Napier EJ3815 turbocharger speed probe, Jaquet DSH 1840.01 PHV

Napier EJ3815 – turbocharger speed probe (HF speed sensor)

Napier approved speed measuring device for the air-cooled axial turbochargers, 7 and 8 series: inductive HF sensor with built-in amplifier, Jaquet type DSH 1840. The sensor detects the passing aluminium or titanium compressor vanes and gives a square-wave output signal. The air gap does not influence the calibration.

New, in stock.

EJ3815 has a metal Lemo connector. EX3816 is the same probe with a Bendix (Amphenol) connector.

• Napier part no.: EJ3815
• Sensor: Jaquet DSH1840.01 PHV (marking on the unit), inductive HF sensor with amplifier
• Manufacturer of the sensor: Jaquet, CE marked
• Power supply: 10-30 V DC, max ripple 25 mVpp, max 100 mA
• Current consumption: 12 mA at 12 V DC without load
• Output: square wave, push-pull, max load 25 mA (source or sink), short-circuit protected up to 25 mA
• Frequency range: 0.1 Hz – 20 kHz
• Air gap: 0.2 – 4.0 mm (aluminium blade)
• Temperature: sensor body -30 to +125 °C, cable rated 200 °C
• Housing: aluminium alloy, black anodised, M18 x 1.5, length 50 mm
• Cable: PTFE 3-core 3 x 0.22 mm² (AWG24), shielded, 2 m
• Protection: IP67
• Connector: Lemo, metal
• Lemo wiring (looking towards the sensor head, pre-wired side, locating lug at top): output signal top left, supply 10-30 V top right, ground (cable shield) bottom left, 0 V bottom right
• Screening: terminate the cable screen at the instrument panel via 0 V, not to power earth

Pulses per revolution (compressor wheel designation on the turbocharger nameplate)

• G: 9 pulses – Napier 297, 357, 458 and 558
• GS: 13 pulses – Napier 297, 357, 458 and 558
• H: 13 pulses – Napier 298
• J: 11 pulses – Napier 397, 307