ST53 Plus

The Avon ST53 Plus SCBA is a new product offering built from the revolutionary, field proven ST53™ multi-role Respiratory Equipment (RPE) system platform. It was developed specifically for specialist applications where the user needs to respond to ever changing operational conditions and incorporates the latest Avon fire hardened FM54 Air Purifying Respirator (APR).

The ST53 Plus SCBA combines the latest technological advancements of the FM54 APR providing Specialist Operators maximum level of protection to face, eyes and respiratory tract from Chemical, Biological, Radiological and Nuclear (CBRN), Riot Agents, Toxic Industrial Chemicals and Toxic Industrial Materials while maintaining extreme user flexibility as mission profiles change.

The ST53 Plus SCBA and new FM54 mask affords the user the ability to seamlessly switch from negative to positive pressure offering the operator with total flexibility to select the necessary level of protection quickly and efficiently while continuing to operate effectively.

For further information please download the ST53 Plus Datasheet.

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Compact Demand Valve (CDV)

1st breath activated for "instant on"
Rugged, compact design delivers high flow rates
Screw-on-design allows for DIN 40 thread

Gauge & Whistle

Located on shoulder straps for easy access
Positioned for high noise environments and easy gauge reading
Illuminated gauge for low-light situations

Stealth Appearance

Black low profile design
Lightweight compared to traditional SCBA units
Silent operation for critical missions

Comfort

Ergonomically contoured backframe for comfort
Adjustable harness allows for quick donning/ doffing
Padded shoulder straps for comfort

Technical Data
Breathing Performance in SCBA mode
Breathing Rate	103 liters per minute with mask pressure above ambient
Environmental range	The operating range is -30^oC + 60^oC
End of cylinder air	Able to sustain positive pressure down to 10 bar cylinder pressure

Breathing performance in ST PAPR Mode

Breathing rate

125-165 liters per minute

Breathing performance in APR mode
Breathing resistance	Exhalation breathing resistance of no greater than 20mm of water at 85 lpm in a negative pressure mode
Inhalation resistance including General Purpose Filter	50 mm of water at 85 lpm

Live agent permeation performance (Data validated by ECBC, Edgewood Chemical Biological Center)
	Requirements		Actual		Test agent	NIOSH CBRN Requirements	Typical Performance
Challenge Chemical	Max Peak (mg/m³)	Max Cumulative (mg-min/m³)	Max Peak (mg-m³)	Max Cumulative (mg-min/m³)	Test agent	NIOSH CBRN Requirements	Typical Performance
Sarin (GB)	0.6	6	0.004	0.203	Mustard (HD)	6 Hours	> 6 Hours
Mustard (HD)	0.087	6	0.005	0.8	Sarin (GB)	6 Hours	> 6 Hours

Materials used
Harness on ST53 SCBA	Kevlar webbing with stainless steel nylon hardware
Harness on ST53SD SCBA	Nylon Cordura
Backplate	Glass reinforced polycarbonate
Cylinder valve	Anodized Aluminum
ST-PAPR	GE Noryl with a 10% glass fill

Weight for ST53 units (based on empty cylinders)		Weight for ST53 Plus units (based on empty cylinders)
ST53 (excluding cylinder and mask)	6.6 lbs	ST53SD 11 cu. ft (includes cylinder but no mask)	5.2 lbs
Carbon fiber fully wrapped, 2216 psi, 30 minute	7.75 lbs
Carbon fiber fully wrapped, 4500 psi, 30 minute	7.4 lbs
Carbon fiber fully wrapped, 4500 psi, 45 minute	9.9 lbs	ST53SD 17 cu. ft (includes cylinder but no mask)	4.0 lbs
Carbon fiber fully wrapped, 4500 psi, 60 minute	11.95 lbs

Weight for ST-PAPR		Weight for mask only
ST-PAPR without CDV, battery or cartridges	2.5 lbs	Single Port FM53 mask (excluding filter)	1.2 lbs
ST-PAPR without CDV, two general purpose filters and a lithium Sulphur Dioxide battery	4.4 lbs	Dual Port FM53 mask (excluding filter)	1.3 lbs

Approvals

Type-examination approval: PPE Regulation 2016/424/EU - Module B: Certificate CE 684849
The Avon ST53 Plus SCBA carries a NIOSH Industrial Approval under the provisions of 42 CFR 84 TC-13F in a variety of cylinder and facepiece size combinations.