PicoTURN Overview

PICOTURN - Rotational Speed Sensing

PICOTURN - Turbocharger Speed Sensor

Industry Leader & World Supplier of Picoturn Systems

PicoTurn systems are used to measure turbocharger rotational speed with high accuracy. PMT has been the Sales and Technical support channel for PicoTurn products for almost 20 years. We are the ONLY TECHNOLOGY CENTER with the ability to calibrate turbocharger speed sensors.

Picoturn is a test system for measuring turbocharger rotational speed using the eddy current reduction technique. This technique directly senses each vane of the turbocharger wheel with a speed sensor that is mounted in a hole bored into the turbocharger housing. PicoTurn measures rotational speeds to 400,000 rpm, requires no modification of rotating parts, and senses the compressor wheel directly. It is compatible with single and two-stage turbocharger systems.

PicoTurn offers IP67 compliant sensors, standard digital TTL and CMOS output signals, compact housing, and a programmable number of vanes. The system has open architecture and works well stand alone or fits easily into another measurement system. PicoTurn is ideal for engine testing in passenger cars and commercial vehicles, as well as other applications that require high precision rotational measurement.

Speed Sensor Technology Features

The PICOSTRAIN integrated circuits are realized without any analog component. Again, acam uses its TDC technology to set new standards in circuit design and takes the advantages of this principle like:

  • Measuring principle: Attenuation by eddy currents
  • Sensing directly the compressor wheel
  • Fully integrated sensor electronics
  • Self-adjustment simplifies mounting
  • Comfortable spacing sensor-wheel
  • Suitable even for small compressor wheels (32mm)
  • No modification of rotating parts
  • Rotational speeds up to 400.000 rpm
  • Optional signal conditioning with PT2G-BX, PT2G-BD
  • Analog output (0.5 - 4.5 V)
  • Digital output (TTL, 50% duty cycle)
  • Number of vanes programmable (1-31)
  • Compact housing (105 x 30 x 85mm³)

Applications

  • Turbocharger speed sensing and measurement
  • Engine test cells
  • Test car instrumentation
  • Gear speed
  • Vane speed for various wheels and materials

DescriptionVersionSizeDownload
Datasheet PICOTURN-BM:
PICOTURN rotational speed sensor for turbochargers
586kBDB_PicoTurnBM_e.pdf
Datasheet PICOTURN-CT:
Calibration device for PICOTURN-BM
173kBDB_PicoTurnCT_e.pdf
Datasheet PICOTURN-2G:
Smart sensor for turbochargers
V1.5652kBDB_PT2G_e.pdf
DescriptionVersionSizeDownload
Application Note 094:
Using PuTTY.EXE as a Port Monitor for the PICOTURN-2G System
V1.1800kAN094_e.pdf
DescriptionVersionSizeDownload
PDN PICOTURN-DY:
Discontinuation of Production
V160KPDN0910-01.pdf
PICOTURN Measuring Principle

Rotational Speed Sensor for Turbochargers

The sensor is made of a simple coil with a ferrite core. Together with a resistor this forms an R-L network, the time constant of which is measured by a TDC. Placing a vane of the compressor wheel in front of the coil will change the time constant of the R-L network by the appearance of eddy currents. A DSP-unit following the TDC measurement unit processes the time data and calculates the rotational speed.

The time measurement is done with very high precision. The resolution is about 125 ps. The time constant of the R-L network can be very small, allowing high sampling rates in the range of 1 to 3 million samples per second.

The effect of eddy current damping is best for paramagnetic materials. This method therefore is very good for detecting aluminum wheels.

The maximum distance of the sensor from the wheel depends on the shape of the vanes. It varies from 0.8 mm (32 mm wheels) to 1.6 mm than 1 mm (90 mm wheels). Thanks to the ratio measurement any trimming of the coils is not necessary. The length of the cable between sensor and circuit may be up to several meters. This allows to separate the electronics part from the sensing part, reducing thermal and vibrational influences on the electronics.

The special kind of measurement reduces the influence of changes in the dielectric constant (e.g. by dirt) to a minimum.

Videos

PicoTurn

Acam's Picoturn by PMT

PICOTURN Ordering Numbers

PT2G (Second Generation)

Product

Description

Part No.

Sensors

PT2G-SM5.3

Intelligent sensor with integrated signal processing and TTL output, sensor length 60 mm / 54 mm thread, 230°C

MNR 1537

PT2G-SM5.5

Intelligent sensor with integrated signal processing and TTL output, sensor length 46 / 40 mm tread, 230°C

MNR 1591

PT2G-SM5.6

Intelligent sensor with integrated signal processing and TTL output, sensor lenght 75 / 69 mm tread, 230°C

MNR 1660

PT2G-SM5F.2

Intelligent sensor with integrated signal processing and TTL output, sensor lenght 75 / 69 mm fine read, 230°C

MNR 1590

PT2G-SM5F.3

Intelligent sensor with integrated signal processing and TTL output, sensor length 56 / 40 mm fine thread, 230°C

MNR 1538

PT2G-SM5F.5

Intelligent sensor with integrated signal processing and TTL output, sensor length 76 / 60 mm fine thread, 230°C

MNR 1666

Accessories

PT2G-BX

Signal conditioning box with RS232 interface

MNR 1526

PT2G-BD

Signal conditioning box with display

MNR 1527

PT2G-XS-01.5

Adapter cable, interconnecting PT2G-SM...sensor and PT2G-B...signal conditioning box, 1,5 m lenght

MNR 1771

PT2G-XS-03

Cable connecting sensor and signal conditioning box, 3 m length

MNR 1569

PT2G-XS-05

Cable connecting sensor and signal conditioning box, 5 m length

MNR 1539

PT2G-XS-10

Cable connecting sensor and signal conditioning box, 10 m length

MNR 1540

PT2G-C-2B

Power supply cable, 4 mm "banana" connectors, 2 m lenght

MNR 1541

PT2G-C-2U

Power supply cable , open end, 2 m length

MNR 1542

PT2G-C-2B&2BNC

Combination cable for power supply and signals(2 x BNC, 2 X "banana" 4 mm), lenght 3 m / 3.6 m 

MNR 1659

PT2G-X-CT

Cable, interconnecting PT2G-B...box and PICOTRUN-CT calibration device

MNR 1543

PT2G-CCT

Cable connecting PT2G-BD to PICOTURN-CT calibration device

MNR 1767

PT2G-C-CSM2M

Cable, connecting one PT2G sensor to a "CNTMM" counter minimodule by GSM GmbH, lenght 2m (also available in 10m)

MNR 1963

PT2G-C-ETAS_E441

Cable connecting two sensors PT2G to one "E441" module by ETAS GmbH, lenght: 2m

MNR 1984

PT2G-C-IPTRKLM

Cable. connecting one PT2G sensor to an IPETRONIK "SIM_CNT" or "-FRQ" counter module

MNR 1667

PICOTURN-BM/SM (First Generation)

Product

Description

Part No.

Controller Unit

PICOTURN-BM V6

Controller with BNC output connectors for 8 to 30 V power supply

MNR 1242

Sensors

PICOTURN-SM5.1

Sensor M5, L=60 mm, 1.5 m cable length, for temperatures up to 180°C

MNR 586

PICOTURN-SM5.2 (*)

Sensor M5 L=60 mm, with reduced head diameter (3.6 mm), 1.5 m cable length, 180°C

MNR 607

PICOTURN-SM5.3

Like SM5.1 but for high temperatures up to 230°C

MNR 933

PICOTURN-SM5.5 (*)

Sensor M5 L=46 mm, 1.5 m cable length, 230°C

MNR 998

PICOTURN-SM5.5L (*)

Sensor M5 L=46 mm, 2.0 m cable length, 230°C

MNR 1108

PICOTURN-SM5.6 (*)

Sensor M5 L=75 mm, 1.5 m cable length, 230°C

MNR 1059

PICOTURN-SM5.7 (*)

Sensort M5 L=45 mm, with reduced head diameter (3.6 mm), 1.5 m cable length, 180°C

MNR 1065

PICOTURN-SM5F.2

Sensor M5 fine thread for high temperature range up to 230°C,

L=41 mm, 1.5m cable length

MNR 934

PICOTURN-SM5F.3 (*)

Sensor M5 fine thread for high temperatures up to 230°C, L=56 mm,

1.5 m cable length

MNR 1081

PICOTURN-SM5F.3L (*)

Sensor M5 fine thread for high temperatures up to 230°C, L=56 mm,

2.0 m cable length

MNR 1109

Accessories

PICOTURN-CT

Calibration Device for PICOTURN-BM controllers

MNR 890

Extension cable

1.5 m SMB-SMB, for sensors

MNR 594

Extension cable (**)

2.5 m SMB-SMB, for sensors

MNR 707

Clamping nut

for M5 fine thread sensors -SM5F.x

MNR 696

PICOTURN-SM5.1, -SM5.3
(Click To Enlarge)
PICOTURN-SM5.7
(Click To Enlarge)
PICOTURN-SM5.2
(Click To Enlarge)
PICOSTRAIN-SM5F.2
(Click To Enlarge)
PICOTURN-SM5.5
(Click To Enlarge)
PICOTURN-SM5F.3
(Click To Enlarge)
PICOTURN-SM5.6
(Click To Enlarge)

ADDITIONAL INFORMATION