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PO2211 Single channel differential inductive position sensor

Features

PO2211 Microcoil induction sensor (click on image to enlarge)

  • Differential sensor configuration
  • Robust in oil, water, dust, magnetic fields
  • No magnet required
  • Target in any metallic material (steel, alu, copper)
  • Ultra-thin package, 1.8 mm thick
  • 0 to 1 mm distance between sensor and target
  • -40°C to +125°C operating temperature range
  • 0 to 10 kHz frequency range
  • Supply 5V / 15 mA
  • Distance between detection coils: 1 mm

Applications

  • Gear tooth sensing
  • Speed sensing
  • Cam- and crankshaft

Description

The PO2211 is a differential microcoil inductive sensor to measure the speed or position of a gear, a slotted disk or a metal strip with openings. Because the sensor employs a high-frequency magnetic field and employs a differential configuration, the sensor

  • is insensitive to magnetic fields
  • senses any metallic (electrically conducting) or ferromagnetic material.

Working mechanism

Block diagram PO2211 (click on image to enlarge)

The generator micro-coil creates a AC magnetic field with a frequency around 1 MHz. The magnetic field couples into the two detection coils that are separated by a distance of 1 mm and that are connected in a differential configuration. When a ferromagnetic (steel) or electrically conducting (aluminum, brass, copper etc) object in front of the sensor deforms the AC magnetic field, a signal is measured at the outputs of the differential detection coils. The detection coil signal is amplified, demodulated, low-pass filtered and passed through a comparator. The comparator includes hysteresis in order to provide a stable switching point.

Output signals

The period of output signal A corresponds to the target period (center to center distance between two adjacent teeth). The duty cycle D = P/C depends on target dimensions, shape and material.

Targets and sensor mounting

Technical drawing PO2211 (click on image to enlarge)

The sensor can operate in combination with a wide range of linear or angular targets. Duty cycle and maximum working distance depend on the target dimensions, shape and material. Some examples for targets:
- Gear with module 0.4 – 1.0 with radial readout (see drawing below)
- Metal disk with stamped or etched openings with a periodicity of 1.5 – 3.5 mm with axial readout
- Metallic band with stamped or etched openings for linear applications
The sensor may be rotated around its sensitive axis in order to adapt to the target period or to optimize the maximum working distance.

Key specifications

Parameter

Symbol

Conditions

Min.

Typ.

Max.

Unit

Supply voltage

Vdd

Relative to GND

4.5

5.0

5.5

V

Supply current

Idd

Vdd = 5V, excluding output currents

10

-

20

mA

Output level, high

Voh

Vdd = 5V, Io = -1mA

Vdd-0.5

-

Vdd

V

Output level, low

Vol

Vdd = 5V, Io = 1mA

GND

-

0.5

V

Output current

Iout

-

-1

-

1

mA

Rotor distance

RD

PCB surface to OD of reference gear

1.0

1.5

2.0

mm

Count frequency

Fc

-3dB

-

-

10

kHz

Duty cycle

DC

-

-

50

-

%


Downloads

Product Brief
 Document PDF
 PO2211_PB_V1A.pdf
   191.47Ko

3D-drawing of sensor with flat cable (STEP)
 Document
 Posic_2201_Cable.STEP
   888.54Ko

3-D drawing in STEP-format
 Document
 PO2211.STEP
   1.03Mo

 
 
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