Scope
ISO 11820:2019
In-Situ Sound Attenuation Measurement of Silencers
ISO 11820 specifies the in-situ measurement method for determining the acoustic attenuation performance of silencers installed in railway ventilation ducts, brake systems, and exhaust lines. This test is critical for validating noise control equipment on operating trains and stationary installations where laboratory testing is impractical. Railway manufacturers, maintenance operators, and acoustic engineers use these measurements to verify compliance with noise regulations and to optimize silencer design. Accreditation ensures that attenuation claims are reliable and that performance targets for noise reduction are consistently achieved in real-world applications.
What it measures
- Sound pressure level reduction across silencer (dB)
- Attenuation performance by frequency band
- Insertion loss of silencer in situ
- Acoustic performance under operating conditions
- Noise transmission loss through silencer element
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DIN EN ISO 11821
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BS EN ISO 11821
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NF EN ISO 11821
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UNI EN ISO 11821
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UNE EN ISO 11821
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NEN EN ISO 11821
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DIN EN ISO 3095
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BS EN ISO 3095
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NF EN ISO 3095
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UNI EN ISO 3095
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UNE EN ISO 3095
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NEN EN ISO 3095
1,273
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IEC 61400-11:2012/ AMD:2018
IEC 61400-12-2
IEC 61400-50-2
IEC 61400-12-1
IEC 61400-12-3
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BIOTECNAL
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UNE-EN ISO 6579-1
UNE-EN ISO 6222
UNE-EN 26777
UNE-EN ISO 7027-1
en 31-7-79 (BOE 29-08-79)
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UNE-EN 13284-2
UNE-EN 15259
UNE-EN 16911-2
UNE-EN 13284-1
UNE EN 1911
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CALTECNICA INGENIEROS
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(3 ± 0,5) 10-2 mol/mol (5 ± 0,5) 10-
(5 ± 0,5) 10-2 mol/mol
- 80 ˚C a 200 ˚C
- 20 ˚C a < 23 ˚C 23 ˚C a 40 ˚C > 40 ˚C
- 20 ˚C a 60 ˚C
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CANAGROSA LAB&SERVICES
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ISO 2808
ISO 48-4
UNE-EN ISO 2808
ISO 2409
UNE-EN ISO 2360
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(0,15 ± 0,02) · 10-2 mol/mol (0,50 ± 0,0
(6,0 ± 1,0) · 10-2 mol/mol (11,5 ± 2,0)
(10 ± 2) · 10-6 mol/mol (50 ± 8) · 10-6
(0,15 ± 0,02) · 10-2 mol/mol (0,30 ± 0,0
1,000 ± 0,100
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DIN EN 13260
DIN EN 13261
DIN EN 13262
Railway end stop systems (EN 14752)
Railway vehicle body structural requirem
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UNE-EN 60567
IEC 60814
UNE-EN 61198
IEC 60247
UNE-EN 61619
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OM H-3 based on ISO 9698:2019
ISO 13164-4
SM 3111
UNE-EN ISO 13160
ISO 10704
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UNE-EN ISO 5667-19
UNE-EN ISO 16665
UNE-EN 19493
SM 2510 B
SM 4500 H+
UNE 7027-1
UNE 7887
SM 4500-NO B 2
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UNE-EN 136
UNE-EN 148-1
UNE-EN 140
UNE-EN 149
UNE-EN 13274-7
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CIRCUTOR, S.A. (Unipersonal)
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UNE-EN 61000-4-2
UNE EN 61000-4-5
UNE-EN 55016-2-1
UNE-EN 61000-4-11
UNE-EN 61000-4-8
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ID179
Pt 500
Railway brake disc acoustic emissions (E
UNE-EN 200
CLOVER TECHNOLOGIES
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ISO/IEC 15408-3
ISO/IEC 15408-1
ISO/IEC 15408-2
ISO/IEC 15408-4
ISO/IEC 15408-5
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CEM EL-020
EURAMET cg-17
CEM EL
CEM ME-004
EURAMET cg-11
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UNE 118019
UNE 118012
ISO 22980
UNE 118020
UNE 118021-2
CONSORCI DE MEDI AMBIENT I SALUT PÚBLICA DE LA GARROTXA (SIGMA) LABORATORI POLIVALENT DE LA GARROTXA
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SM 3111 B
SM 3500-K B SM 3500-Na B
SM 2330 B
SM 3113 B
UNE-EN ISO 8467
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UNE-EN 13284-2
UNE-EN 15259
UNE-EN 13284-1
UNE ISO 9096
UNE-EN 14181 (1)
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IEC 61730-2
IEC 61215-1-2
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IEC 61215-1-4
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DIPE ELECTRÓNICA
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0 mV U < 330 mV 330 mV U < 3,3 V 3,3
0 mV U < 120 mV 120 mV U < 1,2 V 1,2
0 A I 330 A 330 A < I 3,3 mA 3,
20 A I 1025 A
20 A I 1025 A F = 50 Hz
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SM 5210 D
UNE-EN ISO 27888
SM 5220 D
SM 2130 B
UNE-EN ISO 11885
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50 ∙ 10-9 mol/mol ≤ C ≤ 237 · 10-9 mol/m
30∙ 10-9 mol/mol ≤ C ≤ 500 ∙ 10-9 mol/mo
50 ∙ 10-9 mol/mol ≤ C ≤ 1000 · 10-9 mol/
50 ∙ 10-9 mol/mol ≤ C ≤ 237∙ 10-9 mol/mo
0,5 ∙ 10-9 mol/mol ≤ C ≤ 15 ∙ 10-9 mol/m
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