Picoturn PTCM

Compact Controller

Accurate Technologies Inc. (ATI) offers the PICOTURN PTCM rotational speed sensor for turbochargers. Compared to optical or magnetic sensing systems, the PICOTURN system is proven as a rugged, reliable, simple, accurate and cost effective solution. The system’s functional principle is a 1MHz pulse induction with eddy current discrimination, using a compressor mounted solenoid sensor that detects and counts compressor vanes individually, generating a standard TTL/CMOS output signal.

PTCM Compact Controller

  1. Power & Interface Cable Connector
  2. Code Switch for Number of Vanes
  3. Status LED
  4. Sensor Connector

The PICOTURN PTCM consists of a sensor with a 1.5m cable, a compact, ruggedised signal-conditioning box, plus a lead for output and power supply. Both the sensor and PTCM box are rated as IP67 proof if connected and installed as per PICOTURN’s recommendations, making it ideal for underbonnet fitments. The PTCM is capable of compressor wheel speed measurement up to 400,000 rpm with a minimum operating speed of 200 rpm.

The PICOTURN system benefits from high sensitivity, allowing a large distance between sensor and the rotating vanes in the range of 1 mm at 0.6mm vane thickness. Various sensors are available to accommodate numerous user cases differentiated by the length and thread of the sensor head. The PTSM-H series benefits from enhanced sensitivity, enabling use with titanium wheel and other critical applications where higher temperatures are a priority.

System Overview

System Overview PTCM

  1. Signal Conditioning box
  2. Sensor with cable
  3. System
Dimensions45mm x 50mm x 25mm (when sensor connected)
Protection Class IP67
Number of Vanes1 to 31
Digital OutputTTL/CMOS (One impulse per N vanes, N = 1 to 31)
Analog Output0.5 to 4.5V
Temperature-40°C to +85°C
Supply Voltage9 to 30 volts DC
* Excess temperature tolerated for short periods
Sensor Tip Element TemperatureStandard sensor–40°C to +250°C*
H-type sensor–40°C to +270°C*
Sensor Body DimensionsFine thread M5x0.5, with various lengths 25mm to 60mm
Standard thread M5x0.8, with various lengths 40 to 70mm
Protection Class IIP67
Part No.ProductDescription
220340001PTCM V1.0New reduced sized Controller/Signal Conditioning box with standard interface
220390001PTCM V1.0LNew reduced sized Controller/Signal Conditioning box with LEMO interface connector
H-types for higher temperature and higher sensitivity: -40°C to +280°C
Part No.ProductSensor length /
Thread length
DiameterCable length
220180003PTSM-H 5.3 60 mm / 54 mmM5 x 0.8 1.5m
220180004PTSM-H 5.546 mm / 40 mmM5 x 0.8 1.5m
220180005PTSM-H 5.6 75 mm / 69 mmM5 x 0.8 1.5m
220180006PTSM-H 5F.2 41 mm / 25 mmM5 x 0.5 1.5m
220180007PTSM-H 5F.3 56 mm / 40 mmM5 x 0.5 1.5m
220180008PTSM-H 5F.576 mm / 60 mmM5 x 0.5 1.5m
Standard Type: -40°C to +250°C
Part No.ProductSensor length /
Thread length
DiameterCable length
220150008PTSM 5.360 mm / 54 mmM5 x 0.8 1.5m
220150006PTSM 5.546 mm / 40 mmM5 x 0.8 1.5m
220150012PTSM 5.675 mm / 69 mmM5 x 0.8 1.5m
220150004PTSM 5F.241 mm / 25 mmM5 x 0.5 1.5m
220150014PTSM 5F.356 mm / 40 mmM5 x 0.5 1.5m
220150016PTSM 5F.576 mm / 60 mmM5 x 0.5 1.5m
Part No.ProductDescription
220320001PTCM-1.5-ncSystem interface power cable, open ends1.5 m length
220320002PTCM-3.0-ncSystem interface power cable, open ends3.0 m length
220320003PTCM-1.5-BNCSystem interface power cable, BNC connectors for signals, banana jack connectors for power1.5 m length
220330001PTCM Mounting PlateMounting plate including screws
220030002PTSM 5F.x Clamping nutFor fine thread sensors -SM5F.x
220130002PTBM/PTCM Lemo system cableLemo system cable, open ends2.0 m length
220360001PTCM coverfoilFaceplate
220370001PTCM coversealSeal for faceplate
220360001PTCM-L coverfoilFaceplate