New CA Carlo Gavazzi Proximity Sensors

Carlo Gavazzi New Capacitive Sensors ~ Sords Electric

June 2014 – CARLO GAVAZZI is proud to announce the launch of their new Multi-voltage CA30CLN12M Series Capacitive Sensor with Relay and Optional Time Delay Output. These sensors provide reliable detection of solid, fluid or granulated substances and are equipped with a two amp SPDT relay output, with a time delay of up to ten minutes. This self-contained solution assures a robust output and sensing flexibility.

The CA30CLN12M Series is constructed in a threaded M30 housing, for simplified mounting ease. The back of the sensor features up to two IP67 integrated adjustment potentiometers for adjusting the sensing distance and an optional potentiometer for the time delay. The adjustable time delays available include: On-Delay or Off-Delay.

This sensor series is specifically designed for feeding systems and silo applications in the agricultural market, but can be used in most industrial applications. 

Technical specifications include

	Multi voltage power supply 21 to 255 VAC/DC
	2 A SPDT relay output
	M30 PBT housing with cable connection
	Up to two integrated IP67 rated trimmer potentiometers
	Multi-turn potentiometer for distance: 4-12 mm
	Optional multi-turn potentiometer for time delay: 1 second to 10 minutes
	Laser printing of the main specifications on the sensor
	IP67 ratings and NEMA 1, 2, 4, 4X, 5, 6, 6P and 12
	cULus approval as well as CE marking

With the release of this new multi-voltage capacitive sensor, CARLO GAVAZZI has also improved our popular VC11/12 Series. It carries the same 21-255VAC/DC supply voltage, and as you can see on the far right, it now a strain relief and the potentiometers are no longer hidden behind protective screws, as the new trimmer potentiometers are IP67 rated:

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800-929-2845

Proximity Sensor and Switches

A proximity sensor is a sensor able to detect the presence of nearby objects without any physical contact. A proximity sensor often emits an electromagneticor electrostatic field, or a beam of electromagnetic radiation (infrared, for instance), and looks for changes in the field or return signal. The object being sensed is often referred to as the proximity sensor's target. Different proximity sensor targets demand different sensors. For example, a capacitive or photoelectric sensormight be suitable for a plastic target; an inductive proximity sensor requires a metal target.

Proximity sensors can have a high reliability and long functional life because of the absence of mechanical parts and lack of physical contact between sensor and the sensed object.

Inductance is the property in an electrical circuit where a change in the electric current through that circuit induces an electromotive force (EMF) that opposes the change in current (See Induced EMF).

In electrical circuits, any electric current, i, produces a magnetic field and hence generates a totalmagnetic flux, Φ, acting on the circuit. This magnetic flux, due to Lenz's law, tends to act to oppose changes in the flux by generating a voltage (a back EMF) in the circuit that counters or tends to reduce the rate of change in the current. The ratio of the magnetic flux to the current is called the self-inductance, which is usually simply referred to as the inductance of the circuit. To add inductance to a circuit,electronic components called inductors are used, which consist of coils of wire to concentrate the magnetic field.

A capacitor or condenser is a passive electronic component consisting of a pair of conductors separated by adielectric (insulator). When a potential difference (voltage) exists across the conductors, an electric field is present in the dielectric. This field stores energy and produces a mechanical force between the conductors. The effect is greatest when there is a narrow separation between large areas of conductor, hence capacitor conductors are often called plates.

An ideal capacitor is characterized by a single constant value, capacitance, which is measured in farads. This is the ratio of the electric charge on each conductor to the potential difference between them. In practice, the dielectric between the plates passes a small amount of leakage current. The conductors and leads introduce anequivalent series resistance and the dielectric has an electric field strength limit resulting in a breakdown voltage.

Inductive switches can be used for counting of metal objects and detection of metal objects with any contact.

Capacitive Switches can be used for level control of water, plastics, foam products or food products.

Both Inductive and Capacitive switches can be made with NAMUR outputs so that the switches can be put in hazardous areas. The connections do need to go through a intrinsic safety barrier.

Most proximity switches are barrel shaped in the 5mm, 12mm, 18, and 30mm diameters. Also very common is the limit style proximity switch. Barrel materials are crastin, plastic, stainless steel, and nickel plated brass.

www.sordselectric.com

Sords Electric sells Carlo Gavzzi, ATC, Autonics, EMX and Pepperl and Fuchs proximity switches.