENSE relay changes
state and the drive motor is deenergized to extend motor life. This
output is available to control a
process function or alarm circuit.
When the material level drops, a
tension spring returns the drive
motor to its original running
condition and is reactivated.
A unit failure is detected by sensing
a lack of shaft rotation while
material presence has not been
detected by rotation of the motor
mounting plate. In a failure
condition the independent FAULT
relay will change state indicating
that an error condition exists.
Monitoring the state of both the
SENSE and FAULT relays provides
the most flexibility for control and
fail-safe monitoring.
The rugged and reliable design of
the LVD-800 Series fail-safe bin
monitor makes it the best choice for
critical level control applications.
The unit is compatible with many
granular, pelletized and powder
bulk applications. It can be utilized
for high level indication of materials
over 160 kg/m3 (10 lb/ft3) and for low
and intermediate level indication for
LVD-803, $300, shown
smaller than actual size.
(Paddles sold separately.
See page K-7 for details)
K-X
Recommended Not recommended
Guard bracing
Good
paddle
coverage,
not in direct
material flow
Away
from
significant
vibration
Poor
paddle
coverage
Guard not
reinforced
Close to
excessive
vibration
In
direct
material
flow
Vessel
wall
101.6
(~4.0)
Dimensions: mm (inches)
Guard threaded
into full coupling
Flex coupling
Full coupling to
interconnect the
guard pieces
Extensions are
coupled to
extend length
(threaded and pinned)
Bracing to
reinforce
guard
Installation considerations Extension and guard installation
materials over 80 kg/m3(5 lb/ft3).
The LVD-800 Series bin level
monitor can be installed almost
anywhere dry bulk materials are
stored including bins, hoppers,
silos and tanks.
SPECIFICATIONS
Power Requirements: 115 Vac
(±15%); 9 VA; 50/60 Hz; 230 Vac
(±15%); 9 VA; 50/60 Hz
Ambient Operating Temp: -40 to 65°C
(-40 to 150°F)
Internal Bin Temp*:
Standard Unit: to 121°C (250°F)
Hi-Temp Unit: to 399°C (750°F)
Conduit Connection: Two (2)
Typical Applications include, but are not limited to (density)
Feed – Ground Corn 560 kg/m3(35 lb/ft3) Silica Sand 1520 kg/m3(95 lb/ft3)
Rocks – Limestone Crushed Pellets – Polypropylene
1360 to 1520 kg/m3(85 to 95 lb/ft3) 544 to 576 kg/m3(34 to 36 lb/ft3)
Wood Shavings 48 to 160 kg/m3(3 to 10 lb/ft3) Coffee – Roasted Beans 352 to 480 kg/m3(22 to 30 lb/ft3)
Rubber – Ground 400 to 800 kg/m3(25 to 50 lb/ft3) Metals – Iron Chips 2640 kg/m3(165 lb/ft3)
Tea Leaves 192 kg/m3(12 lb/ft3) Coal – Lump 400 to 800 kg/m3(25 to 50 lb/ft3)
Peanuts – Shelled 560 to 720 kg/m3(35 to 45 lb/ft3) Malt – Ground – Dry 320 kg/m3(20 lb/ft3)
Clays – Kaoline 320 to 960 kg/m3(20 to 60 lb/ft3) Ash – Coal Dry 560 to 720 kg/m3(35 to 45 lb/ft3)
Talcum Powder 736 to 992 kg/m3(46 to 62 lb/ft3) Grain – Oats 400 to 560 kg/m3(25 to 35 lb/ft3)
Acrylic Resin 528 kg/m3 (33 lb/ft3) Sugar – Granulated 880 kg/m3(55 lb/ft3)
Flour – Wheat 480 to 560 kg/m3 (30 to 35 lb/ft3) Sawdust 64 to 192 kg/m3 (4 to 12 lb/ft3)
Cement Powder – Portland
1360 to 1520 kg/m3 (85 to 95 lb/ft3)
Influenced by mounting, material thermal conductivity and ambient temperature.
*
3
⁄4NPT
OUTPUTS
Material Sense: One SPDT;
5A @ 250 Vac, 30 Vdc max
Unit Status (Fault): One SPDT;
5A @ 250 Vac, 30 Vdc max
Maximum Pressure: 30 psi (2 bar)
Sensitivity: 80 kg/m
3
(5 lb/ft3) minimum
material density (when using large
3-vane paddle)
Indicators: Red and green high
intensity LEDs indicate material sense
and unit status conditions (Ordinary
Location unit only)
Housing: Die cast alum, NEMA-4, IP66
Housing Finish: Powder coating
Mounting Connection: 1
1
⁄4NPT
Weight: Approx. 3.9 kg (8.5 lb)
K-X
MATERIALS OF CONSTRUCTION/
ACCESSORIES
Flexible Couplings:
304 stainless steel
Mounting Plates: Carbon steel or
304 stainless steel
All Paddles Except Ex-Flex: 304 SS
Ex-Flex Belt: 304 SS coupling,
rubber/fabric blend belt
Flexible Cable Extension:
1
304SS
⁄4" diameter
LISTINGS/APPROVALS
Hazardous Locations: Class I,
Div. Groups C, D; Class II,
Div. 1 & 2, Groups E, F, G, CE Mark
See Material Characteristics
Guide for additional information.
K
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