5
1.
Introduction
The Oval gear meter is a precise positive displacement flowmeter incorporating a pair of
oval geared rotors. These meters are capable of measuring the flow of a broad range of
clean liquids.
Stainless Steel flowmeters are suited to most liquid products and chemicals; including
many water based liquids, acids, bases and salt solutions, and Aluminium meters are
suitable for fuels, oils & most non-aggressive lubricating liquids.
Oval Gear flowmeters are available as blind meters with a pulse signal output capable of
interfacing to most monitoring and control instrumentation, or the meter can be fitted with
instruments such as totalisers, rate totalisers or batch controllers. These instruments also
have monitoring and control output options including 4-20mA, scaled pulse, flow-rate
alarms and batch control logic
(preset metering
).
1.1
Operating Principle
Oval Gear flowmeters are positive displacement devices where the passage of liquid
causes two oval geared rotors to rotate within a precision measuring chamber. Each
rotation of the Oval rotors will transmit 4 identical volumes of liquid from the meter inlet to
outlet
(as shown in the diagram below)
; providing electronic pulses via magnetic sensors to
a digital instrument.
