Dwyer F7-EB User Manual

Externally-Mounted Bottle-Style Level Switches

Model F7-EB

To Install . . .

Locate and prepare entrances in tank side so that level switch unit will be in vertical position with wire leads up when
installed on outside of tank. Connect NPT inlet and outlet ports of unit to tank entrances. 1/2" NPT in top of unit
provides for electrical connection. (See wiring information below and on back of sheet.) Use 1/4"-20 threaded
mounting holes to attach unit on any suitable vertical surface.

- Specifications -

Operating Temperature
Pressure Rating
Electrical Termination

Approvals

Switch Operation
Mounting Attitude
Switch

Mounting

Plug

Groove

Stem

Union

Housing

Union

Pipe Fitting

Float

Grip
Ring

Lockwasher

or

O-Ring

-40°F to 300°F (-40°C to 148.9°C)
500 psig Max @ 70°F
No. 18 AWG, 24" L, Polymeric Lead Wires
U.L. Recognized File No. E45168
CSA Report LR 30200
Selectable, N.O. or N.C. by Inverting Float On Stem
Vertical with Lead Wires Up
20 VA (Pilot Duty)

Standard single level units are
supplied with SPST switch opera­tion, N.O. (Dry).

To convert operation to N.C. (Dry):
Remove level switch unit from
housing, remove lower grip ring
and invert float on unit stem.
Reinstall lower grip ring into
groove and reinstall level switch
unit** in housing.

**Clean or replace O-ring on

1/4-20
Screw

mounting plug (if required) before
reinstalling float/stem assembly
in housing. Mounting plug must
be installed flush with housing.

Note

Switch operation can be selected
without disturbing installation of
unit on tank.

Typical Wiring Diagram

SPST, N.O. or N.C.

2-5/8"

1/2" NPT
(Female)

Approx.

7"

1/4-20 Thd.

2" Dia.

Float

2-1/2" *

3/4" NPT

Inlet

Dia. Ref.

2 1/4 - 12 Thd.

W/ O-ring

4-1/4"

Ref.

2-1/8"

Dia.

*Switch actuation level nominal

(Based on a liquid specific gravity of 1.0)

3/4" NPT

Outlet

Maintenance (All Units) . . . An occasional "wipe-down" cleaning is the only maintenance normally required.

MAINTENANCE/REPAIR

Regular maintenance of the total system is recommended to assure sustained optimum performance. These devices
are not field repairable and should be returned to the factory if recalibration or other service is required. After first
obtaining a Returned Goods Authorization (RGA) number , send the unit freight prepaid to the following. Please include
a clear description of the problem plus any application information available.

Dwyer Instruments, Inc.
Attn: Repair Department
102 Highway 212
Michigan City , IN 46360

Important Points!

Product must be maintained and installed in strict accordance
with the National Electrical Code and Dwyer product catalog
and instruction bulletin. Failure to observe this warning could
result in serious injuries or damages.

For hazardous area applications involving such things as (but
not limited to) ignitable mixtures, combustible dust and
flammable materials, use an appropriate explosion-proof
enclosure or intrinsically safe interface device.

The pressure and temperature limitations shown on the
individual catalog pages and drawings for the specified level
switches must not be exceeded. These pressures and
temperatures take into consideration possible system surge
pressures/temperatures and their frequencies.

Selection of materials for compatibility with the media is critical
to the life and operation of Dwyer products. Take care in the
proper selection of materials of construction, particularly wetted
materials.

Life expectancy of switch contacts varies with applications.
Contact Dwyer if life cycle testing is required.

Ambient temperature changes do affect switch set points,
since the specific gravity of a liquid can vary with temperature.

Dwyer Products have been designed to resist shock and
vibration; however, shock and vibration should be minimized.

Filter liquid media containing particulate and/or debris to
ensure the proper operation of our products.

Electrical entries and mounting points in an enclosed tank
may require liquid/vapor sealing.

Dwyer Products must not be field-repaired.
Physical damage sustained by the product may render it

unserviceable.

DWYER INSTRUMENTS,INC.

P.O.BOX 373 MICHIGAN CITY, INDIANA 46361, U.S.A.

Phone: [phone] www.dwyer-inst.com
Fax: [phone] e-mail: [e-mail]
Lit-By Fax: [phone]