Capacitive Proximity Sensors

Transcription

1 Capacitive Proximity Sensors Capacitive proximity sensors High level of temperature stability Enhanced sensing ranges for functional reserve High level of immunity against: - Electrostatic discharge, e.g. in plastic or wood production - Electromagnetic interference, e.g. caused by radio transceivers and mobile telephones - Interference surge voltage caused by switching devices or solenoid valves - Conducted high frequency, e.g. frequency converters or switched-mode power supplies INDUSTRIAL SENSORS CATALOG SICK, Inc.

2 Table of Contents Capacitive Proximity Sensors Theory of Operations Selection Table 6 8 CM Series CM8 CM0 0 CQ series CQ8 CQ SICK, Inc. INDUSTRIAL SENSORS CATALOG 5

3 Theory of Operation...Capacitive Proximity Sensors Active surface Sensing flag RC-oscillation circuit Signal analyzer Switch amplifier Fig. Capacitive proximity sensor makeup I U Damped Fig. Damped vs. undamped materials The most important reduction factors for capacitive proximity sensors are: iron, earthed.0 water.0 (corn) (moisture content %) wood glass oil 0. PVC 0. PE 0.7 ceramic material 0. The reduction factor depends on the water content of the material. Sensing flag Undamped Fig. Reduction factors for capacitive proximity sensors EMC-overview s n About Capacitive Proximity Sensors The active element of a capacitive proximity sensor is formed by two metallic electrodes positioned much like an "opened" capacitor (see Fig. ). Electrodes A and B are placed in the feedback loop of a high frequency oscillator. When no target is present, the sensor s capacitance is low, therefore the oscillation amplitude is small. When a target approaches the face of the sensor, it increases the capacitance of the capacitor. This increase, in return, increases the amplitude of oscillation. The amplitude of oscillation is measured by an evaluating circuit that generates a signal to turn the output ON or OFF. Capacitance (C) is a function of the surface area of either electrode (A), the distance between the electrodes (d), and the dielectric constant of the material (e) between the electrodes. Test Standard Product Generic SICK Standard Standard Capacitive EN EN Sensors Electrostatic EN kv cd / 8 kv ad* kv cd78 kv ad* 7 kv cd/ad* Discharge ESD (IEC 000--) HF radiated EN V/m 0 V/m < 5 V/m (IEC 000--) MHz MHz MHz HF wire EN V > 0 V conducted (IEC ) 0, MHz Burst EN kv kv kv (IEC 000--) Surge IEC 55-5 kv, 500 Ohm -.5 kv, 500 Ohm *cd = contact discharge ad = air discharge When a conductive target enters the sensor s field, it forms a counter electrode to the active face of the sensor, thus decreasing the distance between the electrodes (d), and increasing the average surface area (A) of the electrodes. The capacitance with a metal target present is always greater than the capacitance of the circuit in the absence of the target. Reduction factors for different metals are not a consideration when using capacitive sensors (see Fig. ). When a non-conductive target enters the sensor s field, it acts as an electrical insulator between electrodes. The dielectric constant of the material (e symbol) is a measure of its insulation properties. All liquids and solids have a greater dielectric constant than air (e symbol = ). Therefore, the capacitance with a non-metallic target present is always greater than the capacitance of the circuit in the absence of the target. This change is nevertheless very small, so only a short sensing range can be achieved. The nominal sensing ranges refer, as with inductive sensors, to a metal target (mild steel). On different materials, different sensing ranges apply. 6 INDUSTRIAL SENSORS CATALOG SICK, Inc.

4 Capacitive Proximity Sensors...Type Code O SICK, Inc. INDUSTRIAL SENSORS CATALOG 7

5 Selection Table...Capacitive Proximity Sensors Capacitive Proximity Sensors Sensor Type Housing Sensing Range Switching -Wire s n in mm Output Design Size in mm Material Shielded Unshielded PNP NPN AC CM 8 Capacitive CM 8-PTFE Capacitive CM 0 Capacitive CM 0 Capacitive AC CQ 8 Capacitive CQ 5 Capacitive Barrel, threaded M8 Plastic 8 Barrel, threaded M8 PTFE 8 Barrel, threaded M0 Plastic 6 5 Barrel, threaded M0 Plastic 6 5 Rectangular, flat Plastic 0 Rectangular Plastic 5 8 INDUSTRIAL SENSORS CATALOG SICK, Inc.

6 Selection Table...Capacitive Proximity Sensors Capacitive Proximity Sensors Sensor Type Output Connection Enclosure Page Function Type Rating NO NC NO/NC Cable Connector Terminals CM 8 Capacitive CM 8-PTFE Capacitive CM 0 Capacitive CM 0 Capacitive AC CQ 8 Capacitive CQ 5 Capacitive Please note: NO = normally open NC = normally closed NO/NC = IP SICK, Inc. INDUSTRIAL SENSORS CATALOG 9

7 CM 8 Capacitive Capacitive Proximity Sensors Highlights CM 8 Capacitive High EMC-immunity Shielded or unshielded PNP or NPN output Adjustable sensing range Complementary output function Dimensional drawing Short-circuit protection (pulsed) Plastic housing with fine thread M8 x mm Cable or connector enclosure rating LED status indicator dimensions in mm Accessories page Cables and connectors 80 Mounting systems 0 INDUSTRIAL SENSORS CATALOG SICK, Inc.

8 Electrical and mechanical data Operating voltage U b Ripple U pp Voltage drop U b Power consumption (without load) Continuous current I a Time delay before availability t v Hysteresis H Repeatability R (U b and T a constant) Temperature drift EMC Short-circuit protection (pulsed) Reverse polarity protection Power-up pulse suppression Enclosure rating to EN 6059 Shock and vibration stress Ambient temperature T a Housing material Tightening torque Connection cable V DC 0% of U b.5 V 0 ma 00 ma 00 ms % - 0% of s r 5% of s r ± 0% of s r to EN g, ms, 0 to 55 Hz, mm...76 F ( C) Plastic.6 Nm PVC, x 0. mm Selection table Sensing Installation Switching Output Switching Connection type Type Part no. range S n in metal output function frequency f in (mm) in Hz 0. (8) PNP 0 Cable m CM8-08BPP-KW (8) PNP 0 Connector M x mm CM8-08BPP-KC (8) NPN 0 Cable m CM8-08BNP-KW (8) NPN 0 Connector M x mm CM8-08BNP-KC () PNP 0 Cable m CM8-NPP-KW () PNP 0 Connector M x mm CM8-NPP-KC () NPN 0 Cable m CM8-NNP-KW () NPN 0 Connector M x mm CM8-NNP-KC Connection diagram PNP bn bk wh + DC NPN bn bk wh + DC bu _ bu _ Wire Color Contact Assignment bn brown + V DC bk black NO wh white NC bu blue - V DC SICK, Inc. INDUSTRIAL SENSORS CATALOG

9 CM 8-PTFE Capacitive Capacitive Proximity Sensors CM 8 Capacitive Highlights High EMC-immunity Shielded PNP or NPN output Adjustable sensing range Complementary output function Dimensional drawing Short-circuit protection (pulsed) PTFE housing with fine thread M8 x mm, PVC cable enclosure rating LED status indicator dimensions in mm Accessories page Mounting systems INDUSTRIAL SENSORS CATALOG SICK, Inc.

10 Electrical and mechanical data Operating voltage U b Ripple U pp Voltage drop U b Power consumption (without load) Continuous current I a Time delay before availability t v Hysteresis H Repeatability R (U b and T a constant) Temperature drift EMC Short-circuit protection (pulsed) Reverse polarity protection Power-up pulse suppression Enclosure rating to EN 6059 Shock and vibration stress Ambient temperature T a Housing material Tightening torque Connection cable V DC 0% of U b.5 V 0 ma 00 ma 00 ms % - 0% of s r 5% of s r ± 0% of s r to EN g, ms, 0 to 55 Hz, mm...0 F ( C) PTFE.6 Nm PVC, x 0. mm Selection table Sensing Installation Switching Output Switching Connection type Type Part no. range S n in metal output function frequency f in (mm) in Hz 0. (8) PNP 0 Cable m CM8-08BPP-TWO (8) NPN 0 Cable m CM8-08BNP-TWO Connection diagram PNP bn bk wh + DC NPN bn bk wh + DC bu _ bu _ Wire Color Contact Assignment bn brown + V DC bk wh black white NO NC bu blue - V DC SICK, Inc. INDUSTRIAL SENSORS CATALOG

11 CM 0 Capacitive Capacitive Proximity Sensors Highlights CM 0 Capacitive High EMC-immunity Shielded or unshielded PNP output Adjustable sensing range Complementary output function Dimensional drawing Short-circuit protection (pulsed) Plastic housing with fine thread M0 x.5 mm Cable or connector enclosure rating LED status indicator dimensions in mm Accessories page Cables and connectors 80 Mounting systems INDUSTRIAL SENSORS CATALOG SICK, Inc.

12 Electrical and mechanical data Operating voltage U b Ripple U pp Voltage drop U b Power consumption (without load) Continuous current I a Time delay before availability t v Hysteresis H Repeatability R (U b and T a constant) Temperature drift EMC Short-circuit protection (pulsed) Reverse polarity protection Power-up pulse suppression Enclosure rating to EN 6059 Shock and vibration stress Ambient temperature T a Housing material Tightening torque Connection cable V DC 0% U b.5 V 0 ma 00 ma 00 ms % - 0% of s r 5% of s r ± 0% of s r to EN g, ms, 0 to 55 Hz, mm...76 F ( C) Plastic 7.5 Nm PVC, x 0. mm Selection table Sensing Installation Switching Output Switching Connection type Type Part no. range S n in metal output function frequency f in (mm) in Hz 0.6 (6) PNP 50 Cable m CM0-6BPP-KW (6) PNP 50 Connector M x mm CM0-6BPP-KC (6) NPN 50 Cable m CM0-6BNP-KW (6) NPN 50 Connector M x mm CM0-6BNP-KC (5) PNP 50 Cable m CM0-5NPP-KW (5) PNP 50 Connector M x mm CM0-5NPP-KC (5) NPN 50 Cable m CM0-5NNP-KW (5) NPN 50 Connector M x mm CM0-5NNP-KC Connection diagram PNP bn bk wh + DC NPN bn bk wh + DC bu - bu - Wire color Contact Assignment bn brown + V DC bk black NO wh white NC bu blue - V DC SICK, Inc. INDUSTRIAL SENSORS CATALOG 5

13 CM 0 Capacitive AC Capacitive Proximity Sensors Highlights -wire, 50 V AC High EMC immunity Complementary output function in ( 6 mm) in ( 5 mm) sensing range enclosure rating LED status indicator, yellow CM 0 AC Dimensional drawing dimensions in mm 5 M0x Cable, m Potentiometer Switch NO/NC Display LED Fastening nuts ( x); width across 6 mm, plastic Accessories page Mounting systems Order information Type Part no. CM0-6BAP-KW 6 08 CM0-5NAP-KW INDUSTRIAL SENSORS CATALOG SICK, Inc.

14 Electrical and mechanical data CM0-6BAP -KW 5NAP -KW Sensing range S n Operating voltage U b 0.6 in (6 mm).0 in (5 mm) 0 65 V AC Ripple U pp Voltage drop U b ) Off state current ) Continuous current I a Time delay before availability t v Hysteresis H Repeatability R ) Temperature drift EMC Output function Installation type Connection type 0% U b 0 V AC (at load 0 ma) 0 ma 500 ma 00 ms 0% of s r 5% of s r ± 0% of s r To EN NO NC Complementary Flush Non-flush Cable, m, PVC, x 0.5 mm, oil resistant Enclosure rating ) Switching frequency f Dimensions 5) Reverse polarity protection Power-up pulse suppression Shock and vibration stress Ambient temperature T a Housing material Tightening torque ) At I a max. ) Without load ) U b and T a constant Max. 0/s M0 x.5 0 g, ms/0 55 Hz, mm - 76 F (-5 80 C) Polyester 7.5 Nm ) To EN ) Thread diameter x pitch (mm) Connection diagram CM0-6BAP-KW CM0-5NAP-KW x 0.5 mm brown L blue load N AC V wire colors refer to standard cable, not included with quick disconnect models SICK, Inc. INDUSTRIAL SENSORS CATALOG 7

15 CQ8 Capacitive Capacitive Proximity Sensors Highlights Thin profile: 8 x 6 x 5.5 mm (w x h x d) Adjustable sensing range: 0 mm, non-flush Short-circuit and reverse polarity protection Teach-in via button or COM-input High EMC-immunity PNP or NPN output IP 68 enclosure rating CQ8 Capacitive Dimensional drawing dimensions in mm Connection Display LED Potentiometer Accessories page Cables and connectors 80 Mounting systems 8 INDUSTRIAL SENSORS CATALOG SICK, Inc.

16 Electrical and mechanical data CQ8 0NNP- KW 0NPP- KW Electrical configuration Operating voltage U b Ripple U pp Voltage drop U b at l a max Power consumption (without load) Continuous current I a (max) Time delay before availability t v Hysteresis H Repeatability R (U b and T a constant) Temperature drift EMC Switching output Output function Installation Short-circuit protection Reverse polarity protection Enclosure rating to EN 6059 Dimensions (w x h x d) Shock and vibration stress Ambient temperature operation Ambient temperature storage Housing material Connection type DC -wire 0 0 V DC 0%.5 V ma 00 ma 00 ms Depending on teach adjustment of s r 5% of s r ± 0% of s r to EN NPN PNP Programmable (NO, NC)Non-flush IP 68 8 x 6 x 5.5 mm 0 g, ms, 0 to 55 Hz, mm - 85 F ( C) F ( C) Plastic, PBT Cable, PVC, m Selection table Sensing Switching Output Switching Connection type Type Part no. range S n output function frequency in (mm) in Hz 0. (0) PNP 0 Cable m CQ8-0NPP-KW (0) NPN 0 Cable m CQ8-0NNP-KW 6 00 Connection diagram ( x 0. mm ) CQ8-0NNP-KW CQ8-0NPP-KW brn wht blk blu + V DC Teach Q V DC SICK, Inc. INDUSTRIAL SENSORS CATALOG 9

17 CQ 5 Capacitive Capacitive Proximity Sensors CQ 5 Capacitive Highlights High EMC-immunity Shielded or unshielded PNP or NPN output Adjustable sensing range Device can be flush mounted, sensing range: 6 mm Dimensional drawing Complementary output function Short-circuit protection (pulsed) Plastic housing Cable or connector enclosure rating LED status indicator dimensions in mm Accessories page Cables and connectors 80 0 INDUSTRIAL SENSORS CATALOG SICK, Inc.

18 Electrical and mechanical data Operating voltage U b Ripple U pp Voltage drop U b Power consumption (without load) Continuous current I a Time delay before availability t v Hysteresis H Repeatability R (U b and T a constant) Temperature drift EMC Short-circuit protection (pulsed) Reverse polarity protection Power-up pulse suppression Enclosure rating to EN 6059 Shock and vibration stress Ambient temperature T a Housing material Connection cable V DC 0% of U b.5 V 0 ma 00 ma 00 ms % - 0% of s r 5% of s r ± 0% of s r to EN g, ms, 0 to 55 Hz, mm F ( C) Plastic PVC, x 0. mm Selection table Sensing Installation Switching Output Switching Connection type Type Part no. range S n in metal output function frequency f in (mm) in Hz.0 (5) * PNP 50 Cable m CQ5-5NPP-KW (5) * PNP 50 Connector M x mm CQ5-5NPP-KC (5) * NPN 50 Cable m CQ5-5NNP-KW (5) * NPN 50 Connector M x mm CQ5-5NNP-KC *Can be installed flush by reducing sensitivity with potentiometer Connection diagram PNP bn bk wh + DC NPN bn bk wh + DC bu - bu - Wire color Contact Assignment bn brown + V DC bk black NO wh white NC bu blue - V DC SICK, Inc. INDUSTRIAL SENSORS CATALOG