Catalogo sensores-de-nivel-de

Catalogo sensores-de-nivel-de
Float Type Multi-Point
Custom Length – 1 to 7 Levels
GEMS Custom Length level switches are extremely versatile. Within this
section you’ll find level switches that are configured to your custom
specifications at the GEMS factory.
Single Actuation Levels
LEVEL SWITCHES – MULTI POINT
When one of our Standard Single Level switches doesn’t extend to the
length you need, no problem, order a Custom Length single level switch
from this section. Specify lengths to over 11 feet. These units also
offer you the flexibility of mounting a low, or intermediate level switch
from the tank top rather than a bottom or side
mounting.
2 to 7 Levels
Single
Multiple
Levels. As
Lengths to
GEMS Custom Length models can be
Many as Seven
over 11 Feet
configured with “up to seven” independent
switch actuation levels, depending on the
series type. These “multi-station” units offer
the most practical way to monitor multiple
liquid level points within a single tank. Only
a single entry point into the tank is required, and all electrical wiring
emanates from a single source. In addition to tracking changing level
points of a single liquid within a tank, “multi-station” level switches
are ideal for monitoring liquid interfaces and emulsions in vessels
simultaneously containing two or more liquids. Contact GEMS with your
liquid specifications for further information on this type of application.
Typical Application
GEMS Custom Length Switches are used to monitor water, diesel or
lube oils, chemicals and petrochemicals.
Pump-Up/Pump-Down Operations
Pump-Up/Pump-Down
with Intermediate Level Indication
ANNUNCIATOR
HIGH
LEVEL
HIGH
LEVEL
CONTROLLER
INTERMEDIATE
LEVELS
LOW
LEVEL
PUMP
LOW
LEVEL
PUMP
Using GEMS Custom Length level switches, junction boxes, solid-state relays and annunciators, complete liquid
level control systems are easily configured.
Liquid Interface Monitoring
In addition to monitoring the surface level of liquids, many GEMS Level
Switches can be used to sense the interface point between dissimilar
liquids sharing the same tank. Monitoring water condensation in fuel
storage tanks, and separating chemical emulsions in process systems
are two typical application examples. Multi-station level switches can
be configured to monitor this interface point in addition to high and low
liquid levels. Contact Gems Sensors Inc. with your specific application.
B-1
Visit www.GemsSensors.com for most current information.
HIGH LEVEL
MONITORING
INTERFACE LEVEL FLOAT
(EXAMPLE: OIL/WATER)
LOW LEVEL
MONITORING
INTRODUCTION
Contents
Page Start
Small Size Engineered Plastic
LS-300 Series........................................................ B-3
Ultrasonic — Non-Contact
Multi-Point Sensors
LS-300TFE Series............................................... B-7
 Accurate and reliable sensing method
 Ideal technology for difficult fluids
LS-700 Series...................................................... B-14
Typical Media
• Acids • Wastewater • Inks and Paints • Slurries • Food and Beverage
• Semiconductor Process Chemicals • Oils and Petroleum Distillates
Small Size Alloy
Large Size Plastic
LEVEL SWITCHES – MULTI POINT
Gems delivers the answer for challenging
fluid measurement with our new ultrasonic
UCL-510 Transmitter/Multipoint Level
Switching Combo. This accurate and reliable
sensor is designed for the most difficult
fluids to monitor — including ultrapure, dirty,
coating, scalding or corrosive types.
LS-350 Series...................................................... B-10
LS-800PVC Series............................................. B-18
LSP-800.................................................... B-20
Large Size Alloy
LS-800 Series...................................................... B-22
Integrated Temperature Sensors
for LS-700 & LS-800 Series.......................... B-25
OrderIt! Check List
How Ultrasonic Monitoring Works
All LS-800 Series Models............................. B-26
Mounted at the top of a tank, the sensor continuously
transmits pulses of high-frequency sound waves that
travel away from the sensor, hit the surface of the liquid
and return to the sensor. Solid-state electronics measure
the time it takes from transmitted sound to return of the
echo. With reference to the speed of sound in air, the
exact distance of the liquid surface from the sensor can be calculated
with high accuracy (±0.125˝ (3mm) of maximum range). Level/Distance
measurements are automatically temperature-compensated throughout
the operating temperature range of the sensor.
UCL-510 Ultrasonic
Transmitter/Multipoint Switch................ C-29
See the UCL-510 and other Continuous Level
Transmitters in Section C.
High Alarm
Relay 1
Valve Closed
Relay 2
Valve Open
UCL-510 Series multi-point switches are designed for
easy automatic tank “Hi/Lo” liquid level control. They
combine non-contact continuous sensing with four
SPST relays; actuation points are field adjustable in a
range to 49 inches.
Visit www.GemsSensors.com for most current information.
B-2
Small Size – Engineered Plastics
Ordering is Easy! See Page B-6.
Easy online ordering too!
LS-300 Engineered Plastics Series
Brings Multi-Point Switching to Shallow Tanks
Your most complete line of small, polysulfone
liquid level switches...all from Gems Sensors.
LEVEL SWITCHES – MULTI POINT
 All-Plastic Wetted Parts
 1 to 4 Actuation Levels
 Lengths to 20 inches (50cm)
 U.L. Recognized; CSA Listed Versions Available
Designed for the high quantity needs of the OEM, LS-300 Series
Switches are the ideal level sensor for shallow tanks and reservoirs.
Compact and versatile, these low-cost, plastic level switches offer a
broad choice of mountings and float materials. The following pages
illustrate the various design parameters available to configure custom
LS-300 Series Switches.
1. Mounting Types
Each mounting type can be configured with stem lengths (LO) and float materials
indicated in this bulletin.
NPT Threads
Straight Threads
Type 21
1/8˝ NPT
.49
12.3
Type 22
1˝ NPT
1/8˝ NPT
.14
4
LO
Type 31
3/8˝ – 24
.25˝
6.4
1.38˝
35 HEX
1˝ NPT
.49˝
12.3
3/8˝ - 24
STRAIGHT
THREAD
1.07˝
27
.50
HEX
13
Type 32
1-5/16˝ – 12
.50˝
HEX
13
LO
.20˝
5
LO
.49˝
12.5
G1/4˝
(1/4˝-19 BSP)
Type 42
G 1˝ (1˝ – 11 BSP)
1.63˝
HEX
41
.63˝
HEX
16
.20˝
5
LO
M12 x 1.5
STRAIGHT
THREAD
.20˝
5
.47˝
11.9
.63˝
16
G1˝ (1˝ -11BSP)
BUNA “N”
O-RING
.59˝
15
LO
LO
.63˝
HEX
16
LO
Type 11
No Mounting
Type 711
5/8˝ – 11
1.33˝
1.00˝
(34)
(25)
LO
.437˝ (11.1)
FLATS
5/8˝-11
THREAD
(2) GASKET
(BUNA)
(2) WASHER
(NYLON)
1.33˝
1.00˝
(34)
(25)
1-5/16˝ - 12
STRAIGHT
THREAD
LO
Type 51
M12 x 1.5 Straight Thread
.240˝
6.1
PG13.5 THD.
1.50˝
HEX
38
.25˝
13.2
Compression Types
Metric Threads
Type 41
G 1/4˝ (1/4˝ – 19 BSP)
Type 33
5/8˝ – 11
.437 (11.1) FLATS
JAM NUT
5/8˝-11 THREAD
(NYLON)
WASHER
(NYLON)
LO
COMPRESSION
GASKET
(HNBR, BLACK)
Flange Mountings2
Type 61
2˝ O.D. Flange
Type 63
Pop Flange
POP-IN
FLANGE
.156˝/4 DIA. (4) HOLES EQUALLY SPACED
AS SHOWN ON A 1.50˝/38 B.C.
.13˝
3
.25˝
6
.19˝
4.8
.50˝
13
2˝
DIA
51
Stem, Mounting
and Collar Material
BUNA “N”
GASKET
LO
LO
MOUNT IN ø1.31˝ - 1.32˝ OPENING
Polysulfone, Noryl®
Max Length (L0)
20 inches (50 cm) Tolerance of L0 = ±1/16˝ (2 mm)
Mounting Position
Vertical ±30° Inclination
Notes:
1. Type 71 mounting to be used with 3/4˝ diameter float only.
2. Not recommended for pressure applications.
B-3
.58˝
15
Visit www.GemsSensors.com for most current information.
Dimensions expressed as:
inches
millimeters
FLOAT TYPE
2. Electrical Connections
Type 3
Liquid-Tight
Cable
Type 2
Cable
Type 4
Junction Box Assembly
Type 5
DIN43650 Plug
2.60
66
1.97
50
2.28 WIDE x 2.51 LONG
58
64
1.80
46
1.12
MAX
28
Type 6
DIN43651 Plug
2.20
56
LEVEL SWITCHES – MULTI POINT
Type 1
Leadwire
1.34
34
Compatible
Mounting Type(s)
All
Protection
Rating
42
IP64
#22 AWG PVC
Wire, 24"
(610mm) Min.
Extended Leads
IP68
42
42
3 Poles
6 Poles
IP65
#22 AWG PVC
Jacketed Cable, 24" (610mm) Min.
Terminal Box
(7 Terminals)
Max. Number of
Levels
Group I
4
2
4
Group II
2
1
2
* Not CSA Approved
** Not UL or CSA Listed
3. Float Types
A single float type is selected for use at all actuation points.
Buna N
Float
Material
3/4˝
1˝
1.10˝
28
Float
Dimensions
15/16˝
23.8
3/4˝
19
Part Number
1˝
25.4
187553
Float Material
Suitable for…
Operating
Temperature1
Polypropylene
Polysulfone
39049
Oil, Fuels
Water: to 180°F (80°C)
1.06˝
27.0
1˝
25.4
1.1˝
28
3/4˝
19
1˝
25.4
39005
Hollow –
20% Glass Filled
Solid Foamed
197732
1˝
25.4
119455
1˝
25.4
1˝
25.4
145730
Water-based Liquids
Broad Chemical Use
Low Specific Gravity
Liquids
-40°F to +221°F
(-40°C to +105°C)
-40°F to +212°F
(-40°C to +100°C)
-40°F to +221°F
(-40°C to +105°C)
Oil: to 221°F (105°C)
Oil: -40°F to +221°F
(-40°C to +105°C)
300 (21)
250 (17)
50 (3.5)
Atmospheric
150 (10)
50 (3.5)
0.70
0.50
0.75
0.95
0.90
0.60
Pressure,
psi (bar) Max.2
Min. Media
Specific Gravity
Notes:
1. Operating temperature range based on float ratings.
2. When used with mounting Type 21, 32 or 22 only; Mounting Type 61, and 63 are not recommended for
pressure applications. Pressures are derated with increasing temperature above 70°F
Dimensions expressed as:
inches
millimeters
Visit www.GemsSensors.com for most current information.
B-4
5. Wiring Group
YELLOW (4)
GREEN (3)
L4
BLACK (1)
RED (2)
L1
GREEN (3)
BLACK (1)
LEVEL SWITCHES – MULTI POINT
Cable
(*)
RED (2)
L2
L1
Approvals: LS-300 Series switches are U.L.
Recognized – File No. E45168;
CSA Listed – 30200.
WHITE (4)
YELLOW (3)
RED (1)
RED (2)
YELLOW (3)
BLUE (4)
L3
L2
Switch (SPST, N.O. or N.C.): 10/20/50/100 VA.
Notes:
1. Units with 50 and 100 VA switches are not U.L. Recognized
or CSA Listed.
2. Other wiring options available. Consult factory.
3. Consult Factory for load information.
L4
WHITE (4)
Group II Wiring: 1 or 2 Actuation Levels.
Group 2
RED (2)
Lead Wire
(*)
Group I Wiring: 1 to 4 Actuation Levels.
Group 1
BROWN (5)
Electrical Connection
BROWN (5)
Typically, one float is required for each point at which
you need a switch action to occur. The number of
actuation levels available depends on the Group Type
Wiring selected; see below.
BLACK (1)
4. Electrical Specifications
L3
L2
L2
L1
L1
*Pin correlation of plug connectors shown in parenthesis.
6. Actuation Level Dimensions
Actuation
Levels*–Typical
Switch actuation levels are determined following the guidelines below.
A =Minimum distance to highest actuation level.
1/2˝
B =Minimum distance between actuation levels.
L4
1/4˝
C =Minimum distance between two actuation levels with one float (Note: One float for two levels can be used only when low level is N.C. dry and high level is N.O. dry).
A
D =Minimum distance from end of unit to lowest level.
L3
B
Float Type
L2
L1
L O **
(LENGTH
OVERALL)
Buna N – 1˝
(P/N 39049)
Buna N – 3/4˝
(P/N 187553)
Polysulfone
(P/N 39005)
Solid P.P. – 1˝
(P/N 119455)
C
D
* Actuation level distances and LO (overall unit length) are measured
from inner surfaces of mounting plug or flange. See mounting types
on Page B-3 for LO reference point.
** Length Overall (LO) = L1 + Dimension D. See Mounting Types for
Maximum Length values.
B-5
Solid P.P. – 3/4˝
(P/N 197732)
Hollow P.P. – 1˝
(P/N 145730)
Dimensions
A
B
1˝
(25 mm)
11/16˝
(17 mm)
7/8˝
(22 mm)
5/8˝
(16 mm)
1/2˝
(13 mm)
7/8˝
(22 mm)
1-3/4˝
(45 mm)
1-7/16˝
(11.1 mm)
1-3/4˝
(45 mm)
1-1/2˝
(38 mm)
1-3/4˝
(45 mm)
C
D
1/8˝
(3 mm)
Minimum
11/16˝
(18 mm)
7/8˝
(22 mm)
15/16˝
(24 mm)
1-1/8˝
(29 mm)
1.19˝
(30 mm)
7/8˝
(22 mm)
Notes:
1. Actuation levels are calibrated on ascending fluid level with water, specific gravity 1.0, as the calibrating
fluid, unless otherwise specified.
2. Tolerance on actuation levels is ±1/8˝ (3 mm).
Visit www.GemsSensors.com for most current information.
This is a  Request for a Quote
 Order P.O.#_______
Quantity Needed _____________
Photocopy This Form
Use one form for each product
type you are selecting.
This form may also be completed online at
gemssensors.com for RFQ.
Date Required ____/____/_____
Shipping Method:_____________
Partials Accepted: Yes
 No
Name ___________________________________________
Company _________________________________________
Street ___________________________________________
City________________________ State_____ Zip__________
Phone ( _____ ) ___________________________________
Fax ( _____ ) ______________________________________
LS-300 Engineered Plastics Custom Length,
Float Type Level Switch Check List
Operational Parameters
This information is essential to the accurate and proper operation of
your GEMS configurable sensor. Please complete fully and accurately
before ordering.
1. Liquid Media: __________________________________________
5. Viscosity: __________________ SSU
 psig
2. Pressure: Minimum ___________ Maximum
__________
bar
 °F
 °F
°
3. Temperature: Minimum _______ Maximum
__________  °C
C
6. Tank Material: _________________________________________
4. Specific Gravity: Minimum ______
7. Unit is Mounted In:  T – Top Mounted  B – Bottom Mounted
Maximum __________
Product Parameters
Tank Depth: ___________________________________________
4. Electrical Rating:
1. Mounting Type:
 11 – No Mounting
 21 – 1/8˝ NPT
 22 – 1˝ NPT
 31 – 3/8˝-24 Straight Thread
 32 – 1-5/16˝-12
 41 – G1/4˝ (1/4˝-19BSP)
 42 – G1˝ (1˝-11BSP)
 51 – M12 x 1.5 Straight Thread
 61 – 2˝ O.D. Flange
 33 – 5/8˝-11
 63 – Pop Flange
 71 – 5/8˝-11 with 3/4˝ floats only
 010 – SPST, 10VA
 020 – SPST, 20VA
 050 – SPST, 50VA
 100 – SPST, 100VA
5. Wiring Group:
 Group 1 – Common Return
 Group 2 – Independent Return
6. Switch Actuation Level:
2. Electrical Connections:

Compatible
Mountings
Type Description
1
Lead Wires, 24" to 26" (610mm, Min.)
All
2
Cable, 24" to 26" (610mm, Min)
All
3
Liquid-Tight Cable Fitting
42
4
Junction Box Assembly
42
5
DIN43650 Plug Connector, 3 Poles
42
6
DIN43651 Plug Connector, 6 Poles
42
3. Float Type:
 Buna-N – P/N 39049  Polysulfone – P/N 39005
 Solid Foamed Polypropylene – P/N 119455
 Buna N – P/N 187553  Solid Foamed Polypropylene – P/N 197732
 Hollow Polypropylene – P/N 145730
Custom Length Float Type Level Switches
 Product Check List

Actuation
Level
Distance to Actuation Level*
Inches
Millimeters
SPST Switch
Operation**
(Check Type)
N.O.
N.C.
L4
L3
L2
L1***
* Measured from inner surface of mounting plug or flange.
See mounting types on page B-3.
** Switch position is “normal” with unit dry (tank empty).
*** L1 is the distance to the lowest actuation level with mounting “up,” and is the distance
to the highest actuation level with mounting “down.”
B. Length Overall _________________  Inches  Millimeters
Please contact GEMS Sensors Inc. for any configuration or special
requirements not covered on this form. 800-378-1600
Quote $ _________________
Date Quoted ____/____/____
Visit www.GemsSensors.com for most current information.
B-6
Small Size – Engineered Plastics
Ordering is Easy! See Page B-9.
Easy online ordering too!
LS-300TFE Series –
All-PTFE Wetted Parts for Ultra-Pure Fluids




Low Particle Generation-One piece Molded Design
Corrosion Resistant
1 to 4 Actuation Levels in a Single Unit
Lengths to 24 Inches
LEVEL SWITCHES – MULTI POINT
Typical Applications
•Semiconductor Process Equipment
•Pure Chemical Delivery System
•Wafer Cleaning and Etching Systems
•Cabinet Leak Sensing
1. Mounting Types
Each mounting type can be configured with stem lengths (LO) and float materials
indicated in this bulletin.
Type 11, No Mounting
Type 22, 1" NPT
3/8"
(9.4 mm)
1-3/8"
1-3/8" (35 mm) HEX
(35 mm) HEX
'LO'
'LO'
1" NPT
Type 24, 1/4" NPT
3/8"
(9.4 mm)
1"
1"
(25.4 mm)
(25.4 mm)
1" NPT
'LO'
'LO'
2. Electrical Connections
Type 1
Leadwire
Type 25, 3/8" NPT
35/64"
35/64" (13.72 mm)
(13.72 mm)
9/32"
9/32"
1/4" NPT
(7.11 mm)
3/8" NPT
1/4" NPT
(7.11 mm)
11/16"
11/16" (17.5 mm) HEX
(17.5 mm) HEX
'LO'
'LO'
35/64"
35/64" (13.72 mm)
(13.72 mm)
9/32"
3/8" NPT
9/32"
(7.11 mm)
(7.11 mm)
11/16"
11/16" (17.5 mm) HEX
(17.5 mm) HEX
'LO'
3. Float Types
Type 2
Cable
Type 3*
Liquid-Tight Cable
NYLON
1.12"
(28 mm)
MAX.
Float Material
Float Dimensions
PTFE
*Available on Mounting Type 22 only.
B-7
1"
(25.4 mm)
+32° F to +212° F
(0° C to 100° C)
-40° F to +250° F
(-40° C to 121° C)
Pressure, PSIG (bar), Max.
at Ambient Temperature
25
(1.7)
50
(3.4)
Min. Liquid Specific Gravity
0.90
0.86
Operating Temperature
#22 AWG Teflon• Wire
or
#24 AWG PVC Jacketed Cable
PVDF
1"
(25.4 mm)
1-1/4"
(318 mm)
1-1/8"
(28.4 mm)
Extended Leads
'LO'
Note: A single float type is selected for use at all actuation points.
Visit www.GemsSensors.com for most current information.
FLOAT TYPE
RED (2)
YELLOW (4)
YELLOW (3)
RED (1)
RED (2)
L4
Lead Wire
(*)
Group I Wiring: 1 to 4 Actuation Levels.
Group 2
YELLOW (3)
BLACK (1)
Group 1
BLUE (4)
Electrical Connection
Typically, one float is required for each point at which
you need a switch action to occur. The number of
actuation levels available depends on the Group Type
Wiring selected; see below.
BROWN (5)
4. Electrical Specifications
L3
L2
L2
Group II Wiring: 1 or 2 Actuation Levels.
L1
L1
LEVEL SWITCHES – MULTI POINT
WHITE (4)
GREEN (3)
RED (2)
L4
Cable
(*)
BLACK (1)
RED (2)
GREEN (3)
WHITE (4)
Notes:
1. Other wiring options available. Consult factory.
2. Consult Factory for load information.
BROWN (5)
BLACK (1)
Switch (SPST, N.O. or N.C.): 10/20/50/100VA.
L3
L2
L2
L1
L1
*Pin correlation of plug connectors shown in parenthesis.
5. Actuation Level Dimensions
* Actuation level distances
and L0 (overall unit
length) are measured
from inner surface of
mounting. See mounting
types on opposite page
for L0 reference point.
**Length Overall (L0) = L1 +
Dimension D.
L0max. = 24˝.
L4
L3
L2
A MIN
ACTUATION
LEVEL
L1
L0
Switch actuation levels are determined following the guidelines below.
A = Minimum distance from highest actuation level to bottom of mounting.
B = Minimum distance between actuation levels.
C = Minimum distance between two actuation levels with one float (Note: One float for
two levels can be used only when low level is N.C. dry and high level is N.O. dry).
D =Minimum distance from end of unit to lowest level.
B MIN
ACTUATION
LEVEL
Float
Material
ACTUATION
LEVEL
C MIN
ACTUATION
LEVEL
D MIN
5/16" DIA. REF
(7.9 mm)
inch
mm
Dimensions
A
B
C
D
PTFE
1-3/4
44.5*
__2__
50.8
_1/8_
3.2
1-5/8
41.3
PVDF
1-3/4
44.5*
__2__
50.8
_1/8_
3.2
1-7/16
36.5
*Mounting Type 22 (1˝ NPT) requires a minimum “A” dim. of 2-1/16˝ (52.4mm)
Visit www.GemsSensors.com for most current information.
B-8
Custom Length Float Type Level Switches
 Product Check List

This is a  Request for a Quote
 Order P.O.#_______
Quantity Needed _____________
Photocopy This Form
Use one form for each product
type you are selecting.
This form may also be completed online at
gemssensors.com for RFQ.
Date Required ____/____/_____
Shipping Method:_____________
Partials Accepted: Yes
 No
Name ___________________________________________
Company _________________________________________
Street ___________________________________________
City________________________ State_____ Zip__________
Phone ( _____ ) ___________________________________
Fax ( _____ ) ______________________________________
LS-300TFE Custom Length Level Switches
Application Environmental Conditions
This information is essential to the accurate and proper operation of
your GEMS configurable sensors. Please complete fully and accurately.
1. Liquid Media: __________________________________________
5. Viscosity: __________________ SSU
2. Pressure: Minimum ___________ psigMaximum ____________
6. Tank Material: _________________________________________
3. Temperature: Minimum ________ °FMaximum ____________
4. Specific Gravity: Minimum _________
Maximum ____________
Product Parameters
1. Mounting Type:
Tank Depth: ___________________________________________
7. Unit is Mounted In:  Tank Top  Tank Bottom
5. Actuation Level Dimensions:
 Type 11 – No Mounting
A.
 Type 22 – 1˝ NPT
Actuation
Level
 Type 24 – 1/4˝ NPT
Distance to Actuation
Level – Inches*
 Type 25 – 3/8˝ NPT
N.O.
L4
2. Electrical Connections:
L2
N.C.
A MIN
ACTUATION
LEVEL
L1
B MIN
ACTUATION
LEVEL
L2
 Type 2, Cable
L1***
 Type 3, Liquid-Tight Cable
(Type 22 Mounting Only)
ACTUATION
LEVEL
* Measured from inner surface of mounting.
** Switch position is “normal” with unit dry (tank empty).
***L1 is the distance to the lowest actuation level with mounting “up,”
and is the distance to the highest actuation level with mounting
“down.”
3. Float Types:
 PTFE
B. Length Overall _________________ inches
 PVDF
Lead Wire Length:
4. Electrical Specifications:
A.
 Group I Wiring
 Group II Wiring
B.
 10 VA
 20 VA
 50 VA
 100 VA
 24˝
 Other:________________inches
Please contact GEMS Sensors Inc. for any configuration or special
requirements not covered on this form. 800-378-1600
Date Quoted:____/____/____
Additional minimum charges may apply on special orders.
B-9
L4
L3
L0
L3
 Type 1, Leadwire
Quote: $ _______________
SPST Switch
Operation**
(Check Type)
Visit www.GemsSensors.com for most current information.
C MIN
ACTUATION
LEVEL
D MIN
5/16" DIA. REF
(7.9 mm)
FLOAT TYPE
LS-350 Series
Combination Siphon and Level Sensor





Ordering is Easy! See Page B-13.
Easy online ordering too!
Multi-Level Switch Options
Up to 4 Actuation Points
Integral Siphon or Fill Tube
Customized Mountings
Custom Configurable
LEVEL SWITCHES – MULTI POINT
Save valuable space and costly installation/maintenance time with
these highly customizable sensors. LS-350 units combine a siphon
tube and up to four liquid level sensors as a single component. The
complete unit installs through a single opening in the fluid container.
Simple and clean — a single component that enables remote
monitoring of a tank’s fluid content while allowing access for
container filling and draining. These units are custom configured to
fit the container of your choice, with a wide range of mountings, fluid
and electrical connectors, materials and lengths.
Typical Applications
•Immuno-Chemistry/Cytology
•Hematology
•Automated Urine Analysis
•Laboratory Automation
Specifications
Materials
Stem and Mounting
Floats
Gasket
Operating Temperature
Buna N Float
Polypropylene Float
Switch
Length
Mounting Attitude
Actuation Level Points
Polysulfone or Noryl®
Polypropylene or Buna N
Buna N
221°F (105°C) Max.
210°F (99°C) Max.
SPST
15" (380 mm) Max., Longer units available on request
±30° from vertical
6 Max.
Operating Principle
The LS-350 Series provides two functions: liquid level monitoring and fluid fill or
extraction access. The latter function is accomplished with an integrated siphon
tube that runs parallel to the float sensor stem and through the top mounting; it
is commonly topped with a barb (or customer specified) fitting for the connection
of flexible tubing. Fluid level sensing is accomplished with magnetic reed switch
technology. One or more floats encircling a stationary stem are equipped with
powerful, permanent magnets. As a float rises or lowers with liquid level, the
magnetic field generated from within the float actuates a hermetically sealed magnetic
reed switch mounted inside the stem. The switch actuation may be used for alarm,
solenoid, pump or other fluid control operations.
Visit www.GemsSensors.com for most current information.
HI
MID
TOP
LO
Permanent
Magnet
Magnetic Field Actuates
Reed Switch
Float Stop Collar
SIDE
Float
Hermetically-Sealed
Magnetic Reed Switch
B-10
1. Mounting Types
3. Electrical Specifications
Each mounting type can be configured with stem lengths (LO) and as indicated below.
Typically, one float is required for each point at which
you need a switch action to occur. The number of
actuation levels available depends on the Group Type
Wiring selected; see below.
Type 1
Type 2
Flange is moveable, allowing stem Designed for consistant use in
and float position to be adjusted
same type of container. Buna N
when installed. May be bonded
gasket provides snug seal.
into set position if desired.
FLUID
TUBE
BARB
ELECTRICAL
CONNECTION
BUNA N
GASKET
L2
L1
L2
L1
Max Length (LO)
15 inches (38 cm) ±1/16˝ (2 mm)
Mounting Position
Mounting Compatibility
5. Electrical Connections
Vertical ±30° Inclination
Cubitainer Style Opening
®
Tank Wall Thickness 1/32˝-1/8˝
Type 1: Lead Wires, 24˝ to 26˝ (610 mm, Min.)
Type 2: Cable, 24˝ to 26˝ (610 mm, Min.)
2. Float Types
A single float type is used for all actuation points.
Buna N
Polypropylene
1/8˝ REF.
1.00
15/16˝
VIEW WITH FLOAT
REMOVED
BOTH TYPES
Part Number
Liquid Suitability
Min. Media Specific Gravity
Operating Temperature
1˝ DIA
1˝ DIA
128642
130893
Oil-Based
Water-Based
0.75
0.98
Oil: -40°F to +221°F
(-40°C to +105°C)
Water: to 180°F (82°C)
-40°F to +210°F
(-40°C to +99°C)
Visit www.GemsSensors.com for most current information.
RED (2)
YELLOW (3)
RED (2)
YELLOW (3)
L3
Compatible 3/16˝ I.D. Hose (Options available)
* Orientation of slot in flange is not critical.
B-11
RED (1)
L4
Group 2
BLUE (4)
1.31˝/1.32˝
(33.3 mm/33.5 mm)
Polysulfone with
Polysulfone
Buna N Gasket
Atmosphere (Not recommended for pressurized applications)
Group 1
BROWN (5)
5/16˝ DIA. REF.
(8 MM)
YELLOW (4)
LO
1.20˝/1.25˝
(30.5 mm/31.75 mm)
Fluid Barb
Notes:
1. Other wiring options available. Consult factory.
2. Consult Factory for load information.
4. Wiring Group
5/16˝ DIA. REF.
(8 MM)
5/16˝ DIA. REF.
(8 MM)
Stem, Mounting and
Collar Material
Pressure Rating (mounting)
Switch (SPST, N.O. or N.C.): 10/20/50/100 VA.
ELECTRICAL
CONNECTION
LO
5/16˝ DIA. REF.
(8 MM)
Mounting Hole Dia.
Group II Wiring: 1 or 2 Actuation Levels.
BLACK (1)
LEVEL SWITCHES – MULTI POINT
FLANGE*
FLUID
TUBE
BARB
Group I Wiring: 1 to 4 Actuation Levels.
FLOAT TYPE
6. Actuation Level Dimensions
Type 1
Type 2
Actuation
Levels*–Typical
Actuation
Levels*–Typical
L4
L4
A
A
L3
L3
B
LO
L2
LO
C
L1
C
L1
D
D
* Actuation level distances and LO (overall unit length) are measured
from inner surfaces of mounting plug or flange. See mounting types
on page B-11 for LO reference point.
** Length Overall (LO) = L1 + Dimension D. See Mounting Types for
Maximum Length values.
Switch actuation levels are determined following the guidelines below.
A =Minimum distance to highest actuation level.
B =Minimum distance between actuation levels.
C =Minimum distance between two actuation levels with one float (Note: One float for two levels can be used only when low level is N.C. dry and high level is N.O. dry).
LEVEL SWITCHES – MULTI POINT
L2
B
D =Minimum distance from end of unit to lowest level.
Dimensions
Float Type
A
Type 1 Mount Type 2 Mount
Buna N
Polysulfone
3/4˝
(19 mm), Min.
1/2˝
(13 mm), Min.
3/4˝
(19 mm)
1/2˝
(13 mm)
B
C
D
1-3/4˝
(45 mm)
1-3/4˝
(45 mm)
1/8˝
(3 mm)
Minimum
15/16˝
(24 mm)
1-3/16˝
(30 mm)
Notes:
1. Actuation levels are calibrated on ascending fluid level with water, specific gravity 1.0, as the calibrating
fluid, unless otherwise specified.
2. Tolerance on actuation levels is ±1/8˝ (3 mm).
Visit www.GemsSensors.com for most current information.
B-12
 Product Check List

This is a  Request for a Quote
 Order P.O.#_______
Quantity Needed _____________
Photocopy This Form
Use one form for each product
type you are selecting.
This form may also be completed online at
gemssensors.com for RFQ.
Date Required ____/____/_____
Shipping Method:_____________
Partials Accepted: Yes
 No
Name ___________________________________________
Company _________________________________________
Street ___________________________________________
City________________________ State_____ Zip__________
Phone ( _____ ) ___________________________________
Fax ( _____ ) ______________________________________
LS-350 Engineered Plastics Custom Length with Siphon
Tube Float Type Level Switch Check List
Application Environmental Conditions
This information is essential to the accurate and proper operation of
your GEMS configurable sensor. Please complete fully and accurately
before ordering.
1. Liquid Media: __________________________________________
5. Viscosity: __________________ SSU
 psig
2. Pressure: Minimum ___________ Maximum
__________
bar
 °F
 °F
°
3. Temperature: Minimum _______ Maximum
__________  °C
C
6. Tank Material: _________________________________________
4. Specific Gravity: Minimum ______
7. Unit is Mounted In:  T – Top Mounted  B – Bottom Mounted
Maximum __________
1. Mounting Type:
Tank Depth: ___________________________________________
6. Switch Actuation Level:
 Type 1 (Standard)
 Type 2
Actuation
Level
2. Float Type:
Distance to Actuation Level*
Inches
Millimeters
SPST Switch
Operation**
(Check Type)
N.O.
 Buna-N – P/N 128462
 Solid Foamed Polypropylene – P/N 130893 (Standard)
N.C.
L4
L3
3. Electrical Rating:
 010 – SPST, 10VA
 020 – SPST, 20VA
 050 – SPST, 50VA
 100 – SPST, 100VA
4. Wiring Group:
 Group 1 – Common Return
 Group 2 – Independent Return
L1***
* Measured from inner surface of mounting plug or flange.
See mounting types on page B-11.
** Switch position is “normal” with unit dry (tank empty).
*** L1 is the distance to the lowest actuation level with mounting “up,” and is the distance
to the highest actuation level with mounting “down.”
B. Length Overall _________________  Inches  Millimeters
5. Electrical Connections:

L2
7. Barb Fitting:
Type Description
 3/16" (Standard)
1
Lead Wires, 24" to 26" (610mm, Min.)
2
Cable, 24" to 26" (610mm, Min)
 Other_____________________________________________
Please contact GEMS Sensors Inc. for any configuration or special
requirements not covered on this form. 800-378-1600
Quote $ _________________
B-13
Date Quoted ____/____/____
Visit www.GemsSensors.com for most current information.
FLOAT TYPE
Small Size – Alloys
Ordering is Easy! See Page B-17.
Easy online ordering too!
LS-700 Series Combines Durability of Metal
With a Compact Design for Restricted Spaces
 Stainless Steel or Brass Mountings and Stems
 1 to 5 Actuation Levels
 Lengths to 48 inches
These compact units feature the rugged durability of stainless steel or
brass construction in a lightweight package. Ideal for tanks less than
4 feet.
LEVEL SWITCHES – MULTI POINT
°F
LS-700 Series switches are exceptionally versatile because of the many
useful options available. Described briefly below, these options can
extend the functionality of your GEMS LS-700 Series custom switch.
Temperature Sensing
To save space and simplify wiring, GEMS can
incorporate a temperature sensor in the end of
the float stem on any model type LS-700.
Two sensor types are available: Transducers for
continuous output, and Thermostats for switch
actuation. See Page B-25 for details.
°F
Solid-State Relays
Control motors, pumps, valves and other “load” devices
with GEMS Solid-State Relays. Intrinsically-safe relays
and barriers allow safe operation of level switches in
hazardous areas. See Section I for details.
Factory Mutual Approved Explosion Proof
LS-700-EP Series offers 1 to 5 actuation levels
with lengths to 48˝ for use in hazardous locations.
Call Gems factory for details.
FM
Type 1
1/8˝ NPT
1. Mounting Types
Type 2
3/4˝ NPT1
1-1/16˝ HEX
Each mounting type can be configured with stem lengths
(LO) and float material indicated in this table.
Type 3
1˝ NPT1
1-5/16˝ HEX
1/2˝ HEX
Type 4
3-5/8˝ Dia. Flange
BOLT
CIRCLE
3˝ DIA.
(76.2 mm)
3-5/8˝ DIA.
(92.1 mm)
Note:Sanitary flange mountings are also available, but not shown.
Please contact factory.
Type 5
1-5/16-12UNF-2A
Type 6
3/8-24
Type 7
1-1/4˝ NPT1,2
5/16˝ DIA. (7.9 mm)
THRU (6) HOLES
1-1/2˝ HEX
1/2˝ HEX
1/8˝ NPT
3/16˝
(4.8 mm)
1˝ SQ.
(25.4 mm)
NEOPRENE
O-RING
Stem and Mounting
Material
Max Length
Mounting Position
3
Float Stops
Pressure Rating,
PSI, Max.4
Brass or 316 Stainless Steel
48 inches (121.9 cm) – 21˝ Max On Bent Stem Versions (Consult Factory)
Vertical ± 30° Inclination
Brass Units: Beryllium Copper Grip Rings; Stainless Steel Units: S.S. ARMCO PH-15-7MO Grip Rings
See Float Value on Following Page
50
Notes: 1. Mounting Types 2, 3 & 7 are available with a 1/2˝ MNPT conduit adaptor. This option can be selected on the checklist.
2. Mounting Type 7 is not U.L. Approved.
3. In some instances, concentrations of chlorine and other corrosive compounds in the media require the use of collar type float stops. Consult factory for details.
4. Mounting only. Maximum pressure rating for complete unit will be the lower of this pressure or the selected float pressure (see Float Types, on next page).
Mounting Options and Float Selection on following pages.
Visit www.GemsSensors.com for most current information.
B-14
2. Float Types
Optional
Mountings
A single float type is selected for use at all actuation points.
Please contact Gems
Sensors about these
mountings or other
requirements not seen
here.
Bent Stem (LS-77700)
Used when tank top or
bottom is inaccessible.
Float Materials
Buna N
Compatible Mounting Types
1, 2, 3, 4, 5, 6, 7
1, 3, 4, 5, 6, 7
LEVEL SWITCHES – MULTI POINT
39049
Oil: -40°F to +300°F
(-40°C to 149°C)
Pressure, PSI, Max.
300*
Integral Receptacle
2-5 Pin miniature
receptacle for mounting
Type 2 or
Type 3;
eliminates
splicing
and eases
connections.
0.70
0.50
1˝
133764
145730
-40°F to +300°F
(-40°C to +149°C)
-40°F to +225°F
(-40°C to +107°C)
1000*
50 PSI @ 70°F*
0.65
0.60
*De-rated with increasing temperature above 70°F (21°C).
3. Number of Actuation Levels and Electrical Specifications
Typically, one float is required for each point at which
you need a switch action to occur. The number of
actuation levels available depends on the Group Type
Wiring selected; see below.
Group I Wiring: 1 to 5 Actuation Levels.
A 1/2˝ MNPT conduit is
available for Mounting
Type 2 & 3. Select from
list of options on the
Check List.
1-1/6˝
SPRING BIAS
29/32˝ DIA.
(23.0 mm)
Water: to 180°F (82.2°C)
Min. Liquid Specific Gravity
1-3/32˝
(27.8 mm)
1˝ DIA.
(25.4 mm)
187553
Operating Temperature
Conduit Adapter
Wiring Color Code
Tinted area designates U.L. Recognized wiring
configurations.
Group II Wiring: 1 to 3 Actuation Levels.
Switch (SPST, N.O. or N.C.): 20 /100 VA.
Lead Wires: #22 AWG, 24˝ L., PTFE.
Approvals: LS-700 Series switches are U.L.
Recognized – File No. E45168;
CSA Listed – 30200.
Typical Wiring Diagrams
For clarity, only two actuation levels are shown in each
group diagram.
GROUP I
SPST
GROUP II
SPST
SPST Switches
Wiring
Group I
Group II
Common
Wire
Black
None
NO/NC
SW Com.
NO/NC
L1
Red
Red
Red
L2
Yellow
Yellow
Yellow
L3
Blue
Blue
Blue
L4
Brown
L5
Orange
Notes:
1. Units with 100 VA switches are not U.L. Recognized or CSA Listed.
2. See “Electrical Data” on Page X-5.
Factory Mutual Approved Explosion-Proof
For Hazardous areas give Gems a call and ask about the
LS-700-EP Series. These custom-length sensors provide
up to 5 actuation levels, with lengths up to 48˝. Multiple
mounting, float and material options. 800-378-1600
FM
B-15
1, 2, 3, 4, 5, 6, 7
15/16˝
(23.8 mm)
3/4˝
19
Part Number
Polypropylene
1, 3, 4, 5, 6, 7
1.10˝
28
Float Dimensions
PTFE – Spring Biased
Visit www.GemsSensors.com for most current information.
FLOAT TYPE
316 Stainless Steel**
1-7/32˝
(30.9 mm)
1˝
(25.4 mm)
1-1/2˝ DIA.
(38.1 mm)
1, 4, 5, 6, 7
1-1/8˝
(28.6 mm)
N.O.
1-1/32˝ DIA.
(26.2 mm)
60241
141750
1, 2, 3, 4, 5, 6, 7
1.17˝ DIA.
(30 mm)
156900
1, 2, 3, 4, 5, 6, 7
1-19/32˝
(40.5 mm)
1-19/32˝
(40.5 mm)
29/32˝ DIA.
(23.0 mm)
29/32˝ DIA.
(23.0 mm)
136550
158369
-40°F to +300°F
(-40°C to +149°C)**
100
275
600
400
150
0.70
0.85
0.90
1.10
.85
** 316 Stainless Steel floats are available with ceramic potting that allows
temperatures to 400°F (204°C); contact factory for these high-temperature applications.
4. Actuation Level Dimensions
Switch actuation levels are determined following the guidelines below.
Actuation
Levels*–Typical
A =Minimum distance to highest actuation level.
B =Minimum distance between actuation levels.
LEVEL SWITCHES – MULTI POINT
1, 3, 4, 5, 6, 7
N.C.
1, 4, 6
C =Minimum distance between two actuation levels with one float (Note: One float for two levels can be used only when low level is N.C. dry and high level is N.O. dry).
L5
D =Minimum distance from end of unit to lowest level.
L4
Dimensions
A
L3
L2
B
L1
LO
(LENGTH
OVERALL)**
C
D
* Actuation level distances and LO (overall unit length) are measured
from inner surfaces of mounting plug or flange.
** Length Overall (LO) = L1 + Dimension D. See Mounting Types for
Maximum Length values.
Float
Part Number
A
39049
7/8˝ (22.2 mm)
1-3/4˝ (44.4 mm)
3/4˝ (19.1 mm)
60241
3/4˝ (19.1 mm)
1-13/16˝ (46.0 mm)
15/16˝ (23.8 mm)
133764
15/16˝ (23.8 mm)
1-7/8˝ (47.6 mm)
7/8˝ (22.2 mm), N.O.
1-3/16˝ (30.2 mm), N.C.
136550
9/16˝ (14.3 mm)
2-7/16˝ (61.9 mm)
141750
13/16˝ (20.6 mm)
2˝ (50.8 mm)
145730
7/8˝ (22.2 mm)
1-7/16˝ (36.5 mm)
156900
3/4˝ (19.1 mm)
1-7/8˝ (47.6 mm)
1-1/16˝ (27.0 mm)
158369
13/16˝ (20.6 mm)
2-7/16˝ (61.9 mm)
1-7/16˝ (36.5 mm).
187553
11/16˝ (17.5 mm)
1-7/16˝ (36.5 mm)
7/8˝ (22 mm)
B
C
1/8˝
(3.2 mm)
Min.
D
1-3/4˝ (44.4 mm)
1-1/8˝ (28.6 mm)
7/8˝ (22.2 mm)
Notes:
1. A, B and D dimensions based on a liquid specific gravity of 1.0.
2. Tolerance on actuation levels is ±1/8˝ (3.2 mm).
3. For bent stem versions, please request drawing LS-77700.
Visit www.GemsSensors.com for most current information.
B-16
Custom Length Float Type Level Switches
 Product Check List

This is a  Request for a Quote
 Order P.O.#_______
Quantity Needed _____________
Photocopy This Form
Use one form for each product
type you are selecting.
Date Required ____/____/_____
Shipping Method:_____________
Partials Accepted: Yes
 No
This form may also be completed online at
gemssensors.com for RFQ.
Name ___________________________________________
Company _________________________________________
Street ___________________________________________
City________________________ State_____ Zip__________
Phone ( _____ ) ___________________________________
Fax ( _____ ) ______________________________________
LS-700 Types Custom Length Float Type Level Switches
Application Environmental Conditions
This information is essential to the accurate and proper operation of
your GEMS configurable sensors. Please complete fully and accurately.
1. Liquid Media: __________________________________________
5. Viscosity: __________________ SSU
2. Pressure: Minimum ___________ psigMaximum ____________
6. Tank Material: _________________________________________
3. Temperature: Minimum ________ °FMaximum ____________
Tank Depth: ___________________________________________
4. Specific Gravity: Minimum _________
Maximum ____________
1. Series Type:
5. Switch Actuation Level
A.
 LS-700
 TH-700 (Thermostat Equipped)
 TM-700 (Thermistor Equipped)
Actuation
Level
2. Mounting Type and Materials:
A. Mounting Type:
 Type 1
 Type 5
 Type 2
 Type 6
7. Unit is Mounted In:  Tank Top  Tank Bottom
Distance to Actuation
Level – Inches*
N.O.
 Type 3
 Type 7
 Type 4
L4
L3
L1***
3. Float Part Number:
Matching floats will be used at each actuation level specified.
* Measured from inner surface of mounting plug or flange.
** Switch position is “normal” with unit dry (tank empty).
*** L1 is the distance to the lowest actuation level with mounting “up,” and is the distance to the highest actuation level with mounting “down.”
B. Length Overall (Lo) _____________ inches.
4. Switch Type and Rating:
A.  Group I
 Group II
B.  SPST
C.  20 VA
 100 VA
6. Lead Wire Length:
 12˝  24˝  Other:_____________ inches.
Please indicate if using microprocessor/PLC load:  Yes  No
7. Options:
 Temperature Switch Settings (°F):  100  25  150
 175  200
On rising temperature, switch...  Opens  Closes
 Slosh Shield  Collars
 1/2˝ NPT Conduit Connection (available for Types 2, 3 & 7)
J-box Electrical Connection
 Explosion Proof Type (FM/CSA)
Please contact GEMS Sensors Inc. for any configuration or special
requirements not covered on this form. 800-378-1600
Date Quoted:____/____/____
Additional minimum charges may apply on special orders.
B-17
N.C.
L5
L2
B. Mount and Stem Material:
 Brass
 316 Stainless Steel
Quote: $ _______________
SPST Switch
Operation**
(Check Type)
Visit www.GemsSensors.com for most current information.
 NEMA 4 Type
FLOAT TYPE
Large Size – Engineered Plastics
Ordering is Easy! See Page B-26.
Easy online ordering too!
LS-800PVC Series –
Our Most Economical Large Size Unit
 NSF Approved All-PVC Wetted Parts Available
 1 to 7 Actuation Levels
 Lengths to 60 inches
LEVEL SWITCHES – MULTI POINT
Inexpensive, all-PVC LS-800PVC Series switches bring reliable level
sensing to corrosive liquids. These durable, yet economical, switches
use the same high-quality, dependable reed switches found in GEMS’
most expensive models. NSF-approved wetted parts make the
LS-800PVC suitable for potable water applications.
1. Mounting Types
Type 1
1/2" NPT
Type 3
2" NPT
Type 4
3", 150# Flange
1/2" NPT
Mounting and All Wetted Parts
1/2" NPT
PVC
Operating Temperatures
0°F to 125°F (-17.8°C to 51.7°C)
Pressure, PSI, Max.
15 @ 70°F (21°C)
Max. Length (Lo)
60 inches (152.4cm)
Mounting Position
Vertical ±30° Inclination
2. Float Type
Float Material
Float Dimensions
PVC*
Buna N
1-13/16˝
(46.0 mm)
1-1/2˝ DIA.
(38.1 mm)
Float Part Number
Min. Liquid Specific Gravity
1-3/4˝
(44.4 mm)
1-11/64˝ DIA.
(29.7 mm)
16306
142251
0.85
0.80
*Select for potable water applications.
Visit www.GemsSensors.com for most current information.
B-18
LS-800PVC Series – Continued
3. Number of Actuation Levels and Electrical Specifications
Typically, one float is required for each point at which you need a switch action to occur. The
number of actuation levels available depends on type of wiring selected. See below.
Wiring Color Code
Group I Wiring: 1 to 7 Actuation Levels
Group II Wiring: 1 to 4 Actuation Levels
SPST Switches
Group III Wiring: 1 to 3 Actuation Levels
LEVEL SWITCHES – MULTI POINT
Group IV Wiring: 1 to 2 Actuation Levels
Switch (N.O. or N.C.):
Wiring
Group I
Group II
Group III
Group IV
Com.
Wire
Black
None
Black
None
NO/NC
SW.
Com.
NO/NC
NO
NC
SW.
Com.
NO
NC
L1
Red
Red
Red
Red
Wh/Red
Red
Wh/Red
Wh/Blk/Red
L2
Yellow
Yellow
Yellow
Yellow
Wh/Yel
Yellow
Wh/Yel
Wh/Blk/Yel
L3
Blue
Blue
Blue
Blue
Wh/Blue
L4
Brown
Brown
Brown
L5
Orange
SPST: 20 VA or 100 VA
SPDT: 20 VA
Lead Wires: #22 AWG, 24˝ L., PVC
Typical Wiring Diagrams
For clarity, only two actuation levels are shown in each
group diagram.
GROUP I
SPST
GROUP II
SPST
GROUP III
SPDT
GROUP IV
SPDT
SPDT Switches 20 VA
L6
Gray
L7
White
Notes: See “Electrical Data” on Page X-5 for more information.
4. Actuation Level Dimensions
Actuation
Level*– Typical
L7
Switch actuation levels are determined following the guidelines below.
L6
A = 1-1/2˝ (38.1 mm) Minimum distance to highest actuation level.
B = 2˝ (50.8 mm) Minimum distance from end of unit to lowest
actuation level.
C = 3˝ (76.2 mm) Minimum distance between actuation levels.
A
L5
Notes:
1. Actuation levels are calibrated on descending fluid level,
with water as the calibrating fluid, unless otherwise specified.
2. A and B dimensions based on a top mounted unit.
3. Float stops are permanently cemented in place.
4. Tolerance on actuation levels is ±1/8˝ (3.2 mm).
5. Dimensions based on a liquid specific gravity 1.0.
L4
L3
L0
(LENGTH
OVERALL)**
L2
C
B
L1
* Actuation level distances and LO (overall unit length) are measured from
inner surfaces of mounting plug or flange.
** Length Overall (LO) = L1 + Dimension B. See Mounting Types for Maximum
Length values.
B-19
Visit www.GemsSensors.com for most current information.
FLOAT TYPE
Large Size – Engineered Plastics
Ordering is Easy! See Page B-26.
Easy online ordering too!
LSP-800 Series –
Features Inert Materials for Corrosive Liquids
 All-Plastic Wetted Parts ‑ PVC, Polypropylene or PVDF
 1 to 6 Actuation Levels
Specifically designed for corrosive liquids and vapors. Three
standard model types in a choice of materials offer broad chemical
compatibility.
1. Mounting Types
Each mounting type can be configured with stem lengths (LO) and materials indicated
in the table below. Floats and float stop collars are of same material specified for
mounting.
1" NPT
Type A
Type B
3" NPT
Type C
3", 150# Flange
1/2" NPT
1-3/8" HEX (PVC)
1-3/16" HEX
(PP OR PVDF)
3-3/8" REF.
(85.7 mm)
2-5/8" REF.
(66.6 mm)
1-1/8" REF.
(28.6 mm)
1/2" NPT
1/4" REF.
(6.3 mm)
1-11/16" REF.
(42.9 mm)
1-1/8" REF.
(28.6 mm)
Stem, Mounting, Float
and Collar Material
LEVEL SWITCHES – MULTI POINT
 Lengths to 70 inches
PVC, Polypropylene or PVDF
Max. Length (L0)
70 inches (177.8 cm)
Vertical ±30° Inclination
Mounting Position
2. Float Types
Float Material
PVC
Polypropylene
2.28"
(58 mm)
Float Dimensions
2.84" Dia.
(72 mm)
Operating Temperature
and Pressure
Min. Liquid Specific
Gravity
PVDF
2.28"
(58 mm)
2.84" Dia.
(72 mm)
2.28"
(58 mm)
2.84" Dia.
(72 mm)
See Ratings Chart at top of following page
0.60
0.40
0.75
Note: Floats are always supplied in same material as specified for mounting.
Visit www.GemsSensors.com for most current information.
B-20
LSP-800 Series – Continued
Temperature and Pressure Ratings Chart
Maximum Pressure vs. Temperature
Operating Temperature
LEVEL SWITCHES – MULTI POINT
LSP-800
Material
0°F
(-17.7°C)
70°F
(21.1°C)
100°F
(37.7°C)
125°F
(51.7°C)
140°F
(60.0°C)
170°F
(76.6°C)
200°F
(93.3°C)
210°F
(98.8°C)
PVC
50 PSI
(3.4 bar)
50 PSI
(3.4 bar)
35 PSI
(2.4 bar)
20 PSI
(1.4 bar)
10 PSI
(0.68 bar)
X
X
X
Polypropylene
50 PSI
(3.4 bar)
50 PSI
(3.4 bar)
40 PSI
(2.7 bar)
35 PSI
(2.4 bar)
30 PSI
(2.0 bar)
25 PSI
(1.7 bar)
X
X
PVDF
50 PSI
(3.4 bar)
50 PSI
(3.4 bar)
45 PSI
(3.1 bar)
40 PSI
(2.7 bar)
35 PSI
(2.4 bar)
30 PSI
(2.0 bar)
25 PSI
(1.7 bar)
25 PSI
(1.7 bar)
3. Electrical Specifications
Wiring Color Code
Switch (N.O. or N.C.):
SPST: 20 VA or 100 VA
SPDT: 20 VA
SPST Switches
Lead Wires: #22 AWG, 24˝ L., Polymeric
Typical Wiring Diagrams
For clarity, only two actuation levels are shown in each
group diagram.
GROUP I
SPST
GROUP II
SPST
GROUP III
SPDT
GROUP IV
SPDT
SPDT Switches 20 VA
Wiring
Group I
Group II
Group III
Group IV
Com.Wire
Black
None
Black
None
NO/NC
SW.
Com.
NO/NC
NO
NC
SW.
Com.
L1
Red
Red
Red
Red
Wh/Red
Red
L2
Yellow
Yellow
Yellow
Yellow
Wh/Yel
Yellow
Wh/Yel
Wh/Blk/Yel
L3
Blue
Blue
Blue
Blue
Wh/Blue
Blue
Wh/Blu
Wh/Blk/Blu
Brown
Brown
Brown
Brown
Wh/Brn
Brown
Wh/Brn
Wh/Blk/Brn
Orange
Orange
Orange
Orange
Wh/Orn
Orange Wh/Orn
Wh/Blk/Orn
L6
Gray
Gray
Gray
Gray
Wh/Gra
Switch actuation levels are determined following the
guidelines below.
A
L5
L4
L3
D
L2
L1
LO
(LENGTH
OVERALL)**
C
BOTTOM
SUPPORT†
7/16"
1/4" B
7/8"
A = 2-1/16˝ (52.4 mm) ±1/16˝ minimum distance to
centerline of float (ref. mounting).
B = 2-11/16˝ (68.3 mm) ±1/16˝ minimum distance to
centerline of float (ref. stem end).
C = 3-1/2˝ (88.9 mm) minimum distance between
actuation levels.
D =Distance between actuation levels using one float.
Minimum = 1/4˝ (6.3 mm)
Maximum = 3-1/2˝ (88.9 mm)
Notes:
1. The centerline of the float is used as a standard reference for
actuating the switches.
2. All levels are set on descending float travel with overtravel = 1/4˝
(6.3mm) ±1/8˝ (3.2mm).
Overtravel on Ascending = 1/8˝ (3.2mm) min.
3. Tolerance on all actuation levels is ±1/8˝ (3.2 mm) Ref.
* Actuation level distances and LO (overall unit length) are measured
from inner surfaces of mounting plug or flange.
**Length Overall LO = L1 + Dimension B. See Mounting Types for
Maximum Length values.
† Bottom support recommended for units longer than 36 inches, or in
applications having turbulent conditions.
B-21
Wh/Red Wh/Blk/Red
L5
4. Actuation Level Dimensions
L6
NC
L4
Notes: See “Electrical Data” on Page X-5 for more information.
Actuation Levels* ‑ Typical
NO
Visit www.GemsSensors.com for most current information.
Gray
Wh/Gra
Wh/Blk/Gra
FLOAT TYPE
Large Size – Alloys
Ordering is Easy! See Page B-26.
Easy online ordering too!
LS-800 Series –
The General Purpose Workhorse for Water and Oils
 Stainless Steel or Brass Mountings
ved
UL Appro roof
-P
n
io
s
Explo
 1 to 6 Actuation Levels
 Lengths to over 11 feet (3.4 m)
Rugged construction and multiple options provide the LS-800 Series
with exceptional versatility. Longer and more substantial than other
metallic models, the LS-800 is capable of supporting larger, more
buoyant floats, and is physically stronger for better reliability in
contaminated or turbulent media. This series offers SPST or SPDT
switches, and a choice of mountings, floats and materials that can be
configured for a wide range of applications in water, oils, chemicals and
corrosive liquids.
LEVEL SWITCHES – MULTI POINT
 CSA Listed
°F
Temperature Sensing
°F
To save space and simplify wiring, GEMS can
incorporate a temperature sensor in the end of the
float stem on any model type LS-800. Two sensor
types are available: Transducers for continuous output, and
Thermostats for switch actuation. See Page B-25 for details.
Adjustable Mounting
Allows stem to travel up and down for fine
tuning your actuation points. See next page.
LS-800 switches are U.L. Approved for Class I,
Division 2, Groups B, C, D hazardous locations
They are also available with FM-approved,
explosion-proof junction box for Class I, Division 1, Group
D hazardous locations (Type 1 mounting excluded). Units
must be specified with stainless steel floats and be assembled
completely at GEMS.
Type 4
3˝, 150# Dia. Flange
1. Mounting Types
Each mounting type can be configured with stem lengths (LO) and float material
indicated in the table below. Mountings are also continued on following page.
Note:Sanitary flange mountings are also available, but not shown. Please contact factory.
Type 1 mounting not FM approved.
Type 1
1/2˝ NPT†
°F
1/2˝ NPT
°F
Type 2
1-1/4˝ NPT
3/4˝ DIA.
(19.0 mm)
Type 3
2˝ NPT
1/2˝ NPT
°F
BOLT
CIRCLE
6˝ (152.4 mm)
°F
1/2˝ NPT
7-1/2˝ DIA.
(190.5 mm)
1-1/4˝ SQ.
(31.8 mm)
1˝ SQ.
(25.4 mm)
1/2˝ N.P.T.
1˝
(25.4 mm)
Stem and Mounting Material
Max Length (Lo)
Mounting Position
Float Stops*
Brass or 316 Stainless Steel
36˝ (91.4 cm)
60˝ (152.4 cm)
Flange: Carbon Steel or 316 S.S.
Stem: 316 S.S.
140˝ (355.6 cm)
Vertical ± 30° Inclination
Brass Units: Beryllium Copper Grip Rings; Stainless Steel Units: S.S. ARMCO PH-15-7MO Grip Rings
* Units greater than 72˝ overall length are supplied with collars with setscrews (made of same material as stem and mounting) in place of float-stop rings. Collars are optional on units
less than 72˝ overall length. Units requiring 316 SS float stops must be special ordered with 316 SS collars instead of grip rings. In some instances, concentration of chlorine and other
corrosive compounds in the media require the use of collar type float stops. Consult factory for details.
† Type 1 mounting not FM approved.
Visit www.GemsSensors.com for most current information.
B-22
LS-800 Series – Continued
1. Mounting Types – continued
Type 5 External Mounting
units are ideal for tanks
with limited access to tops
or bottoms.
LS-800-A Series
Adjustable Mounting
Type 5
External Mount, Multi-Station
0-RING
1/2˝ FNPT
2-1/4˝-12 UNF-2A
THR'D
2-5/8˝
(66.7mm)
DIA. REF.
UNIT LENGTH
Lo + 2˝
2˝ (50.8mm)
Housing Material
Brass
Stem and Mounting
Brass
316 Stainless Steel
Max. Length (Lo)
120˝ (305 cm)
Beryllium Copper
MAX.
ADJUST
FLOAT
STOP
Using Gems SAFE-PAK® relays and
barriers, these switches provide
automatic refills/pumpdown and are
intrinsically-safe without explosionproof housing and piping.
3/4˝ NPT
Float Stops*
MOUNTING
Intrinsically-Safe Relays
3/4˝ NPT PORTS (2X)
316 Stainless Steel
Port Sizes
UNION
Note: Maximum overall length is
limited to 72˝ with this option.
N.O.
N.C.
LEVEL SWITCHES – MULTI POINT
Available for LS-800 Series
Mounting Types 2, 3 and 4.
Special cinch-nut on
mounting allows stem to
travel up or down for fine
tuning the actuation points.
The extent of adjustment
depends on unit length and
distance from mounting to
highest float stop. When
ordering, specify “LS-800-A”
as Series Type.
1-3/4˝
(44.5mm)
Lo
±1/16˝
UNIT STEM
ADJUSTED
UPWARD
S.S. ARMCO PH-15-7 MO
* Units greater than 72˝ overall length are supplied with collars with setscrews (made of same material as
stem and mounting) in place of float-stop rings. Collars are optional on units less than 72˝ overall length.
Units requiring 316 SS float stops must be special ordered with 316 SS collars instead of grip rings. In some
instances, concentration of chlorine and other corrosive compounds in the media require the use of collar
type float stops. Consult factory for details.
2. Float Types
A single float type is selected for use at all actuation points. Be sure, by reviewing the table
below, that the desired float is compatible with the Mounting Type selected in Step 1.
Float Material
Buna N
Compatible
Mounting Types
2
1, 3, 4, 5
1-7/8˝
DIA.
(47.6 mm)
1-1/4˝
DIA.
(31.8 mm)
Part Number
26032
316 Stainless Steel
3, 4, 5
(Units >72˝)
1-13/16˝
(46.0 mm)
1-3/4˝
(44.5 mm)
Float
Dimensions
Operating
Temperature
Min. Media
Specific Gravity
See Section L
1, 3, 4, 5
(Units ≤72˝)
1-13/16˝
(46.0 mm)
2-3/32˝
(53.3 mm)
24864
0.55
15666
0.55
26032
0.75
10558
24864
150
4
0.75
0.80
14569
15666
138935
750
300
180
150
Brass
316 S.S.
180
100 @ 70°F (21°C)
150
Review the Compatible Mounting Type row in the “Float Types” table above this matrix for produceable mounting/float combinations.
Not all combinations implied by this Pressure Rating Chart are possible or recommended.
B-23
138935
-40°F to +300°F
(-40°C to +149°C)
Float Part Number
1, 2, 3
5
1.63˝ MAX. DIA.
(41.4mm)
2-1/16˝
(52.4 mm)
14569
Pressure Ratings Chart (PSI, Max.)
Mounting Type
1.36˝
(34.6mm)
2-11/16˝
(68.3 mm)
2-1/16˝
(52.4 mm)
Water: to 180°F (82°C)
Oil: -40°F to +230°F (-40°C to +110°C)
0.75
1, 3, 4
2˝
(50.8 mm)
1-7/8˝
DIA.
(47.6 mm)
10558
3, 4, 5
(Units >72˝)
Visit www.GemsSensors.com for most current information.
750
300
120
FLOAT TYPE
3. Electrical Specifications
Wiring Color Code
Switch (N.O. or N.C.):
SPST: 20 VA or 100 VA
SPDT: 20 VA
Tinted area designates U.L. Recognized wiring configurations.
Lead Wires: #18 AWG, 24˝ L., Polymeric (except as
noted in Wiring Color Code chart at right).
Approvals:LS-800 Series switches are
U.L. Recognized – File No. E45168;
CSA Listed – File No. 30200
Typical Wiring Diagrams
For clarity, only two actuation levels are shown in each
group diagram.
GROUP I
SPST
GROUP II
SPST
GROUP III
SPDT
GROUP IV
SPDT
Com.
Wire
SPDT Switches 20 VA
Group I
Group II
Group III
Group IV
Black
None
Black
None
NO/NC
SW.
Com.
NO/NC
NO
NC
SW.
Com.
L1
Red
Red
Red
Red
Wh/Red
Red
L2
Yellow
Yellow
Yellow
Yellow
Wh/Yel
Yellow
NO
NC
Wh/Red Wh/Blk/Red
Wh/Yel
Wh/Blk/Yel
L3
Blue
Blue
Blue
Blue
Wh/Blue
Blue
Wh/Blu
Wh/Blk/Blu
L4
Brown
Brown
Brown
Brown
Wh/Brn
Brown
Wh/Brn
Wh/Blk/Brn
L5
Orange
Orange
Orange
Orange
Wh/Orn
Orange Wh/Orn
Wh/Blk/Orn
L6
Gray
Gray
Gray
Gray
Wh/Gra
Gray
Wh/Gra
Wh/Blk/Gra
Notes:
1. Non-U.L. Recognized units (white areas) use #22 AWG, 24˝ L., PTFE Lead wires.
2. Units with 100 VA switches are not U.L. Recognized or CSA Listed.
3. See “Electrical Data” on Page X-5 for more information.
4. Actuation Level Dimensions
LEVEL SWITCHES – MULTI POINT
SPST Switches
Wiring
Switch actuation levels are determined following the guidelines below.
Actuation Levels* ‑ Typical
All units 72˝ or less LO with Stainless Steel or Buna N floats. Also any unit over 72˝ LO
with Buna N floats:
A=1-1/2˝ (38.1 mm) minimum distance to highest level (2˝, Type 5 only).
B=2˝ (50.8 mm) minimum distance from end of unit to lowest level.
C=3˝ (76.2 mm) minimum distance between levels.
D=1/4˝ (6.3 mm) minimum distance between actuation levels (Note: One float for
two levels can be used only when low level is N.C. dry and high level is N.O. dry).
L6
L5
A
L4
L3
LO
(LENGTH
OVERALL)
Types 1, 3, 4, and 5 units with stainless steel float, Part Number 15666:
A=1-5/8˝ (41.3 mm) minimum distance to highest level (2˝, Type 5 only).
B=2-1/2˝ (63.5 mm) minimum distance from end of unit to lowest level.
C=4˝ (101.6 mm) minimum distance between level.
D=1/4˝ (6.3 mm) minimum distance between actuation levels (Note: One float for
two levels can be used only when low level is N.C. dry and high level is N.O. dry).
D
L2
C
Notes:
1. A, B and C dimensions based on a liquid specific gravity of 1.0.
2. One float for two levels can be used only when 20VA switch is used.
3. Actuation levels are calibrated on descending fluid level, with water as the calibrating fluid,
unless otherwise specified.
4. Tolerance on actuation levels is ±1/8˝ (3.2 mm).
5. TH (Temperature option) makes "B" dimension a minimum of 2.75˝ (69.8 mm).
L1
B
* Actuation level distances and LO (overall unit length)
are measured from inner surfaces of mounting plug or flange.
**Length Overall LO = L1 + Dimension B.
See Mounting Types for Maximum Length values.
Visit www.GemsSensors.com for most current information.
B-24
Optional Integrated Temperature Sensors
LEVEL SWITCHES – MULTI POINT
Compatible with LS-700 and LS-800 Series Units
Thermostat Switches or Thermistor Versions
Advantages of integrated temperature sensors:
• Space Saving.
• Fewer intrusions into the tank.
• Electrical wiring emanates from a single source –
eliminate multiple conduits.
• Economical – typically less expensive than separate sensors.
Look for units in this catalog with the temperature sensor icon:
°F
Control
heating
elements
and liquid
level with
a single
sensor.
°F
Thermistor for Continuous Indication –
TM-800 and TM-700
• Excellent repeatability.
Value: 10,000 ohms @ 77°F (25°C)
Tolerance: ±0.2°C from 32°F to 158°F (0°C to 70°C)
Operating Temperature: 302°F (150°C), Max.
Alpha @ 25°C: -4.39%/°C
Dissipation Constant: 1 mW/°C in Still Air;
8mW/°C in Oil Bath.
T
GROUP I
How to Order
Temperature thermistors are available on LS-700 Series units with up to three
actuation levels, and on LS-800 Series units with up to five actuation levels. To have
thermistor added, order model TM-800 or TM-700.
T
GROUP II
Note: This option is not CE Approved.
Thermostat for Switch Actuation
• Standard Settings from 100°F to 200°F.
• Open or close switch on increasing temperature.
Use these switches to set off High/Low temperature alarms. Or, combine with GEMS
relays to control tank heating and cooling, motor-operated valves, etc.
To designate the thermostat switch option, order model TH-700 or TH-800.
Also specify the choice from selections A, B and C below.
A. Switch Rating:
For LS-800 Series: 6A/120V, 4A/240V, 100VA
(non-inductive).
For LS-700 Series: 2.6A/120V (inductive).
B. Contact Operation on Increasing Temperature:
“Opens” when Set Point reached or “Closes” when Set Point reached.
C. Standard Temperature Set Point (±7.2°F; ±4°C):
100°F (37.7°C), 125°F (51.6°C), 150°F (65.6°C), 175°F (79.4°C), 200°F (93.3°C)
Note:
1. Other temperature settings and tolerances available; 25 piece minimum order quantity applies.
Please call GEMS Sensors Inc. for more information.
2. This option is not CE Approved.
B-25
TEMPERATURE
SENSOR
ASSEMBLY
BOTTOM OF
UNIT
Note: End of unit stem
must be submerged a
minimum of 2-3/4˝ for
level switch actuation.
Typical Wiring Diagram
BLACK
BLACK
RED
RED
GREEN
GREEN
GROUP I
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GROUP II
This is a  Request for a Quote
 Order P.O.#_______
Quantity Needed _____________
Photocopy This Form
Date Required ____/____/_____
Use one form for each product
type you are selecting.
Shipping Method:_____________
Partials Accepted: Yes
 No
This form may also be completed online at
gemssensors.com for RFQ.
Name ___________________________________________
Company _________________________________________
Street ___________________________________________
City________________________ State_____ Zip__________
Phone ( _____ ) ___________________________________
Fax ( _____ ) ______________________________________
LS-800 Types Custom Length Float Type Level Switches
Application Environmental Conditions
This information is essential to the accurate and proper operation of
your GEMS configurable sensors. Please complete fully and accurately.
1. Liquid Media: __________________________________________
5. Viscosity: __________________ SSU
2. Pressure: Minimum ___________ psigMaximum _________ psig
6. Tank Material: _________________________________________
3. Temperature: Minimum ________ °FMaximum ___________°F
Tank Depth: ___________________________________________
4. Specific Gravity: Minimum _________
Maximum ____________
1. Series (Page No.):
 LS-800PVC (B-18)
 LSP-800 (B-20)
 LS-800 (B-22)
7. Unit is Mounted In:  Tank Top  Tank Bottom
7. Switch Actuation Level
A.
Actuation
Level
 LS-800-Adjustable (B-23)
 TM-800 (B-25. Thermistor Equipped)
 TH-800 (B-25. Thermostat Equipped)
See product page number for available mounting type and materials.
 Type B
 Type 2
 Type 5
 Brass
 PVC
 316 Stainless Steel
 Polypropylene
 PVDF
 Carbon Steel (Flanges Only, in
association with stainless steel stems.)
L13
Notes:
1. Measured from inner surface of mounting plug or flange.
2. Switch position is “normal” with unit dry (tank empty).
3. L1 is the distance to the lowest actuation level with mounting “up,” and is the
distance to the highest actuation level with mounting “down.”
4. Float stops are standard; see B-24 for specifications.
B. Length Overall (L0) ______________ inches (customer supplied
 12˝
Matching floats will be used at each actuation level specified.
6. Switch Type and Rating:
A.  Group I
 Group II
L2
8. Lead Wire Length:
 Tank Bottom
L3
support bracket assembly recommended for lengths over 72˝.)
5. Float Part Number:
B.  SPST
N.C.
L5
 Type C
 Type 3
4. Mounting Position:
 Group III*
N.O.
L4
3. Mounting and Stem Material (if choice available):
 Tank Top
SPST Switch Operation2
(Check Type)
L6
2. Mounting Type:
 Type A
 Type 1
 Type 4
Distance to Actuation Level
(Inches)1
Custom Length Float Type Level Switches
 Product Check List

 Group IV*
 SPDT*
C.  20 VA
 100 VA (SPST only)
Please indicate if using microprocessor/PLC load:  Yes  No
* Not Available on the TM-800 Series.
 24˝
 Other:_____________________ inches.
Options:
 Temperature Switch Settings (°F):  100  25  150
 175  200
On rising temperature, switch...  Opens  Closes
 Slosh Shield
 316 SS (316 SS units only)
 Brass (Brass units only)
J-Box Electrical Connection:
 Explosion Proof Type (FM/CSA)*
 NEMA 4 Type
 Plastic ABS Type
* Requires stainless steel floats
Please contact GEMS Sensors Inc. for any configuration or special
requirements not covered on this form. 800-378-1600
Quote: $ _______________
Date Quoted:____/____/____
Additional minimum charges may apply on special orders.
Visit www.GemsSensors.com for most current information.
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