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Model CPU    Universal AC/DC Capacitive Proximity Switch


Compact, Universal Voltage, Most Affordable!


A very affordable, compact level switch with universal AC/DC technology for clean liquids, powders and granular materials - low cost, low profile, high value.


  • 2-wire universal AC/DC switches
  • Shielded or unshielded designs for flush or invasive mounting
  • Solidstate design, no moving parts
  • Normally open or normally closed
  • Compact 30mm M30 size
  • LED indicates sensing condition
  • Prewired 2m long cable
  • Sensor mounting accessories available
  • You are covered – Golden Parachute Support



For More Information

Click here to download product line PDF’s.

  1. Model CPU Sales Flyer
  2. Model CPU Technical Information
  3. Model CPU Installation, Operation and Maintenance Instructions

Principal of Operation

Capacitive proximity switches consist of an RC-oscillator with a special multi-part sensing electrode.


When the target material is removed from within the active zone, the oscillator is undamped and the oscillation amplitude decreases.


The amplifier of the oscillator voltage and the sensitivity of the sensor can be altered by the built-in potentiometer.  This allows for a "calibration" for the proximity of the target to activation of the sensor.

Application and Use

Capacitive proximity switches can be either shielded or unshielded and can be used to detect high, low and intermediate levels in tanks and bins.


Shielded sensors can be embedded within a vessel wall so that the sensor face is flush with the inside wall of a vessel. Unshielded sensors detect from the face and from the circumference of the front part of the sensor and therefore cannot be embedded. Vessel contents or target materials to be sensed can be fluids, powders or granulated materials such as PVC powder, dyes, flour, sugar, powdered milk and many other clean and free-flowing materials.


Common applications also include use as end or limit switches for checking and regulating machinery settings. This includes even non-metallic targets such as in conveyor belt positioning and material stacking applications. Capacitive proximity switches can also be used as detectors for counting metallic and non-metallic components.

Technical Data Summary

Operating Voltage 20-250 VAC/VDC
Housing 30mm diameter x 80mm long; PBT plastic case; IP67
Process Temp

-13° F to +158° F

(-25° C to +70° C)

Ambient Temp

-13° F to +158° F

(-25° C to +70° C)

Sensing Distance Up to 20mm Distance; Adjustable setting
Wire Connection 2m Prewired Cable
Maximum Load 200mA
Process Connection 30mm Threaded; Optional Sensor Mounting Wells and Accessories Available
Certifications Ordinary Location; CE mark

Standard Models Available

  • 2-Wire AC/DC, N.O., Unshielded/Shielded, 2m Cable
  • 2-Wire AC/DC, N.C., Unshielded/Shielded, 2m Cable



Call To Order Now!


Ordering Information –

Sensor Final Assembly Part Number Structure

4 7 - X X X 1 - 1 X X

Output Configuration

1 - N.O.

2 - N.C.


1 - Unshielded

2 - Shielded

Supply Wiring

4 – AC/DC 2-wire


1 - Ordinary Locations

Process Connection

1 - 30mm

BlueLevel Technologies, Inc.   |   |   Phone: 330-523-5215   |   Fax: 330-523-5212

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