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Lead Contents

Proximity Sensors

Proximity Sensors are available in models using high-frequency oscillation to detect ferrous and non-ferrous metal objects and in capacitive models to detect non-metal objects. Models are available with environment resistance, heat resistance, resistance to chemicals, and resistance to water.

Related Contents

Primary Contents

Interpreting Engineering Data

Sensing AreaSensing Distance vs. Display CharacteristicsEffects of Sensing Object Size and Material
・ This graph shows engineering data from moving the sensing object parallel to the sensing surface of the Proximity Sensor.

・ Refer to this graph for Proximity Sensor applications,such as positioning. When a high degree of precision is required, use a Separate Amplifier Proximity Sensor.
・ This type of graph is used with Separate Amplifier Proximity Sensors. It shows the values when executing FP (Fine Positioning) at specified distances. FP settings are possible at any desired distance, with a digital value of 1,500 as a reference for the E2C-EDA.

・ The above graph shows numerical examples when Fine Positioning is executed at the three points of 0.3, 0.6, and 0.9 mm.
・ Here, the horizontal axis indicates the size of the sensing object, and the vertical axis indicates the Sensing Distance. It shows changes in the Sensing Distance due to the size and material of the sensing object. Refer to this data when using the same Sensor to detect various different sensing objects, or when confirming the allowable leeway for detection.
Leakage Current CharacteristicsResidual Voltage Characteristics
・ In contrast with contact-type limit switches,
which have physical contacts, leakage current in a 2-wire
Proximity Sensor is related to an electrical switch
that consists of transistors and other components.
This graph indicates the leakage current characteristics
caused by transistors in the output section of the Sensor.

・ Generally speaking, the higher the voltage,
the larger the leakage current. Because leakage current
flows to the load connected to the Proximity Sensor,
care must be taken to select a load that will not cause
the Sensor to operate from the leakage current.

・ Be careful of this factor when replacing
a limit switch, micro-switch, or other switch with a
Proximity Sensor.
・ Similar to leakage current characteristics,
residual voltage is something that occurs due to
electrical switches that are comprised of transistors
and other components. For example, whereas the
voltage in a normally open switch should be 0 V
in the ON state, and the same as the power supply
voltage in the OFF state, residual voltage refers to
a certain level of voltage remaining in the switch.
Be careful of this factor when replacing a limit switch,
micro-switch, or other switch with a Proximity Sensor.