liquid level float switches
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7/28/2019 Liquid Level Float Switches
1/2AEROSPACE
Liquid Level Float SwitchesDESCRIPTION
The AMETEK Float Switch family is made up of model series F8300, 610XXX and
8TJ 143XXX. These devices open or close an electrical circuit at a predetermined
level of liquid. They have been developed primarily for use in aircraft fuel and
lubrication tanks but are equally suited for many industrial applications in remote
and non-accessible locations where liquid level control is important. Various
installation modifications of the unit can be used to determine when a tank isfilled to capacity, to indicate when a specific amount of liquid has been
expended, or to indicate when a predetermined level has been reached.
Switches are designed for use with liquids under MIL-F-5572, MIL-F-5616,
MIL-F5624, MIL-L-7808, and MIL-L-23699 throughout a temperature range
of -65O to 275O F, but may be used with most other liquids.
CONSTRUCTION
Typical AMETEK Float Switches consist of three major parts: the body assembly,
float assembly, and shell. The body assembly contains the mounting flange,
mounting fitting, and a hermetically sealed, magnetically-operated reed switch,
potted in a sealed tube extending through a hole in the float assembly. The float
assembly, fabricated from a variety of nonmetallic materials, contains permanentmagnets and is protected by an aluminum outer shell which prevents random
operation caused by sloshing liquid. Lead wires, of a length to suit specific
applications, complete the unit.
OPERATION
To meet varying customer requirements, AMETEK has over 200 modified forms
available, some of which are illustrated on the reverse side. The Float Switch in
Figure 1, is designed to close the circuit as ascending fuel reaches the actuating
level, whereas, the Figure 2 switch operates to open the circuit when the ascending
fuel reaches the defined level, and the Figure 3 switch opens the circuit as the
fuel level descends. All versions of the AMETEK Float Switch will operate at any
position up to 45 from the vertical.
CONFORMANCE
AMETEK switches are designed to conform to the applicable requirements
of Military Specifications MIL-E- 5272A and MIL-F-8615, including the
following tests:
- Calibration - High Temperature (Wet)
- External Leakage - Vibration
- Endurance - Moist Fungus
- High Temperature (Dry) - Humidity
- Low Temperature - Salt Spray
FEATURES
Wide Varietyavailable in
over 200 service
configurations
Flexible Designcanreadily transform basic
design components
Light Weighttypically
weighs only 0.10 pounds
without lead wires.
Small Sizesome versions
less than 0.75" diameter
No Mechanical
Linkagesthe unit
contains only one moving
part, the float assembly
Safetyswitches are
available with unique
hermetically sealed inner
housing for applications
where current loads pose
a safety concern in fuel
tank applications
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7/28/2019 Liquid Level Float Switches
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HEADQUARTERS50 Fordham Road Wilmington MA 01887 U.S.A.
AEROSPACEwww.ametekaerospace.com
Sales
Tel: 978-988-4771 Fax: 978-988-4944
www.ametekaerospace.com E-mail: aerosales@ametek.com
Distribution and Repair
Tel: 978-988-4100 Fax: 978-988-4720
www.ametekaerospace.com/service.asp
PRINTED IN THE U.S.A. 2003, BY AMETEK, INC. ALL RIGHTS RESERVED. 5M903A (020090)
Liquid Level Float Switches
SPECIFICATIONS
ELECTRICAL CHARACTERISTICS
Rating: 0.5 ampere inductive load at 28 volts DC
DIMENSIONSINCH(MM)
Contact type: Single pole, single throw
Life: 100,000 cycles minimum
.188 DIA. - 4 HOLES
(4.8 DIA.)
1.38
(35.0)
2.28
(57.9)
FLOAT
SHELL
PERMANENT MAGNET
REED SWITCH
FITTING
TUBE
DAMPER SPRING
BEARING
.093 DIA. - 4 HOLES
(2.4 DIA.)
1.05
(26.7)
1.31.25
(33.36.35)
2.28
(57.9)
ACTUATING
LEVEL
0.84.25
(21.36.35)
2.75
(69.9)
ACTUATING
LEVEL1.31 +.00
-.25
(33.3 +.00)
-6.35
FIGURE 3
DESCENDING FUELOPENS CIRCUIT
FIGURE 2
ASCENDING FUEL
OPENS CIRCUIT
FIGURE 1
ASCENDING FUELCLOSES CIRCUIT
ACTUATING
LEVEL
.62
(15.7)
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