TCS900004, Rev.4
07/12/2016
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Page 4
Meter Overview
The TCS Model 700 series flow meter is a simple and
efficient design. The meter consists of a single fluid
chamber that contains a single blocking rotor and two
displacement rotors whose rotation is synchronized
with mating gears. As the fluid enters the fluid
chamber, the blocking rotor is forced to rotate. The
displacement rotors, also rotating in conjunction with
the blocking rotor help direct the fluid flow through
the chamber and to the outlet. The linear flow of the
fluid is thus translated into rotary motion in the meter.
The output of the meter is picked up from the rotation
of the blocking rotor and transmitted to a register or
pulse transmitter.
The rotors in the meter are designed to operate at close tolerances to one another and the
wall of the fluid chamber. There are slight clearances between the rotors and the chamber
wall. Because of this, it is important that the meter be properly applied for the flow rate
and operating pressure of the system.
Because the fluid flowing through the meter is redirected only slightly from its natural
flow, there is very little pressure drop across the meter, unlike other meters that use
multiple measuring chambers.
The meter design uses high performance materials for the rotor bearings and journals.
Since there is no contact between the rotors and the fluid chamber wall, these critical
components have a long life expectancy.
Calibration of the meter involves adjusting the rotation of the output shaft relative to the
rotation of the internal rotors of the meter. This is accomplished by changing the settings
on an adjuster device. Calibration of the meter is discussed in detail in the section Meter
Calibration.
FLOW ILLUSTRATION
