1 Index / contents
1.0
General
Page
1.1
Overview
2
1.2 Operating principal
2
1.3
Model number information
3
1.4
Specifications
4
2.0 Installation
2.1
Mechanical installation
5
2.1.1
Orientation
5
2.1.2
Flow conditioning & locations
6
2.2
Electrical installation
6
2.2.1
Instrument cable
6
2.2.2
Hazardous area wiring
7
2.3
Pulse output selection for pulse meters
7
2.3.1
Hall sensor pulse output
7
2.3.2
Reed switch pulse output
7
2.3.3
Quadrature pulse output
8
2.3.4
Signal integrity verification
8
2.3.5
Bi-directional flow
8
2.4
Meters fitted with integral instruments
9
2.4.1
Meter calibration factor
(K-factor or scale Factor)
9
3.0 Commissioning
10
4.0
Maintenance
10
4.1
Disassembly of pulse meter
11
4.2
Disassembly of meters fitted with an instrument
11
4.3
Exploded view & spare parts
11 &
12
4.4
Inspection & exploded view
13
4.5
Re-assembly of meter
13
5.0 Fault Finding
14
5.1
Trouble shooting
15
General 2
General
1.1 Overview
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 water based products and chemicals and aluminum meters are
suitable for fuels, fuel oils & lubricating liquids.
The flowmeter is available as a blind meter with pulse output capable of interfacing to most monitoring and control
instrumentation or the meter can be fitted with or supplied with instruments such as totalisers, rate totalisers or
batch controllers.These instruments also have monitoring and control output options including 4-20mA, scaled
pulse, flowrate alarms and batch control logic
(preset metering
).
If your flowmeter is fitted or supplied with an instrument please also refer to the relevant instrument instruction
manual.
These flowmeters can be installed within hazardous areas by using the reed switch pulse output in Intrinsically
Safe loops or fitting Intrinsically Safe certified Instruments. Please consult the factory for the availability of
flameproof models.
1.2 Operating Principle
The Oval gear are positive displacement flowmeters where the passage of liquid causes two oval geared rotors to
rotate within a precision measuring chamber and with each rotation a fixed volume of liquid is displaced passing
through the meter. Magnets embedded within the rotors initiate a high resolution pulse train output. The pulse
output can be wired directly to process control and monitoring equipment or can be used as an input to
instruments supplied with or fitted directly to the meter.
The benefits of this technology allow precise flow measurement and dispensing of most clean liquids irrespective
of their conductivity, with other liquid characteristics having nil or minimal effect on meter performance. This
metering technology does not require flow profile conditioning as required with alternative flow technologies
making the installation relatively compact and low cost.
OPERATION :
Liquid travels around the crescent
shaped chambers created by the
rotational movement of the rotors
liquid exits the
measuring chamber
liquid in transit
flow
liquid entering
measuring chamber