Dwyer Series L10 is a versatile level switch with a wide range of applications in industrial and commercial settings. It is designed to monitor the level of liquids in tanks, vessels, and other containers. The switch can be used in a variety of liquids, including water, oil, chemicals, and food products.
The Series L10 is constructed with durable materials, including brass or stainless steel, and is rated for use in temperatures up to 200°F (93°C) and pressures up to 1000 psig (68.9 bar). It is also weatherproof and meets NEMA 4X (IP66) standards.
Dwyer Series L10 is a versatile level switch with a wide range of applications in industrial and commercial settings. It is designed to monitor the level of liquids in tanks, vessels, and other containers. The switch can be used in a variety of liquids, including water, oil, chemicals, and food products.
The Series L10 is constructed with durable materials, including brass or stainless steel, and is rated for use in temperatures up to 200°F (93°C) and pressures up to 1000 psig (68.9 bar). It is also weatherproof and meets NEMA 4X (IP66) standards.
INSTALLATION
1. Unpack switch and remove any packing material found inside lower housing or
float chamber (tee).
2. WARNING
Mechanical shock and vibration can cause damage to the reed
switch. Care should be taken to avoid dropping the switch on hard surfaces or
impacting the switch assembly.
3. Switch must be installed with body in a horizontal plane with arrow on side of
body pointing down.
4. If switch has an external float chamber (tee), connect it to vertical sections of 1˝
NPT pipe installed outside vessel walls at appropriate levels. If unit has no external
float chamber, it must be mounted in a 1˝ NPT half coupling welded to the vessel
wall. The coupling must extend through the wall. Use Teflon
®
thread tape or pipe
joint compound to assure a good seal.
5. Connect the wiring in accordance with local electrical codes.
6. Inductive, capacitive and lamp loads can all create conditions harmful to the reed
switch.
Series L10 Flotect
™
Mini-Size Level Switch
Bulletin E-37
Specifications – Installation and Operating Instructions
W.E. ANDERSON DIV., DWYER INSTRUMENTS, INC.
P.O. BOX 358 • MICHIGAN CITY, INDIANA 46361 U. S.A.
Phone: 219/879-8000 www.dwyer-inst.com
Fax: 219/872-9057 e-mail: info@dwyer-inst.com
1
/4 [6.35]
T
RAVEL TO
N
ORMALLY
C
LOSED
P
OSITION
2-7/8
[73.07]
5-7/16 [138.13]
4 [101.6]
18 AWG
LEAD WIRE
1 NPT
3
[
76.20]
1
[
25.40]
1
9
[
482.6]
C
ABLE
1/4 [6.35] TRAVEL
TO NORMALLY
CLOSED POSITION
2
-7/8
[
73.07]
19
[482.6]
CABLE
1
NPT
4 [101.6]
18 AWG
LEAD WIRE
NORMALLY CLOSED NORMALLY OPEN
Ø1 [25.40] X
2 [50.80] LONG
2-7/8
[
73.03]
3-1/2
[88.90]
1
[25.40]
2
-3/8
[
60.33]
1
[25.40]
1-1/16
[26.99]
2-7/8
[73.07]
1
[
25.40]
1
/4 [6.35] TRAVEL
T
O NORMALLY
CLOSED POSITION
1-3/4
[44.45]
Ø
1
[
25.40]
1
NPT
4 [101.6]
18 AWG
LEAD WIRE
3
-1/4
[
82.55]
1
9
[
482.6]
C
ABLE
3
/4
[
19.05]
A) Inductive loads can be caused by electromagnetic relays, electromagnetic
solenoids and electromagnetic counters, all with inductive compenents as the
circuit load.
B) Capacitive
loads can be caused by capacitors connected in series with or
parallel to the reed switch. IN a closed circuit, the calbe length (150 ft or more) to
the switch can introduce a capacitance.
C) Lamp loads
can be caused by switching lamp filaments which have low cold
resistance.
In addition to these causes, exceeding any of the maximum electrical ratings can
lead to premature or immediate failure. This includes inrush and surge currents
greater than the maximum switching current. To accomodate these conditions,
see diagrams on the reverse for possible solutions.
7. After installation, set the switch action to NO
(normally open) or NC (normally
closed). Normally open contacts close and normally closed contacts open when
liquid level in the vessel lifts the float past the actuation point. To change, loosen,
but do not remove, the two screws on the switch cap. Slide the reed switch
assembly to expose the switch action needed. Tighten screws when adjustment
is complete.
Model
Number
L10-B-3-O
L10-B-3-A
L10-B-3-C
L10-B-3-B
L10-B-3-H
L10-S-3-O
L10-S-3-A
L10-S-3-C
L10-S-3-S
L10-S-3-L
Body
Material
Brass
Brass
Brass
Brass
Brass
St. Steel
St. Steel
St. Steel
St. Steel
St. Steel
Installation/
Mounting
Side Wall
Side Wall
Side Wall
Ext. Tee
Ext. Tee
Side Wall
Side Wall
Side Wall
Ext. Tee
Ext. Tee
Float
Material
Solid Polypropylene
Cylindrical St. Steel
Round St. Steel
Solid Polypropylene
Round St. Steel
Solid Polypropylene
Cylindrical St. Steel
Round St. Steel
Solid Polypropylene
Round St. Steel
Max. Press.
psig (bar)
1000 (68.9)
200 (13.8)
350 (24.1)
250 (17.2)
250 (17.2)
2000 (137.8)
200 (13.8)
350 (24.1)
2000 (137.8)
350 (24.1)
Min.
S.G.
0.9
0.5
0.7
0.9
0.7
0.9
0.5
0.7
0.9
0.7
SPECIFICATIONS
Service: Compatible liquids.
Wetted Materials:
Float: Solid polypropylene or 304 SS;
Body: Brass or 303 SS;
Magnet: Ceramic;
External float chamber (tee): None,
brass, or 304 SS; Other: Lever arm,
pin, spring, etc.: 301 SS, 302 SS,
316 SS.
Temperature Limit: 200°F (93°C).
Pressure Limit: See model chart.
Enclosure Rating: Weatherproof,
meets NEMA 4X (IP66).
Switch Type: SPST hermetically
sealed reed switch. Field adjustable
for normally open or normally closed.
Electrical Rating: 1.5 A @ 24 VDC
res., 0.001 A @ 200 VDC res., 0.5A @
125 VAC.
Electrical Connections: 18 AWG, 19˝
(483 mm) long, PVC jacket. Rated
221°F (105°C).
Process Connection: 1˝ male NPT
standard on models without external
float chamber. Change 3 in model
number to 4 for 1-1/4˝, to 5 for 1-1/2˝, or
6 for 2˝. 1˝ female NPT on models with
external float chamber.
Mounting Orientation: Horizontal with
index arrow pointing down.
Weight: Approximately 10 oz (0.283 kg)
without external float chamber, 2.32 lb
(1.05 kg) with external float chamber.
Specific Gravity: See model chart.
Agency Approvals: UL and CSA.
Switch Enclosure: Nylon.
©Copyright 2011 Dwyer Instruments, Inc.
Printed in U.S.A. 11/11
FR# 82-440851-00 Rev. 2
CIRCUIT INFORMATION FOR REED SWITCH PROTECTION
R
EAD INFORMATION BELOW BEFORE INSTALLING YOUR NEW REED SWITCH CONTROL!
E
xceeding the current capacity of this Reed Switch control may cause FAULTY OPERATION!
B
e aware of the inductive and capacitive or lamp loads you may be placing on
y
ou Reed Switch Control. The circuits below outline possible solutions to preventing overloads due to inrush or surge currents exceeding maximum or when the switch current
a
nd product of the lamps (low “cold” resistance) is outlined below. Failure to follow these measures to protect Reed Switch Contacts may cause the contacts to weld together
or result in premature wear.
Possible Circuit Solutions Indicated by Dashed Lines
W.E. ANDERSON DIV., DWYER INSTRUMENTS, INC.
P.O. BOX 358 • MICHIGAN CITY, INDIANA 46361 U. S.A.
Phone: 219/879-8000 www.dwyer-inst.com
Fax: 219/872-9057 e-mail: info@dwyer-inst.com
I
nductive Loads
Possible causes –
An electromagnetic relay, electromagnetic solenoid,
electromagnetic counter with inductive component as
c
ircuit load.
Capacitive Loads
Possible causes –
A
capacitor connected in series or parallel with Reed
Switch control. In a closed circuit, a cable length (usually
greater than 50m [162.5 ft.]) used to connect reed switch
may also introduce static capacitance.
Lamp Loads
Possible causes –
A tungsten filament lamp load.
D
IODE SUPPRESSION
D
IODE
INDUCTIVE
LOAD
P
IV DIODE > V
R
EED
S
WITCH
R
EED
S
WITCH
U
SED IN
A
C CIRCUITS
V
ARISTER
VARISTER PROTECTION
I
NDUCTIVE
L
OAD
R
C SUPPRESSION
R
C
INDUCTIVE PROTECTION FOR
CABLE LENGTH CAPACITANCE
LOAD
REED
SWITCH
Cable Length
over 50 meters
[162.5 ft.]
REED
SWITCH
RESISTOR PROTECTION
FOR CAPACITIVE LOAD
S
URGE LIMITER FOR
C
APACITANCE IN SERIES
REED
SWITCH
CURRENT LIMITING RESISTOR
IN SERIES
CURRENT LIMITING RESISTOR
IN PARALLEL
REED
SWITCH
REED
SWITCH
INDUCTIVE
L
OAD
REED
S
WITCH
S
WITCH
[uf]
1
0
C
R
10*I
(1+50/E)
S
WITCH
2
C
LOAD
S
WITCH
SWITCH
L
OAD
C
R
L =0.5~5 mH
P
+V
R
A
P
L
R
A
+V
R = 50~500 Ohms
R
B
P
L
L = 0.5~5 mH
P
+V
R
L
R
R
V-0.12 R
L
2
+V R
L
5R > R
L
R
MAINTENANCE/REPAIR
Upon final installation of the Series L10, no routine maintenance is required. The
Series L10 is not field serviceable and should be returned if repair is needed. Field
repair should not be attempted and may void warranty.
WARRANTY/RETURN
Refer to “Terms and Conditions of Sales” in our catalog and on our website.
Contact customer service to receive a Return Goods Authorization number before
shipping the product back for repair. Be sure to include a brief description of the
problem plus any additional application notes.
-
1
-
2
Dwyer Series L10 is a versatile level switch with a wide range of applications in industrial and commercial settings. It is designed to monitor the level of liquids in tanks, vessels, and other containers. The switch can be used in a variety of liquids, including water, oil, chemicals, and food products.
The Series L10 is constructed with durable materials, including brass or stainless steel, and is rated for use in temperatures up to 200°F (93°C) and pressures up to 1000 psig (68.9 bar). It is also weatherproof and meets NEMA 4X (IP66) standards.
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