APG LFP-V-2A, LFP-V-2B, LFP-V-2F, LFP-V-2P LVP-V Manual

AUTOMATION

Operator’s Manual

PRODUCTS

GROUP, INC.

LF Series

Model LFP-V

Miniature Level Switch

Doc #9004722 / Part #200437

Rev. A2, 11/19

Automation Products Group, Inc.

Tel: [phone] • Fax: [phone] • www.apgsensors.com • E-mail: [e-mail]

Model LFP-V Rev. A2, 11/19

Table of Contents

Warranty ..................................................................................3

Introduction ............................................................................. 4

Specications ...........................................................................4

Installation ...............................................................................5

Wiring .......................................................................................7

Automation Products Group, Inc.

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Rev. A2, 11/19 Model LFP-V

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

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

Automation Products Group, Inc.

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Model LFP-V Rev. A2, 11/19

• Introduction

The miniature magnetic level sensors are used for liquid level
detection. They have been designed for reliable operation in small
tanks and containers. Their rugged design and careful engineering
make them the optimum solution for OEM and large volume
applications.

• Specications

Operational Versions

LFP-V-2A ..................................polycetal stem and buna oat

LFP-V-2B ...................................brass stem and buna oat

LFP-V-2F ...................................PVDF stem and PVDF oat

LFP-V-2P ...................................polypropylene stem and

polypropylene oat

Characteristics

Switch Rating (resistive load) (50 VA):

Max contact rating ..................50 VA AC; 50 W DC

Max current .............................0.5 A AC; 0.5 A DC

Max voltage .............................300 V AC; 300 V DC

Life expectancy .......................107 operations (at 12 VDC, 5 mA)

Max temperature range ........-14 to 194°F (-10 to 90°C)

for LFP-V-2A, LFP-V-2B, and LFP-V-2P

-4 to 175°F (-20 to 80°C)

for LFP-V-2F-300

-14 to 104°F (-10 to 40°C)

for LFP-V-2F-1000

Max pressure ..........................145 psi (10 bar) for LFP-V-2A,

LFP-V-2B, LFP-V-2F-1000, and LFP-V-2P

28.4 psi (1.96 bar) for LFP-V-2F-300

Min SG ......................................0.6 for LFP-V-2A, LFP-V-2B

0.85 for LFP-V-2F-300 and LFP-V-2P

0.9 for LFP-V-2F-1000

Automation Products Group, Inc.

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Rev. A2, 11/19 Model LFP-V

Generic LFP (Nohken)

• Installation

Environment

The LFP should be installed in an area that meets the following
conditions:

• Within the specied temperature range.

• Located away from any strong magnetic eld.

• Located away from drop, splash or vapor around the lead wire
egress.
Note: Apply the proper sealing compound over the lead wire
egress if necessary. Liquid penetration may ruin insulation.

• Clean liquid, free from any foreign matter.

• Ample space for maintenance/
inspection.

Location

DO NOT locate near liquid inlets/

outlets.

NC NO

If there is surface wave motion, use a

time delay relay to dampen the switch

action.

A B

H

OFF

ON

ON

OFF

Ø

Point of operation in SG = 1.0 (water)
2A 2B 2P 2F-1000
NC-A:

Falling switch closes at

NC-B:

Rising switch opens at
NO-A:
NO-B:

Falling switch opens at
Rising switch closes at

24.5 21.5 20.0 19.0

23.0 20.0 18.5 17.5

22.5 19.5 17.0 16.5

21.0 18.0 15.5 15.0

Size of oat ø25xH25 ø25xH25 ø25xH25 ø25xH25

Note: Standard switch operation is NC (switch closes as the level
falls). Switch action can be reversed by inverting the oat. The
direction of close is marked on the oat.

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Model LFP-V Rev. A2, 11/19

Installation

Install the LFP vertically with the lead wires up and down.

4

3

2

1

1. Flange: Open holes (as necessary) through top of tank. Insert

oat and tighten the nut. Be sure to use a suitable gasket,
O-ring, or thread tape. Use a 1/4” pipe for extension, if
necessary.

2. Threaded: Use R1/8” or G1/8” female thread in top of tank. Use
suitable O-ring or thread tape.

3. Bulkhead: Drill a 10 mm (0.4”) hole in tank top. Insert and
tighten the nut. Use a suitable O-ring or thread tape.

4. Terminal Box: Provide G2” female mounting boss. Use suitable
O-ring or thread tape.

Note: After assembling the extension pipe, check insulation (100
MW or more) and switch operation. Improper assembly or seal may
result in damage or injury.

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Rev. A2, 11/19 Model LFP-V

• Wiring

Wiring should be in accordance with all local codes. Lead wires
are 22 AWG, UL listed. We recommend the use of solderless lugs for

connection.

Black

Switch Rating (Resistive)

• Max capacity 50 VA, 50 W

• Max current 0.5 A AC, 0.5 A DC

Black

• Max voltage 300 VAC, 300 VDC

Note: Max pull-load of the lead wire is 20 N. Excessive pulling or
kinking of the lead wire may break the switch.

Caution!

Protection for electrical surges:

• Overvoltage

Reed switches are not designed for the direct starting of inductive
loads such as motors, contactors, solenoid valves, and so on.
They are susceptible to damage from overvoltages. DO NOT
EXCEED THE CONTACT RATINGS. Contact should be wired to
miniature relays, suppressors or similar devices.

• Overcurrent

Momentary surge current may be produced by switching lamps
or stray capacity from long cable length, consequently welding
the reed switch. Contact should be wired to a relay unit, coils in
series, or suppressors.

Automation Products Group, Inc.

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AUTOMATION

PRODUCTS

GROUP, INC.

Automation Products Group, Inc.

Tel: [phone]
1/435/753-7300
Fax: [phone]

e-mail: [e-mail]

www.apgsensors.com

Automation Products Group, Inc.

1025 W. 1700 N.

Logan, UT 84321