Dr ger PAS Micro Series Airline/E Scape Compressed Air Respiratory Instructions

Dr ger PAS Micro Series Airline/E Scape Compressed Air Respiratory

Product Information

This product is a warning unit (LPWWU) that includes a valve cylinder assembly with contents indicator. It is available in 10, 15, or 20 minute escape duration versions. The equipment features a high-performance first stage pressure reducer and an integral lung demand valve. It is compatible with various face masks and compressed air cylinders. When used with an approved carrying system, valved cylinder assembly, LDV, and face mask combinations, this equipment provides respiratory protection for working in or escaping from a contaminated or oxygen-deficient gaseous atmosphere. The effective duration of the equipment during escape depends on the selected cylinder capacity and the wearer’s breathing rate.

Product Usage Instructions

1. Ensure that the equipment is used for its specified purpose as mentioned in the instructions.
2. Consider potential hazards and probable escape routes when selecting the type and duration of escape equipment.
3. For airline working sets, the escape duration starts from the time of opening the cylinder valve and disconnecting the airline supply.
4. Check the European standards, guidelines, and directives for product approvals in the declaration of conformity or at www.draeger.com/product-certificates.
5. Avoid using oxygen or oxygen-enriched air for compressed air breathing systems.
6. Ensure that the air quality for compressed air breathing systems conforms to the requirements of EN12021.
7. Perform the following checks and preparation procedures before using the equipment:
8. Perform a visual inspection to check the integrity of the back carrying harness with cylinder strap, shoulder straps, and waist belt.
9. Fit the cylinder by placing the carrying harness on a clean flat surface and extending the cylinder strap, shoulder straps, and waist belt.
10. Check the contents indicator to ensure the cylinder is fully charged. The contents indicator needle must align with the nominal charged pressure indicator (200 or 300 bar).
11. Slide the cylinder through the strap, locating the valve port to the reducer hand wheel. Take caution to prevent damage to the hand wheel.
12. Align the cylinder centrally with the carrying harness and screw the hand wheel of the pressure reducer (clockwise) to the port of the valve. Do not tighten.

Approvals

The European standards, guidelines, and directives according to which this product is approved are specified in the declaration of conformity (see declaration of conformity or www.draeger.com/product- certificates).

For Your Safety

This variant of the Dräger PAS® Micro Series of equipment incorporates a preset and sealed pressure reducer. The associated lung demand Valve (LDV) has a preset and sealed balanced piston unit assembly. The Dräger guarantee is void should original sealing caps of these units be tampered with, removed, or broken. Correct operational condition is only valid if Dräger service and re- seals the pressure reducer and balanced piston unit.

• Use of this equipment requires wearer training and observance of these Instructions for Use.

• Use the equipment for the purpose specified in this instruction, or as confirmed in writing by Dräger.

• Use and maintenance of this equipment requires knowledge and compliance with National Regulations, Laws and Standards governing the use of respiratory equipment in the country of use.
  Only trained competent personnel should inspect and service the equipment at regular intervals and a record kept of such inspections and service.

• Only trained and competent personnel should carry out the charging of the compressed air cylinders.

• Dräger recommends a Service Contract be obtained from your Dräger Branch or Agent.

• Contact Dräger for details of Service Contracts and Service Training Courses.

• Use only original Dräger Spare Parts for service and maintenance.

• Use only original Dräger Test Equipment for service and maintenance.

• Notify Dräger if there is a component fault or failure.

Liability Statement
Terms and Conditions of warranty for the Dräger PAS® Micro Series of equipment can be obtained from Dräger on request. Responsibility for reliable function of the equipment transfers to the owner or operator when serviced or repaired by untrained personnel, (not employed or authorised by Dräger), or when used in a manner not conforming to its intended use.

Description and Intended Use

The Dräger PAS® Micro Series of combination airline/escape equipment consists of:

• Back Carrying Harness with Cylinder Strap, Shoulder Straps and Waist belt.
• Pressure Reducer with integral Lung Demand Valve (LDV).
• Airline Manifold Connection – with or without low pressure whistle warning unit (LPWWU).
• Valved Cylinder Assembly with Contents Indicator.

The equipment is available in either 10 minute, 15 minute or 20 minute nominal escape duration versions.
This series of equipment utilises a high performance first stage pressure reducer in association with an integral lung demand valve. The equipment is compatible with a range of face mask and compressed air cylinders. When used in approved carrying system, valved cylinder assembly, LDV and face mask combinations, the equipment provides the wearer with respiratory protection when working in, or escaping from a contaminated or oxygen deficient gaseous atmosphere.
When the airline manifold coupling of the equipment is connected to a low- pressure independent air supply of breathable air quality, (e.g. Dräger AirPack System or filtered works airline), then the equipment functions as an airline working set. In this configuration the cylinder valve of the equipment is in the closed position. On failure or interruption of the independent air supply the wearer opens the cylinder valve, disconnects the independent air supply from the airline manifold connection and then proceeds to escape to a safe area using the available air supplied from the cylinder.
During escape, the effective duration of the equipment is dependant on the capacity (volume) of the cylinder selected and the breathing rate of the wearer.
Safety Warning: When the equipment is worn as an airline working set then the escape duration starts from the time of opening the cylinder valve and disconnecting the airline supply. When selecting the type and duration of escape equipment it is essential to consider the potential hazards, and probable escape routes.
Details of the equipment variants, accessories, and any approved independent air supply source configurations are available from Dräger on request.

Technical Data

High Pressure Connections
Standard G5/8 as per EN 144-2.
200 bar or 300 bar
Other connections are available to national standards.

LDV to Face mask Connection
Three variants are available:

• Push-In Type A – Positive Pressure (PP).
• Screw-In Type AE – Positive Pressure (PP).
• Screw-In Type N – Normal Demand (ND).

Refer to the Instructions for Use supplied with the face mask.

Compressed Air Cylinders
Cylinders are available in either steel, or composite materials. Contact Dräger for details.
Cylinders supplied by Dräger are charged at an ambient temperature of 15 ºC and to the nominal cylinder pressure – i.e. contents indicator needle must be aligned with the nominal charged pressure indicator, i.e. 200 or 300 bar.

Airline Manifold Connection

A Male Coupling is incorporated on the airline manifold for the connection of a hose coupling from an independent air supply.

Airline Operating Pressures and Flow
The selected low pressure independent air supply must meet the following parameters.

• One User – 6 bar to 10 bar – airflow rate of at least 550 Litres/minute.
• Two Users – 7 bar to 10 bar – airflow rate of at least 550 Litres/minute.

When using an Airline Manifold Connection – with LP whistle, the whistle activation pressure is preset by Dräger to between 5 bar and 4 bar.

Safety Warning: Air quality for compressed air breathing systems must conform to the requirements of EN12021. Do Not use oxygen or oxygen enriched air.

Preparation for Use
A trained and competent person must perform the following checks and preparation procedures before release of the equipment to a potential wearer for operational use.

Visual Inspection
Check the integrity of,

• Back Carrying Harness with Cylinder Strap, Shoulder Straps and Waist belt.
• Pressure Reducer, LDV and Hose Assemblies.
• Airline Manifold Connection and Hose – with or without LP whistle.
• Face mask – refer to the relevant Instructions for Use.
• alved Cylinder Assembly with Contents Indicator.

Fitting Cylinder

• Place the Carrying Harness on a clean flat surface. Extend the cylinder strap, shoulder straps and waist belt.
• Check the contents indicator ensuring the cylinder is fully charged, i.e. contents indicator needle must be aligned with the nominal charged pressure indicator, i.e. 200 or 300 bar.
• Refer to Fig. 1. Slide the cylinder through the strap locating the valve port to the reducer hand wheel.

Caution: To prevent damage, ensure that the hand wheel of the pressure reducer remains clear of the cylinder.

• Align the cylinder centrally with the Carrying Harness and then screw the hand wheel of the pressure reducer (clockwise) to the port of the valve. Do Not tighten.
• Take up the slack on the cylinder strap to tighten around the cylinder and then pull the strap through the buckle to secure. Insert loose end of strap into the guide loop. Finally tighten the hand wheel – hand tight. Do Not use tools.

Important Note: The following test will verify the integrity of the complete assembly. The pressure leak test described should also be carried out following the reassembly of any of the component parts of the pneumatic assembly (spares etc).

Pressure Leak Test

• Again check the contents indicator ensuring the cylinder is fully charged, i.e. contents indicator needle must be aligned with the nominal charged pressure indicator, i.e. 200 or 300 bar.
• Type A and AE – Press the reset button of the LDV to switch ‘Off’ positive pressure.
• ‘Open’ the cylinder valve slowly, but fully, to pressurise the system then ‘Close’ the valve.

Test Parameters – Check for no audible leak. If necessary, use soap and water based solution to locate a suspected leak.
Passed Test – Fold the rubber cover from the front of LDV and press the centre of the diaphragm to vent pressure from the system. Refit the rubber cover.
Type A and AE – Press the reset button of the LDV to switch ‘Off’ positive pressure.
Failed Test – Fold the rubber cover from the front of LDV and press the centre of the diaphragm to vent pressure from the system. Refit the rubber cover. Investigate the source of the leak, rectify and repeat the test. Until the leak is rectified Do Not release the equipment for use.

Leak Test and LP Flow Test – Airline Connection
Refer to Technical Data.

Important Note: If using a works airline to perform the following tests, then connect the isolation valve (3353449) to the female coupling of the airline outlet.

• Connect the male coupling (1) Fig. 3 to the female QRC of the independent air supply.
• Type A and AE – Press the reset button of the LDV to switch ‘Off’ positive pressure.
• ‘Open’ the valve of the independent air supply to pressurise the system.

Test Parameter – Check for no audible leak.

• ‘Open’ the cylinder valve of the breathing equipment to pressurise the system, then disconnect the male coupling (1) Fig. 3 from the female QRC of the hose from the independent air supply.

Test Parameter – Non-return valve check – Check for no audible leak from the female QRC.

• ‘Close’ the cylinder valve of the breathing equipment, then re-connect the male coupling (1) Fig. 3 to the female QRC of the independent air supply.
• Fold the rubber cover from the front of LDV and press the centre of the diaphragm to activate the airflow from the LDV. See Safety Warning. Refit the rubber cover.

Safety Warning: Do Not direct the airflow onto the face, eyes or skin.
Test Parameters – An unobstructed airflow should vent from the outlet of the LDV. This test should take a minimum of 3 seconds.

• ‘Close’ the valve of the independent air supply and observe the LP gauge, or the HP gauge, if fitted.

Test Parameters

• LP Gauge – Indicated pressure should not decrease more than 1 bar in 1 minute.
• HP Gauge – Indicated pressure should not decrease more than 10 bar in 1 minute.

Note: If fitted wth LPWWU, proceed to test the LPWWU. See the following section. If not fitted, proceed as follows:

• Disconnect the male coupling (1) Fig. 3 from the female QRC of the independent air supply. Fold the rubber cover from the front of LDV and press the centre of the diaphragm to vent pressure from the system. Refit the rubber cover.
  Type A and AE – Press the reset button of the LDV to switch ‘Off’ positive pressure.

LPWWU Test – if fitted

• Check that the valve of the independent air supply is ‘Closed’.

• Type A and AE – Fold the rubber cover from the front of LDV. Cover and seal the outlet of the LDV with the ball of the hand then press the centre of the diaphragm. Lift the hand to slowly vent pressure. Refit the rubber cover.
  Type N – Fold the rubber cover from the front of LDV and press the centre of the diaphragm to vent pressure from the system. Refit the rubber cover.

• Observe the LP gauge during venting.

Test Parameters – the whistle should sound between 5.0 bar and 4.0 bar.

• Should the whistle not sound at the preset pressure, refer to Dräger Service.

Note: If the selected independent air supply incorporates a HPWWU then the HP whistle will sound first.

• Following venting of the whistle, disconnect the female coupling of the hose from the independent air supply.
• Fold the rubber cover from the front of LDV and press the centre of the diaphragm to vent pressure from the system. Refit the rubber cover.

Fitting LDV to Face mask

• Inspect the face mask as defined in the relevant Instructions for Use.
• Fully extend (open) the straps of the head harness.

Type A

• Check that the face mask port and the connector O ring of the LDV are clean and undamaged.
• Push the connector of the LDV into the port of the face mask until it ‘clicks’ in position.
• Check that the attachment is secure by pulling the LDV away from the face mask – there should be no axial movement.

Types AE and N

• Check that the face mask port and sealing ring are clean and undamaged.
• Screw the hand wheel of the LDV into the port of the face mask and align the LDV as shown in Fig. 2 then finally tighten.
• Having ‘passed’ the test, and the LDV fitted to the face mask, the equipment is now available for use.

Use

Safety Warning: Before using the airline manifold connection to the equipment, ‘check’ that the independent air supply to be used complies with air quality, pressure and flow requirements (see Technical Data) and that a ‘Permit for Use’ has been issued. The respirable breathable air supply source connection to the wearer must be located in, or positioned in a safe and uncontaminated area. Dräger recommend that a ‘Controller’ must be present at all times at the air source connection to monitor and maintain the air supply to the wearer of the Dräger PAS® Micro Series Airline equipment.

Putting on equipment

• Check the contents indicator ensuring the cylinder is fully charged, i.e. contents indicator needle must be aligned with the nominal charged pressure indicator, i.e. 200 or 300 bar.
• Type A and AE – Press the reset button of the LDV to switch ‘Off’ positive pressure.
• Extend the shoulder straps. Open the buckle of the waist belt and extend the straps.
• While supporting the face mask, put on the equipment taking the weight on the shoulders by pulling evenly on the shoulder adjusting straps. Put the neck strap of the face mask over the neck then insert the neck strap stud into the hole in the centre strap of the head harness. The face mask is now in the ready position.
• Loop the waist belt around the waist and fasten the buckle. Pull the ends of the waist belt strap until secure and comfortable. Do Not overtighten. Make any final adjustment necessary to the shoulder adjusting straps. Figure 3 shows the correct wearing position.
• Type A and AE – Press the reset button of the LDV to switch ‘Off’ positive pressure.

Pre Operational Checks

The Controller
‘Close’ any relief valves that may be fitted to the independent air supply and then slowly, but fully, ‘Open’ the valve of the independent air supply to pressurize the system.

The Wearer

• Type A and AE – Press the reset button of the LDV to switch ‘Off’ positive pressure mechanism.
• Connect the male coupling (1) Fig. 3 to the female QRC of the supply hose of the independent air supply.

Safety Warning: Facial hair, beard stubble, side-whiskers, and the wearing of spectacles will adversely affect and interfere with face mask seal. Correct fit of face mask only ensured if face mask seal makes close contact with skin.

• Detach the neck strap stud from the centre strap of the head harness.
• Spread the head harness (Fig. 4), place chin into the face mask then position the harness over the head, locating the centre plate with the back of the head.
• Tighten both lower (1), then upper straps (2) evenly towards back of head. Fig. 5. Tighten the centre strap (3) only if necessary.
• On achieving a face seal and on taking first breath inhalation the Type P and PE LDVs will automatically switch to positive pressure starting the air supply to the face mask.
• Breathe normally, and before use perform Function Check.

Function Check

The Controller

• ‘Close’ the valve of the independent air supply.

The Wearer

• Breathe normally to vent air from the system. During venting the whistle (if fitted) will alarm at the preset pressure. When fully vented, hold breath. The face mask should hold onto the face indicating a positive seal.
• Immediately indicate to the ‘Controller’ of a positive face seal and request to immediately ‘open’ the valve of the independent air supply.

The Controller

• When ‘Wearer’ indicates to the ‘Controller’ of a positive face seal – the ‘Controller’ should immediately ‘Open’ the valve of the independent air supply to pressurise system.

The Wearer – In Use

• Inhale and hold breath. Unit must balance, i.e. no audible leak.
• Continue breathing normally. The expired air should flow easily out of the exhalation valve.
• Continue breathing normally and proceed to the working area.

The Wearer – Evacuation

• Breathe normally.
• When the task is completed, or when advised by the ‘Controller’ -proceed to the safe area (Controller). During evacuation take care to hold and carefully withdraw the airline supply hose. See After Use.

IN AN EMERGENCY

• ‘Open’ the cylinder valve of the equipment (anticlockwise) slowly, but fully. Breathe normally.
• Disconnect the male coupling (1) Fig. 3 from the female QRC of the hose from the independent air supply. Breathe normally and immediately leave the hazardous area by the shortest and safest escape route.

Safety Warning: The escape duration starts from the time of opening the cylinder valve and disconnecting the independent air supply. Dräger strongly advise that the supplementary supply facility is not used.

After Use
Safety Warning: Do Not remove equipment until in safe area, clear of hazard.

Airline Mode – The Wearer

• Release the side straps of the head harness.
• Type A and AE – Press the reset button of the LDV to switch ‘Off’ positive pressure then remove the face mask.

Airline Mode – The Controller

• Following removal of the face mask by the wearer, ‘Close’ the valve of the independent air supply.

Airline Mode – The Wearer

• Fold the rubber cover from the front of LDV and press the centre of the diaphragm to vent pressure from the system. Refit the rubber cover.

Safety Warning: Do Not direct the airflow onto the face, eyes or skin.

• Following venting, disconnect the male coupling (1) Fig. 3 from the female QRC of the hose from the independent air supply.

Airline Mode – The Controller

• Refer to the After Use section of the Instructions for Use relevant to the independent air supply

11.5 Escape Mode

• Release the side straps of the head harness.
• Remove the face mask then ‘Close’ the cylinder valve.
• Type A and AE – The system will vent from the lung demand valve. Type N – Fold the rubber cover from the front of LDV and press the centre of the diaphragm to vent pressure from the system. Refit the rubber cover.

Airline Mode and Escape Mode

• Following venting of the equipment, unbuckle the waist belt, lift the buckles of the shoulder straps to loosen the harness then remove the equipment.

Note: Do Not drop or throw down equipment as damage could occur.

• Type A and AE – Press the reset button of the LDV to switch ‘Off’ positive pressure.
• Pass equipment to Service Department.

Routine Maintenance

To be performed after use of equipment.
See also Maintenance and Test Intervals Chart.

Removal of Cylinder
Safety Warning: Cylinder valve should be closed and system vented.

• Loosen the cylinder strap from the buckle. Unscrew the hand wheel of the reducer from the cylinder valve and carefully remove the cylinder from the equipment. To prevent damage, ensure that the hand wheel of the pressure reducer remains clear of the cylinder.
• Recharge the cylinder.

Charging Cylinders
Refer to ‘For Your Safety’

Safety Warning: Air quality for compressed air breathing systems must conform to the requirements of EN12021.
Only charge compressed air cylinders which:

• Conform to National Standards.
• Feature the original manufacturers test date and test mark.
• Have not exceeded the test date indicated on the cylinder by the last testing station.
• Do Not used damaged cylinders.

Recharge to the rated pressure indicated on the label or stamped on the neck or shoulder of cylinder. Dräger recommend a charge rate of 27 bar/minute. Rapid charging will induce an increase in temperature resulting in an incomplete charge – check pressure at ambient and if required ‘Top Up’ charge.
To prevent overcharging of the selected cylinder Dräger recommend that a pressure-limiting device is fitted to the charging compressor.

Visual Inspection
Check the integrity of,

• Back Carrying Harness with Cylinder Strap, Shoulder Straps and Waist belt.
• Pressure Reducer with integral Lung Demand Valve (LDV).
• LDV – refer to the relevant Instructions for Use.
• Airline Manifold Connection and Hose – with or without LP whistle.
• Face mask – refer to the relevant Instructions for Use.
• Valved Cylinder Assembly with Contents Indicator.
• Damaged cylinders must not be used.

Cleaning, Disinfecting, Drying

Safety note: Do not exceed 60 °C for drying, and remove components from the drying facility immediately when dry. Drying time in a heated dryer must not exceed 30 minutes.
Safety note: Do not immerse pneumatic or electronic components in cleaning solutions or water.
Safety note: If water is trapped and then freezes inside the pneumatic system of the breathing apparatus (such as the lung demand valve), operation will be impaired. Prevent any liquid from entering, and thoroughly dry the breathing apparatus after cleaning to prevent this from occurring.

For information about suitable cleaning and disinfecting agents and their specifications refer to document 9100081 on www.draeger.com/IFU.
Refer also to the Instructions for Use for the lung demand valve, face mask and other associated equipment.

• Use only clean lint-free cloths
• Clean the breathing apparatus manually using a cloth moistened with cleaning solution to remove excess dirt.
• Apply disinfecting solution to all internal and external surfaces.
• Rinse all components thoroughly with clean water to remove all cleaning and disinfecting agents.
• Dry all components using a dry cloth, in a heated dryer or in air.
• Contact service personnel or Dräger if disassembly of pneumatic or electronic components is required.

Lung Demand Valve (LDV)
External cleaning of the LDV may be carried out as required using a cloth dampened in the above cleaning solution.
Important Note: When cleaning using a dampened cloth, take care to prevent any fluid residue entering the demand valve.
When however the user considers it necessary to internally disinfect the LDV then this variant of the Dräger PAS® Micro Series of equipment requires the demand valves (integral LDV) to be removed from the manifold of the airline manifold connection to the reducer. For details of removal refer to the following section.

Integral LDV
Refer To Figure 6.

• Roll back the rubber sleeve (1) to access the retention staple (2). Insert a flat blade screwdriver under the retention staple and while pressing the end of the hose into the hose connection of the reducer – remove the retention staple. Remove hose from the airline manifold.
• Remove component parts of the relief valve, i.e. the spring, O ring retainer and O ring from the nozzle of the medium pressure hose. If required, remove the LDV from the front port of the face mask.

Important Note: Cleaning, disinfecting and drying of the LDV must be carried out in line with the Instructions for Use. Refer to the LDV Instructions for Use supplied with the equipment.

• Reverse the above instructions to reassemble the LDV to the equipment and perform Pre Operational Checks as detailed in the Instructions for Use for the equipment.

Replacing Diaphragm of the LDV
Refer also to the LDV Instructions for Use provided with the equipment.

Face mask
Refer to Instructions for Use provided with Face mask.

Testing Equipment and Test Intervals
In addition to work outlined in Routine Maintenance it is important to comply with the following test and test intervals. This instruction applies to non- used in storage ‘Ready for Use’ equipment. Refer also to the appropriate Service Training Manual. Contact Dräger for details of Service Training Courses or Service Contracts.

Daily
Check the contents indicator ensuring the cylinder is fully charged, i.e. contents indicator needle must be aligned with the nominal charged pressure indicator, i.e. 200 or 300 bar.

Storage

Storage preparation

• Extend the shoulder straps, waist belt and the straps of the face mask.
• For storage, place the face mask in a protective bag (contact Dräger for supply of a suitable bag).
• Route rubber hoses in such a way that the bend radius is not too acute and the hose is not stretched, compressed or twisted.

Storage conditions

• Store the equipment between -15 °C and +25 °C. Ensure that the environment is dry, free from dust and dirt, and does not subject the equipment to wear or damage due to abrasion. Do not store the equipment in direct sunlight.
• Fix the breathing apparatus securely to any raised mounting point to prevent it from falling.

Fault, Cause, Remedy

Refer to any associated Instructions for Use supplied with this product, e.g. face mask.

replace seals as necessary
Leak from pressure relief valve of

MP hose

|

• Damaged O-ring
• Weak Spring
• Damaged O-ring retainer

| Replace O-ring Replace spring Replace retainer
Leak from pressure relief valve of MP hose Relief valve component satisfactory| Reducer failure| Contact Dräger Service
High or Low medium pressure| Reducer out of specification| Contact Dräger Service
Poor sounding whistle (if fitted)| Dirt| Clean and retest
Whistle not functioning correctly| Defective activation mechanism| Contact Dräger Service

Miscellaneous

Maintenance and Test Intervals

Service and test the breathing apparatus, including out-of-use apparatus, in accordance with the maintenance table. Record all service details and testing. Refer also to the Instructions for Use for the lung demand valve, face mask and other associated equipment.
Additional inspection and testing may be required in the country of use to ensure compliance with national regulations.

| Description| Before Use| After Use| Every Month| Every Year| Every 6 Years
---|---|---|---|---|---|---
Complete Equipment| Visual inspection (see Note 1)| | | | |
Functional testing| | | | |
Breathing cycle and static tests (see Note 2)| | | | |
Demand Valve| Check push-in type connectors for lubricant (see Note 3)| | | | |
Pressure Reducer| Medium-pressure check (see Note 2)| | | | |
Inspect the sintered filter (see Note 2 and Note 4)| | | | |
Inspect the high-pressure connector O-ring (see Note 2 and Note 5)| | | | |
Overhaul. Contact Dräger for the Repair Exchange (REX) service (see Note 6)| | | | |
Cylinder| Charge cylinder to correct working pressure| | | | |
Check charged pressure (stored cylinders only)| | | | |
Check test date of cylinder| | | | |
Recertification| According to national regulations in the country of use
Cylinder Valve| Overhaul| At the time of cylinder recertification

Dräger recommendations

1. Clean the equipment if it is dirty. If it the equipment has been exposed to contaminants, disinfect any components that come into direct and prolonged contact with the skin.
2. These maintenance tasks may only be carried out by Dräger or trained service personnel. Details of the tests are contained in the Technical Manual which is issued to service personnel that have attended a relevant Dräger maintenance course.
3. For type A check the O-ring on the lung demand valve; and for type ESA check the outer surface of the male part of the push-in connector on the lung demand valve. As a guide, lubricant should be felt on the fingers but not seen. If relubrication is required, lightly apply Dow Corning® Molykote® 111 (other lubricants are not tested and may damage the equipment).
4. Replace the sintered filter if a drop in reducer performance is observed during a flow check or if it is visibly damaged.
5. Replace the high-pressure connector O-ring if it is found to leak during functional testing or if the O-ring is visibly damaged.
6. Where the breathing apparatus is subjected to a high level of use (in training establishments etc.), reduce the overhaul period for the pressure reducer. In these circumstances, Dräger recommend that the overhaul frequency should be less than 5,000 applications of use. An application of use is defined as a single use of the fully assembled breathing apparatus, where the user breathes from the air cylinder. It does not include system pressurization for pre-operational checks.

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