Proximity Sensors Capacitive Proximity Sensors FEATURES 1 Senses all materials 1 Threaded 18 mm diameter metal housings 1 Threaded 30 mm diameter metal and plastic housings 1 Sealed to IP 65 and IP 67 for industrial environments 1 Shielded and unshielded sensing 1 Electrical options: – 10-48 VDC 3-wire sensors provide current sinking or current sourcing operation – 90-250 VAC 2-wire sensors operate on line voltage and are as easy to wire as mechanical switches 1 Self-contained – no separate amplifier needed TYPICAL APPLICATIONS 1 Fill level detection in tanks 1 Package inspection for product content 1 Sense liquid level in sight glass or bottle 1 Detect powder or granular material in a hopper 1 Detect non-metallic objects on conveyor belts MICRO SWITCH 900 Series capacitive proximity sensors detect targets made of glass or grain, paper, wood or water. These sensors utilize an oscillating electric field which is sensitive to both non-conductive materials (glass, plastic, rubber, oil) and conductive materials such as metals and water. This flexibility adds solid state sensing reliability to many packaging and process control functions. Metal housings are available in 18 and 30 mm diameters. Shielded versions allow optimum sensing of non-conductive materials, including the ability to sense longer range than certain inductive devices. Plastic 30 mm housings are for conductive liquids. Review application information on pages B124 and B125 for more information. B76 Sensitivity adjustment is standard, allowing fine tuning to specific applications, the key to ‘‘seeing through’’ an object or material in order to sense another. The dielectric constant must be very low for material being ‘‘seen through’’. CAPACITIVE SENSOR TYPES UNSHIELDED (Plastic body) 1 Primarily used to detect conductive type materials (metal, water) at maximum distances. When detecting nonconductive materials, a path to ground is required. 1 Designed to sense conductive materials through a non-conductive material (i.e., water in a glass or plastic container). 972/973CP Series Shielded sensors are used when a path to ground does not always exist. By incorporating the ground electrode in the sensor, an electric field is created independently of any outside path to ground. The field functions the same as when the electrodes face each other. The shielded sensor can sense any material, grounded or ungrounded. Shielded sensors may be flush mounted in any solid material. NOTE: Capacitance sensors will not see through metal or a material thicker than the specified sensing range. Accessories for capacitive sensors include mounting brackets. See page B101. Conductive and non-conductive materials cause an increase in capacitance due to a dielectric change in comparison to air. The ground electrode is located directly across from the main electrode. This is not mechanically required, as a path to ground will accomplish the same thing. Unshielded sensors are often used for ‘‘looking through’’ a non-conductive material to control the level of a conductive material. An example is a plastic section in a tank drain pipe to indicate when tank is empty. SHIELDED (metal body) 1 General purpose to sense nonconductive type materials (wood, plastic, cardboard, glass). 1 Do not use in applications where condensing humidity could cause water droplets to form on the face of the shielded capacitive sensor. Water droplets on the face will cause the output to lock on. 1 Used when mounting considerations such as flush mounting and surrounding metals could impact the operation of the sensor. Honeywell 1 MICRO SWITCH Sensing and Control 1 1-800-537-6945 USA 1 F1-815-235-6847 International 1 1-800-737-3360 Canada Proximity Sensors Capacitive Preleaded Sensors 3-Wire DC, 2-Wire AC 972/973CP Series FEATURES 1 Sealed to IP 65 or IP 67 1 Adjustable sensitivity 1 –25 to +75° C (–13 to +158 °F) temperature range 1 Metal or plastic housings 1 Threaded and smooth housings ORDER GUIDE Sensor Package Style* 18 mm (.71 in.) Metal, IP 65 104,3g (3.68 oz) 30 mm (1.18 in.) Metal, IP 67 Sensor Type Sw. Freq. Output Type 8 (.31) Shielded 3-wire DC 100 Hz 15 (.59) Shielded 3-wire DC 15 (.59) Unshielded Mtg. Dim. Isolation Dwg. Catalog Listing PNP, N.O. A B C D 80/3.15 M18/.71 60/2.36 — e 36/1.42 r 9/.35 c Sr g 0 972CP8TM-A13P-L 100 Hz PNP, N.O. NPN, N.O. A B C D 100/3.94 M30/1.18 57/2.24 90/3,15 e 90/3.54 r 45/1.77 c Sr g 0 972CP15TM-A13P-L 972CP15TM-A13N-L 2-wire AC 10 Hz N.O. N.C. A B C D 100/3.94 M30/1.18 57/2.24 90/3,15 e 90/3.54 r 45/1.77 c Sr g 20/.79 973CP15TM-A11T-L 973CP15TM-B11T-L 3-wire DC 100 Hz A B C D 100/3.94 M30/1.18 57/2.24 80/3.15 e 90/3.54 r 45/1.77 c Sr g 20/.79 2-wire AC 10 Hz A B C D 100/3.94 M30/1.18 57/2.24 80/3,15 e 90/3.54 r 45/1.77 c Sr g 20/.79 NPN, N.O. N.O. Proximity 30 mm (1.18 in.) Plastic, IP 67 Sensing Range** mm (in.) 972CP15TP-A13N-L 973CP15TP-A11T-L * Metal housing: nickel-plated brass Plastic 30 mm diameter: Glass fiber reinforced Polybutylenterephthalate Operating point tolerance over +10 to + 70 °C: 15% ** Standard target: square of mild steel, 1 mm (.04in) thick. WIRE SPECIFICATIONS Cable Material PVC Wire Gauge – All types 22 Gauge Jacket O.D. 2-wire .232 in. (5,9 mm) 3-wire .244 in. (6,2 mm) Length ACCESSORIES Capacitive Well 925CPWL-30 2M (use with unshielded sensors only) Honeywell 1 MICRO SWITCH Sensing and Control 1 1-800-537-6945 USA 1 F1-815-235-6847 International 1 1-800-737-3360 Canada B77 Proximity Sensors Capacitive Preleaded Sensors 3-Wire DC, 2-Wire AC 972/973CP Series SPECIFICATIONS 972CP Series 973CP Series Sensor Type 3-wire DC 2-wire AC (SCR output) Supply Voltage 10-48 VDC 90-250 VAC Load Current, min./max. 200 mA 40-300 mA* Leakage Current, max. — 6 mA Voltage Drop, max. 1.5 V 8V Current Consumption, max. 10 mA — Inrush Current — 1.2 A/20 msec Repeatability 5% 5% Hysteresis 15% 15% *Do not interface directly with PLC. WIRING 2-WIRE AC SENSORS WITH CASE GROUND Wiring sensor w/o load will cause permanent damage. The third wire is the case ground. It should be connected as earth ground. WIRING 3-WIRE DC SENSORS NPN (Sinking) N.O. MOUNTING DIMENSIONS PNP (Sourcing) N.O. Capacitive Well Threaded 30mm (only) Do not place connecting cables of DC sensors in conduit with AC control wiring. Place in separate conduit or with wiring to other low voltage low current solid state devices. Isolation FDA approved polypropylene B78 Honeywell 1 MICRO SWITCH Sensing and Control 1 1-800-537-6945 USA 1 F1-815-235-6847 International 1 1-800-737-3360 Canada