Dwyer L4 - Manual

Bulletin E-73
Specifications - Installation and Operating Instructions
Float Switch
W.E. ANDERSON DIV., DWYER INSTRUMENTS, INC.
P.O. BOX 358 • MICHIGAN CITY, INDIANA 46360 U.S.A.
Phone: 219/879-8000 www.dwyer-inst.com
Fax: 219/872-9057 e-mail: [email protected]
Series L4
Rugged and reliable the Flotect ® L4 Level 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 float 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.
FEATURES
• Leak proof body machined from bar stock
• Choice of floats dependent on maximum pressure and specific gravity
• Weatherproof, designed to meet NEMA 4
• Explosion-proof (listings included in specifications)
• Installs directly and easily into tank with a thredolet or flange
(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 and 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 float rated 100 psig (6.9 bar). For other floats 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 0344 II 2 G Ex d IIB T6 Gb -20°C≤Tamb≤73°C.
-20°C≤Process Temp≤73°C.
EC-Type Certificate No.: KEMA 03 ATEX 2383.
ATEX Standards: EN60079-0: 2009; EN60079-1: 2007.
IECEx Certified: For Ex d IIB T6 Gb -20°C≤Tamb≤73°C. -20°C≤Process
Temp≤73°C.
IECEx Certificate of Conformity: IECEx DEK 11.0071.
IECEx Standards: IEC 60079-0: 2007; IEC 60079-1: 2007.
Switch Type: SPDT snap switch standard, DPDT snap switch optional.
Electrical Rating: UL, FM, ATEX and 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 and IECEx unit: terminal block.
Process Connection: 1-1/2˝ male NPT standard, 2-1/2˝ male NPT
standard optional floats.
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 float.
Specific Gravity: 0.7 minimum with standard float. For other floats see
model chart.