Omega LVD-800 Specification

Fail-SaFe Dry Material
rotary PaDDle
level SwitcheS

LVD-800 Series

available units, the LVD-800 Series

U Reliable Magnetic

Technology

U Twist On/Off Cover—

No More Bolts!

U Wiring Access—

2 Conduit Entrances

U Motor Shuts Off When

Paddle is Impeded
Significantly Extends
Motor Life and Reduces
Maintenance Costs

U Local Status Indicating

Light on Most Models

U Standard Units Rated

to 121°C (250°F)

U 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

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. 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. 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 de-energized 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.

K-X

LVD-803 shown smaller than actual size.

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
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.

Installation considerations Extension and guard installation

Recommended Not recommended

Vessel
wall

Bracing to
reinforce
guard

Guard bracing

Good
paddle
coverage,
not in direct
material flow

Away
from
significant
vibration

Poor
paddle
coverage

Close to
excessive
vibration

Guard not
reinforced

In
direct
material
flow

Outputs

Material Sense: One SPDT;

5A @ 250 Vac, 30 Vdc maximum
Unit Status (Fault): One SPDT;
5A @ 250 Vac, 30 Vdc maximum

SPECIFICATIONS

Power Requirements: 115 Vac (±15%);

9 VA; 50/60 Hz; 230 Vac (±15%); 9 VA;
50/60 Hz
Ambient Operating Temperature:

-40 to 65°C (-40 to 150°F)

Internal Bin Temperature*:
Standard Unit: to 121°C (250°F)
Hi-Temp Unit: to 399°C (750°F)
Conduit Connection: Two (2)

3

⁄4 NPT

Maximum Pressure: 30 psi (2 bar)
Sensitivity: 80 kg/m

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
Weight: Approx. 3.9 kg (8.5 lb)

3

(5 lb/ft3) minimum

1

⁄4 NPT

Typical Applications include, but are not limited to (density)

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:
304SS

Listings/Approvals

Hazardous Locations: Class I,
Div. Groups C, D; Class II,
Div. 1 & 2, Groups E, F, G, CE Mark

Guide for additional information.

Guard threaded
into full coupling

Flex coupling

Full coupling to
interconnect the
guard pieces

Extensions are
coupled to
extend length
(threaded and pinned)

101.6
(~4.0)

Dimensions: mm (inches)

1

⁄4" diameter

See Material Characteristics

K

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)

3

Acrylic Resin 528 kg/m
Flour – Wheat 480 to 560 kg/m
Cement Powder – Portland

1360 to 1520 kg/m

Influenced by mounting, material thermal conductivity and ambient temperature.

*

(33 lb/ft3) Sugar – Granulated 880 kg/m3 (55 lb/ft3)

3

(85 to 95 lb/ft3)

3

(30 to 35 lb/ft3) Sawdust 64 to 192 kg/m

3

(4 to 12 lb/ft3)

K-X

LVD-800-2V

Accessory (paddles sold separately)

LVD-800-3V LVD-800-3VL

Enclosure dimensions

127.0
(5.0)

176.3
(6.94)

215.9
(8.5)

141.2
(5.56)

3

2 (

1

1

⁄4 NPT

Threaded entry to
accept flex coupling,
extension, or paddle

Dimensions: mm (inch)

Coverblock

⁄4) NPT

Turns in

177.8 (7.0)
circle

50.8
(2.0)

Turns in

228.6 (8.0)
circle

LVD-800-EFC LVD-800-1V

508.0

(~20.0)

38.1

(1.50)

3.0

(0.12)

Turns in

127.0 (5.0)
circle

LVD-800-2V LVD-800-1VT

3.0

(0.12)

127.0 (5.0)

Turns in

circle

25.4
(1.0)

Turns in

228.6 (9.0)
circle

LVD-800-4V LVD-800-1VS

25.4

3.0

(0.12)

(1.0)

Turns in

127.0 (5.0)
circle

Turns in

177.8 (7.0)
circle

Dimensions: mm (inch)

63.5

(2.50)

25.4
(1.0)

146.0

(~5.75)

152.4
(6.0)

*

Comes complete with operator’s manual.
For 24 Vdc power add suffix “-24VDC” to LVD-803 model number, for additional cost.
For SS (top or vertical mount only) add suffix “-HT” to model number for high temp version (750°F), for additional cost.

Paddles (Required) See Material Characteristics Guide for reference.

LVD-800-3V 3 Vane standard for average weight [>240 kg/m
LVD-800-3VL 3 Vane large for light weight material [>160 kg/m
LVD-800-1VS 1 Vane insertable

**

LVD-800-1VS is insertable through either a half or full 1
LVD-800-1V is insertable through a half 1

To Order

FAIL SAFE Models Description

LVD-803 Dry level switch, 115 Vac, 1¹⁄₄ NPT
LVD-803-EXP Dry level switch, class 1, div. 1 and 2, groups C, D; class II, div. 1 and 2, groups E, F, G
LVD-804 Dry level switch, 230 Vac, 1¹⁄₄ NPT

Order paddles separately.

Model No. Description

LVD-800-1V 1 Vane insertable

control of heavy materials 38 mm (1

** for low level control of avg. weight [>320 kg/m

1

") diameter

⁄

2

3

(15 lb/ft3)] materials

3

(10 lb/ft3)]

** scimitar for light to average weight [>320 kg/m

LVD-800-2V 2 Vane for heavy materials [>1200 kg/m
LVD-800-4V 4 Vane for use with average to heavy weight materials [>1200 kg/m
LVD-800-1VT

1 Vane triangular for light to average weight material; top down mount only for long fibrous materials

LVD-800-EFC Ex-flex 3-ply 508 mm (20") belt vane for heavy materials over 51 mm (2") in diameter (top mount only)

[>1200 kg/m3 (75 lb/ft3)]

Insertable paddles eliminate the need for mounting plate.

1

⁄4" coupling.

1

⁄4" coupling, that is welded to the bin wall.

3

(75 lb/ft3)] under 1

K-X

3

(20 lb/ft3)] material or low to high level

3

(20 lb/ft3)] material

1

" in diameter

⁄

2

3

(75 lb/ft3)]

Half

LVD-800-FCE/SGG/I extension and guards

Coupling

11.9

(0.47)

LVD-800-MP(*)

(6) 9.0 (0.34) Holes
equally spaced on

178.0 (7.0) B.C.

23.6

(0.93)

Full

Coupling

11⁄4 NPT

21.3

(0.84)

203.2
(8.0)
O.D.

LVD-800-FC

88.9 (3.50)

203.2
(8.0)
O.D.

1

⁄4

1

NPSM

Dimensions: mm (inches)

ONLY

Threaded entry
to accept
extensions
or paddles

LVD-800-FCE

1

⁄4 NPT

both ends

LVD-800-SEGI/S

1

⁄4 NPT

both ends

LVD-800-SGGI

11⁄4 NPT
both ends

1981.2 ± 6.4 (78.0 ± 0.25)

CSL + 19.0 ± 6.4 (0.75 ± 0.25)

CSL ± 6.4 (0.25)

Cable

extension

(can be shortened

in field)

Rigid

extension

Guard

Accessories

Model No. Description

LVD-800-FC Flexible coupling spring flex for absorbing heavy loads, side loads and protect internal workings

which extends the life of the paddle

LVD-800-SGGI-6†† †Shaft guard 1¹⁄₄" pipe, SCH40, galvanized iron (additional cost per inch)
LVD-800-SGSS-6†† †Shaft guard 1¹⁄₄" pipe, SCH40, stainless steel (additional cost per inch)
LVD-800-FCE Flexible cable extension, 304SS, 1.98 m (78") (can be cut in field) eliminates the need for a

mounting plate, extension guard and flexible coupling (additional cost per inch)

LVD-800-SEGI-6†† ††Solid shaft extension: ¹⁄₄" pipe, SCH40, galvanized (additional cost per inch)
LVD-800-SESS-6†† ††Solid shaft extension: ¹⁄₄" pipe, SCH40, stainless steel (additional cost per inch)
LVD-800-MPHCS Mounting plate with 1¹⁄₄ NPT half coupling, carbon steel, for side mount installations
LVD-800-MPFCS Mounting plate with 1¹⁄₄ NPT full coupling, carbon steel, for top mount installations where a

shaft extension and shaft guards are required

LVD-800-MPHSS Mounting plate with 1¹⁄₄ NPT half coupling, stainless steel, for side mount installations
LVD-800-MPFSS Mounting plate with 1¹⁄₄ NPT full coupling, stainless steel, for top mount installations where

a shaft extension and shaft guards are required

LVD-800-MPA Mounting plate with 1¹⁄₄ NPT heavy duty aluminum for flat surfaces or thin walled vessels

where extra strength is required

Shaft guards are required for use with solid shaft extensions to limit the movement caused by side loading that would otherwise damage

†

the working components of the paddle unit. Shaft guards should be the same length as the extension and should always be used when the
extension meets or exceeds 460 mm (18") in length.

Extension and guard lengths [not to exceed 3.6 m (144") in length]

††

Comes complete with operator’s manual.
For 24 Vdc power add suffix “-24VDC” to LVD-803 model number, for additional cost.
For SS (top or vertical mount only) add suffix “-HT” to model number for high temp version (750°F), for additional cost.

Ordering Examples: LVD-803-EXP, switch, 115 Vac class I, div. 1 and 2 groups C & D; class II, div. 1 and 2, groups E, F, G rated and
LVD-800-3V, 3 vane paddle for average weight (15 lb/ft3) material.

LVD-803, switch, 115 Vac, and LVD-800-1V, 1 vane insertable paddle for average weight (20 lb/ft3) material.

Replacement Parts

Model No. Description

LVD-800-SR Spiral roll pin, 3.18 x 4.76 mm (¹⁄₈ x ³⁄₁₆") SS (connects paddle to solid shaft coupling)
LVD-800-GDP Grooved dowel pin, 3.18 x 15.88 mm (¹⁄₈ x ⁵⁄₈") SS (connects solid shaft coupling to shaft)
LVD-800-DM115 Drive motor assembly for LVD803 (115 Vac, 50/60 Hz)
LVD-800-DM230 Drive motor assembly for LVD803 (230 Vac, 50/60 Hz)
LVD-800-DM24DC
LVD-800-MS Micro seal
LVD-800-MMP Motor mounting plate assembly
LVD-800-B Bearings (2 required per unit)
LVD-800-DS Stainless steel drive shaft with slip clutch and gear assembly
LVD-800-RR Retaining ring (for retaining the motor mounting plate to drive shaft)
LVD-800-RS Return spring assembly

Drive motor assembly for LVD803 (24 Vdc)

K

K-X