Flowline AV16, AV26, AV36, AV46, AV56 Operating Manual

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

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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.

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