Switch-Tek™
Horizontal, Vertical & Float-Point Float Switches
AV16, AV26, AV36, AV46, AV56, LH25, LH29, LH35, LV20, LV21, LV35 & LV36
Series Manual
Flowline, Inc. | 10500 Humbolt Street, Los Alamitos, CA 90720 p 562.598.3015 f 562.431.8507 w flowline.com MN801839 Rev B1
Table of Contents Step One
Introduction: ...................................................................................................................... 3
Technology: ...................................................................................................................... 3
Installation: ........................................................................................................................ 4
Vertical Mounted Switches: ................................................................................... 4
Horizontal Mounted Switches: .............................................................................. 4
Environmental: .................................................................................................................. 5
Dimensions: .......................................................................................................... 5
Material Compatibility: ........................................................................................... 6
Electrical interface: ......................................................................................................... .. 7
Typical Current and Voltage Ratings: ................................................................... 7
AV_6 Series Float and Wire key: .......................................................................... 8
Specification: ......................................................................................................... 9
Maintenance: ................................................................................................................ 10
Cautions: ............................................................................................................. 10
Testing the Installations: ..................................................................................... 10
Cleaning Procedure: ........................................................................................... 11
| 2 MN801839 Rev B1
Introduction/Technology Step Two
INTRODUCTION
1. Switches should be installed rigidly so the float or floats are free to move as the liquid level changes.
2. Switches should be mounted in a tank area free of severe turbulence or protected from such turbulence
by appropriate and adequate slosh shields.
3. Vertical switch stems should be vertical for best results, but satisfactory operation is possible in most
liquids with the stem at up to a 30° angle from vertical.
4. Side mount switch stems must be mounted with the arrow vertically either up or down depending on
switch operation.
5. Care should be taken that switches are always operated within electrical ratings.
6. Orientation for standard Vertical switches can be changed from normally open to normally closed dry or
vice versa by removing the float and reversing it on the stem, except with the LV20-2101, LV20-2201,
LV21-1101 and LV21-1201.
TECHNOLOGY
Float switches consist of a float, magnet, reed switch and body/stem with mounting threads. When the probe
is dry, the float rests on the bottom of the stem such that the magnet does not influence the reed switch. As
the probe becomes immersed in liquid, the float becomes buoyant and the magnet elevates causing the reed
switch to change state.
MN801839 Rev B1 3 |
Safety Precautions Step Three
Operation is stated in the tank dry position.
Vertical Mounted Switches:
o NC Operation:
SS Floats: Witness mark (round circle) down.
Plastic Floats: Magnets up.
o NO Operation:
SS Floats: Witness mark (round circle) up.
Plastic Floats: Magnets down.
*Note: LV20-2101, LV20-2201, LV21-1101 and LV21-1201 are not reversible. The LV20-
2101 and LV21-1101 are Normally Closed. The LV20-2201 and LV21-1201 are Normally
Open
Horizontal Mounted Switches:
o NC Operation:
Arrow mounted vertically pointed down.
o NO Operation:
Arrow mounted vertically pointed up.
| 4 MN801839 Rev B1
Environmental Step Four
DIMENSIONS
LV35-S201 LV35-S401 LV36-S201
LV36-S401 LV36-S501 LV20-1501
LH35-S201 LH25 -1201 & LH25-52 01 LH25-1401 & LH25-5401
LV20-2101 & LV20-2201 LV21-1101 & LV21-1201
MN801839 Rev B1 5 |
Environmental (continued) Step Four
DIMENSIONS (CONTINUED)
LH29-1001
AV16-S243, AV26-S243, AV36-S243,
AV46-S243 & AV56-S243
AV26-S243 Shown
MATERIAL COMPATIBILITY:
o The LV36-S201, LV36-S401, LV35-S201, LV35-S401, LH35-S201 and LV36-S501 are made of 316
stainless steel (316 SS) with 22 AWG, Teflon 24” wire.
o The LH25-1201, LH25-1401, LV21-1101, LV21-1201 and LV20-1501 are made of Polypropylene (PP) with
22 AWG, Teflon 24” wire.
o The LV20-2101 and LV20-2201 are made of Polytetrafluoroethylene (PTFE) with 22 AWG, Teflon 24” wire.
o The LH25-5201 and LH25-5401 are made of Polyvinylidene Fluoride (PVDF) with 22 AWG, Teflon 24” wire
o The LH29-1001 is made of Polypropylene (PP) with a Valox 420 stem and 22 AWG, HALAR jacketed 120”
wire.
o The AV16-S243, AV26-S243, AV36-S243, AV46-S243 and AV56-S243 are made of 316 Stainless Steel
(316 SS) with a Polypropylene (PP) enclosure.
o Make sure that the switch is compatible with the application liquids. To determine the chemical
compatibility between the sensor and its application liquids, refer to the Compass Corrosion Guide,
available from Compass Publications.
| 6 MN801839 Rev B1
Electrical Interface Step Five
TYPICAL CURRENT AND VOLTAGE RATINGS
Watts Voltage Current Amps
15 240 AC
120 AC
100 DC
24 DC
30 240 AC
120 AC
120 DC
24 DC
60 240 AC
120 AC
120 DC
24 DC
100 240 AC
120 AC
120 DC
24 DC
-
0.12
0.10
0.30
0.14
0.28
0.07
0.28
0.40
0.50
0.20
0.50
0.40
1.00
0.40
1.00
Note: The ratings above right are for resistive loads only. For inductive loads, maximum switch life will be
achieved if appropriate arc suppression is used.
The following part numbers; LV36-S201, LV36-S401, LV35-S201, LV35-S401, LV20-2101, LV20-2201,
LV21-1101, LV21-1201, LH35-S201, LH25-1201, LH25-1401 and LH29-1001, are all two wire reed switch
outputs where polarity does not matter.
Part numbers LV36-S501 and LV20-1501 are reed switch outputs with three additional wires (there are 2
red-wires and 1 white-wire from the RTD) that are used to output the 100-ohm RTD used to measure the
temperature of the environment.
MN801839 Rev B1 7 |
Electrical Interface (continued) Step Five
AV_6 SERIES FLOAT AND WIRE KEY
SPST
Switches
F-Dim
E-Dim
D-Dim
C-Dim
B-Dim
A-Dim
AV16-S243
(1) Switch
RED
RED WHITE
RED WHITE BLUE
BLACK BLACK BLACK BLACK
Total Stem Length
AV26-S243
(2) Switches
AV36-S243
(4) Switches
AV46-S243
(4) Switches
AV56-S243
(5) Switches
RED
WHITE
BLUE
GREEN
BLACK
Note: Each float will have a pair of colored wires for each level. For example, With a AV56-S243, the B-Dim
float will have two black wires as the switch contact.
| 8 MN801839 Rev B1
Electrical Interface (continued) Step Five
SPECIFICATIONS
Part
Number
Standard Full-Size Vertical
LV36-S201
LV36-S401
LV35-S201
LV35-S401
LV20-2101
LV20-2201
LV21-1101
LV21-1201
Standard Horizontal
LH35-S201
LH25-1201
LH25-1401
LH25-5201
LH25-5401
Vertical Floats with 100 Ohm RTD
LV36-S501 Vertical SS 316 SS 316 SS 200 200 0.55 60 ¼” NPT
LV20-1501 Vertical PP PP PP 105 100 0.85 30 1/8” NPT
Configured (Multi-Level) Vertical Assembly
AV16-S243
AV26-S243
AV36-S243
AV46-S243
AV56-S243
Interstitial Switch
LH29-1001 PP
NOTES:
Description
Vertical large
Vertical large w/
slosh shield
Vertical small
Vertical small w/
slosh shield
Teflon, NC
Teflon, NO
Sub-miniature, NC
Sub-miniature, NO
Horizontal side
mount
Horz. side mount
Horz. side mount w/
slosh shield
Horz. side mount
Horz. side mount w/
slosh shield
1-point float system
2-point float system
3-point float system
4-point float system
5-point float system
Float
Mat’l
316 SS
316 SS
316 SS
316 SS
PFTE
PFTE
PP
PP
316 SS 316 SS 200 300 0.60 30 ½” NPT
PP
PP
PVDF
PVDF
316 SS
316 SS
316 SS
316 SS
316 SS
Stem
Mat’l
316 SS
316 SS
316 SS
316 SS
PFTE
PTFE
PP
PP
PP
PP
PVDF
PVDF
316 SS
316 SS
316 SS
316 SS
316 SS
Valox
420
Max. Oper.
Temp (°C)
200
200
200
200
150
150
105
105
105
105
100
100
200
200
200
200
200
105 50 0.85 30W N/A
Max
Pressure
(PSIG)
500
500
300
300
25
25
50
50
100
100
100
100
200
200
200
200
200
Float
SG
0.70
0.70
0.70
0.70
0.69
0.69
0.60
0.60
0.60
0.60
0.75
0.75
0.55
0.55
0.55
0.55
0.55
Nominal
VA
100
100
30
30
60
60
15
15
30
30
30
30
60
60
60
60
60
Fitting
¼” NPT
¼” NPT
1/8” NPT
1/8” NPT
1/8" NPT
1/8" NPT
3/8-16
UNC
3/8-16
UNC
½” NPT
½” NPT
½” NPT
½” NPT
2” NPT
2” NPT
2” NPT
2” NPT
2” NPT
Also applies to models with slosh shields
The LV20-2101 and LV21-1101 are Normally Closed.
The LV20-2201 and LV21-1201 are Normally Open.
MN801839 Rev B1 9 |
Maintenance Step Six
Maintenance should consist of inspection to see that the float is free to move and not coated with any
substance, which would change its weight or volume significantly. If this occurs, the float should be cleaned.
This is easily accomplished without disturbing the installation. In addition, the stem may be wiped down to
remove any build-up. The only repair possible in the field is replacement of either the float or stem. Dents or
nicks on the float are usually of no consequence to operation.
CAUTIONS
Flowline manufactures a wide range of liquid level switches and technologies. While each of these switches
are designed to operate in a wide variety of applications, it is the user's responsibility to select a switch model
that is appropriate for the application, install it properly, perform tests of the installed system, and maintain all
components. The failure to do so could result in property damage or serious injury.
1. The pressure, temperature and electrical limitations shown for the specified level switches must not be
exceeded.
2. The pressures and temperatures must take into consideration possible surges in the temperature and
pressure of the system.
3. The liquids used must be compatible with the materials of construction. Specifications of materials will
be given upon request.
4. Life expectancy of the switch varies with applications. Contact the factory if life cycle testing is required.
5. Ambient temperature changes can affect switch set points, since specific gravities of liquids vary with
temperature. Consult factory for assistance.
6. Level switches have been designed to be shock and vibration resistant. For maximum life, both shock
and vibration should be minimized. Consult factory for assistance.
7. Excessive contaminants in fluid may inhibit float operation, and occasional wipe down may be
necessary.
8. Level switches must not be field repaired
9. Physical damage to product may render product unserviceable.
10. Installation in a vessel made from magnetic materials may affect operation.
TESTING THE INSTALLATION:
1. Power: Turn on power to the controller and/or power supply.
2. Immersing the switch: Immerse the sensing tip in its application liquid, by filling the tank up to the
switches point of actuation. An alternate method of immersing the switch during preliminary testing is to
hold a cup filled with application liquid up to the switch's tip.
3. Test: With the switch being fluctuated between wet and dry states, the switch indicator light in the
controller should turn on and off. If the controller doesn't have an input indicator, use a voltmeter or
ammeter to ensure that the switch produces the correct signal.
4. Point of actuation: Observe the point at which the rising or falling fluid level causes the switch to
change state, and adjust the installation of the switch if necessary.
| 10 MN801839 Rev B1
Maintenance Step Six
CLEANING PROCEDURE:
1. Power: Make sure that all power to the switch, controller and/or power supply is completely
disconnected.
2. Switch removal: If necessary, make sure that the tank is drained well below the switch prior to removal.
Carefully, remove the sensor from the installation.
3. Cleaning the switch: Using a soft bristle brush and mild deter-gent, carefully wash the switch. Do not
use harsh abrasives such as steel wool or sandpaper, which might damage the surface of the sensor.
Do not use incompatible solvents, which may damage the sensor's PP or PVDF plastic body. Take
particular care to remove any scaling from the float body and make sure that it moves freely.
4. Sensor installation: Follow the appropriate steps of installation as outlined in the Installation section of
this manual.
MN801839 Rev B1 11 |
Warranty, Returns and Limitations Step Ten
WARRANTY
Flowline warrants to the original purchaser of its products that such products will be free from defects in
material and workmanship under normal use and service in accordance with instructions furnished by Flowline
for a period of two years from the date of manufacture of such products. Flowline's obligation under this
warranty is solely and exclusively limited to the repair or replacement, at Flowline's option, of the products or
components, which Flowline's examination determines to its satisfaction to be defective in material or
workmanship within the warranty period. Flowline must be notified pursuant to the instructions below of any
claim under this warranty within thirty (30) days of any claimed lack of conformity of the product. Any product
repaired under this warranty will be warranted only for the remainder of the original warranty period. Any
product provided as a replacement under this warranty will be warranted for the full two years from the date of
manufacture.
RETURNS
Products cannot be returned to Flowline without Flowline's prior authorization. To return a product that is
thought to be defective, go to flowline.com, and submit a customer return (MRA) request form and follow the
instructions therein. All warranty and non-warranty product returns to Flowline must be shipped prepaid and
insured. Flowline will not be responsible for any products lost or damaged in shipment.
LIMITATIONS
This warranty does not apply to products which: 1) are beyond the warranty period or are products for which
the original purchaser does not follow the warranty procedures outlined above; 2) have been subjected to
electrical, mechanical or chemical damage due to improper, accidental or negligent use; 3) have been modified
or altered; 4) anyone other than service personnel authorized by Flowline have attempted to repair; 5) have
been involved in accidents or natural disasters; or 6) are damaged during return shipment to Flowline. Flowline
reserves the right to unilaterally waive this warranty and dispose of any product returned to Flowline where: 1)
there is evidence of a potentially hazardous material present with the product; or 2) the product has remained
unclaimed at Flowline for more than 30 days after Flowline has dutifully requested disposition. This warranty
contains the sole express warranty made by Flowline in connection with its products. ALL IMPLIED
WARRANTIES, INCLUDING WITHOUT LIMITATION, THE WARRANTIES OF MERCHANTABILITY AND
FITNESS FOR A PARTICULAR PURPOSE, ARE EXPRESSLY DISCLAIMED. The remedies of repair or
replacement as stated above are the exclusive remedies for the breach of this warranty. IN NO EVENT SHALL
FLOWLINE BE LIABLE FOR ANY INCIDENTAL OR CONSEQUENTIAL DAMAGES OF ANY KIND
INCLUDING PERSONAL OR REAL PROPERTY OR FOR INJURY TO ANY PERSON. THIS WARRANTY
CONSTITUTES THE FINAL, COMPLETE AND EXCLUSIVE STATEMENT OF WARRANTY TERMS AND NO
PERSON IS AUTHORIZED TO MAKE ANY OTHER WARRANTIES OR REPRESENTATIONS ON BEHALF
OF FLOWLINE. This warranty will be interpreted pursuant to the laws of the State of California. If any portion
of this warranty is held to be invalid or unenforceable for any reason, such finding will not invalidate any other
provision of this warranty.
For complete product documentation, video training, and technical support, go to flowline.com.
For phone support, call 562-598-3015 from 8am to 5pm PST, Mon - Fri.
(Please make sure you have the Part and Serial number available.)
| 12 MN801839 Rev B1
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