SICK 6021125 IM12-04N-N-ZW0 NAMUR NC Inductive Sensor

Technical Overview

The SICK IM12-04N-N-ZW0 is an M12 non-flush NAMUR inductive proximity sensor with a normally-closed output characteristic. It detects qualified metal targets at a nominal range of 4 mm and an assured range of 3.24 mm, subject to material reduction factors. Its two-wire current signal falls to no more than 1 mA when activated and is at least 2.2 mA when not activated. Switching frequency is 1500 Hz. The nickel-plated brass housing, plastic sensing face and 2 m PVC cable provide IP67 integration. The ATEX-listed device connects only to a separately certified intrinsically safe circuit for hazardous-area use, within the documented entity limits. The 7.5–25 V DC supply range applies outside hazardous areas.

M12 non-flush NAMUR NC sensor with 4/3.24 mm nominal/assured ranges, 1500 Hz switching and 2 m PVC cable; hazardous-area use requires a separately certified intrinsically safe circuit.

Key Features

M12 metric thread; non-flush installation

4 mm nominal range; 3.24 mm assured range

NAMUR normally-closed current-switching characteristic

Activated current ≤1 mA; not-activated current ≥2.2 mA

1500 Hz switching frequency

2 m PVC two-wire cable; 0.34 mm² conductors

ATEX certificate PTB 03 ATEX 2037; device category1G

Hazardous-area connection only to a separately certified intrinsically safe circuit

7.5–25 V DC outside hazardous areas; 8.2 V nominal at1 kΩ

Nickel-plated brass housing; plastic face; IP67; −20 to +70 °C

Technical Specification Matrix

Parameter	Value
Functional principle	Inductive metal proximity detection
Housing form	Metric cylindrical
Housing thread	M12 ×1
Body diameter	12 mm
Sensing range Sn	4 mm nominal
Assured sensing range Sa	3.24 mm
Installation	Non-flush
Switching output	NAMUR
Output function	Normally-closed (NC)
Switching frequency	1500 Hz
Connection	2 m two-wire cable
Conductor functions	Brown BN=L+; blue BU=M; CD-012
Power supply outside hazardous areas	7.5–25 V DC
Nominal voltage	8.2 V DC at1 kΩ
Activated current	≤1 mA
Not-activated current	≥2.2 mA
Hysteresis	1–15%
Temperature drift	±10% of Sr
EMC	EN60947-5-6
Cable material	PVC
Conductor cross-section	0.34 mm²
Cable diameter	4.9 mm
Cable resistance	50 Ω
Shock resistance	30 g,11 ms
Vibration resistance	10–55 Hz,1 mm
Operating temperature	−20 to +70 °C
Housing material	Nickel-plated brass
Sensing face material	Plastic
Housing length	30 mm
Maximum tightening torque	7 Nm
IP rating	IP67 per EN60529
Type approval certificate	PTB 03 ATEX 2037
Ex area categories	1G
Hazardous-area circuit condition	For connection only to a separately certified intrinsically safe circuit; match all certified circuit/entity limits
Entity input voltage Ui max	15 V; separately certified intrinsically safe circuit only
Entity input power Pi max	120 mW; separately certified intrinsically safe circuit only
Entity input current Ii max	50 mA; separately certified intrinsically safe circuit only
Internal capacitance Ci max	140 nF; separately certified intrinsically safe circuit only
Internal inductance Li max	130 µH; separately certified intrinsically safe circuit only
Device marking	II 1G Ex ia IIC T6 Ga, Ta−20 to+70 °C
MTTFD	7,577 years
Diagnostic coverage DCavg	0%
Mission time	20 years
Target-material reduction factors	Approximate reference values that may vary: V2A/304=0.7; aluminum=0.4; copper=0.3; brass=0.5
Mounting clearances	A=12 mm; B=24 mm; C=12 mm; D=12 mm; E=8 mm; F=32 mm; follow exact manufacturer installation diagram
Items supplied	Two nickel-plated brass mounting nuts
Nut width across flats	17 mm
Physical Weight (kg)	0.127

Parameter

Value

Functional principle

Inductive metal proximity detection

Housing form

Metric cylindrical

Housing thread

M12 ×1

Body diameter

12 mm

Sensing range Sn

4 mm nominal

Assured sensing range Sa

3.24 mm

Installation

Non-flush

Switching output

NAMUR

Output function

Normally-closed (NC)

Switching frequency

1500 Hz

Connection

2 m two-wire cable

Conductor functions

Brown BN=L+; blue BU=M; CD-012

Power supply outside hazardous areas

7.5–25 V DC

Nominal voltage

8.2 V DC at1 kΩ

Activated current

≤1 mA

Not-activated current

≥2.2 mA

Hysteresis

1–15%

Temperature drift

±10% of Sr

EMC

EN60947-5-6

Cable material

PVC

Conductor cross-section

0.34 mm²

Cable diameter

4.9 mm

Cable resistance

50 Ω

Shock resistance

30 g,11 ms

Vibration resistance

10–55 Hz,1 mm

Operating temperature

−20 to +70 °C

Housing material

Nickel-plated brass

Sensing face material

Plastic

Housing length

30 mm

Maximum tightening torque

7 Nm

IP rating

IP67 per EN60529

Type approval certificate

PTB 03 ATEX 2037

Ex area categories

Hazardous-area circuit condition

For connection only to a separately certified intrinsically safe circuit; match all certified circuit/entity limits

Entity input voltage Ui max

15 V; separately certified intrinsically safe circuit only

Entity input power Pi max

120 mW; separately certified intrinsically safe circuit only

Entity input current Ii max

50 mA; separately certified intrinsically safe circuit only

Internal capacitance Ci max

140 nF; separately certified intrinsically safe circuit only

Internal inductance Li max

130 µH; separately certified intrinsically safe circuit only

Device marking

II 1G Ex ia IIC T6 Ga, Ta−20 to+70 °C

MTTFD

7,577 years

Diagnostic coverage DCavg

Mission time

20 years

Target-material reduction factors

Approximate reference values that may vary: V2A/304=0.7; aluminum=0.4; copper=0.3; brass=0.5

Mounting clearances

A=12 mm; B=24 mm; C=12 mm; D=12 mm; E=8 mm; F=32 mm; follow exact manufacturer installation diagram

Items supplied

Two nickel-plated brass mounting nuts

Nut width across flats

17 mm

Physical Weight (kg)

0.127

Industrial Applications

1. Monitoring a valve actuator metal position flag

A valve actuator can move a qualified metal flag into the sensor range at a defined travel position. The 4 mm nominal range and non-flush mounting guide placement. Compatible NAMUR evaluating equipment interprets the activated and not-activated current states. Hazardous-area installations use a separately certified intrinsically safe circuit that matches the documented device entity limits.

Problem Solved

A local noncontact metal-flag condition gives external valve-control logic a travel-position reference without placing a mechanical sensing lever against the monitored moving actuator component during repeated operation.

Valve position NAMUR NC Current-state evaluation

2. Checking a metal component in a process fixture

A process fixture can present a qualified metal component to the sensing face at a defined assembly or handling position. The NAMUR current characteristic supplies a local presence condition to compatible external evaluating equipment. Target-material reduction factors guide qualification for different metals, and hazardous-area use requires a separately certified intrinsically safe circuit within the listed entity limits.

Problem Solved

A metal-presence condition helps external sequence control identify an empty monitored fixture position without relying on a visible surface mark or a contact probe against the component.

Fixture presence Metal targets NAMUR evaluation

3. Counting separated metal carrier features

A material-handling mechanism can move separated qualified metal features through the detection zone and send the NAMUR current transitions to compatible external counting equipment. Feature spacing and passage rate remain within the 1500 Hz switching frequency. The external evaluating circuit distinguishes the two current states; hazardous-area use also requires a separately certified intrinsically safe circuit.

Problem Solved

A qualified metal-passage event supports throughput tracking without a mechanical counting arm, while external equipment performs the count and coordinates the feed at the monitored process location.

Metal-feature counting 1500 Hz External counter