Altech offers a comprehensive line of Inductive Proximity Sensors to satisfy today s diverse sensor applications. Used for a wide range of functions in industrial plants and machinery, typical sensor applications include; material handling systems, machine tools, packaging machines, assembly machines and production lines, robotic systems, etc.
Altech / Pulsotronic Inductive Proximity Sensors are available for DC (PNP and NPN), AC and AC/DC voltages with normally open and normally closed output contacts, in flush and non-flush mounting configurations. They are available in Cylindrical, Limit, Block and Ring styles.
Pulsotronic Proximity Sensors:
The Inductive Proximity Sensor (IPS) is a solid state device that generates an output signal when metal objects are either inside or entering into its sensing area from any direction. No physical contact is required nor desired. IPS's work best with ferrous metals, however, they also work well with non-ferrous metals (aluminum, brass, copper, etc.) at reduced sensing distances, see Figure 1.
First introduced in the mid 60’s, Inductive Proximity Sensors were designed as an alternative to mechanical limit switches for many applications. Initially, IPS's were made with housing similar in size and dimension to the limit switch, but had short sensing distances. Following very good results with these new devices, market pressure led to the development of larger sensors with increased sensing distances.
Inductive Proximity Sensors have no moving parts, operate very fast, are extremely reliable, require no maintenance, and operate under extreme environmental conditions. They typically interface with Programmable Logic Controllers (PLC), process, and personal computers with appropriate hardware and software. They also can control relays, solenoids, valves, etc., up to their maximum output current.
Altech Inductive Proximity Sensors are manufactured by Pulsotronic in Germany. Pulsotronic, a well known European manufacturer, has been designing and manufacturing IPS's for over 30 years using state-of-theart technology and is an 1S0 9001 certified company. Altech is Pulsotronic's North American marketing partner. Our Inductive Proximity Sensors meet National and International Standards and carry the CE Mark.
Altech offers 4 Inductive Proximity Sensor families. Cylindrical Inductive Proximity Sensors represent the most popular device, and are available in diameters from 4mm (.159 in.) to 30mm (1.18in.) and sensing distances up to 40mm (1.57in.). Typically, Cylindrical models have low sensing distances and are used in applications requiring compact sizes that are easily mountable. Please refer to selection guide on pages 12-14 for more information.
Limit style (Versa-Prox) Inductive Proximity Sensors are physically larger than Cylindrical IPS's and have sensing distances up to 40mm(1.59in.). These units feature a unique 17 position rotating sensing head with snap and lock construction (no screws). Versa-Prox IPS's are used to replace mechanical limit switches and for applications where adjustment of the sending head is desired.
Block Inductive Proximity Sensors feature models with adjustable sensing distances up to 70mm (2.78in.). The largest Block is 100 x 50 x 40 mm (3.9 x 2 x 1.6 in.). Block sensors are used for applications where maximum sensing distances are required.
Ring Inductive Proximity Sensors are special devices that detect metal objects passing through the ring. Altech offers a wide range of ring diameters from 12mm (.47in.) to 300mm (11.91 in.). Our Ring IPS's are available in normal and high sensitivity models. Typical application are in stamping operations and detection for unwanted metals.
Altech/Pulsotronic Inductive Proximity Sensors, (except Ring & Flat-pack), offer a lifetime warranty subject to completing the registration form.
An Inductive Proximity Sensor consists of an oscillator, a ferrite core with coil, a detector circuit, an output circuit, housing, and a cable or
DC Inductive Proximity Sensors may be 2-wire, 3-wire or 4-wire. A 3 -wire or 4-wire DC sensor can be an NPN or PNP output transistor. If the output load is connected to the negative power source then a sensor with a PNP output transistor is required. A PNP sensor is also known as a source sensor. If the output load is connected to the positive power source, then a sensor with an NPN output transistor is required. An NPN sensor is also known as a sink sensor. Please see Figure 3 for PNP and NPN electronic output circuits. AC Inductive Proximity Sensors are 2-wire devices, except when using a sensor with a metal housing where a third wire is available for connection to system ground.
FLUSH MOUNT AND NON-FLUSH MOUNT
The resulting electromagnetic field is directed in front of the sensor face. Flush sensors have a narrow sensing field which may be desirable in certain applications. In a Non-Flush (Non-shielded or Non-embeddable) sensor, (Figure 4), there is no metal band and the resulting electromagnetic field lines are much wider than the sensor face. Non-Flush sensors have a larger sensing distance than Flush sensors.
SENSORS IN SERIES AND PARALLEL
PROTECTION (Sensor Housing)
All Inductive sensors meet the following shock and vibration requirements: 30g’s/11ms, and 10-55 Hz/mm.
A standard target used to specify sensing distance is a square piece of mild steel having a thickness of 1mm (0.04 in.). The sides of the square are equal to the diameter of the circle inscribed on the sensor face or three times the rated operating distance Sn, whichever is greater.
The assured operation distance (Sa) is the smallest useful sensing distance which guarantees operation under variations in temperature, voltage and manufacture. It is given as 81% of Sn. See Figure 5. 0<Sa<.81 Sn.
The effective sensing distance (Sr), is measured at nominal supply voltage and nominal ambient temperature and takes into account manufacturing tolerances:
The usable sensing distance, (Su), takes into account temperature, voltage variations and manufacturing tolerances:
Hysteresis is the switch-on point when the object approaches the sensor's active surface, and switchoff point, when the object is moving away from the sensor's active surface. Without sufficient Hysteresis, an Inductive Proximity Sensor would chatter (continuously switching on and off), so it is designed into the sensor circuitry. The differential travel (Hysteresis) is given as a percent of the expected rated operating distance Sr. (See Figure 6).
MAXIMUM SWITCHING FREQUENCY
The switching frequency indicates the maximum number of switching operations of a sensor per second. The value listed in the product specifications is achieved with the conditions shown in Figure 7. The value is always dependent on target size, distance from sensing face and speed of target. Using a smaller target or space may result in a reduction of a specific sensor maximum switching frequency.
Altech offers a full range of accessory products including quick disconnect cable assemblies, mounting clamps and brackets, liquid tight strain reliefs, amplifiers, switching units, etc. Please refer to each product specification and the accessory chapter starting on page 113.
The CE Mark is a compliance symbol, which means that the product meets the standards set by the European Committee for Electrotechnical Standardization (CENELEC), and the International Electrotechnical Commission (IEC). Products containing the CE mark are allowed to have free movement within the European Union (EU), and European Economic Area (EEA). Products manufactured in the USA that are exported to the EU and EEA should have the CE marking and utilize components also having the CE marking.
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