The Armfield Flow Meter Demonstration Unit is a self-contained facility to demonstrate the important characteristics of flow meters.

The main elements are a service module and flow meter support stand.

A self-priming centrifugal pump draws water from the sump tank in the service module and delivers it to a flow meter test pipe.

Industrial-type flow meters mounted in test sections can be fitted into the test pipe quickly and easily. These meters have been chosen to give a variety of different metering principles and degrees of

sophistication and accuracy. Some of the meters are calibrated directly in units of flow, while others involve the use of calibration charts.

The pressure drop across each of the flow meters can be measured by using either the one-metre pressurised water manometer or the 0.5-metre mercury manometer supplied.

Ported manometer connection valves ensure rapid bleeding of all manometer pipework. A facility exists to admit air into the hydraulic stream

to demonstrate the effect on the meter’s accuracy. The discharge from the test section is controllable and is fed through a diffuser into the channel of the service module. A V-notch and rectangular notch weir can be fitted into the service module.

An auxiliary channel (C9-15) accommodates the broad-crested and crump weirs, as well as the ‘H’ flume and Washington flume. Levels in the channel can be determined by using the Hook and Point Gauge (H1).

Water discharging from the flow meter on test is collected in a volumetric tank where the flow may be determined absolutely.

This tank is stepped to accommodate high or low flow rates and incorporates a stilling baffle to reduce turbulence. A remote sight tube and scale connected to a tapping in the base of the volumetric tank enable an instantaneous indication of water level. Water is returned

to the sump tank by a dump valve. The basic system incorporates a reference flow meter, which has been chosen for reliability and accuracy. This meter remains installed whereas other meters are selected from their storage position on the apparatus and tested as desired.

In addition to being a valuable teaching aid, the apparatus brings to the laboratory a selection of instruments that can be used to support student project work. A full set of instructions is provided, including details for testing and comparison of flow meters.

Technical specifications
Maximum flow rate	2.3l/s
Reservoir capacity	140l
Volumetric tank capacity	40l
Nominal bore of pipework	38mm
Length of removable test pipe	750mm
Pump motor rating	0.55kW

Overall dimensions
Length	3.50m
Width	1.00m
Height	1.50m
Packed and crated shipping specifications
Volume	3m3
Gross weight	400Kg

Ordering specification

A self-contained apparatus to demonstrate the characteristics of flow meters used in measurement of water flow through pipes or open channels

Service module with reservoir, volumetric measuring tank and pump

Reference paddle wheel meter with a digital indicator is permanently fitted

Metering devices available in various combinations to suit coursework

Selection from 14 devices:

– Venturi

– Orifice

– Pitot

– Shunt gapmeter

– Swinging flap

– Volumetric rotary piston

– Electromagnetic

– Helical rotary

– Inferential multi-stream

– Current meter

– Broad Crested Weir

– Crump Weir

– ‘H’ Flume

– Washington Flume

Quick and easy removal of test meters for evaluation and inspection

Air entrainment facility

Meters can be used independently to support research or student project work

User instruction manual provides installation, commissioning and maintenance data, together with project exercises

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