Manometro

TEACHING MANUAL

F1-11

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DEAD WEIGHT CALIBRATOR

F1-11

ISSUE 2

JULY 1999

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ARMFIELD LIMITED

OPERATING INSTRUCTIONS AND EXPERIMENTS

F1-11

PAGE NO. SAFETY IN THE USE OF EQUIPMENT SUPPLIED BY ARMFIELD I INTRODUCTION 2

DESCRIPTION 3

NOMENCLATURE 4

EXPERIMENT A A-I TECHNICAL DATA A-I

SAFETY IN THE USE OF EQUIPMENT SUPPLIED BY ARMFIELD

Before proceeding to operate the equipment described in this text we wish to alert you to potential hazards so that they may be avoided.

Although designed for safe operation, any laboratory equipment may involve processes or procedures which are potentially hazardous. The major potential hazards associated with this particular equipment are listed below.

• INJURY THROUGH MISUSE

• INJURY FROM ELECTRIC SHOCK

• DAMAGE TO CLOTHING

Accidents can be avoided provided that equipment is regularly maintained and staff and students are made aware of potential hazards list of general safety rules is included in the F 1 Product Manual to assist staff and students in this regard. The list is not intended to be fully comprehensive but for guidance only.

Please refer to the notes in the Fl Product Manual regarding the Control of

Substances Hazardous to Health Regulations,

The FI-IO Service Bench operates from a mains voltage electrical supply. The equipment is designed and manufactured in accordance with appropriate regulations relating to the use of electricity. Similarly, it is assumed that regulations applying to the operation of electrical equipment are observed by the end user.

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However, to give increased operator protection, Armfield Ltd have incorporated a Residual Current Device (RCD, alternatively called an Earth Leakage Circuit Breaker or ELCB) as an integral part of this equipment. If through misuse or accident the equipment becomes electrically dangerous, an RCD will switch off the electrical supply and reduce the severity of any electric shock received by an operator to a level which, under normal circumstances, will not cause injury to that person.

Check that the RCD is operating correctly by pressing the TEST button. The circuit breaker MUST trip when the button is pressed. Failure to trip means that the operator is not protected and the equipment must be checked and repaired by a competent electrician before it is used.

INTRODUCTION

Fluid mechanics has developed as an analytical discipline from the application of the classical laws of statics, dynamics and thermodynamics, to situations in which fluids can be treated as continuous media. The particular laws involved are those of the conservation of mass, energy and momentum and, in each application, these laws may be simplified in an attempt to describe quantitatively the behaviour of the fluid.

The Hydraulics Bench Service Module, FI-I0, provides the necessary facilities to support a comprehensive range of hydraulic models each of which is designed to demonstrate a particular aspect of hydraulic theory.

The specific hydraulic model that we are concerned with for this experiment is the

Dead Weight Calibrator, Fl-ll

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DESCRIPTION

Calibration

Weights

Piston

Cylinder

Spirit

Level

M-- ":--------- Gauge Under

Calibration

The Fl-ll Dead Weight Calibrator accessory comprises a precision ground piston and cylinder. Weights may be added to the piston so that a number of predetermined pressures may be set up within the cylinder. The cylinder is mounted on a' baseboard which is supported on levelling screws and fitted with a spirit level.

The gauge under test is linked to the cylinder connection by a flexible tube.

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Leakage of water past the piston is taken to waste through connection to a second flexible tube. This tube is connected to a tapping which is drilled into the cylinder and is opposite an annular recess in the cylinder.

NOMENCLATURE

Column Units Nom. Type Description

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