Page 1
UNIVERSAL LIQUID-LEVEL SENSOR
Hermetically
Sealed Magnetic
Reed Switch
Permanent
Magnet
Float
S
SN
N
S
Magnet
Reed
Switch
Glass
Envelope
N
LV 1 4 0
LV 1 4 0
LV141, $105,
shown larger
LV140 Series
Starts at
than actual size.
$
105
Steel Double-Wall Tanks,
Containment Sump,
and Piping Sump Applications
⻬ Compact—Fits Interstitial
Spaces
⻬ Suitable for
Hydrocarbons or Water
⻬ No Calibration Necessary
⻬ Long Service Life
The compact LV140 single-float,
liquid-level sensor is ideal for use in
steel double-wall tanks or containment
sump areas. It requires no calibration,
and is easy to install and maintain.
When positioned vertically at the
bottom of a steel tank’s stand pipe
or in a sump, it detects liquids such
as hydrocarbons and water, as low
as 3⁄4" from the bottom of a tank or
sump. The epoxy-encapsulated design
is ideal for harsh environments. An
integral slosh shield guards the float
from debris.
The principle behind the LV140 is
straightforward. The float is
equipped with powerful, permanent
magnets. As the float rises or lowers
with liquid level, it actuates a
magnetic reed switch mounted
within the stem. In response, the
electrical circuit opens or closes,
activating an external alarm or
control circuit. When mounted
vertically, the LV140 provides a
consistent accuracy of ±1⁄8".
The reed switch ensures long,
trouble-free service. Hermetically
sealed, these switches allow for
repeatability, with actuation points
that remain constant over the life of
the unit.
Note: The LV140 sensor is a non-voltageproducing device and does not contain
energy-storing components. However, since
primary use is in hazardous locations, an
appropriate intrinsically safe (IS) interface
device is required for its use.
K-97
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Sealing
Nut
Liquid
Tight
Fitting
Slosh
Shield
36.5
(1-7/16) REF
88.9
(3-1/2) REF
Cable
Float
Retaining
Ring
19.0
(3/4)
Actuation
Retaining
ring
Non-Isolated
No Dry
or
NC Dry
Isolated
No Dry
or
NC Dry
Single
IS Relay
No Dry
or
NC Dry
Note: If 2 signal lines must be maintained at above ground potential,
Shield
Float
exploded view.
Typical Wiring Diagram
Hazardous
Area
Black
Red
2-Conductor
Cable
Hazardous
Area
Black
Red
2-Conductor
Cable
Hazardous
Area
Black
Red
2-Conductor
Cable
an individual zener barrier is required per single line.
Non-Hazardous
Area
Zener
Barrier
Non-Hazardous
Area
Supply Zener Barrier
3
3
2 1
2 1
Signal Return
Zener Barrier
Non-Hazardous
Area
Load
Intrinsically-Safe Relay
Fuse*
Fuse*
LV141, $105,
DC
power
supply
annunc.
Sence
Resistor
DC
power
supply
annunc.
Fuse
Fuse
K-98
Hot Vac
Neutral
Vac
Dimensions: mm (in)
SPECIFICATIONS
Wetted Materials: Brass, Buna, nylon,
PVC, beryllium, copper
Operating Temperature:
-40 to 110°C (-40 to 230°F)
Water: Up to 82.2ºC (180ºF)
Accuracy: ±3.2 mm (
1
⁄8")
Switch Rating: 20 VA, 120 to 240 Vac
pilot duty; 20 W, 50 to 240 Vdc resistive
Cable: 2-conductor PVC or PFA coated
jackets [7.6 m (25') extended]
Weight: 453 g (1 lb)
MOST POPULAR
MODEL HIGHLIGHTED!
To Order
(Specify Model Number)
Model No. Price Cable
LV141 $105 PVC jacketed,
LV142 180 PFA jacketed
Comes complete with 7.6 m (25'),
2-conductor PVC or PFA jacketed cables and
operator’s manual. For normally open switch
add suffix “-NO” at the end of the part
number; no extra cost.
Ordering Example: LV142, PFA jacketed
sensor, $180.
level sensor
normally closed,
dry
level sensor
normally closed,
dry
K
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