TURCK NAMUR Proximity Sensors are 2-wire sensing devices meeting the interoperability requirements of EN 60947-5-6. Because NAMUR sensors operate on very low power, they can be designed to be intrinsically safe for use in hazardous locations. Turck NAMUR compliant sensors have intrinsic safety approval from FM, CSA, ATEX and others.
The operation of NAMUR sensors is similar to that of a variable resistor, with a change of impedance as a target approaches the sensor. When no metal is being sensed, an inductive sensor is in a low impedance state and draws a current of more than 2.2 mA. When a metal target enters the high-frequency field radiated from
the sensor face, the impedance increases as the target approaches. When fully damped, the sensor draws less than 1.0 mA. This current change is used to trigger an external amplifier at a defined switch point, usually about 1.5 mA.
NAMUR sensors contain a relatively small number of components, which allows the construction of small devices and helps to ensure a high degree of reliability. As the sensors are 2-wire current loops with fairly low impedance, they are unaffected by most transients.
General NAMUR Specifications
Differential Travel (Hysteresis): 1-10% (5% typical)
Nominal Voltage: 8.2 VDC (EN60947-5-6)
Resistance Change from
Nonactivated to Activated Condition: typical <1.0 to >8.0 kΩ
Resulting Current Change: ≥2.2 mA to ≤1.0 mA
Recommended Switching Point
for Remote Amplifier: >1.2 to <2.1 mA, typ. 1.55 mA ON/1.75 mA OFF
Power-On Effect: Realized in Amplifier
Reverse Polarity Protection: Incorporated
Wire-Break Protection: Realized in Amplifier
Transient Protection: Realized in Amplifier
Shock: 30 g, 11 ms
Vibration: 55 Hz, 1 mm Amplitude in all 3 Planes
Repeatability: ≤2% of Rated Operating Distance
See TURCK Sensors Catalog for detailed individual specifications for all NAMUR sensors.
TURCK NAMUR proximity sensors are functionally compatible with all switch amplifiers with input characteristics that meet the NAMUR requirements. Their approved intrinsic safety entity parameters are compatible with all TURCK safety switch amplifiers and remote I/O systems. See Section B, IS Interface Technology, and Section C, IP 20 Slice I/O, for more information.
Class I, Division 2 Hazardous Area Sensors
TURCK 3-wire DC proximity sensors with code AN6., AP6., RN6., or RP6. with threaded barrels are approved by FM Approvals for installation in Class I, Division 2 hazardous locations. The sensors must be installed using a Division 2 wiring method, which, for all practical purposes, means that the sensor must be either installed in an enclosure that requires the use of a tool to open, or they must be adapted to a raceway or conduit product. TURCK TMF conduit adapters or other suitable thread adapters may be used for this purpose.
When installed in this fashion and powered from a supply not exceeding 30 VDC, there are no further energy limiting or protective enclosure requirements for installation in Class I, Division 2. The sensors have no arcing or sparking components and will not dissipate heat under normal operating conditions.
|Part Number||ID Number||Barrel Diameter||Dimensions|
|TMF 12-G||A3310||12 mm||1.15 [29.2]||1.00 [25.4]||1.00 [25.4]||0.50 [12.7]||0.50 [12.7]||M12x1|
|TMF 18-G||A3320||18 mm||1.15 [29.2]||1.00 [25.4]||1.00 [25.4]||0.50 [12.7]||0.50 [12.7]||M18x1|
|TMF 30-G||A3345||30 mm||1.73 [44.0]||1.50 [38.1]||1.00 [25.4]||0.60 [15.2]||0.40 [10.2]||M30x1.5|
|Use above Conduit Adapters with G and P Barrel sensors.|
|TMF 18-MS||A3330||18 mm||1.15 [29.2]||1.00 [25.4]||2.00 [50.8]||1.50 [38.1]||0.50 [12.7]||M18x1|
|TMF 30-MS||A3355||30 mm||1.73 [44.0]||1.50 [38.1]||2.00 [50.8]||0.60 [15.2]||1.40 [35.6]||M30x1.5|
|Use above Conduit Adapters with M and S Barrel sensors.|