APG Sensors FLR Series Stem Mounted Multi Point Float Switch User Manual

Materials of Construction: Stem – 316L Stainless Steel, Floats – 316L Stainless Steel, Stops, Misc Hardware – 316L Stainless Steel
Mechanical Conduit Connection: 3/4 NPTM

Product Usage Instructions

Chapter 1: Specifications and Options

Dimensions:
3/4 NPT Hex Plug Mounting per order

Specifications

Maximum Stem Length (L): 153 inches (3886.2 mm)

Minimum Switch Separation: 3 inches (76 mm)
Float Specific Gravity: 0.59, 0.607, or 0.92

Chapter 2: Installation and Removal Procedures and Notes

Tools Needed:
List of tools needed for installation

Installation Notes:
Important notes for installing the product
Mounting Instructions:
Step-by-step guide on how to mount the product

Electrical Installation:
Instructions for electrical connections
Removal Instructions:
Step-by-step guide on how to remove the product

Chapter 3: Maintenance

General Care:
Instructions on how to care for and maintain the product

INTRODUCTION

Thank you for purchasing an FLR Multi-Point Stem Mounted Float Switch from APG. We appreciate your business! Please take a few minutes to familiarize yourself with your FLR and this manual. The FLR contains up to seven reed switches in a 1/2” Ø stainless steel stem and permanent magnets in the floats. As each float rises or falls with the level of the liquid, the magnet inside the float acts on the corresponding reed switch inside the stem to provide SPST switching action.

Reading your label
Every APG instrument comes with a label that includes the instrument’s model number, part number, serial number, and a wiring pinout table. Please ensure that the part number and pinout table on your label match your order.

WARRANTY AND WARRANTY RESTRICTIONS

This product is covered by APG’s warranty to be free from defects in material and workmanship under normal use and service of the product for 24 months. For a full explanation of our Warranty, please visit https://www.apgsensors.com/resources/warranty-certifications/warranty-returns/. Contact Technical Support to receive a Return Material Authorization before shipping your product back.

Repair and Returns

Should your FLR require service, please contact the factory via phone, email, or online chat. We will issue you a Return Material Authorization (RMA) number with instructions.

Please have your FLR’s part number and serial number available. See Warranty & Warranty Restrictions for more information.

CHAPTER 1: SPECIFICATIONS AND OPTIONS

Dimensions

Maximum Stem Length (L):
- 153 inches (3886.2 mm)
- Distance, in inches, to the first switch
- Distance, in inches, to the second switch
Wetted Material:
- 316L Stainless Steel

Notes:

Allow at least 2 inches from the fixed mount connection to the first switch location (l or up to 6 inches for slide connections.
Allow 3 inches between switch locations(l 2-l 1, etc)
Allow 2 inches from the last switch location to the bottom of the probe (L-l final).

FLR Floats

IMPORTANT:
The switch points on an FLR with no housing CANNOT be moved, changed, or adjusted.

Specifications

Performance

Switch Points Up to seven
Maximum Stem Length 153 inches / 12.75 feet / 3890 mm
Minimum Switch Separation 3 inches / 0.25 feet / 76 mm

Float Specific Gravity 0.59, 0.607, or 0.92
Switch Points Up to seven
Maximum Stem Length 153 inches / 12.75 feet / 3890 mm

Minimum Switch Separation 3 inches / 0.25 feet / 76 mm
Float Specific Gravity 0.59, 0.607, or 0.92

Accuracy

Resolution ± 1/16 inch / 1.6 mm at each switch
Hysteresis 0.06 inches / 1.5 mm

Environmental

Operating Temperature -40 to 100°C / -40 to 212°F
Hazardous Ratings None

Electrical

Switch Rating
Maximum Capacity Switch B: 50 VA
Switch C: 180 VA

Maximum Current (AC, 50/60 Hz) 0.5 A
Maximum Current (DC) 0.5 A
Maximum Voltage 120 VDC / 220 VAC

Lead Wires #22 AWG, Teflon, 1 – 15 feet / 305 – 4570 mm

Materials of Construction

Stem 316L Stainless Steel

Floats 316L Stainless Steel
Floats Stops, Misc Hardware 316L Stainless Steel

Mechanical

Conduit Connection 3/4” NPTM

Model Number Configurator

Model Number: FLR – _____ _____ – _____ – _____ – _____ – _____ – _____ A B C D E F G

A. Mounting Type

0A Flat Face ANSI Flange 150#
3SF Triclamp
4T NPT Plug 150#, mounted outside tank

B. Mounting Size

1.5*† (NPT Plug only)
2* (Flange, Triclamp, or NPT Plug)

2.5* (Flange or NPT Plug)
3* (Flange or NPT Plug)

Note: Add an ‘S’ after Mounting Size for Slide Connection.

Note: 1.5 NPT Plug requires floats C or D.

C. Housing

W__ No housing. 3/4” NPT Plug above selected mount, lead wires 1 -15 feet, in 1-foot increments

D. Reed Switch

B 50 VA
C 180 VA

E. Number of Switch Points

1-7 Select the number of switch points required

F. Float Type

A 316L SS (2.06 in. diameter, 0.59 SG)
B 316L SS (2.06 in. diameter, 0.92 SG)
C 316L SS (1.63 in. diameter, 0.607 SG)

D 316L SS (1.63 in. diameter, 0.92 SG)

G. Probe Length (Inches)

Inches (up to 153 inches)

Switch Point Location(s)

(Measured from process connection)

____ inches (designate NO or NC position)

2 ____ inches (designate NO or NC position)
3 ____ inches (designate NO or NC position)
4 ____ inches (designate NO or NC position)

5 ____ inches (designate NO or NC position)
6 ____ inches (designate NO or NC position)
7 ____ inches (designate NO or NC position)

Note:
Allow at least 2 inches from the fixed process connection to the first switch location (up to 6 inches for slide connections), 3 inches between switch locations, and 2 inches from the last switch location to the bottom of the probe.

Wire Color Diagrams and Table

Below are wire color diagrams and a wire color table to assist you in wiring your FLR. L1 refers to the top-most level switch.

Wire Colors For Four or Fewer Switches

Wire Colors For Five or More Switches

Wire Color Table For Every Switch Configuration

No. of Levels	Wiring Color
No. of Levels	L1	L2	L3	L4	L5	L6	L7	Com.
L1	Blk x 2
L2	Blk x 2	Wh x 2
L3	Blk x 2	Wh x 2	Red x 2
L4	Blk x 2	Wh x 2	Red x 2	Grn x 2
L5	Black	White	Red	Green	Yellow			Grey
L6	Black	White	Red	Green	Yellow	Brown		Grey
L7	Black	White	Red	Green	Yellow	Brown	Blue	Grey

CHAPTER 2: INSTALLATION AND PROCEDURES AND NOTES

Tools Needed

Wrench-sized appropriately for your FLR’s mounting

Wrench-sized appropriately for conduit connections
Thread tape or sealant compound for threaded connections

Installation Notes

Do not locate the FLR series sensor near inlets/outlets.

If there is surface wave action, then use a time-delay relay or stilling tube. If a stilling tube is used, drill vent holes in the tube and use a spacer to ensure the float has free travel inside the tube (See Figure 2.1).
The FLR can be mounted up to 30° from vertical.

Mounting Instructions

Flange Mounting
Provide the compatible mating flange on the tank and install using a suitable gasket.
Plug Mounting
Provide the compatible female boss on the tank and install the FLR with a suitable gasket, O-ring, or thread tape.

Electrical Installation

Check the Wire Color Diagrams and Table on page 4 before making any connections.

Connect the wire(s) for each switch to your system.
Where necessary, make a junction box or conduit connection to 3/4” NPT threads above FLR mounting.
For inductive loads or high voltage/high current resistive loads, provide circuit protection for a switch(es) (See Figure 2.2). See Specifications on page 2 for switch ratings.

IMPORTANT:
DO NOT EXCEED CONTACT RATINGS! A back electromotive force of several hundred volts (energy stored in the inductance) arises when the contacts are opened. Under inductive loads or high/voltage/high current resistive loads. This results in a considerable decrease in contact life.

Removal Instructions

Removing your FLR from service must be done with care.

Ensure all switch circuits are de-energized.

Disconnect all switch circuits.
Remove the FLR with an appropriately sized wrench (per your mounting type).
Clean the FLR’s stem and floats of any debris (see General Care) and inspect for damage.

Store your FLR in a dry place, at a temperature between -40° and 100°C (-40° and 212°F).

CHAPTER 3: MAINTENANCE

General Care

Your FLR series stem-mounted multi-point float switch is very low maintenance and will need little care as long as it is installed correctly. However, in general, you should:

Periodically inspect the stem and floats for any trapped debris, sediment, or other foreign material.
Avoid applications for which the FLR was not designed, such as extreme temperatures, contact with incompatible corrosive chemicals, or other damaging environments.
If your FLR has an NPT mount, inspect the threads whenever you remove it from duty or change its location.