Dwyer F7-T1 - Manual

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
1/8" NPT
1/4" NPT
1/4" 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"
1/2"
5/8"
21/32"
5/8"
1/2"
1/2"
5/8"
5/8”
1/2"
3/4"
1"
1-1/32"
1-7/8"
2-1/8"
2-1/16"
1"
1-1/4"
(Slosh Shield Version)
1-7/8" (P/N F7-LL)
1-7/8"
1-1/2”
1"
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.