Namco Controls Namur Sensor Application Information

S

ions

NAMUR
Sensors

Hazardous Location
Sensor Systems

PWR

Ch 1

O/P

FAIL

Ch 2

NAMUR refers to the standards
committee of measurement and control
of the chemical industry of Europe.
Namco sensors comply with DIN 19234
and therefore are compatible with the
NAMUR requirements.

NAMUR sensors are typically used
for hazardous location sensing in areas

Connector Circuit Housing Housing Shielded Unshielded

Type Description Material Length Model No. Model No.

6.5mm Diameter NAMUR 5-25 VDC Smooth

6.6' Cable Analog Metal 30mm ET112-00310 — 1mm — N/A 1KHz — N/A

8mm Diameter NAMUR 5-25 VDC

6.6' Cable Analog Metal 30mm ET112-10310 — 1mm — N/A 1KHz — N/A

12mm Diameter NAMUR 5-25 VDC

6.6' Cable Analog Metal 30mm ET112-20310 ET112-21310 2mm 4mm N/A 800Hz 400Hz N/A

6.6' Cable Analog Plastic 30mm ET212-20310 ET212-21310 2mm 4mm N/A 800Hz 400Hz N/A

18mm Diameter NAMUR 5-25 VDC

6.6' Cable Analog Metal 30mm ET112-30310 ET112-31310 5mm 8mm N/A 500Hz 200Hz N/A

6.6' Cable Analog Plastic 30mm ET212-30310 ET212-31310 5mm 8mm N/A 500Hz 200Hz N/A

30mm Diameter NAMUR 5-25 VDC

6.6' Cable Analog Metal 40mm (Sh) ET112-40310 ET112-41310 10mm 15mm N/A 300Hz 250Hz N/A

6.6' Cable Analog Plastic 40mm ET212-40310 ET212-41310 10mm 15mm N/A 300Hz 250Hz N/A

Small Rectangular NAMUR 5-25 VDC

pecial Application Solut

6.6' Cable Analog Plastic 12x26x40mm ET912-10310 ET912-11310 2mm 4mm N/A 800Hz 400Hz N/A

42mm (UnSh)

that require extremely compact sensors.
Namur Sensors are not stand-alone
sensors unless your control system input
is capable of determining current
change. Unlike most other sensors, the
Namur Sensor uses very low voltage as a
source and changes the current passed
through as a function of how close the

Sensing

Range

Shielded Unshielded

target is to the sensing coil. Namur
sensors are used with either stand-alone
amplifiers or Namur specific PLC input
cards. When used in a hazardous
location, an appropriate barrier is
required.

Maximum

Maximum

Load

Current

Switching
Frequency

Shielded Unshielded

Short

Circuit

Protected

Please consult factory for other versions.

Protected by the

Lifetime Replacement Program

142

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ions

Common Sensor Characteristics

(-)

(+)

1.20" (30.0)

Metal Shielded

Plastic Shielded & Unshielded

0.90" (22.0)
Metal

Unshielded

NAMUR DC SENSORS

Shielded Sensing Range 6.5mm: 1mm

8mm: 1mm
12mm: 2mm
18mm: 5mm
30mm: 10mm
Sm. Rec.: 2mm

Unshielded Sensing Range 8mm: 2mm

12mm: 4mm
18mm: 8mm
30mm: 15mm
Sm. Rec.: 4mm

Shielded Standard Target 6.5mm: 8x8x1
(mm) (mild steel) 8mm: 8x8x1

12mm: 12x12x1
18mm: 18x18x1
30mm: 30x30x1
Sm. Rec.: 12x12x1

Unshielded Standard Target 8mm: 8x8x1
(mm) (mild steel) 12mm: 12x12x1

18mm: 24x24x1
30mm: 45x45x1

Sm. Rec.: 16x16x1
Repeatability 2%
Hysteresis 3-8% (typ.); 15% (max.)
Temperature Drift (Max.) ±15%
Ambient Temperature Range -13˚F to +158˚F
Current Consumption N/A
NEMA Rating 1, 3, 4, 6, 13
LED Indicator N/A
Metal Housings Chromed Brass
Plastic Housings Ultradur®
Shipping Weight 6.5mm: 8 oz.

8mm: 8 oz.

12mm: 8 oz.

18mm: 8 oz.

30mm: 10 oz.

34mm: 11 oz.

Flat Pack: 5 oz.

(Add 5 oz. for Cable model)

Dimensional Drawings

6.5mm DIAMETER SENSOR

8mm DIAMETER SENSOR

12mm DIAMETER SENSOR

18mm DIAMETER SENSOR

30mm DIAMETER SENSOR

1.57" (40.0)

Metal Shielded

Plastic Shielded & Unshielded

NAMUR

1.18"

(30.0)

1.20" (30.0)
Shielded

1.18" (30.0)

Metal Shielded

Plastic Shielded & Unshielded

0.91" (23.0)

Metal Unshielded

1.18" (30.0)

Metal Unshielded

Special Application Solut

Circuit Drawings

SENSOR WIRING DIAGRAM

1.65"

(42.0)

Small Rectangular SENSOR

1.57"

(40.0)

0.47"

(12.0)

2013 West Meeting Street • Lancaster, SC 29720

LED

1.02"

(26.0)

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143

S

ions

Intrinsically

Hazardous Location

Safe

Sensor Systems

For use in:
Class I - Groups A, B, C, & D
Class II - Groups E, F, & G

The EE931 Hazardous Location
sensor system is excellent for sensing of
position in paint spray booths, belt slip
on conveyors, or anywhere that explosion
proof switches are normally used. Since
the EE931 system is intrinsically safe, no
special housings are required to contain
any potential flame. Intrinsic Safety is
obtained by design of the product such
that extremely limited energy is available
in the hazardous location. For this
reason, these Namco sensors must only
be used with the Namco control module.
It is possible, however, to use the Namco
control module with either the Namco
sensors listed in this section or a
standard limit switch. (Limit switches
must be of the gold contact type due to
the low current and voltage supplied by
the control module.)

Sensors

Namco offers a variety of intrinsically
safe sensors for use in Class I, Groups A,
B, C, and D and Class II, Groups E, F, and
G hazardous locations. These EE931-

pecial Application Solut

series sensors must be used ONLY in
conjunction with Namco’s EE931-series
control modules. The hazardous location
sensors are completely encapsulated and
contain a transistor oscillator circuit.
Variations in oscillator amplitude caused

CONTROL MODULES

BARRIER

Hazardous

Hazardous

Hazardous

HAZARDOUS

AREA

An intrinsically safe proximity sensor system consists of a sensor, which is mounted in the
hazardous area, and a control module, which is mounted in the safe area.

by metallic objects passing in front of the sensor face
produce activation of the control module output.

Twenty feet of 18AWG oil resistant cable is provided
with tubular sensors, although up to 1000 feet can be
obtained for applications where the hazardous area is a
considerable distance away from the safe area control
panel. Sensors providing up to one inch of sensing range
are available.

Cylindicator® sensor versions are provided with 50 feet
of cable. For longer cable lengths, consult factory.

SAFE
AREA

Protected by the

Lifetime Replacement Program

Cylindicator® Sensors

Model Probe

No. Length

EE931-30101 0.950
EE931-30401 1.025
EE931-31301 1.250
EE931-38701 2.062
EE931-37801 2.875
EE931-39001 3.775

144

Tubular Sensors (See “Sensing Range” opposite page)

Sensing Range

Model

No.

EE931-56200 0.20" 0.25" 0.40" 3/4"-20 2 Cond.

EE931-76500 0.37" 0.25" 0.57" M30 x 1.5 2 Cond.

EE931-75100 1.00" 0.50" 2.50" M30 x 1.5 2 Cond.

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“A” “B”

Sensing Field Side

(5.0) (6.3) (10.1) 18 AWG SVO

(9.5) (6.3) (14.6) 18 AWG SVO

(25.4) (12.7) (63.5) 18 AWG SVO

“C” Cable

Mtg. Clear. Thread (20')

ions

Dimensional Drawings

90˚ ROTATABLE
CYLINDICATOR

®

SENSOR

1.09"
(27.7)

Dimensional Drawings

TUBULAR SENSOR – 3/4-20 THREAD
17mm SMOOTH BARREL

Model No.

1.38"

EE931-56200

2 COND/
18 AWG
SVO OR

SJO

BLACK (COMMON)

WHITE (+VDC)

1.25"

(28.6)

1/2-14 NPT

1.00" HEX
(25.4)

Side ViewTop View

0.59"

(15.0)

(2) 1/4-20 X 1 1/4"
SOC HD CAP
SCREWS
SUPPLIED

0.50"
(12.7)

(35.0)

3.30"

(83.8)

2.43"
(61.7)

SLOT FOR #10 SCREWS

3/4-20 UNEF

0.88"

(22.4)

1.51"

(38.4)

1.75"
(44.4)

PROBE

LENGTH

(SEE CHART)

Sensor Mounting

Sensors may be installed with mounting bracket furnished in
any position provided the sensor face is kept free of electrically
conductive material. See below for maximum sensing range and
pattern of minimum mounting distances from other conductive
materials for the EE931-series sensors.

See the Cylindicator section in this book for application
information on Cylindicator sensors.

Factors influencing sensing range are temperature, target size,
target material, and speed. For best all-around performance, use
“slide-by” actuation as opposed to “head-on” actuation. Target
should present as much surface area to the sensor face as practical.
Sensing of non-ferrous metals may reduce sensing range by as
much as 50%, depending on the type of material. Since the sensing
range of each sensor is fixed, no control module adjustment is
required. The target should be placed as close to the sensor face as
possible. Namco recommends setting the target at one-half the
“maximum” sensing range or closer for best system operation.

Sensing Range

"B"

LABEL

"B"

NOMINAL
SENSING
RANGE

PATTERN
OF MINIMUM
MOUNTING
CLEARANCE

ACTUAL
SENSING
RANGE

"A"

"C"

0.80"

(20.3)

0.40"

0.16"

(10.1)

(4.0)

1.00"

(25.4)

TUBULAR SENSOR – M 30x1.5
FULL THREAD

Model No.
EE931-76500

2C/18 AWG

SVO OR SJO

1.63"

(41.3)

WHITE
(+VDC)

(COMMON)

0.20" WIDE X 1.00" LONG SLOT

1.65"

(41.9)

FEMALE ENTRY

BLACK

2 HOLES

1.16"
(29.4)

LABEL

1/2-14 NPT

1.50"

(38.1)

3.54"

(89.9)

TUBULAR SENSOR – M 30x 1.5 THREAD
1" SMOOTH BARREL

Model No.
EE931-75100

0.03"

2 COND/18AWG

SVO OR SJO

CABLE

(0.76)

0.78"

(19.8)

1.16"
(29.4)

1.65"

(41.9)

0.20" (5.08) WIDE X 1.00" (25.4) LONG SLOT

1.50"

(38.1)

2 HOLES

3.78"

(96.0)

1-7/16" ACROSS

BLACK (COMMON)
WHITE (+VDC)

LABEL

Continued on

next page.

➟

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0.67"

(17.0)

LABEL

0.68"

(17.2)

0.36"
(9.1)

1.09"

(27.7)

X

1.5 THREAD

M30

0.78"

(19.8)

1.44"

(36.6)

ACROSS

FLATS

2.20"

(55.9)

1.00"
(25.4)

M30 X 1.5 THREAD

(36.6) FLATS

1.625"
(41.3)

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Special Application Solut

For technical assistance, call 1-800-NAMTECH

145

S

ions

Intrinsically

Hazardous Location

Safe

Sensor Systems

Control Modules

The EE931-series control modules
are designed to be mounted in the safe
area. These modules provide limited
energy to Namco’s line of hazardous
location sensors described on the
previous pages. The control modules are
housed in high impact Lexan® enclo­sures and are equipped with eight screw
terminals (#8 stud size) for ease of
installation. The EE931-02103 module
provides an electro-mechanical relay
output (One Form C), while the EE931­02303 unit has a photo-darlington (open
collector) output for higher speed
requirements. The outputs become
energized when a metallic target is
present in front of the associated sensor.

Control Module Mounting:

The EE931-series control module

should be panel mounted in the safe
area where it will be protected from

physical damage, dirt, and vibration. The
location should be established within the
limits of the sensor cable. The unit can be
mounted vertically or horizontally using
two No. 8 screws. When mounting with
only two screws, it is imperative to use

the two mounting holes provided with
brass eyelet inserts. This method

provides an additional ground path for
the electronic circuit contained in the
module. The ambient temperature range
should be from -40°F to +158°F. The
physical construction of the control
module housing insures a separation of
at least two inches between intrinsically
safe terminals (5 and 6) and non­intrinsically safe terminals (7 thru 12).

It is important when installing the sensor
cable to the control unit terminals (5 and

6) to maintain this minimum spacing of
two inches. A separate wiring duct is
required to insure that the intrinsically
safe sensor cable does not become
intermingled with non-intrinsically safe
wiring due to vibration. A separate
conductor MUST be wired from Terminal
9 to earth ground to insure intrinsic
safety of the system. Terminal 8 is for
the neutral side of AC line. Terminal 7 is
hot side of AC line and MUST be wired
accordingly or intrinsic safety is voided.

Namco advises that the Instrument
Society of America Specification RP12.6,
which gives the recommended practice
for installation of intrinsically safe
systems, be followed when using the
EE931-series control modules and
sensors.

pecial Application Solut

146

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ions

Dimensional Drawing

123456

4.00"

(101.6)

3.25"

(82.5)

#8 - 32 X 5/16"

SCREWS (8)

OUTPUT

INDICAT OR

0.73"

(18.5)

PRIMARY
MOUNTING
HOLES (WITH
BRASS
EYELETS)

LABEL

1.06"

(27.0)

3.00"

(76.2)

1.16"

(29.3)

CONTROL

MODULE

0.82"
(20.9)

0.27"
(6.8)

0.37" TYP
(9.5)

7 8 9 10 11 12

0.38" TYP
(9.6)

3.25"

(82.5)

0.37" TYP
(9.5)

4.00"

(101.6)

Circuit Drawings

RELAY OUTPUT PHOTO-DARLINGTON

OUTPUT

+

—

BLK

LOAD #1

WHT

CONTROL MODULE

MENTOR, OHIO 44060

INPUT

115VAC

50/60 HZ

2.5 VA

LINE NEUT.

CONTROL MODULE

MENTOR, OHIO 44060

INPUT

115VAC

50/60 HZ

2.5 VA

LINE NEUT.

TO HAZARDOUS LOCATION

INTRINSICALLY SAFE

®

EE931-02103

RATING

SPOT SWITCH

ONLY ONE
POLARITY
STD DUTY

120 VAC

OR SA RESISTIVE

GRND.

@ 120 VAC

SENSOR #1

OUTPUT
STATUS

+

EE931-02103 NON-HAZARDOUS
LOCATION CONTROL UNIT FOR
EE931-SERIES SENSORS USED IN
CLASS I GROUPS. A. B. C AND D;
CLASS II. GROUPS E. F. AND G
HAZARDOUS LOCATIONS.

RELAY OUTPUT

TO HAZARDOUS LOCATION

INTRINSICALLY SAFE

®

EE931-02303

RATING

RATING

24Vceo

MAX.

50 mA MAX.

GRND.

SENSOR #1

OUTPUT
STATUS

+

EE931-02303 NON-HAZARDOUS
LOCATION CONTROL UNIT FOR
EE931-SERIES SENSORS USED IN
CLASS I GROUPS. A. B. C AND D;
CLASS II. GROUPS E. F. AND G
HAZARDOUS LOCATIONS.

OUTPUT - PHOTO-DARLINGTON

LOAD #1

+

—

BLK

WHT

Common Control Module Characteristics

INTRINSICALLY SAFE CONTROL MODULE

EE931-02103 EE931-02303

Output Electro-Mechanical Photo-Darlington

Speed (Hz) 3 1400
Supply Voltage 120 VAC
Sensor Input Namco EE931-Series only
Ambient

Temperature
Case Material Lexan

SPDT Relay 50mA max.
Rated 5A Resist. @ 24 VAC
One form C Open Collector

-40˚F to +158˚F

Special Application Solut

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147