Blease FRONTLINE Genius Service Manual Issue 2 Sept 2002

Frontline Genius

Important Read this manual before operating or servicing the machine. Read the vaporizer manual before operating the machine. For all users and Service Personnel, refer to the User Manual before operating the machine.

Service Manual

Frontline Genius

Contents

Table of Contents Introduction ...i Produce Improvement ... vi Important Information ... vi Responsibilities of the manufacturer ... vi Note to Service Personnel ... vi Copyright ... vii Trademarks and Acknowledgements ... viii Symbols and Abbreviations ... ix Warnings and Cautions ... x Electrostatic Sensitive Devices (ESD) Warnings and Cautions ... xi

Section 1 - Routine Preventative Maintenance ...1 1.1 Service Schedule ... 1 1.2 Test Equipment ... 2 1.2.1 Pneumatic Testing ... 2 1.2.2 Electrical Testing ... 2 1.3 Detailed Maintenance Checks ... 3 1.3.1 Overall Visual Inspection ... 3 1.3.1.1 Visual Inspection ... 3 1.3.1.2 Structural ... 3 1.3.1.3 Castors ... 4 1.3.1.4 Common Gas Outlet (Cardiff Swivel Type) and Oxygen Flush Operation ... 4 1.3.1.5 Ancillary Equipment and Mountings ... 4 1.4 Overall Performance Check ... 4 1.4.1 On/Off Switch Test ... 5 1.4.1.1 Oxygen Regulator Pressure and Leak Test ... 5 1.4.1.2 Non-O2 Regulator Pressure and Leak Test... 5 1.4.1.3 Pipeline Leak Test ... 6 1.4.2 On/Off Switch Test ... 7 1.4.3 Air Interlock Switch Test ... 7 1.4.4 N2O / Air Interlock Switch ... 7 1.4.5 Anti-Confusion Testing... 8 1.4.6 Oxygen Supply Failure Warning ... 8 1.4.7 Oxygen Flush Control Tests ... 9 1.4.8 High Pressure Outlets ... 9 1.4.9 Flow Control Valve Mechanical Tests ... 9 1.4.10 Checking the Flowmeter Accuracy ... 10 1.4.11 Mechanical Hypoxic Guard Tests ... 10 1.4.12 Machine or Common Gas Outlet Safety Valve Tests ... 11 1.4.13 Backbar Test... 11 1.4.14 Backbar Valve Test ... 11 1.4.15 Checklist and Calibration Record ... 13 1.5 Maintenance Spares... 15

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Contents

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Section 2 - Removal/Replacement Instructions ... 16 2.1 Test Index for Replaced Items... 17 2.2a Detailed Instructions ... 18 2.2.1a Pneumatics Access ... 18 2.2.1.1 Work Surface ... 18 2.2.1.2 Rear Cover ... 18 2.2.2a Flexible Tube ... 18 2.2.3a Backbar... 18 Removal... 18 Replacement... 18 2.2b Detailed Instructions ... 19 2.2.1 Non Return Valves ... 19 2.2.1.1a Non-Return Valves (up to and including Oct.97) ... 19 2.2.1.2b Non-Return Valves (from Nov.97) ... 19 2.2.2 Seal Replacements... 20 2.2.2.1 Yoke Seals ... 20 2.2.2.2 Selectatec Backbar Seals and Dzus Springs ... 20 2.2.3 Flowmeter Tubes, Filter and O-ring (All Machines) ... 20 Removal ... 20 Tube Replacement ... 21 2.2.4 Flow Control Valves (except O2 and N2O) (All Machines) ... 23 Removal ... 23 Replacement ... 23 2.2.5 Mechanical Hypoxic Guard Assembly ... 23 Removal ... 23 Replacement ... 24 2.2.6 Oxygen Flush Restrictor (All Machines) ... 24 2.2.7 Oxygen Flush Control (All Machines) ... 24 2.2.8 Pneumatic Power Outlets (All Machines) ... 24 Removal ... 24 Replacement ... 25 2.2.9 Air Entrainment Valve/Common Gas Outlet Non-return Valve ... 25 Removal ... 25 Replacement ... 25 2.2.10 On/Off Switch (All Machines) ... 26 2.2.11 N2O / Air Interlock Switch ... 26 2.2.12 Oxygen Failure Warning Device Reservoir ... 27 2.2.13 Cylinder Regulator ... 27 2.2.14 Yoke ... 28 2.2.15 Pipeline Inlet ... 28 2.2.16 Oxygen Failure Warning Device Cut-Out Valves (Nitrous Oxide / Carbon Dioxide / Reed) up to and incl. April 99 ... 29 2.2.17 Oxygen Failure Warning Device from May 1999... 29

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Contents

Section 3 - Technical Description ... 30 3.1 Description ...30 3.1.1 General...3 0 3.1.2 Pneumatic Unit ...32 3.1.3 Monitor Shelf ...33 3.1.4 The Hypoxic Guard ...33 3.1.5 Detachables ...33 3.2 Specification ...33 3.2.1 Machine Dimensions ...33 3.3 Pneumatics ...34 3.3.1 Gas-specific Colour Specifications ...34 3.4 Miscellaneous ...34 3.4.1 Vaporizer Mountings...34 3.4.2 Common Gas Outlet ...34 3.4.3 Oxygen Flush ...34 3.4.4 Oxygen Failure Warning Device ...34 3.4.5 Oxygen Monitor ...35 3.4.6 Alarms ...35 3.4.6.1 All Machines ...35 3.5 System Operation ...40 3.5.1 Oxygen System ...40 3.5.2 Nitrous Oxide System ...41 3.5.3 Medical Air System ...42

Section 4 - Repair and Calibration... 43 4.1 Introduction ...43 4.2 Adjustments ...43 4.2.1 Regulator Output Pressure ...43 4.2.2 Oxygen Flush Flow ...44 4.2.3 Oxygen Failure Warning Device Alarm Time Constant ...45 4.2.4 Mechanical Hypoxic Guard Regulators ...45 4.2.4.1 Nitrous Oxide Leak ...46 4.2.4.2 Reset Oxygen Basal Flow ...47 4.2.4.3 Oxygen Gear Setting ...47 4.2.4.4 Oxygen Valve Resetting ...48

Section 5 - Replaceable Parts Index ... 49 Ordering ...50

Appendix A - Frontline Genius Oxygen Monitor ... 51 A.1.1 Routine Maintenance ...51 A.1.1.1 Service Schedule ...51 A.1.1.2 Test Equipment ...51 A.1.1.3 Detailed Maintenance ...51 A.1.1.3.1 Oxygen Monitor Calibration ...51 A.1.1.3.2 Fitting a New Oxygen Sensor ...52 A.1.1.3.3 Overall Visual Inspection ...52 A.1.1.4 Overall Performance Check ...52 A.1.1.4.1 Mute Operation ...53 A.1.1.4.2 Disconnect Alarm ...53

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Contents

A.1.1.4.3 Turning the Oxygen Monitor Off ... 53 A.1.1.4.4 Oxygen High and Low Alarms ... 53 A.1.1.4.5 Oxygen Sensor Linearity ... 54 A.1.1.4.6 Checklist and Calibration Record ... 55 A.1.1.5 Maintenance Spares ... 56

Appendix B - Diagrams and Assembly Details ... 57 B.1.1 Pneumatics Layout (up to and including April 1999) ... 57 B.1.2 Pneumatics Layout (from May 1999)... 58 B.2 8200s Mounting Bracket... 59 B.3 Flowmeter (cascade hypoxic) All Frontline Genius Machines ... 60 B.4 Oxygen Monitor ... 61 B.5 Cylinder Box ... 62

Appendix C - Circuit Diagrams ... 63 C.1 C.2 C.3

Oxygen Monitor Interconnection Schematic (12400600) ... 63 Oxygen Monitor PCB Assembly (12100075)... 64 Oxygen Sensor Interface PCB and Lead ... 65

List of Figures Figure 1 Frontline Genius Anaesthetic Machine ... 31 Figure 2 Pneumatic Circuit (Genius machines up to and including April 1999) ... 36 Figure 3 Pneumatic Circuit (Genius machines from May 1999) ... 38

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Important Read this manual before operating or servicing the machine. Read the vaporizer manual before operating the machine. For all users and Service Personnel, refer to the User Manual before operating the machine.

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Introduction

Frontline Genius

Product Improvement Blease Medical Equipment Limited has a policy of continued product improvement and therefore reserves the right to make changes which may affect the information contained in the manual without giving prior notice.

Important Information In order to be able to identify the date of manufacture of the machine, so that the relevant sections of this manual are followed, please read the following. The serial number contains the month and year of manufacture. It can be found either on the rear, inside face of the left hand upright frame member on old machines, or on the inside edge of the electrical sockets on later machines. For example: 1541197 154

= series number

11

= month (November)

97

= year (1997)

It is essential that the whole number is quoted in any communication with Blease Medical Equipment Limited so that the machine can be accurately identified.

Responsibilities of the Manufacturer The manufacturer accepts responsibility for the effects on safety, reliability and performance of the equipment only if assembly operations, extensions, adjustments, modifications and repairs are carried out by persons with written authorisation from the manufacturer, and the equipment is used in accordance with the instructions for use.

Note to Service Personnel The Blease Frontline Genius must only be serviced by Qualified Service Personnel. The contents of this manual are not binding. If any significant difference is found between the product and this manual please contact Blease Medical Equipment Limited for further information. To ensure correct functioning, the equipment must be serviced at regular intervals. Blease Medical Equipment Limited recommends that the machine should be serviced at intervals not exceeding three months. Qualified Service Personnel and genuine spare parts should be used for all servicing and repairs. Blease Medical Equipment Limited will not otherwise assume responsibility for the materials used, the work performed or any possible consequences of the same.

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Introduction

In communication with Blease Medical Equipment Limited, quote the model and serial number of the equipment, with the approximate date of purchase. If the unit is being returned for repair, indicate the nature of the fault or the work you require to be carried out. Contact: Blease Medical Equipment Limited Beech House Chiltern Court Asheridge Road Chesham Buckinghamshire HP5 2PX England Tel: +44 (0)1494 784422 Fax: +44 (0)1494 791497 www.blease.com [email protected]

Copyright ©1999, Blease Medical Equipment Limited. All rights reserved. The information contained in this publication may not be used for any other purpose than that for which it was originally supplied. This publication may not be reproduced in part or in whole without the written consent of Blease Medical Equipment Limited.

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Trademarks and Acknowledgements

Frontline Genius

Trademarks and Acknowledgements The following symbols and acknowledgments may appear in Blease product manuals:

is the trademark of Abbott Laboratories.

Datum® is a registered trademark of Blease Medical Equipment Limited UK. Dowty is a trademark of Dowty Seals Limited. Dräger is a trademark of Drägerwerk AG Germany. Dzus is a trademark of Dzus Fasteners Limited. Fomblin® is a registered trademark of Rocol Limited. Frontline Plus® is a registered trademark of Blease Medical Equipment Limited. Frontline Genius® is a registered trademark of Blease Medical Equipment Limited. Legrand® is registered trademark of Legrand Electric Limited. Loctite® is a registered trademark of UK Limited. Megger is a trademark of AVO Megger Instruments Ltd. Plug-in® is a registered trademark of Drägerwerk AG Germany. Quik-Fil® is a trademark of Abbott Laboratories. Rigel is a trademark of Seaward Electronics Ltd. Scotchbrite® is a registered trademark of 3M. Selectatec® is a registered trademark of Ohmeda/BOC UK Ltd. Snoop® is a registered trademark of the Nupro® Company Ohio USA.

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Symbols and Abbreviations

Symbols and Abbreviations

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Warnings and Cautions

Frontline Genius

Warnings and Cautions The following statements are made to comply with the requirements of EN 60601-1 1.

This equipment must only be connected to gas pipeline supply lines that are fitted with pressure relief valves that limit the supply pressure to less than 7 bar.

2.

The functioning of this machine may be adversely affected by the operation of equipment such as high frequency surgical (diathermy) equipment, defibrillators or shortwave therapy equipment in the vicinity. Increasing the distance from such equipment will minimise any possible interference.

3.

Prior to connecting the machine to a patient carry out the pre-use check to verify correct alarm operation. To verify the O2 alarm, set the flowmeters to give a concentration of 50% oxygen. Using the controls on the oxygen monitor panel, set the low oxygen level to 60% and verify the oxygen low alarm operates. Set the high oxygen alarm level to 40% and verify that the oxygen high alarm operates.

4.

The oxygen flow can only be reduced to zero by turning the ON/OFF switch to the OFF position. Excessive force on the oxygen control knob may damage the hypoxic guard.

5.

Mains sockets are fitted, therefore it should be noted that: ‘The connection of EQUIPMENT to the AUXILIARY MAINS SOCKET OUTLET(S) may increase the patient leakage currents to values exceeding the allowable limits in the event of a DEFECTIVE PROTECTIVE EARTH CONDUCTOR’.

6.

To avoid explosion hazards, flammable anaesthetic agents such as ether and cyclopropane must not be used in this machine. Only anaesthetic agents which comply with the requirements on nonflammable anaesthetic agents in IEC 60601-213 ‘Specification for Anaesthetic Machines’, are suitable for use in this machine.

7.

As this machine is not suitable for use with flammable anaesthetic agents such as ether and cyclopropane the use of antistatic breathing tubes and face masks is not necessary. The use of antistatic or electrically conductive breathing tubes when utilising high frequency surgery equipment may cause burns and is therefore not recommended in any application which involves such apparatus.

8.

This equipment must be periodically checked and maintained to ensure proper operation.

9.

Performance of this equipment may be affected at temperatures below 10oC (50oF) and above 40oC (104oF).

10.

The performance of the anaesthetic machine and vaporizer may be degraded if the two are mismatched. Refer to the vaporizer manufacturer’s instruction manual before use.

11.

If the integrated oxygen analyser is not fitted, an oxygen analyser complying with ISO 7767 must be used when the anaesthetic machine is in use.

12.

This unit uses semiconductor devices which are susceptible to damage by overloading, reversed polarity, electrostatic discharge and excessive heat or radiation.

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Warnings and Cautions

Warnings and Cautions cont. 14.

Avoid hazards such as reversal of batteries, prolonged soldering, strong RF fields or other forms of radiation, use of insulation testers or accidentally applied short circuits. Even the leakage current from an unearthed soldering iron may cause trouble.

Electrostatic Sensitive Devices (ESD) Warnings and Cautions All ESD must be stored in approved conductive packaging, tubes, shipping bags, foam or tote bins. All persons handling ESD must be properly grounded via a 1MW resistive grounded wrist strap. Cover all ESD bench tops with grounded conductive mats and connect all work surfaces and equipment to earth ground. Transport all assemblies containing ESD in a conductive bag or container. DO NOT use cellophane adhesive tape to wrap DIP (dual in-line package) tubes together. DO NOT handle ESD by their pins or mix them with other routine electronic parts. Never place ESD on ungrounded surfaces or leave them unattended in an open area. Avoid cellophane wrappers, synthetic (non-conductive) carpeting, warm or cool air blasts, Styrofoam coffee cups, etc when working with ESD. Use only properly designed heat lamps, heat chambers and/or ‘antistatic’ quick-chill sprays during troubleshooting or stress testing procedures. The following assemblies in the Frontline Genius O2 Monitor and backlight are easily damaged by electrostatic discharges and require special handling:

See Section 2. Removal/Replacement Instructions for details of version changes.

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1. Routine Preventative Maintenance

Routine Preventative Maintenance This chapter contains information for keeping the equipment in good working order and checking its overall performance.

1.1

Service Schedule The following service/replacement intervals are recommended. Complete all the itemised checks in the order stated, that is, complete all replacements first, then all maintenance checks, and finally performance checks.

Every 6 months: Replacements

Reference

Mark 4 Selectatec O-rings

2.2.2.2 Selectatec Backbar Seals

Bodoc seals (cylinder)

2.2.2.1 Yoke Seals

Maintenance Checks Overall visual inspection

1.3.1 Overall Visual Inspection and A.1.1.3.3 Overall Visual Inspection

Oxygen Monitor Calibration

A.1.1.3.1 Oxygen Monitor Calibration

Cylinder pressure/leaks

1.4.1.3 Pipeline Leak Test

Performance Checks Overall performance check

1.4 Overall Performance Check

Every 12 Months: All 6 month checks, with the addition of: Replacements Reference Clean flowtubes

2.2.3 Flowmeter Tubes, Filter and O-Ring

Flowtube O-rings

2.2.3 Flowmeter Tubes, Filter and O-Ring

Flowtube filter

2.2.3 Flowmeter Tubes, Filter and O-Ring

Common gas outlet O-ring

2.2.9 Air Entrainment/Common Gas Outlet Valve Assembly

Dzus spring on Mk 4 backbar

*2.2.2.2 Selectatec Backbar Seals and Dzus Springs

Performance Check O2 monitor performance

A.1.1.4 Overall Performance Check

* See Chapter 2 Removal/Replacement Instructions for details of version changes.

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Frontline Genius

1. Routine Preventative Maintenance

Every 4 years: All 12 month checks, with the addition of:

1.2

Replacements

Reference

Cylinder regulators

1.4.1 Cylinder Regulator Pressure and Leak Tests

Hypoxic regulators

1.4.11 Mechanical Hypoxic Guard Tests

External pipelines

1.4.1.3 Pipeline Leak Test

Test Equipment

1.2.1 Pneumatic Testing •

0 to 100 psi gauge with mini-Schräder air outlet*

•

0 to 100 psi gauge with mini-Schräder oxygen outlet*

•

60 l/m oxygen flowmeter with 22mm taper inlet*

•

O2 anaesthesia flowmeter(s)*

•

N2O

•

Air anaesthesia flowmeter(s)

•

CO2 anaesthesia flowmeter(s)

•

0 to 12 psi pressure gauge*

•

0 to 100cm H2O pressure gauge*

•

O2/Air/N2O pin index cylinder gauge assemblies with Schräder output

•

0 to 200mm Hg pressure gauge*

•

Blease Backbar Test Kit Part No: 930210

anaesthesia flowmeter(s)

Blease anaesthesia machine test kits (contain items marked * above).

1.2.2 Electrical Testing •

2

No mains electrical devices are fitted within the Genius.

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1.3

1. Routine Preventative Maintenance

Detailed Maintenance Checks See 1.5 Maintenance Spares for ordering information on service items, 2 Removal/ Replacement Instructions if any items need to be replaced and 4.2 Adjustments for adjustment instructions.

1.3.1 Overall Visual Inspection Should any of the checks indicate a mechanical fault, damage or deterioration, the item should be adjusted or replaced. 1.3.1.1 Visual Inspection Check that the following are free from damage and are securely mounted to the machine and/or their fittings: •

Yoke Blocks, their index pins and bridges;

•

Pipeline Inlets;

•

Pipeline hoses for deterioration or damage;

•

Pipeline ferrules and colour coding; tug test to ensure they remain intact;

•

Absorber bracket;

•

Pneumatic power outlet;

•

Backbar and its adapters (if fitted);

•

Oxygen Flush Assembly;

•

Common Gas Outlet;

•

Flowmeter assembly and control knobs;

•

Castor, buffers and fixings;

•

O2 monitor and its controls (if fitted);

•

Writing Shelf;

•

Pneumatic components including the regulators, reservoir, etc and the associated nuts, screws, couplings and pipework.

1.3.1.2 Structural Check the general condition of the structure, and that welded joints are free from cracks. Check that all screws are tightened and in good condition.

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1. Routine Preventative Maintenance

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1.3.1.3 Castors 1. Ensure the castors are located securely within the frame feet. 2. Check that each castor’s fixings are secure. 3. With the footbrakes released, ensure that the trolley can be pushed or pulled in any direction without the castors feeling ‘lumpy’ or stiff, producing squeaks or grinding noises or exhibiting excessive chatter or wobble. 4. Hold the sides of the machine frame and keeping the castors pointing in the same direction rotate the trolley in a counter-clockwise and clockwise circle and ensure that each of the castors rotates without stiffness or jerks through 360o in both directions. 5. Press on the footbrakes and check that as the trolley is pushed or pulled the front castors remain locked. 6. Release the footbrakes and check that the front castors rotate freely as the trolley is pushed or pulled. 7. Lubricate the castors if necessary.

1.3.1.4

Common Gas Outlet (Cardiff Swivel Type) and Oxygen Flush Operation

1.

Check that there is no excessive up and down movement of the 22mm connector as the swivel is rotated, and that there are no tight or excessively loose spots and the swivel stops are undamaged.

2.

Check that the surface of the 22mm connector is free form damage.

3.

Check that the oxygen flush button operates smoothly and extends fully when released.

1.3.1.5

Ancillary Equipment and Mountings

1.

Check that the operation of the brackets, clamps and arms used to mount ancillary equipment is smooth and not over-tight or too loose.

2.

Visually inspect circuits, ensuring both inner and outer tubes (if fitted) are properly located on the hose end fittings, and not twisted or kinked.

3.

Visually inspect all external rubber tubing, reservoir bags and patient system connectors. For other items, refer to the appropriate Service Manual.

1.4

Overall Performance Check

Before starting the performance checks, ensure all replacements and maintenance checks have been fully completed and the machine is fully reassembled, then allow at least 10 minutes for the oxygen monitor to warm up. The checklist (see 1.4.15 Checklist & Calibration Record) and calibration record summarise the relevant tests and calibration points covered in this overall performance check. A copy of this section can be made and filled in as a permanent record. The checks should be performed in the order shown. If any tests fail, see the appropriate section in 4 Repair and Calibration. 4

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1. Routine Preventative Maintenance

1.4.1

Cylinder Regulator Pressure and Leak Tests

1.4.1.1

Oxygen Regulator Pressure and Leak Test

1.

Ensure that no cylinders or pipelines are connected to the machine, all the flow control valves are turned fully clockwise, and that no equipment is plugged into the pneumatic outlets.

2.

Disconnect or remove any Selectatec vaporizers and store them safely.

3.

Remove any equipment not secured to the monitor shelf, and any equipment from the standard shelf or facia (if fitted).

4.

Connect a standard low pressure gauge capable of reading 0 to 100 psi to an accuracy of ±5% into the auxiliary oxygen output.

5.

Couple an oxygen cylinder to the regulator yoke.

6.

Slowly open the cylinder and check that the oxygen cylinder contents gauge registers the cylinder pressure, and that the standard gauge registers 52 psi ± 2 (3.5 bar). Check for correct gas correspondence between cylinder, gauge and flowmeter.

Note that the oxygen failure warning device may be momentarily activated when the oxygen cylinder is first turned on. Allow 15 seconds for the reservoir to fill. 7.

Operate the oxygen flush and check that the standard gauge registers between 42-52 psi (2.8 - 3.5 bar) as the flush is being operated.

8.

Release the flush control and check that the standard gauge registers between 52 psi ± 2 (3.5 bar) when the flow has ceased.

9.

Close the cylinder and check that the reading on the contents gauge does not fall by more than a half division in three minutes.

10.

Operate the oxygen flush until the contents gauge reads zero.

1.4.1.2

Non-O2 Regulator Pressure and Leak Test

1.

Ensure that only one O2 cylinder or O2 pipeline is attached to the machine and turned on. Disconnect all other pipelines and cylinders. Ensure that all the flow control valves are turned fully clockwise, and that no equipment is plugged into the pneumatic outlets.

2.

Gain access to the regulators by removing the cylinder box cover.

3.

Disconnect the N2O regulator output line and couple a T-piece between the regulator output and its coupling to the non-return valves. Connect the pressure gauge to the pressure tapping of the T-piece.

4.

Couple an N2O cylinder to the regulator yoke.

5.

Slowly open the cylinder and check that the cylinder contents gauge registers the cylinder pressure, and that the standard gauge registers 52 psi ± 2 (3.5 bar).

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1. Routine Preventative Maintenance

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6. Operate the gas flow control valve until its flowmeter reads its maximum, and check that the standard gauge registers between 46-52 psi (3.1 - 3.5 bar). Check for correct gas correspondence between the cylinder gauge and flowmeter. 8. Close the flow control valve and check that the standard gauge registers between 52 psi ± 2 (3.5 bar) when the flow has ceased. 9. Remove the T-piece and re-couple the output of the regulator into the machine. 10. Open the cylinder and check that the cylinder contents gauge registers the cylinder pressure. 11. Close the cylinder and check that the reading on the contents gauge does not fall by more than half a division in three minutes. 12. Open the flow control valve until the contents gauge reads zero.

N2O cylinder gauges do not have division markings. Check that the gauge pointer does not fall the equivalent distance in three minutes. 1.4.1.3

Pipeline Leak Test

1. Ensure that: • no cylinders are attached to the machine; • all the flowmeter controls are turned fully clockwise; • no equipment is plugged into the pneumatic power outlets; • the machine is switched off; • the pipeline supplies are connected directly to a cylinder and not to the wall pipeline outlet.

regulator and

2. Turn on the cylinder and check that the pipeline supply pressure gauge is indicating the pipeline supply pressure, 60 psi (4 bar). 3. Shut off the cylinder and check that the gauge indication does not decrease by more than half a division in three minutes. 4. Repeat the above for all the pipeline supplies.

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