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ELSTER RABO
RABO
Rotary Gas Meter
Rotary Gas Meter
®
®
RABO
RABO
Rotary Gas Meter
Rotary Gas Meter
®
®
Table of Contents
Table of Contents
1. General Information
2. Intended Use and Application
3. Operating Principle
4. Receiving, Handling and Storage
5. Installation
6. Start-up/Commissioning
7. Decommissioning and Removal
8. Inspection and Maintenance
9. Testing
10. Technical Data
11. Index
12. Pulser
13. Thermowell
As the left impeller rotates
As the left impeller rotates
toward the vertical position,
toward the vertical position,
gas enters the cavity created
gas enters the cavity created
between the impeller
between the impeller
and the housing.
and the housing.
Figure 1. Operating Principle
Figure 1. Operating Principle
02 Elster Instromet
03 Honeywell
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When the left impeller
When the left impeller
reaches the vertical
reaches the vertical
position, a finite volume
position, a finite volume
of gas is captured in the
of gas is captured in the
left cavity.
left cavity.
1. General Information
1. General Information
This manual covers the installation, operation and maintenance
This manual covers the installation, operation and maintenance
for the Elster Instromet RABO Rotary Meter. Refer to EAM-TB5900
for the Elster Instromet RABO Rotary Meter. Refer to EAM-TB5900
for additional information.
for additional information.
2. Intended Use and Application
2. Intended Use and Application
Elster RABO meters are suitable for measuring most types of
Elster RABO meters are suitable for measuring most types of
clean, dry, non-corrosive common gases. They are NOT intended
clean, dry, non-corrosive common gases. They are NOT intended
for use on biogas, sewage gas, oxygen, acetylene or liquids of
for use on biogas, sewage gas, oxygen, acetylene or liquids of
any kind. Product life and measurement accuracy can be affected
any kind. Product life and measurement accuracy can be affected
by contamination in the gas stream. Periodic servicing will prolong
by contamination in the gas stream. Periodic servicing will prolong
the life and performance of the meter.
the life and performance of the meter.
3. Operating Principle
3. Operating Principle
The RABO meter utilizes positive displacement principle of
The RABO meter utilizes positive displacement principle of
operation which makes volumetric measurements by displacing
operation which makes volumetric measurements by displacing
finite volumes of gas. The positive displacement occurs within
finite volumes of gas. The positive displacement occurs within
a cavity formed between the meter's internal housing and its
a cavity formed between the meter's internal housing and its
rotating impellers. The counter-rotating "figure-8" impellers [Figure
rotating impellers. The counter-rotating "figure-8" impellers [Figure
1] turn as a result of pressure drop across the meter's inlet and
1] turn as a result of pressure drop across the meter's inlet and
outlet created as downstream gas is consumed. The rotating
outlet created as downstream gas is consumed. The rotating
impellers separate the flowing gas into small, finite volumes
impellers separate the flowing gas into small, finite volumes
and are counted using a mechanical index. The RABO meter
and are counted using a mechanical index. The RABO meter
has no wearing parts because precision clearances between
has no wearing parts because precision clearances between
the impellers and meter body are maintained by timing gears,
the impellers and meter body are maintained by timing gears,
which are designed to enhance long term accuracy. Combining
which are designed to enhance long term accuracy. Combining
adequate filtration and periodic maintenance, a RABO meter will
adequate filtration and periodic maintenance, a RABO meter will
remain accurate over many years.
remain accurate over many years.
As the impellers continue
As the impellers continue
to turn, the volume of gas in
to turn, the volume of gas in
the left cavity is discharged.
the left cavity is discharged.
Simultaneously, gas is
Simultaneously, gas is
entering the space between
entering the space between
the right impeller and
the right impeller and
housing.
housing.
After further rotation, the
After further rotation, the
right impeller becomes
right impeller becomes
vertical and a finite volume
vertical and a finite volume
of gas is captured in the
of gas is captured in the
right cavity.
right cavity.
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