Capacitive NO/NC Selectable AC/DC Sensors
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Capacitive NO/NC Selectable AC/DC Sensors FEATURES • • • • • • • • • • • DESCRIPTION Capacitive sensors are used to detect metallic and non-metallic objects (liquid, plastic, wooden materials and so on). These capacitive sensors have a normally open or normally closed output selector switch and operate on a wide voltage range, 20 - 250 V AC/DC. This greatly reduces the need to keep multiple sensors in stock. Their housing consists of a cylindrical threaded metal or plastic 30 mm diameter case. They are dust and water tight as well as shock and vibration resistant. All models feature LED indication of the output status and short circuit protection up to 50V in DC. A screw placed on the sensor allows regulation of the operating distance. This sensitivity regulation is useful in applications, such as detection of full containers and non-detection of empty containers. A waterproof protective housing is available. This housing is made of a non-toxic material (POM) and has a standard 1 1/2" GAS threaded fitting for mounting into a container. This housing permits a sensor to be rapidly removed for testing without the loss of material and protects the sensor from abrasion. The use of the housing can help to eliminate variation in the sensitivity of the sensor due to deposits of material. OPERATING PRINCIPLE Capacitive proximity sensors use the variation of the parasitic capacity that develops between the sensor and the object being detected. When the object is at a preset distance from the sen-sitive side of the sensor, an electronic circuit inside the sensor begins to oscillate. The rise or fall of such oscillation is identified by a threshold circuit that drives an amplifier for the operation of an external load. AC/DC Capacitive NO/NC output selector switch AC/DC power supply Sensing of metallic and non-metallic objects Adjustable operating distance Cylindrical threaded metal or plastic casing Short circuit protection up to 50V in DC LED indication of the output logic status Cable and connector versions Protective housing available for mounting into containers Compliant to the EMC directive RoHS Compliant The operating distance of the sensor depends on the actuator shape and size and is strictly linked to the nature of the material (Table 1.). Capacitive sensors Metal ~ 1 x Sn Water ~ 1 x Sn Plastic ~ 0.5 x Sn Glass ~ 0.5 x Sn Wood ~ 0.4 x Sn Table 1. Sensitivity with different materials. Sn = operating distance. 2 wire AC/DC NO/NC select advantages: • Reduces stock • Easier installation • Not polarity sensitive • Compatible with PLC units • Separate power supply not required 2 wire AC/DC considerations: • The min. current required for the load (Example: Switching of a relay) is ≥ the min. switching current of the sensor. • The leakage current is not sufficient to cause activation of high impedance inputs and is low enough to release low consumption relays. • Attention is given to the “on state” voltage drop when there is a low supply voltage. MODEL Output NO/NC select S5140 S5141 S5170 S5171 Function Operating Distance mm 0 - 20 0 – 25 External Diameter M30 x 1.5 Power Supply 20 - 250 V ac/dc Max. Switching Current 500 mA Min. Switching Current 10 mA Leakage Current ≤ 2 mA Voltage Drop (On State) <6 Short Circuit Protection Yes ( Up to 50V in dc) Operating Frequency(max) 10 Hz Case Nickel Plated Brass Plastic Dimensions Fig. 5 (cable) Fig. 6 (connector) Fig. 7 (cable) Fig. 8 (connector) Flush Mounting Yes No Protection Degree IP 65 Operating Temperature -20 to +70° C Output Connection Cable PVC 3x0.50mm² Connector Type C2 * Cable PVC 3x0.50mm² Connector Type C2 * Protective housing Model # — — S5911 S5912 * Mating connector with screw terminals included www.fargocontrols.com 732 389-3376 Fax 732 542-3553 1

DIMENSIONS: mm, 1 mm = .03937", 1" = 25.4 mm Fig. 5 Fig. 6* Fig. 8* Fig. 7 * mating C2 connector included WIRING: CONNECTOR: (included with sensor) Female C2 connector with internal terminal screws ACCESSORIES: Protective housing: S5911 for sensors with cable SELECTOR (NO/NC) Before giving power to the sensor, program the sensor using the selector switch to the required function of NO (normally open) or NC (normally closed) S5912 for sensors with connectors SENSITIVITY ADJUSTMENT Remove plastic protection screw. Adjust internal trimmer. It is recommended that adjustments are carried out...