76141
76142
76145
76147
76148
165570
164520
182600
76151
131100
140620
177100
155100
160450
160460
165800
165900
182700
191080
Part
Number Mounting
Type Housing
and Float
Polysulfone
Ryton® R-4
Ryton® R-4
Polysulfone
Ryton® R-4
Nylon
Polypropylene
Versaplast™
Ryton® R-4
Polypropylene
Nylon
Versaplast™
Polysulfone
Polypropylene
Nylon
Polypropylene
Nylon
Versaplast™
Noryl
Lead
Wire
Jacket
Min. Liquid
Sp. Gr.
.75
.98
.80
.75
.98
.65
.55
.80
.80
.55
.65
.80
.75
.55
.65
.55
.65
.80
.80
Operating Temperature
-40°F to +225°F(-40°C to +107.2°C)
-40°F to +300°F(-40°C to +148.9°C)
-40°F to +300°F(-40°C to +148.9°C)
-40°F to +225°F(-40°C to +107.2°C)
-40°F to +300°F(-40°C to +148.9°C)
-40°F to +250°F(-40°C to +121.1°C)
-40°F to +225°F(-40°C to +107.2°C)
-40°F to +250°F(-40°C to +121.1°C)
-40°F to +300°F(-40°C to +148.9°C)
-40°F to +225°F(-40°C to +107.2°C)
-40°F to +250°F(-40°C to +121.1°C)
-40°F to +300°F(-40°C to +148.9°C)
-40°F to +225°F(-40°C to +107.2°C)
-40°F to +225°F(-40°C to +107.2°C)
-40°F to +250°F(-40°C to +121.1°C)
-40°F to +225°F(-40°C to +107.2°C)
-40°F to +250°F(-40°C to +121.1°C)
-40°F to +250°F(-40°C to +121.1°C)
-40°F to +225°F(-40°C to +107.2°C)
Oper. Pres.
Max.
@ 70° F
Switch*
SPST
Lead
Wire
Gauge
100 psig 20 VA #22
AWG
Materials
150 psig
1
3
5
2
3N
3P
3V
4
7
10
12
PVC
PVC
Teflon®
Teflon®
Teflon®
TPE**
TPE**
TPE**
100 psig
150 psig
100 psig
50 psig
Teflon®
TPE**
TPE**
* See Electrical Data on back page for more information ** Thermoplastic Elastomer Zip Cord
The hydrolytically stable, glass-reinforced polypropylene is UL-recognized to UL 746B, at a relative temperature index of 65 degrees C
Specifications
Dimensional Data . . . (Mounting Attitude is Horizontal)
4-13/16”
122.2 mm
Lead
Wires
24” Ext.
Type 2
Type 3 Type 4
LS-7 Series (Plastic)
Compact, Side-Mounted Level Switches
Instruction Bulletin No. 78803 (Rev AC)
TPE**
Type 1
Locking Nut (Nylon)
4”
101.6 mm 11/16” Dia.
(17.5 mm)
2-3/4”
(69.8 mm)
Lead Wire
or Zip Cord
24” Ext.
5/8” - 11 Thread
↑
↓
5/8”
(15.9 mm)
5”
127 mm 11/16” Dia.
(17.5 mm)
3-7/8”
(98.4 mm)
Lead Wires
24” Ext. 1/2”
NPT
←→
↑
↓
5/16” (7.9 mm)
11/16” Dia.
(17.5 mm)
3-9/16”
(90.5 mm)
5/8” - 11
Thread
Hex
Locking Nut
↑
↓
←→
2-7/8”
(73 mm)
5/8”
(15.9 mm)
4”
101.6 mm 11/16” Dia.
(17.5 mm)
Lead Wires
24” Ext. 1/2”
NPT
←
→
↑
↓
100 psig
Gems Sensors Inc.
One Cowles Road
Plainville, CT 06062-1198
Toll-Free: 1-800-378-1600
Return Policy
Returns are accepted on stock items up to 30 days from date of order. You must contact our
Returns Department for a Return Authorization (RA) number. Return the goods - freight prepaid - in
the original container and include original packing slip. C. O. D. returns are not accepted. Gems
reserves the right to apply restocking charges.
Tel: 860-793-4357
Fax: 860-793-4563
• Gems products must be maintained and installed in strict accor-
dance with the National Electrical Code and the applicable Gems
product instruction Bulletin that covers installation, operation and
proper maintenance. Failure to observe this information may result
in serious injury or damages.
• For hazardous area applications involving such things as, but not
limited to, ignitable mixtures, combustible dust and flammable
materials, use an appropriate explosionproof enclosure or intrinsi-
cally safe interface device.
• Please adhere to the pressure and temperature limitations shown
throughout this catalog for our level and flow sensors. These
limitations must not be exceeded. These pressures and tempera-
tures take into consideration possible system surge pressures/
temperatures and their frequencies.
• Selection of materials for compatibility with the media is critical to
the life and operation of Gems products. Take care in the proper
selection of materials of construction, testing is required.
• NSF-approved sensors are made of materials approved for potable
water applications according to Standard 61.
• Stainless steel is generally regarded as safe by NSF and FDA.
• Life expectancy of switch contacts varies with application. Contact
Gems if life cycle testing is required.
• Ambient temperature changes do affect switch set points, since the
gravity of a liquid can vary with temperature.
• Our sensors have been designed to resist shock and vibration.
However, shock and vibration should be minimized.
• Filter liquid media containing particulate and/or debris to ensure the
proper operation of our products.
• Electrical entries and mounting points in an enclosed tank may
require liquid/vapor sealing.
• Our sensors must not be field-repaired.
• Physical damage sustained by product may render it unserviceable.
Important Points:
European Pressure Directive Addendum
The product is designed and manufactured in accordance with Sound Engineering Practice as defined by the Pressure Equipment Directive 97/23/EC.
This product must not be used as a “safety accessory” as defined by the Pressure Equipment Directive, Article 1, Paragraph 2.1.3. The presence
of a CE Mark on the unit does not relate to the Pressure Equipment Directive.
Dimensional Data (Cont.)
Type 5
.90”
(23 mm)
→
→
1.48”
(37.6 mm)
→
→
4.10”
(104 mm)
3.85”
(97.8 mm)
.85” Dia.
(21.6 mm)
↑
↓
.10”
(2.5 mm)
→
.33”
(8.4 mm)
→
→
→
Gasket, HNBR
(FDA Compliant)
Nut
5/8”-11
Note: Recommended hole size = 7/8” Dia. (Burr-Free)
1/32” to 3/32” tank wall
Type 10
All LS-7 Units: Install with float positioned as shown
for the required switch operation. Be sure that
markings on wrench flats are as follows: (1) Arrow
Vertical, (2) N.O. at top for N.O. operations, (3) N.C.
at top for N.C. operations
Type 7 Lead Wires
24” Extended 1/2” NPT
4-1/2”
5/8” (16 mm)
Wrench Flat
19/64”
(7.5 mm)
2-7/8”
(73 mm)
→
→
5/8”
1/2”
2-7/8”
4-1/4”
→
→
→
→
5/8”
Wrench Flat 1/2” NPT
Magnet
11/16”
Dia. Ref.
N.C. Actuation
Range
N.O.Actuation Range
Stainless Steel
Retaining Ring
#22 AWG Lead
Wires,Zip Cord
Style,24” - 27”
Extended
1.25”
Ref.
↓
↑
↓
↑
Units Shown Installed “Float Up”
for N.C. (Dry) Operation
N.C.
N.O.
Units Shown Installed “Float Down”
for N.O. (Dry) Operation
N.O.
N.C.
Types 3 and 4 Units
Assemble gasket (by user) on 5/8" - 11 threaded
mounting and install unit through burr-free clear-
ance hole in tank side, from inside of tank. Lock in
place with HEX nut (supplied). Tighten to15 in./Ib.,
Max. Do not overtighten.
HEX
Locking Nut Tank Side
Wrench
Flat Gasket
(By User)
5/8” -
11 X 4/8” Thd.
Type 10 Units
Install unit in burr-free 7/8" diameter hole in tank.
Gasket flange must rest firmly against tank wall. T urn
nut to compress seal. T ighten one-quarter turn past
hand-tight. Use wrench flat to hold housing, if
required.
Installation
Gasket
Flange
Tank Wall
(1/8” Nom.) Switch
Housing
Nut
Washer Compression Seal
in Sealed Position
Float
Assembly
LS-7 with Compression Seal (Type 10)
Type 12
Float Arc
Envelope
Sealing: When threading metal threads into a metal cou-
pling, pipe sealant or Teflon tape is recommended. Due to
potential compatibility problems, when sealing plastic
threaded units, a compatible pipe sealant such as No More
Leaks from Permatex is recommended.
Tightening (Plastic to Metal): When threading a plastic
level switch into a metal coupling, the installer should use a
suitable wrench and tighten the threads 1 to 1-1/2 additional
turns past hand-tight. Over-torquing of the threads will result
in damage to the plastic mounting plug.
Thread Treatment
Note:
.703” Dia. Thru Bore Required
Wrench
Flat
1/2”
NPT 5/8”
Max.
Tank Side
→
→
20
Pilot Duty
Volts
0-30
120
240
Amps AC
.4
.17
.080
Amps DC
.3
.13
.06
VA
Switch Ratings
- Maximum Resistive Load -
This product is suitable for Class I and Class II applications only, per the requirements of standard EN60730 and any additional
specific requirements for a particular application or medium being sensed. Class I compliance of metal bodied units requires
a ground connection between the metal body and the earthing system of the installation. Class I compliance of plastic bodied
units in contact with a conductive medium requires that the medium be effectively earthed so as to provide an earthed barrier
between the unit and accessible areas. For Class III compliance, a supply at safety extra-low voltage (SELV) must be provided.
Please consult the Factory for compliance information on specific part numbers.
Maintenance
Normally, no maintenance of any kind is required. When excessive contamination is present in the liquid, an
occasional wipe-down cleaning is all that
is needed.
Red
Red
N.O. or N.C. (Dry)
Typical Wiring Diagram
Electrical Connection
See Typical Wiring Diagram. Connect lead wires to load circuit, using approved method. Caution: See
“Specifications” (front page) and “Switch Ratings” (below) before connecting power.
Switch Operation
Depending on the mounting position, the float on these switches caneither rise or lower with the liquid level.
By rotating the switch 180°, the switch operation can be Normally Open or Normally Closed. Arrows on
exterior of mounting indicate N.O. when point up.
The switch is mounted so that the float lowers with the
liquid level. The switch is N.O.
Float Arc
Envelope
Normally
Open
Normally
Closed
The switch is mounted so that the float rises with the
liquid level. The switch is N.C.
Wrench
Flat
