Dwyer L4 User Manual
IOM Guideline L4 ATEX
Bulletin E-73
Series L4
Specifications - Installation and Operating Instructions
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, hydropneumatic tanks, low pressure boilers, and various waste
water/sewage treatment processes
Float Switch
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
SAA]. ATEX and IECEx options, ambient temperature -4 to 163°F (-20 to
73°C); Process temperature -4 to 163°F (-20 to 73°F).
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. Alternate Temperature Class T5 Process
Temp ≤88°C, T4 Process Temp ≤123°C, 145°(T3) Process Temp ≤133°C
consult factory.
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. Alternate Temperature Class T5 Process
Temp ≤88°C, T4 Process Temp ≤123°C, 145°(T3) Process Temp ≤133°C
consult factory.
IECEX Certificate of Conformity: IECEX DEK 11.0071
IECEX Standards: IEC 60079-0: 2007; IEC60079-1: 2007
SAA: Exd II C T6 (T amb = 60°C).
Alternate Ratings: T5 (T amb = 75°C) T4 (T amb = 110°C) alternate “T”
ratings may be provided.
IP66 C1 I, Zone I. Also FM approved.
Switch Type: SPDT snap switch standard, DPDT snap switch optional.
Electrical Rating: UL, FM, ATEX and SAA 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 SAA].
Electrical Connections: UL and CSA models: 16 AWG, 6˝ (152 mm)
long. ATEX and SAA 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.
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: info@dwyer-inst.com
Example
FLOAT
316 STNLES. STL.
(STANDARD)
FLOAT ARM & BLOCK
316 STNLS. STL.
OR BRASS
SWITCH BODY
BRASS OR
316 STNLS. STL.
Ø1-5/8
[41.28]
5
[127.00]
6
[152.40]
19-7/32
[488.16]
8-7/32
[208.76]
MAGNET
KEEPER
430 STNLS. STL.
3
[76.20]
5
[127.00]
1-1/2 MALE NPT
MOUNTING
CONNECTION
16 GA. LEADS
6 [152.40] LONG
Ø2-1/2
[63.50]
3-11/32
[84.93]
3/4 FEMALE
NPT CONDUIT
CONNECTION
1-1/2 NPT
6
[152.40]
5
[127.00]
19-7/32
[488.16]
8-7/32
[208.76]
3
[76.20]
5
[127.00]
3/4 NPT
2-1/2
[63.50]
3-11/32
[84.93]
Construction
L4
L4
SS
D
L4-TOP
Wetted Material
Options
SS
316
NI
Switch Options
Float Options
D
50
150
300
Other Options
Flange*
Flange Size
Flange Material
Flange Rating
Bushing*
Bushing Size
Bushing Type
Bushing
Material
* Options that do not have ATEX or IECEx.
C
AT
IEC
SAA
EPOXY
MT
MV
NB
NH
TBC
TRD
TRI
C
1
L4-SS-D-C-F2C1
F
2
Side Mount, Brass Body, SPDT Switch
Top Mount, Brass Body, SPDT Switch (Specify rod length)
316 SS Body with 430 SS Magnet Keeper
316 SS Body and Magnet Keeper (Order with SS option)
Nickel 20 Magnet Keeper
DPDT Switch
2-1/2˝ Spherical, 304 SS rated 50 psi (3.5 bar), > 0.5 s.g.
2-1/2˝ Spherical, 316 SS rated 150 psi (10.3 bar), > 0.7 s.g.
2-1/2˝ Spherical, 304 SS rated 300 psi (20.7 bar), > 0.7 s.g.
ATEX
IECEx
SAA Construction
Epoxy Coated Housing
High Temperature* (See specifications for rating)
Gold Contact Snap Switch* (See specifications for rating)
Neoprene Boot*
No Electrical Housing*
Terminal Block Wire Connections*
Time Delay Relay* (On flow decrease)
Time Delay Relay* (On flow increase)
F
2
3
4
B
1
2
4
Flange Process Connection
2˝
3˝
4˝
Carbon Steel
C
316 SS
S
150 #
1
300 #
3
600 #
6
900 #
9
Bushing Process Connection
2˝
2-1/2˝
4˝
Hex
H
Flush
F
Brass
B
Carbon Steel
C
316 SS
S
304 SS
4
UL/CSA unit
ATEX/SAA unit
PARTS LIST
1. Cover lock. (ATEX/SAA unit only).
2. External ground. (ATEX unit only).
3. Enclosure housing and cover.
4. Terminal block. (ATEX and SAA unit
only, UL/CSA unit has 6˝ leads).
5. Internal ground.
*6. Magnet arm and switch assembly.
7. Switch body.
*8. Float, arm and block assembly.
*Approved replacement parts
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