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 1.5
GENERAL
The turbine type flow transducer is a volumetric fluid flow measuring instrument. It uses as its flow sensitive
element a Freely suspended bladed rotor, positioned axially in line with the flowing fluid, so that it rotates in precise
proportion to the volume of fluid passing through the transducer. An "active" type pick-off is placed in close proximity to
the turning rotor. A high frequency signal from an oscillator-amplifier is fed into the pick-off coil and the spinning rotor
modulates the signal as each blade of the rotor passes the coil. The signal is then de-modulated, amplified, and shaped
to a 10 volt positive pulse. The frequency of these pulses represents the volumetric flow rate and the accumulated pulse
represents the total volume of fluid measured.
The flowmeter consists of four (4) basic parts (See Figure 4):
1. Housing
2. Rotor Assembly
3. Support Assembly
4. Pick-off and Lock Nut Assembly
FIGURE 4. GENERAL CONFIGURATION FLOWMETER.
1-22
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