APG FS-400 Operating Manual

APG

Thank You

Thanks for purchasing a Series FS-400 or FS-410 Float Switch from us! We appreciate your business
and your trust. Please take a moment to familiarize yourself with the product and this manual
before installation. If you have any questions, at any time, don’t hesitate to call us at 888-525-7300.

Vertical Stainless Steel Float Switch

Installation Guide

 NOTE: Scan the appropriate QR code below to see the datasheet with full specs on your

tablet or smartphone. Or visit www.apgsensors.com/support to nd it on our website.

FS-400 Datsheet (Doc #9005500) FS-410 Datasheet (Doc #9005501)

Table of Contents

1.Description

2. How To Read Your Label

3. Warranty

Description

1

Series FS-400 Stainless Steel Vertical Float Switches and Series FS-410 Miniature Stainless Steel

Vertical Float Switches are durable oat switches with a wide range of uses. Both are compact,

feature all stainless steel wetted materials, and have user-reversible switch orientation. All FS-400 &
FS-410 switches are made in the USA.

4. Installation Instructions

5. Dimensions

6. Reversing Switch Operation
(NO/NC)

7. General Care

8. Repair Information

9. Removal Instructions

Series FS-400 & FS-410

R

Automation Products Group, Inc.
1025 W 1700 N Logan, UT 84321
www.apgsensors.com | phone: [phone] | email: [e-mail]

Warranty

3

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/about-us/terms-conditions. Contact Technical Support to
receive a Return Material Authorization before shipping your product back.

Doc #9005502 Rev B

Part #200216

FS-400 & FS-410 switches should be installed in an area--indoors or outdoors--which meets the
following conditions:

• Ambient temperature between -40°F and 368°F (-40°C to 187°C); up to 500°F (260°C) for HT

• Process pressure 200 psi (13.8 bar) or less (FS-400-S); 500 psi (34.5 bar) or less (FS-400-HT);

or 300 psi (20.7 bar) or less (FS-410)

• Relative humidity up to 100%

• Altitude up to 2000 meters (6560 feet)

• No chemicals corrosive to stainless steel (such as NH

How To Read Your Label

2

Each label comes with a full model number, a part number, and a serial number. The model
number for the Series FS-400 or FS-410 Float Switch will look something like this:

 SAMPLE: FS-400-HT-M1-M1-0.6-P0-48

The model number correlates with all the congurable options and tells you exactly what you have.
Compare the model number to the options on the datasheet to identify your exact conguration.

You can also call us with the model, part, or the serial number and we can help you.

, SO2, Cl2, etc.)

3

Scan the QR code below to read the full explanation of our Warranty on your tablet or smartphone.

Installation Instructions

4

Installing your vertical oat switch is easy if you follow a few simple steps:

• Hold the switch beneath where it will mount, and feed the wires up through the mount.

• Insert the threads into the mount and begin to turn by hand.

• Use an appropriately sized wrench on the hex nut to completely tighten the threads.

• Connect the switch wires to your control system.

• Equipment must be grounded through nal installation.

• Adequate overcurrent protection must be provided at the supply.

Dimensions

5

1/4" NPTM

5/8" Hex Nut

Reversing Switch Operation (NO/NC)

6

All Series FS-400 and FS-410 Float Switches ship from the factory oriented for NO operation. To

change the switch to NC:

1. Remove the e-clip at the bottom of the oat stem.

2. Remove the oat, and turn it over.

3. Replace the re-oriented oat

4. Replace the e-clip.

NO Accuation: 0.220" ± 0.015"

NC Accuation: 0.160" ± 0.015"

NO Accuation: 0.130" ± 0.015"

NC Accuation: 0.115" ± 0.015"

2.38"

[60.48mm]

0.50"

[12.70mm]

[52.32mm]

FS-400 Dimensions

1/8" NPTM

1/2" Hex Nut

1.39"

[35.34mm]

0.34"

[8.64mm]

2.06"Ø

2.75"

[69.85mm]

[58.93mm]

1.80"

[45.72mm]

1.17"Ø

[29.72mm]

3.44"

[87.49mm]

2.32"

General Care and Notes

7

Your oat switch is very low maintenance and will need little care, as long as it was installed

correctly. However, in general, you should:

• Keep the oat arm and support arm generally clean.

• Avoid applications for which the switch was not designed, such as contact with incompatible

corrosive chemicals, or other damaging environments.

• Inspect the threads whenever you remove the switch from duty or change its location.

See datasheets (FS-400, Doc #9005500; FS-410, Doc #9005501) for the following specications:

• Specic Gravity

• Actuation Angle and Hysteresis

• Electrical power rating, voltage ranges with frequencies and currents

• Full Hazardous Location ratings statements

Repair Information

8

If your oat switch needs repair, contact us via email, phone, or on-line chat on our website. We will

issue you an RMA number with instructions.

• Phone: [phone]

• Email: [e-mail]

• Online chat at www.apgsensors.com

Removal Instructions

9

Removing your oat switch from service must be done with care. It’s easy to damage your switch if

you are not careful to follow these guidelines:

FS-410 Dimensions

• Make sure the liquid is well below the level of the switch. Follow any and all procedures for

safely isolating any media contained inside the line or vessel.

• Disconnect wires to switch.

• Loosen the switch with an appropriately sized wrench.

• Twist switch until completely free of threads.

• Pull wires out through mounting.

• Store your switch in a dry place, at a temperature between -40° F and 180° F.