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Model 7000 Series Turbine Flowmeter Section 1

Section1—Introduction

Barton 7000 Series Flowmeters

Barton 7000 Series owmeters are specially designed to accommodate a

broad range of precise uid measurement applications. They can accept larger

ow rates with lower pressure drops than other meters in their class, and fea-

ture a self-ushing design for longer sustained accuracy. Their high-frequency

digital output is ideal for interfacing with digital readout equipment. The 7000

Series' symmetrical bi-directional design supports reverse ow applications,

without reducing accuracy or ow capacity.

All meters are shipped with a pickup coil. Each meter assembly includes two

locknuts, two ow straightener tube assemblies, a center shaft, two diffus-

ers, and a rotor, and is factory-calibrated with water. Bearing type varies with

models: Models 7100 and 7300 feature wear-resistant tungsten carbide sleeve

bearings and thrust washers. Models 7200 and 7400 feature self-lubricating,

precision stainless steel ball bearings. The Model 7400 features bearings with

dry lubricant impregnated ball separators.

During operation, uid passes over the diffuser section and is accelerated onto

a multi-blade hydro-dynamically balanced turbine rotor. The rotor speed is

proportional to the volumetric ow rate. As the rotor turns, a reluctance type

pickup coil (mounted on the meter) senses the passage of each blade tip and

generates a sine wave output with a frequency that is directly proportional to

the ow rate.

The rotor is the only moving part of the Barton turbine owmeter. The small

lightweight rotor hubs ensure fast response to process ow changes. The rotor

is hydro-dynamically balanced during operation, eliminating the need for me-

chanical thrust leveling. This low-friction design improves metering linearity

and reduces wear and maintenance.

The pickup coil is inserted into a conduit adapter that is welded to the outside

of the turbine body. The boss is explosion-proof/ameproof with 3/4" male

NPT electrical threads. The pickup coil can be removed for troubleshooting

without depressurizing the meter or stopping uid ow.

Specications—7000SeriesTurbineFlowmeters

Electrical Classication

• Explosion-proof/Flameproof CSA listed Class I, Division 1, Group

B,C,D; Class II, E,F,G; Class III, Enclosure 4 waterproof to NEC (USA)

and CEC (Canadian) standards, including single seal certication to

ANSI 12.27.0-1

Sensia Barton 7000 Series User Manual

Questions and Answers: