Description

• Non-contact sensing • Solid-state - no moving parts • Durable corrosion resistant metal housings • High speed repeatability • Short-circuit and reverse polarity protection • Outputs CMOS compatible • Full output signal down to zero Hz • LED operation indicator on all models Description Electro-Sensors’ Model 600 Series Proximity Switches are active digital sensing devices that generate one pulse per pass of an actuating target within their sensing field. No direct contact with target material is necessary. Each sensor is entirely solid state with no moving parts to wear out. This provides for long life with little or no maintenance. The wide range of supply voltages to the 600 Series permits them to be directly interfaced with low voltage solid state controls, such as programmable controllers and electromechanical relay loads. All sensors are polyurethane or epoxy encapsulated and are provided complete with mounting bracket, jam nuts, and 6 feet of cable. Principle of Operation The Model 600 Series Proximity Switches utilize an oscillator circuit to generate a high frequency field that is radiated from a coil in the tip of the sensor. When a metal object or “target” enters this high frequency field, eddy currents are induced into the target. A detection circuit immediately senses a loss of energy in the oscillator circuit. This low amplitude condition causes the solid state output from the sensor to switch. When the “target” material moves away from the sensing face of the switch, the oscillator regenerates and the switch returns to its normal state. Electro-Sensors’ products bring efficiency and safety to your operations by preventing machine damage, product waste, and costly downtime. The 600 Series offers two types of Proximity Switch Sensors: shielded and unshielded. For general purpose applications unshielded sensors are usually preferable to shielded because they have greater sensing range capabilities. Shielded sensors, however, have the distinct advantages of being capable of flush mounting directly into a metal surface. This permits minimum spacing between sensors, and conductive materials not directly in line with the sensor’s face will not affect operation. The switch should be mounted as close as possible to the target material for best performance. Care should be taken to mount the sensor firmly in such a position as to give the sensing face the best possible view of the target material, free from conductive obstructions. The target material likewise should present as much surface area as possible to the sensor face. It is recommended that proximity switches be mounted with a vertical sensing face or looking down when possible. Metal filings or chips will not normally affect proximity sensors, but careful placement of sensors provides the most accurate results possible. Typical Applications 600 Series Proximity Switches can be used in the following applications: • Detect conductive materials • Motion detection (keyways, bolt-heads, gears, etc.) • Parts detection and counting • Tool detection (broken or damaged) • Indexing control • Sequencing automated equipment • Interlocking machine process control • Drive motor stall detection • Input to programmable controllers