Sames PPH 607 - Operating Principle; Turbine Rotation Speed; Microphone

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Revised A 24 6301

3.3. Operating principle

3.3.1. Turbine rotation speed

The reading is obtained using a microphone. The air supply arrives at the clip holding the bellcup.

This clip is machined with a groove in which air passes with every rotation of the bellcup. This pres-

sure variation causes a noise or “frequency signal”, which is sent through the injector holder to a

microphone. The microphone in turn converts this frequency signal into electrical variations which are

sent to the speed regulation board.

3.3.2. Microphone

1 Half moon groove

2 Microphone air return (Mic. OUT)

3 Microphone air supply (Mic. IN)

4 Microphone

5 Speed regulator board

6 Manual air regulator

7 1/4” Tube = (15 to 26 ft) or (4.5 to 8m)

8 Microphone air return1/4” tube

9 Microphone assembly (w/connector)

P/N: 851488 (6mm)

P/N: 459881(1/4”)

10 Microphone sleeve

PN: 546994

11 Microphone cable assembly

PN: 63-1080-00 (40m w/connector)

DES01241

For extra hose length,

increase microphone IN pressure 0.6 psi/feet of tubing

1/4” tube

26 feet / 8m

Maximum length

15 feet / 4.5m

Required minimum length

Microphone IN

Required pressure

25 - 45 PSI

DES01295

S01486

Mic Return air (Mic OUT)

To speed control board