PG.05D.11.T.E
1
May 2001
E51 Modular Limit Switch Style
Inductive Proximity Sensors
Contents
Overview . . . . . . . . . . . . . . . . . . . . . . 1
Model Selection,
Assembled Sensors . . . . . . . . . . . . 2
Model Selection,
Sensor Heads . . . . . . . . . . . . . . . . . 4
Model Selection,
Sensor Bodies . . . . . . . . . . . . . . . . . 5
Model Selection,
Logic Modules. . . . . . . . . . . . . . . . . 5
Model Selection, Receptacles . . . . . 6
Wiring Diagrams . . . . . . . . . . . . . . . . 7
Model Selection, Accessories . . . . . 7
Specifications . . . . . . . . . . . . . . . . . . 9
Dimensions . . . . . . . . . . . . . . . . . . . . 9
The E51 Inductive Proximity Sensor
family combines high performance
with a familiar limit switch style
housing. Modular, plug-in compo-
nents provide application flexibility,
ease of maintenance, less downtime
and reduced inventory. Choose from
2-wire sensors with AC/DC opera-
tion, or 4-wire sensors in either AC
or DC styles. Connection options
include terminal, mini-connector or
various lengths of cable.
Choose from standard sensors that
detect all types of metallic targets,
or sensors designed to detect only
a specific type of metal (ferrous only
or non-ferrous only). The next page
provides more detail on these two
classes of sensors.
Approvals
■
UL Listed
■
CSA Certified
For the most current information
on this product, visit our web site at:
www.sensingsolutions.com
Viton® is a registered trademark of Dupont
Dow Elastomers.
Inductive Proximity Sensors
E51 Limit Switch Style, Modular
Product Features
■
Rugged construction is ideal for industrial environments
■
Viton
®
gaskets ensure a positive seal and high resistance to industry chemicals
■
Direct replacement for worn out limit switches
■
Sensor heads and bodies feature captive screws to eliminate loss
■
All sensor heads include a selector switch to program output function to either
N.O. or N.C.
■
Sensor bodies feature bifurcated engagement prongs for a reliable connection
when plugging into receptacle stabs.
■
Engagement key between sensor body and receptacle prevents improper
assembly
■
Sensors accommodate both U.S. and DIN mounting dimensions
■
Wiring terminals feature captive pressure plate saddles for #18 to #12 AWG wire.
A green screw identified ground terminal is also included
■
Logic modules are available to provide additional control functions
For Customer Service in the U.S. call
1-800-356-1243,
in Canada call
1-800-268-3578.
For Application Assistance in the U.S. and Canada
call
1-800-426-9184.
This Rugged Sensor Family Features Modular Components
for Versatile Sensing
(where shown)
2
PG.05D.11.T.E
May 2001
Inductive Proximity Sensors
E51 Limit Switch Style, Modular
Standard Sensors
Standard E51 sensors feature long
sensing ranges and a choice of top
or side sensing heads. Alternate
frequency units eliminate interfer-
ence when mounted close to stan-
dard frequency units. Order sensors
in component form, as assembled
plug-in units, or in a sealed version
where the sensor body is factory
assembled to an epoxy filled recep-
tacle with tamper-proof screws to
ensure a lasting seal.
Ferrous or Non-ferrous Sensors
The E51 includes special sensing
heads that detect only ferrous
metals such as steel or iron, while
ignoring non-ferrous metals like
aluminum. Non-ferrous sensors
perform just the opposite function.
A common application for this type
of sensor incorporates a non-
ferrous sensor to detect an alumi-
num part while ignoring the steel
fixture that is holding it. Ferrous
and non-ferrous sensors are
available in component form or
as assembled units with epoxy
filled receptacles for use in environ-
ments with cutting fluids or other
contaminants. Top and side sensing
heads are also available.
Model Selection — Assembled Sensors — Standard (with Terminal Wiring)
All sensor heads feature a programmable output selector switch for N.O. or N.C. operation. Operation is as follows:
Logic modules must be ordered separately, see
Page 5.
These sensor bodies are rated NEMA 4, 4X and 13.
Receptacles feature terminal wiring with a 1/2” NPT thread at the conduit entrance. Other connection options are available:
Sensor heads feature color coded target symbols: Yellow for standard frequency; Green for alternate frequency; Red for ferrous; Blue for non-ferrous.
Assembled
Sensor
Sensor Body and Receptacle 2-Wire Sensors 4-Wire Sensors
Operating
Voltage
20 – 264V
AC/DC
120V AC 10 – 30V DC
Output N.O. or N.C.
N.O. and N.C. Complementary N.O. and N.C. Complementary
Sensor Body
E51SAL E51SCL E51SCN
Accepts Logic
Modules
E51SPL
PNP
E51SNL
NPN
Receptacle
E51RA E51RC E51RCB E51RN E51RN
Sensor Heads
Sensing Range Shielding Frequency Catalog Number
Sensor Head
Only
Catalog Number
Assembled Sensors with Head, Sensor Body and Receptacle
Standard Sensing
Top Sensing 0.51 inches
(13 mm)
Shielded Standard
E51DT1 E51ALT1 E51CLT1 E51CNT1 E51PLT1 E51NLT1
Alternate
E51DT2 E51ALT2 E51CLT2 E51CNT2 E51PLT2 E51NLT2
0.94 inches
(24 mm)
Unshielded Standard
E51DT5 E51ALT5 E51CLT5 E51CNT5 E51PLT5 E51NLT5
Alternate
E51DT6 E51ALT6 E51CLT6 E51CNT6 E51PLT6 E51NLT6
Side Sensing 0.51 inches
(13 mm)
Shielded Standard
E51DS1 E51ALS1 E51CLS1 E51CNS1 E51PLS1 E51NLS1
Alternate
E51DS2 E51ALS2 E51CLS2 E51CNS2 E51PLS2 E51NLS2
0.94 inches
(24 mm)
Unshielded Standard
E51DS5 E51ALS5 E51CLS5 E51CNS5 E51PLS5 E51NLS5
Alternate
E51DS6 E51ALS6 E51CLS6 E51CNS6 E51PLS6 E51NLS6
For This
Output Type:
Set Selector Position:
“TARGET” “NO TARGET”
N.O. Target Present Target Absent
N.C. Target Absent Target Present
Connection Option Suffix Example
20 mm thread at the conduit entrance
20 E51ALT120
Mini-Connector termination with epoxy filled receptacle,
see
Page 6
for additional receptacle options
2-wire,
3-pin connector
P3 E51ALT1P3
4-wire,
5-pin connector
P5 E51CLT1P5
Pre-wired cable with epoxy filled receptacle 8 feet long
S E51ALT1S
12 feet long
S12 E51ALT1S12
20 feet long
S20 E51ALT1S20
PG.05D.11.T.E
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May 2001
Inductive Proximity Sensors
E51 Limit Switch Style, Modular
Model Selection — Assembled Sensors — Standard and Ferrous/Non-ferrous (with Epoxy Filled Receptacles and Pre-wired Cables)
All sensor heads feature a programmable output selector switch for N.O. or N.C. operation. Operation is as follows:
Switch bases feature 8 feet of SOOW-A cable. Other connection options are available:
Sensor heads feature color coded target symbols: Yellow for standard frequency; Green for alternate frequency; Red for ferrous; Blue for non-ferrous.
Assembled Sensor Sensor Base Type with
8 Foot Cable
2-Wire Sensors 4-Wire Sensors
Operating
Voltage
20 – 264V AC/DC 120V AC 10 – 30V DC
Output N.O. or N.C.
N.O. and N.C.
Complementary
N.O. and N.C. Complementary
PNP NPN
Sensor Heads
Sensing Range Shielding Frequency Catalog Number
Sensor Head Only
Catalog Number
Assembled Sensors with Head and Sensor Base
Standard Sensing (Sensor Body Is Attached to Receptacle with Tamper-Proof Screws)
Top Sensing 0.51 inches
(13 mm)
Shielded Standard
E51DT1 E51ALT16P E51CLT16P E51PLT16P E51NLT16P
Alternate
E51DT2 E51ALT26P E51CLT26P E51PLT26P E51NLT26P
0.94 inches
(24 mm)
Unshielded Standard
E51DT5 E51ALT56P E51CLT56P E51PLT56P E51NLT56P
Alternate
E51DT6 E51ALT66P E51CLT66P E51PLT66P E51NLT66P
Side Sensing 0.51 inches
(13 mm)
Shielded Standard
E51DS1 E51ALS16P E51CLS16P E51PLS16P E51NLS16P
Alternate
E51DS2 E51ALS26P E51CLS26P E51PLS26P E51NLS26P
0.94 inches
(24 mm)
Unshielded Standard
E51DS5 E51ALS56P E51CLS56P E51PLS56P E51NLS56P
Alternate
E51DS6 E51ALS66P E51CLS66P E51PLS66P E51NLS66P
Ferrous or Non-ferrous Metal Sensing
Top Sensing 0.31 inches
(8 mm)
Shielded Ferrous
metals only
E51DT8 E51ALT86P E51CLT86P E51PLT86P E51NLT86P
Non-ferrous
metals only
E51DT7 E51ALT76P E51CLT76P E51PLT76P E51NLT76P
Side Sensing 0.31 inches
(8 mm)
Shielded Ferrous
metals only
E51DS8 E51ALS86P E51CLS86P E51PLS86P E51NLS86P
Non-ferrous
metals only
E51DS7 E51ALS76P E51CLS76P E51PLS76P E51NLS76P
For This
Output Type:
Set Selector Position:
“TARGET” “NO TARGET”
N.O. Target Present Target Absent
N.C. Target Absent Target Present
Connection Option Suffix Example
Mini-Connector mounted on 3 foot (900 mm) pigtail cable
T E51ALT16PT
Mini-Connector mounted to switch base
C E51ALT16PC
Cable longer than 8 feet, add required length in 1 foot incre-
ments to listed Catalog Number — 20 foot maximum
(Length in feet) E51ALT16P12 for 12 feet
4
PG.05D.11.T.E
May 2001
Model Selection — Sensor Heads
All sensor heads feature a programmable output selector switch for N.O. or N.C. operation.
Operation is as follows:
Sensor heads feature color coded target symbols: Yellow for standard frequency;
Green for alternate frequency; Red for ferrous; Blue for non-ferrous.
Sensing Range Shielding Frequency Target Material Catalog Number
Standard Sensing
Top Sensing 0.51 inches
(13 mm)
Shielded Standard All metals
E51DT1
Alternate All metals
E51DT2
0.94 inches
(24 mm)
Unshielded Standard All metals
E51DT5
Alternate All metals
E51DT6
Side Sensing 0.51 inches
(13 mm)
Shielded Standard All metals
E51DS1
Alternate All metals
E51DS2
0.94 inches
(24 mm)
Unshielded Standard All metals
E51DS5
Alternate All metals
E51DS6
Ferrous or Non-ferrous Metal Sensing
Top Sensing 0.31 inches
(8 mm)
Shielded Standard Ferrous
metals only
E51DT8
Non-ferrous
metals only
E51DT7
Side Sensing 0.31 inches
(8 mm)
Shielded Standard Ferrous
metals only
E51DS8
Non-ferrous
metals only
E51DS7
For This
Output Type:
Set Selector Position:
“TARGET” “NO TARGET”
N.O. Target Present Target Absent
N.C. Target Absent Target Present
Inductive Proximity Sensors
E51 Limit Switch Style, Modular
PG.05D.11.T.E
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May 2001
Inductive Proximity Sensors
E51 Limit Switch Style, Modular
Model Selection — Sensor Bodies
This sensor body is available in a factory-sealed, non plug-in configuration (with 8-foot cable), add
6P
to listed Catalog Number.
Example: E51SAL
6P.
Sensor body is black. E51SCN sensor bodies are rated NEMA 4, 4X and 13.
This sensor accepts logic modules, as seen in chart below.
Model Selection — Logic Modules (for E51SCN Sensor Body Only)
Repeatability of the timing cycle is ±1% at constant voltage, ambient temperature and reset time.
Operating Voltage Output Protection Output Rating Continuous Type Catalog
Number
2-Wire Sensors
AC/DC 20 – 264V AC/DC,
50/60 Hz
1 output, load powered,
N.O. or N.C., program-
mable from head;
off state leakage current::
<1.7 mA at 120V AC/DC,
<2.0 mA at 240V AC
Latching
short circuit
and overload
0.5A —
E51SAL
4-Wire Sensors
AC 120V AC,
50/60 Hz
2 complementary
outputs, line powered,
N.O. and N.C.
— 1.0A to 158° (70°), linearly
derated to 0.6A at 176° (80°)
—
E51SCL
1.0A to 113° (45°), linearly
derated to 0.3A at 176° (80°)
—
E51SCN
DC 10 – 30V DC 2 complementary
outputs, line powered,
N.O. and N.C.
Reverse
polarity
0.6A to 104° (40°), linearly
derated to 0.36A at 176° (80°)
NPN
E51SNL
PNP
E51SPL
Type Description Timing
Range
Catalog
Number
ON Delay Adjustable delay between time
object is sensed and time switch
function occurs
0.15 to 15.0
seconds
E51MTE
OFF Delay Adjustable delay between time
object leaves sensing field and
time switch transfers back to
non-sensing state
0.15 to 15.0
seconds
E51MTD
ON and OFF
Delay
Combination of above 0.15 to 15.0
seconds
E51MTB
Delayed
Single Shot
Adjusts length of time switch
remains on ON cycle after object
is sensed regardless of length of
time object stays in sensing field.
ON cycle can also be delayed
after object is first detected
0.15 to 15.0
seconds
E51MSS
E51SCN
Shown
Reset time is 25 mS minimum.
Rated NEMA 4, 4X and 13.
6
PG.05D.11.T.E
May 2001
Model Selection — Receptacles
Black receptacle is for color compatibility with E51SCN sensor body.
Description Style Details Cable Length Catalog Number
Conduit Entrance
1/2” NPT 20 mm
Surface Mount Conduit entrance, front or rear
mounting
2-wire, AC/DC — —
E51RA E51RA20
4-wire, AC Gray —
E51RC E51RC20
Black
—
E51RCB E51RCB20
4-wire, DC — —
E51RN E51RN20
Mini-Connector Epoxy filled receptacle with
prewired Mini-Connector
2-wire, AC/DC 3-pin —
E51RAP3
—
4-wire, AC 5-pin —
E51RCP5
—
4-wire, DC 5-pin —
E51RNP5
—
Pigtail with Mini-Connector Epoxy filled receptacle with
Mini-Connector mounted on 3 foot
(900 mm) cable
2-wire, AC/DC 3-pin 3 feet (0.9m)
E51RAPT3
—
4-wire, AC 5-pin 3 feet (0.9m)
E51RCPT5
—
4-wire, DC 5-pin 3 feet (0.9m)
E51RNPT5
—
Prewired Cable Epoxy filled receptacle with
prewired 16 gauge, yellow jacketed,
type SOOW-A cable. Cable enters
through hole threaded for conduit
2-wire, AC/DC 3-conductor 8 feet (2.4m)
E51RAS E51RA20S
12 feet (3.6m)
E51RAS12
—
20 feet (6m)
E51RAS20
—
4-wire, AC 5-conductor 8 feet (2.4m)
E51RCS E51RC20S
12 feet (3.6m)
E51RCS12
—
20 feet (6m)
E51RCS20
—
4-wire, DC 5-conductor 8 feet (2.4m)
E51RNS E51RN20S
12 feet (3.6m)
E51RNS12
—
20 feet (6m)
E51RNS20
—
Inductive Proximity Sensors
E51 Limit Switch Style, Modular
PG.05D.11.T.E
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May 2001
Wiring Diagrams
(Pin numbers are for reference, rely on pin location when wiring)
Changing output switch on sensor head will reverse output function (N.O. becomes N.C., and N.C. becomes N.O.).
Model Selection — Accessories
Operating Voltage Output Terminal and Calbe Models Mini-Connector Models (Face View Male Shown)
2-Wire Sensors
20 – 264V AC or DC
50/60 Hz
N.O. or N.C. (N.O. shown, can be
changed to N.C. using switch on
sensor head)
4-Wire Sensors
120V AC
50/60 Hz
N.O. and N.C.
10 – 30V DC N.O. and N.C.
NPN
N.O. and N.C.
PNP
Description Catalog
Number
Approximate Dimensions in Inches [mm] Except as Noted
Universal Mounting Bracket 1 hole, includes mounting hardware,
stainless steel
E51KH2
Universal Mounting Bracket 2 hole, includes mounting hardware, steel
E51KH4
Inductive Proximity Sensors
E51 Limit Switch Style, Modular
21
43
L2
or (-)
L1
or +V Load
Black
White
Green
21
43 L2
L1
Load
Load
Black White
Orange
Red
Green
Load
Load
N.C. N.O.
L2 L1
21
43 (-)
+V
Load
Load
Black White
Orange
Red
Green
(-) +V
Load
Load
N.O.
N.C.
21
43 (-)
+V
Load
Load
Black White
Orange
Red
Green
(-) +V
Load
Load
N.C. N.O.
L1 or
(-) L2
or +V
Load
8
PG.05D.11.T.E
May 2001
Inductive Proximity Sensors
E51 Limit Switch Style, Modular
Model Selection — Accessories (Continued)
Description Catalog
Number
Approximate Dimensions in Inches [mm] Except as Noted
Machine Mounting Bracket Zinc die cast construction
E50KH3 NOTE:
Dimensions in mm [Inches]
Stand-Off Mounting Bracket Steel construction
E51KH3 NOTE:
Dimensions in mm [Inches]
Remote Sensor Head Assembly Permits mounting sensor head up to 3 feet
(0.9m) from sensor body
E51KRM
Connector Cables A variety of cables, connector blocks and
accessories
See
PG.05.05.T.E
PG.05D.11.T.E
9
May 2001
Specifications
Approximate Dimensions in mm [Inches]
Output Rating (NEMA D150)
AC/DC Models
AC Models
DC Models
0.5A continuous
1A continuous
0.6A continuous
Protection Latching short circuit protection on 2-wire AC/DC and 4-wire DC models
Switching Rate AC models: 15 Hz; DC models: 50 Hz
Indicator LEDs Lights when output is ON. One LED for each output
Alternate Frequency Standard and alternate frequencies allow side-by-side operation without interference
Enclosure Material Zinc die cast
Gasket Material Viton
Enclosure Ratings NEMA 3, 3S, 4, 4X, 6, 6P, 12 and 13 (IP67)
E51SCN Sensor Body only: NEMA 4, 4X and 13
Hazardous Locations Ratings
Class I
Class II
Class III
Division II — GRPS ABCD
Division II — GRPS F and G
Division 2
Temperature Range -13° to 158°F (-25° to 70°C)
Torque Requirements Switch Body Screws: 25 – 30 in-lb; Sensing Head Screws: 14 – 18 in-lb
Inductive Proximity Sensors
E51 Limit Switch Style, Modular
Standard, Ferrous and Non-ferrous Sensors Sensor with Logic Module
Can accommodate both U.S., 29.4 [1.16] x 59.5 [2.34] and DIN,
30 [1.18] x 60 [2.36], mounting dimensions.
Can accommodate both U.S., 29.4 [1.16] x 59.5 [2.34] and DIN,
30 [1.18] x 60 [2.36], mounting dimensions.
