Gems LS-2050 Series Instruction Bulletin

Maintenance . . .
An occasional cleaning when excessive contamination is present in the liquid is all that is
normally required. To clean unit: Compress split end of cam pivot pin, remove pin and
disassemble unit as shown below. Wipe parts clean with hydrocarbon solvent and
reassemble unit. Lock cam pivot pin by spreading split end slightly with screwdriver.
Housing and
Spring
Stem Assembly
Cam Pivot Pin
Electrical Connection . . .
Electrical connection is provided by wire leads with 1/2" NPT or junction box with 1/2"
NPT.
Typical Wiring Diagrams . . .
Important Points!
Product must be maintained and installed in strict accordance
with the National Electrical Code and GEMS technical brochure
and instruction bulletin. Failure to observe this warning could re-
sult in serious injuries or damages.
An appropriate explosion-proof enclosure or intrinsically
safe interface device must be used for hazardous area appli-
cations involving such things as (but not limited to) ignitable
mixtures, combustible dust and flammable materials.
*** Warning: To prevent ignition of flammable or combus-
tible atmospheres, disconnect power before servicing.
Pressure and temperature limitations shown on individual
catalog pages and drawings for the specified level switches
must not be exceeded. These pressures and temperatures
take into consideration possible system surge pressures/tem-
peratures and their frequencies.
Selection of materials for compatibility with the media is
critical to the life and operation of GEMS level switches. Take
care in the proper selection of materials of construction; par-
ticularly wetted materials.
P/N 72950
Rev. P
Permanent
Float and Cam
Magnet
Shuttle Assembly
1 1
1
Life expectancy of switch contacts varies with applications.
Contact GEMS if life cycle testing is required.
Ambient temperature changes do affect switch set
points, since the specific gravity of a liquid can vary
with temperature.
Level switches have been designed to resist shock
and vibration; however, shock and vibration should be
minimized.
Liquid media containing particulate and/or debris
should be filtered to ensure proper operation of GEMS
products.
Electrical entries and mounting points may require liq-
uid/vapor sealing if located in an enclosed tank.
Level switches must not be field repaired.
Physical damage sustained by the product may ren-
der it unserviceable.
Units are side-mounted in the tank at the point of high, low or intermediate
level sensing. Ideal for tanks with "hard-to-get-at" tops or bottoms. Float
and cam action is positive. Standard versions are U.L. Recognized - File
No. E45168. Explosion-proof units are approved for Class I, Division I,
Group D hazardous areas.
Explosion-Proof Versions
Standard
FM Approved
Versions
LS-2050's
----
30288
30290 55690
----
48068
----
48069
LS-52100's
52100 121753
116971
----
116972
----
*
See "Electrical Data" on next page for more information
**
100 VA switches are not UL recognized or CSA listed
Specifications . . .
Stem & Mtg Material Brass
Float Material Buna N
316 SS,
Other Wetted Beryllium Copper,
Teflon,
Materials
Ceramic
Water: To +180°F
Operating Temp °F
Oil: -40° to +250°F
PSIG, Max. @ 70°F
Mounting Attitude
Switch Differential
1/2" Min.
(In Liquid)
Liquid Specific Gravity
Lead Wires
LS-2050/LS-52100 Series
Side-Mounted Level Switches
Instruction Bulletin No. 72950
Switch
CSA Listed
----
SPDT, 20 VA
55690
SPDT, 20 VA
----
SPST, 100 VA, N.O.
----
SPST, 100 VA, N.C.
121753 SPDT, 20 VA
---- SPST, 100 VA, N.O.
---- SPST, 100 VA, N.C.
LS-2050
316 SS
316 SS
SS,
Teflon,
Ceramic
-40°F to +300°F
900
150
Horizontal: ±15°
Approx. 3/4"
.8 Min. .9 Min.
#18 AWG, 24" L., Polymeric
*
**
**
**
**
LS-52100
316 SS
304 SS
Teflon,
Ceramic
500
.85 Min.