1、BSI Standards PublicationBS ISO 16900-11:2013Respiratory protective devices Methods of test and testequipmentPart 11: Determination of field of visionBS ISO 16900-11:2013 BRITISH STANDARDNational forewordThis British Standard is the UK implementation of ISO16900-11:2013.The UK participation in its p
2、reparation was entrusted to TechnicalCommittee PH/4, Respiratory protection.A list of organizations represented on this committee can beobtained on request to its secretary.This publication does not purport to include all the necessaryprovisions of a contract. Users are responsible for its correctap
3、plication. The British Standards Institution 2013. Published by BSI StandardsLimited 2013ISBN 978 0 580 70760 5ICS 13.340.30Compliance with a British Standard cannot confer immunity fromlegal obligations.This British Standard was published under the authority of theStandards Policy and Strategy Comm
4、ittee on 31 October 2013.Amendments issued since publicationDate Text affectedBS ISO 16900-11:2013 ISO 2013Respiratory protective devices Methods of test and test equipment Part 11: Determination of field of visionAppareils de protection respiratoire Mthodes dessai et quipement dessai Partie 11: Dte
5、rmination du champ de visionINTERNATIONAL STANDARDISO16900-11First edition2013-10-15Reference numberISO 16900-11:2013(E)BS ISO 16900-11:2013ISO 16900-11:2013(E)ii ISO 2013 All rights reservedCOPYRIGHT PROTECTED DOCUMENT ISO 2013All rights reserved. Unless otherwise specified, no part of this publica
6、tion may be reproduced or utilized otherwise in any form or by any means, electronic or mechanical, including photocopying, or posting on the internet or an intranet, without prior written permission. Permission can be requested from either ISO at the address below or ISOs member body in the country
7、 of the requester.ISO copyright officeCase postale 56 CH-1211 Geneva 20Tel. + 41 22 749 01 11Fax + 41 22 749 09 47E-mail copyrightiso.orgWeb www.iso.orgPublished in SwitzerlandBS ISO 16900-11:2013ISO 16900-11:2013(E) ISO 2013 All rights reserved iiiContents PageForeword ivIntroduction v1 Scope . 12
8、Normative references 13 Terms and definitions . 14 Prerequisites 15 General test requirements . 26 Principle 27 Apparatus . 28 Device preparation . 28.1 Mounting the device . 28.2 Mapping the field of vision . 38.3 Calculating the Visual Field Score (VFS) . 39 Test report . 6Annex A (normative) Appl
9、ication of uncertainty of measurement 7Annex B (normative) Headforms for determining the field of vision 9Bibliography .11BS ISO 16900-11:2013ISO 16900-11:2013(E)ForewordISO (the International Organization for Standardization) is a worldwide federation of national standards bodies (ISO member bodies
10、). The work of preparing International Standards is normally carried out through ISO technical committees. Each member body interested in a subject for which a technical committee has been established has the right to be represented on that committee. International organizations, governmental and no
11、n-governmental, in liaison with ISO, also take part in the work. ISO collaborates closely with the International Electrotechnical Commission (IEC) on all matters of electrotechnical standardization.The procedures used to develop this document and those intended for its further maintenance are descri
12、bed in the ISO/IEC Directives, Part 1. In particular the different approval criteria needed for the different types of ISO documents should be noted. This document was drafted in accordance with the editorial rules of the ISO/IEC Directives, Part 2. www.iso.org/directivesAttention is drawn to the po
13、ssibility that some of the elements of this document may be the subject of patent rights. ISO shall not be held responsible for identifying any or all such patent rights. Details of any patent rights identified during the development of the document will be in the Introduction and/or on the ISO list
14、 of patent declarations received. www.iso.org/patentsAny trade name used in this document is information given for the convenience of users and does not constitute an endorsement.The committee responsible for this document is ISO/TC 94, Personal safety - Protective clothing and equipment, Subcommitt
15、ee SC 15, Respiratory protective devices.ISO 16900 consists of the following parts, under the general title Respiratory protective devices Methods of test and test equipment: Part 1: Determination of inward leakage Part 2: Determination of breathing resistance Part 3: Determination of particle filte
16、r penetration Part 4: Determination of gas filter capacity and migration, desorption and carbon monoxide dynamic testing Part 11: Determination of field of visionThe following parts are under preparation: Part 5: Breathing machine/metabolic simulator/RPD headforms/torso, tools and transfer standards
17、 Part 6: Mechanical resistance Strength of components Part 7: Practical performance test method Part 8: Measurement of RPD air flow rates Part 9: Determination of the carbon dioxide content of inhaled air Part 10: Resistance to ignition, flame, radiant heat and heat Part 12: Determination of volume
18、averaged work of breathing and peak respiratory pressures Part 13: RPD using regenerated breathable gas and special application mining escape RPD: Consolidated test for gas concentration, temperature, humidity, work of breathing, breathing resistance and durationiv ISO 2013 All rights reservedBS ISO
19、 16900-11:2013ISO 16900-11:2013(E)IntroductionThis part of ISO 16900 is intended as a supplement to the respiratory protective devices (RPD) performance standard ISO 17420 (all parts). Test methods are specified for complete devices or parts of devices that are intended to comply with ISO 17420. If
20、deviations from the test method given in this part of ISO 16900 are necessary, these deviations will be specified in ISO 17420. ISO 2013 All rights reserved vBS ISO 16900-11:2013BS ISO 16900-11:2013Respiratory protective devices Methods of test and test equipment Part 11: Determination of field of v
21、ision1 ScopeThis part of ISO 16900 specifies the laboratory test method for determining the field of vision for a respiratory protective device (RPD).2 Normative referencesThe following documents, in whole or in part, are normatively referenced in this document and are indispensable for its applicat
22、ion. For dated references, only the edition cited applies. For undated references, the latest edition of the referenced document (including any amendments) applies.ISO 16972, Respiratory protective devices Terms, definitions, graphical symbols and units of measurementISO 17420-3, Respiratory protect
23、ive devices Performance requirements Part 3: Thread connection3 Terms and definitionsFor the purposes of this document, the terms and definitions given in ISO 16972 and the following apply.3.1apertometerextended hemispherical dome for measuring the angular area of the field of vision (peripheral iso
24、pter) of an RPD when mounted on a headform3.2peripheral isopterfield of vision while wearing an RPD, indicated by the lighted area, which is measured by a solid line connecting the points3.3visual field scoreVFSsummation of grid points contained within the peripheral isopter shadow cast onto the ape
25、rtometer by the RPD4 PrerequisitesThe performance standard shall indicate the conditions of the test. This includes the following:a) number of specimens;b) any preconditioning;c) use of filter simulator, if applicable;d) any accessories;INTERNATIONAL STANDARD ISO 16900-11:2013(E) ISO 2013 All rights
26、 reserved 1BS ISO 16900-11:2013ISO 16900-11:2013(E)e) appropriate size(s) of headforms to be used.5 General test requirementsUnless otherwise specified, the values stated in this part of ISO 16900 are expressed as nominal values. Except for temperature limits, values which are not stated as maxima o
27、r minima shall be subject to a tolerance of 5 %. Unless otherwise specified, the ambient conditions for testing shall be between 16 C and 32 C and (50 30) % relative humidity. Any temperature limits specified shall be subject to an accuracy of 1 C.6 PrincipleThis test quantifies the field of vision
28、of a respiratory protective device (RPD) by measuring the functional visual field score. The RPD is mounted on a headform containing small light sources instead of eyes. The light from the light sources is projected onto the apertometer, creating a light area outlined by a shadow that follows the pe
29、riphery of the visual obstruction of the RPD system. The light area represents the visual field, or peripheral isopter. A quantitative value for the visual field score is obtained by comparing the peripheral isopter with a visual field score defined for different segments of the unrestricted field o
30、f vision.7 ApparatusThe following apparatus are used for determining the visual field score.a) Headforms: see Annex B.b) Apertometer: see Figure 1.c) Visual field score plotting chart: See Figure 2.8 Device preparationPrepare the RPD to the ready for use condition in accordance with the manufacturer
31、s instructions for use. This involves attaching any accessories that may obscure vision, such as demand valve or filter(s), or filter simulator (ISO 16900-5) for devices containing the thread connection in accordance with ISO 17420-3. The headform size(s) appropriate to the size of RPD being tested
32、shall be selected for the test.8.1 Mounting the deviceMount the RPD on the selected headform in accordance with the manufacturers donning instructions. Position the RPD symmetrically on the headform. If the RPD has wearer-adjustable head harness straps, tighten the straps to the extent that would be
33、 expected when wearing the device as specified by the manufacturer.NOTE If necessary, apply a friction reducing material talcum powder to the headform to allow the RPD to slide more easily over the headform surface during adjustment.Position the headform correctly within the apertometer (see Figure
34、1).The headform is positioned correctly when the centre of the light source of the illuminated eyes are aligned with the 90 degree meridians on the dome, symmetrically about the centre line of the dome and the horizontal axis of the headform is coincident with the axis of the apertometer.2 ISO 2013
35、All rights reservedBS ISO 16900-11:2013ISO 16900-11:2013(E)Dimensions in millimetresFigure 1 Position of headform in apertometerSwitch on both illuminated eyes and re-adjust the RPD position on the headform so that the shadow on the apertometer is symmetrical about the vertical centre line such that
36、 the point at which the shadow crosses the horizontal centre line on the left and right sides is within 5 degrees of each other.The RPD shall not be donned on the headform in an inappropriate position in an attempt to maximize the visual field score.NOTE In the case of RPD with an asymmetric Respira
37、tory Interface design or assembly, this is not possible and the Respiratory Interface shall just be centralised about the vertical centre line.8.2 Mapping the field of visionUsing the visual field score plotting chart (Figure 2), transfer the outline of the light projected onto the apertometers surf
38、ace onto the chart by marking the point at which the light changes to a shadow along each of the 36 meridians within the apertometer. Once the points have been plotted along each meridian, connect the points from one meridian to the next, following the curve of the shadow on the apertometer. The sol
39、id line connecting the points represents the peripheral isopter for the RPD.Remove the RPD and re-fit to the headform for a total of three fittings.8.3 Calculating the Visual Field Score (VFS)The VFS plotting chart (Figure 2) assigns 118 dots in total. Fifty dots are assigned to the central area, up
40、 to 10 of fixation. The remaining 68 points are assigned to the area beyond 10. The grid dots are located along 10 meridians (two in each of the upper quadrants, three in each of the lower quadrants) at 25, 65, 115, 155, 195, 225, 255, 285, 315, and 345.Outside the central area the dots are distribu
41、ted along the meridians according to a weighting system that is based on an assessment of the importance of different meridians being within the visual field when wearing RPD. The four peripheral dots which lie on the 25, 155, 195 and 345 meridians are considered of critical importance and therefore
42、 called critical dots. (see Figure 2 and Table 1). ISO 2013 All rights reserved 3BS ISO 16900-11:2013ISO 16900-11:2013(E)Count the VFS grid dots that fall on or inside of the peripheral isopter for the RPD. This number is the VFS. Record the number of mandatory dots within the VFS.The centre of a do
43、t shall be within the light area to be counted.Figure 2 Visual Field Score (VFS) plotting chartThe dots within each segment represent the individual points counted to determine the VFS.4 ISO 2013 All rights reservedBS ISO 16900-11:2013ISO 16900-11:2013(E)Table 1 Results table for Visual Field Score
44、(VFS): Example shows data from one fittingMeridian ()Number of dots within peripheral Isopter outside the 10 of fixation central areaFitting 1 Fitting 2 Fitting 3 Average total VFS25 8 - -65 4 - -115 4 - -155 8 - -195 8 - -225 6 - -255 6 - -285 6 - -315 6 - -345 8 - -Add 50 dots for area inside 10 o
45、f fixation50 50 50Total VFSNumber of critical dots includedAverage number of critical dots 2? Yes/noYesAn example of a visual field score plot is shown in Figure 3 with the results for one fitting tabulated in Table 1.Figure 3 Example of VFS plot ISO 2013 All rights reserved 5BS ISO 16900-11:2013ISO
46、 16900-11:2013(E)9 Test reportThe test report shall include at least the following information:a) the number of test specimens;b) any preconditioning;c) use of filter simulator, if applicable;d) any accessories;e) headform used;f) the VFS at each meridian, the number of critical points within the sc
47、ore and average total VFS of the three fittings (table).6 ISO 2013 All rights reservedBS ISO 16900-11:2013ISO 16900-11:2013(E)Annex A (normative) Application of uncertainty of measurementA.1 Determination of complianceIn order to determine compliance or otherwise of the measurement made in accordanc
48、e with this test method, when compared to the specification limits given in the protective device standard, the following protocol shall be applied.If the test result the uncertainty of measurement, U, falls completely inside or outside of the specification zone for the particular test given in the
49、protective device standard, then the result shall be deemed to be a straightforward pass or fail (see Figures A.1 and A.2).Key1 lower specification limit2 specification zone3 upper specification limit4 uncertainty of measurement, U5 measured valueFigure A.1 Result pass ISO 2013 All rights reserved 7BS ISO 16900-11:2013ISO 16900-11:2013(E)Key1 lower specification limit2 specification zone3 upper specification limit4 uncertainty of measurement, U5 measured valueFigure A.2 R
