Rich DewarProduct Line Manager

Itron

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THE DATTUS III METER / 2

2000’s1950’s1930’s1900’s

DATTUS III

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THE DATTUS III METER / 3

DRIVERS

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THE DATTUS III METER / 4

WHAT IS THE DATTUS METER?

DESCRIPTION

»Solid-state gas meter

»Fluidic oscillation technology

»Designed for distribution measurement

»Fits the standard footprints

»Designed for future value

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How Does it work?

Inlet

Flow Tranquilizer

Jet FormationNozzle

OscillationChamber

(1) (3)

(2)

Operating Principle The operation of the Dattus

meter is based on the fluidic oscillation principle. This static metering technology is based on Bernoulli’s theory—a slow moving high pressure gas becomes a fast moving low pressure gas.

Described in 3 elements> Flow Tranquilizer> Jet Formation Nozzle> Oscillation Chamber

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Flow Tranquilizer

Conditions the Inlet Flow Removes effects of inlet

piping configurations Produces a known profile

for the nozzle Accelerates the flow to

eliminate any dissymmetry in the initial separation

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Jet Formation Nozzle

Forms a distinct jet gas flow profile

Enhances separation in boundary layers to reduce frictional effects

Leveraged the ‘Coanda’ effect that the fluidic meter is based on

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Oscillation Chamber

An obstacle in the chamber is used to control the fluid feedback paths.

As the jet is ‘bent’ to one side of the cavity a pressure node is formed. This creates a difference in pressure either side of the jet and hence a force is exerted on the jet.

Obstacle

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Oscillation Chamber (cont.)

The force causes the jet to bend to the other side of the cavity where the same effect will be seen.

This oscillation only depends on the volume of gas passing through the nozzle. One oscillation cycle will represent a characteristic volume of gas.

Obstacle

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Detecting the Oscillations – Making it a meter

The key to deriving the volume is to ‘count’ the number of fluidic oscillations. The example above uses a thermal sensor and produces a sinusoidal ‘pulse’ to electrically monitor the oscillation.

Sensors

R1

R2

V

Sensor ResistanceR = R1 - R2

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THE DATTUS III METER / 11

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THE DATTUS III METER / 12

ATTRIBUTE

The DATTUS III meter has no moving parts.

BENEFITS

»Will not “lock-up”.

»With no impellers, can handle fast on/off applications even in short meter runs.

»Ensures continuous gas flow even under failure conditions

»Eliminates need for parallel meter runs where design goal is continuity of gas service, hospitals for example

SOLID-STATE MEASUREMENT

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THE DATTUS III METER – CHANGING C&I METERING/ 13

ATTRIBUTE

Solid-State measurement and the associated packaging

BENEFITS

»Can reduce number of set designs• Offers 2” flange up to 11M• Offers 4” flange up to 56M

»Eliminate parallel runs designed for safety or for seasonal loads

»No upstream piping requirements

»Smaller set design for larger capacity meters

SET DESIGN ADVANTAGES

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THE DATTUS III METER / 14

ATTRIBUTE

Design implications on periodic maintenance and verification requirements

BENEFITS

»Easier to install• Aligned flanges not critical• Level installation not necessary

»Requires no oil

»May be differential pressure tested

»Only regular maintenance item is battery change

»No damage from “overspin”

LOWER IN-SERVICE COSTS

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THE DATTUS III METER / 15

ATTRIBUTE

Electronics lends itself to incorporation of certain feature sets and the ability to record information

Features

»Built-in temperature compensation

»Four pulse output channels

»Datalogging

»Programmable fixed pressure compensation

»Event logging

»Alarm indications

FEATURE SET DIFFERENTIATION

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THE DATTUS III METER / 16

DATTUS III SIZE/CAPACITIES

Model 8C 1M 1.5M 2M 3M 5M 7M 11M 16M 23M 38M 56M

fM1 x x x x xfM2 x x x x xfM3 x x x x x x

Model Start Flow (CFH)

Flow rate for +/- 2% acc.

Flow rate for +/- 1 % acc.

Maximum Capacity (CFH)

fM1 8 10 35 3750

fM2 18 22 60 13750

fM3 45 60 100 57000

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THE DATTUS III METER / 17

UPGRADEABILITY

ATTRIBUTE

A DATTUS III meter may have its capacity upsized to any capacity within the range of the model

BENEFIT

»Allows for reduced and very flexible inventory

»Can significantly reduce operational costs associated with meter size changes in the field

»Allows for more right-sizing of the meter

EXAMPLE:

fM1 – 8C

fM1 – 1M

fM1 – 1.5M fM1 – 2M

fM1 – 3M

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New Design Features in DATTUS IIISensor Technology; Functionally, they are thermal sensors, same as previously generation

DATTUS. Sensors are encapsulated in glass, but sensitive enough to detect

oscillations of the gas. The glass coating considerably improves the robustness of the sensors.

Sensitivity to liquids also greatly improved.

Integral TC; The sensor boards in the meter also include a component for temperature

measurement. Temperature compensation may be activated or deactivated by the

customer. Offers accuracy of +/- 1.8 F (1.0 C)

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THANK YOU