Instruction Manual

Series L4 Flotect
®
Float Switch
Specications - Installation and Operating Instructions
Bulletin E-73
Rugged and reliable the Series L4 Flotect
®
Float Switch operates automatically to
indicate tank level. Perfect for starting or stopping pumps, opening or closing valves,
or actuate level alarm signals. A unique magnetically actuated switching design gives
superior performance. There are no bellows, springs, or seals to fail. Instead, the free-
swinging oat attracts a magnet within the solid metal switch body, actuating a snap
switch by means of a simple lever arm. Float arm hinge design limits the arm angle to
prevent vertical hangup.
BENEFITS/FEATURES
• Leak proof body machined from bar stock
• Choice of oats dependent on maximum pressure and specic gravity
• Weatherproof, designed to meet NEMA 4
• Explosion-proof (listings included in specications)
• Installs directly and easily into tank with a thredolet or ange (see application
drawings on page 4)
• Electrical assembly can be easily replaced without removing the unit from the
installation so that the process does not have to be shut down
• Horizontal installation or optional top mount vertical installation
APPLICATIONS
• Direct pump control for maintaining level
• Automatic tank dump operations
• Control levels or provide alarms in sumps, scrubber systems, hydro-pneumatic
tanks, low pressure boilers, and various waste water/sewage treatment processes
SPECIFICATIONS
Service: Liquids compatible with wetted materials.
Wetted Materials: Float and rod: 316 SS; Body: Brass or 316 SS standard; Magnet
keeper: 430 SS standard, 316 SS or nickel optional.
Temperature Limits: 4 to 275°F (-20 to 135°C) standard, MT high temperature
option 400°F (205°C) [MT option not UL, CSA, ATEX or IECEx]. ATEX, IECEx
options: Ambient temperature -4 to 163°F (-20 to 73°C); Process temperature -4 to
163°F (-20 to 73°C).
Pressure Limit: Brass body 1000 psig (69 bar), 316 SS body 2000 psig (138 bar).
Standard oat rated 100 psig (6.9 bar). For other oats see model chart on next
page.
Enclosure Rating: Weatherproof and Explosion-proof. Listed with UL and CSA for
Class I, Groups C and D; Class II, Groups E, F, and G.
ATEX
2813 II 2 G Ex db IIB T6 Gb -20°C≤Tamb≤73°C.
-20°C≤Process Temp≤73°C.
EU-Type Certicate No.: KEMA 03 ATEX 2383.
ATEX Standards: EN60079-0: 2012 + A11: 2013; EN60079-1: 2014.
IECEx Certied: For Ex db IIB T6 Gb -20°C≤Tamb≤73°C. -20°C≤Process
Temp≤73°C.
IECEx Certicate of Conformity: IECEx DEK 11.0071.
IECEx Standards: IEC 60079-0: 2011; IEC 60079-1: 2014.
Switch Type: SPDT snap switch standard, DPDT snap switch optional.
Electrical Rating: UL, FM, ATEX or IECEx models: 10A @ 125/250 VAC (V~). CSA
models: 5A @ 125/250 VAC (V~); 5A res., 3A ind. @ 30 VDC (V). MV option: 1A @
125 VAC (V~); 1A res., .5A ind. @ 30 VDC (V
). MT option: 5A @ 125/250 VAC
(V~). [MT and MV option not UL, CSA, FM, ATEX or IECEx].
Electrical Connections: UL and CSA models: 16 AWG, 6˝ (152 mm) long. ATEX or
IECEx unit: terminal block.
Conduit Connection: 3/4˝ female NPT standard or M25 x 1.5 with -BSPT option.
Process Connection: 1-1/2˝ male NPT standard, 2-1/2˝ male NPT standard
optional oats or 1-1/2˝ male BSPT.
Mounting Orientation: Horizontal installation standard, optional vertical top mount.
Weight: 4 lb 9 oz (2.07 kg).
Dead Band: 3/4˝ (19 mm) for standard oat.
Specic Gravity: 0.7 minimum with standard oat. For other oats see model
chart.
DWYER INSTRUMENTS, INC.
P.O. BOX 373 • MICHIGAN CITY, INDIANA 46360, U.S.A.
Phone: [phone]
Fax: [phone]
www.dwyer-inst.com
e-mail: [e-mail]