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Single-Station Level Switches

Instruction Bulletin No. 202503

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

Installation

A standard NPT female boss in tank top, bot-

tom or side is all that is required. Units operate

in any attitude - from the vertical to a 30° incli-

nation - with lead wires up or down. Standard

IPS pipe extends units to any intermediate level

in the tank. (Figure 1)

Moisture Protection: When moisture exists in

conduit and extension pipes, the potential for

this moisture to "wick" down the wire leads and

into the switch assembly exists. Should this

happen, the switch will appear to be closed due

to a high resistance path through the moisture.

The following suggestions may help to prevent

this from happening:

1. Pitch conduit away from the level switch when

possible, so that condensation will drip away

from the level switch assembly.

(Figure 2)

- Figure 1 -

- Figure 2 -

30°

Max.

Conduit

DWYER INSTRUMENTS,INC.

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

Phone: 219/879-8000 www.dwyer-inst.com

Fax: 219/872-9057 e-mail: [email protected]

Lit-By Fax: 888/891-4963

* Plastics ** Alloys

F7-C**

F7-SS3**

F7-BB**

F7-T*

F7-ST**

F7-PS*

F7-PVC*

1/8" NPT

1/4" NPT

1/8" NPT

1/8” NPT

1/4" NPT

1/4” NPT

1/8" NPT

3/8" - 24 Str. Thd.

1/2"

5/8"

21/32"

5/8"

1/2"

5/8"

5/8”

1/2"

3/4"

1-1/32"

1-7/8"

2-1/8"

2-1/16"

1-1/4"

(Slosh Shield Version)

1-7/8" (P/N F7-LL)

1-7/8"

1-1/2”

1-1/2"

Series Mounting HEX Size

Float

Diameter

F7*

1/8" NPT 1/2”

F7-SS6**

Important Points!

Product must be maintained and installed in strict accordance with the Na-

tional Electrical Code and Dwyer product catalog and instruction bulletin. Failure

to observe this warning could result in serious injuries or damages.

An appropriate explosion-proof enclosure or intrinsically safe interface device

must be used for hazardous area applications involving such things as (but not

limited to) ignitable mixtures, combustible dust and flammable materials.

Pressure and temperature limitations shown on individual catalog pages and

drawings for the specified level switches must not be exceeded. These pres-

sures and temperatures take into consideration possible system surge pres-

sures/temperatures and their frequencies.

Selection of materials for compatibility with the media is critical to the life and

operation of Dwyer level switches. 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.

Level switches have been designed to resist shock and vibration; however,

shock and vibration should be minimized.

Liquid media containing particulate and/or debris should be filtered to ensure

proper operation of Dwyer products.

Electrical entries and mounting points may require liquid/vapor sealing if lo-

cated in an enclosed tank.

Level switches must not be field repaired.

Physical damaged sustained by the product may render it unserviceable.

1 2

Inhaltsverzeichnis

Seite 1 - DWYER INSTRUMENTS,INC

Single-Station Level SwitchesInstruction Bulletin No. 202503MAINTENANCE/REPAIRRegular maintenance of the total system is recommended to assure sustain

Seite 2 - is recommended

Consult your Dwyer representative for moresuggestions on how to lessen the effects of moisture.No More Leaks is a trademark of Permatex® Industrial C

Verwandte Modelle: F7-ST714 | F7-ST713 | F7-PVC | F7-PS | F7-BB |

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