SIST EN ISO 16122-4:2025

SLOVENSKI STANDARD
01-november-2025
Nadomešča:
SIST EN ISO 16122-4:2015
Kmetijski in gozdarski stroji - Kontrola škropilnikov v uporabi - 4. del: Nameščeni
in polprenosni škropilniki (ISO 16122-4:2024)
Agricultural and forestry machines - Inspection of sprayers in use - Part 4: Fixed and
semi-mobile sprayers (ISO 16122-4:2024)
Land- und Forstmaschinen - Kontrolle von in Gebrauch befindlichen
Pflanzenschutzgeräten - Teil 4: Fest installierte und teilbewegliche Geräte (ISO 16122-
4:2024)
Matériel agricole et forestier - Contrôle des pulvérisateurs en service - Partie 4:
Pulvérisateurs fixes et semi-mobiles (ISO 16122-4:2024)
Ta slovenski standard je istoveten z: EN ISO 16122-4:2025
ICS:
65.060.40 Oprema za nego rastlin Plant care equipment
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

EN ISO 16122-4
EUROPEAN STANDARD
NORME EUROPÉENNE
October 2025
EUROPÄISCHE NORM
ICS 65.060.40 Supersedes EN ISO 16122-4:2015
English Version
Agricultural and forestry machines - Inspection of sprayers
in use - Part 4: Fixed and semi-mobile sprayers (ISO
16122-4:2024)
Matériel agricole et forestier - Contrôle des Land- und Forstmaschinen - Kontrolle von in Gebrauch
pulvérisateurs en service - Partie 4: Pulvérisateurs befindlichen Pflanzenschutzgeräten - Teil 4: Fest
fixes et semi-mobiles (ISO 16122-4:2024) installierte und teilbewegliche Geräte (ISO 16122-
4:2024)
This European Standard was approved by CEN on 29 December 2024.

CEN members are bound to comply with the CEN/CENELEC Internal Regulations which stipulate the conditions for giving this
European Standard the status of a national standard without any alteration. Up-to-date lists and bibliographical references
concerning such national standards may be obtained on application to the CEN-CENELEC Management Centre or to any CEN
member.
This European Standard exists in three official versions (English, French, German). A version in any other language made by
translation under the responsibility of a CEN member into its own language and notified to the CEN-CENELEC Management
Centre has the same status as the official versions.

CEN members are the national standards bodies of Austria, Belgium, Bulgaria, Croatia, Cyprus, Czech Republic, Denmark, Estonia,
Finland, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway,
Poland, Portugal, Republic of North Macedonia, Romania, Serbia, Slovakia, Slovenia, Spain, Sweden, Switzerland, Türkiye and
United Kingdom.
EUROPEAN COMMITTEE FOR STANDARDIZATION
COMITÉ EUROPÉEN DE NORMALISATION

EUROPÄISCHES KOMITEE FÜR NORMUNG

CEN-CENELEC Management Centre: Rue de la Science 23, B-1040 Brussels
© 2025 CEN All rights of exploitation in any form and by any means reserved Ref. No. EN ISO 16122-4:2025 E
worldwide for CEN national Members.

Contents Page
European foreword . 3
Annex ZA (informative) Relationship between this European Standard and the essential
health and safety and environmental requirements of Directive 2009/128/EC . 4

European foreword
This document (EN ISO 16122-4:2025) has been prepared by Technical Committee ISO/TC 23 "Tractors
and machinery for agriculture and forestry" in collaboration with Technical Committee CEN/TC 144
“Tractors and machinery for agriculture and forestry” the secretariat of which is held by AFNOR.
This European Standard shall be given the status of a national standard, either by publication of an
identical text or by endorsement, at the latest by April 2026, and conflicting national standards shall be
withdrawn at the latest by April 2026.
Attention is drawn to the possibility that some of the elements of this document may be the subject of
patent rights. CEN shall not be held responsible for identifying any or all such patent rights.
This document supersedes EN ISO 16122-4:2015.
This document has been prepared under a standardization request addressed to CEN by the European
Commission. The Standing Committee of the EFTA States subsequently approves these requests for its
Member States.
For the relationship with EU Legislation, see informative Annex ZA, which is an integral part of this
document.
Any feedback and questions on this document should be directed to the users’ national standards
body/national committee. A complete listing of these bodies can be found on the CEN website.
According to the CEN-CENELEC Internal Regulations, the national standards organizations of the
following countries are bound to implement this European Standard: Austria, Belgium, Bulgaria,
Croatia, Cyprus, Czech Republic, Denmark, Estonia, Finland, France, Germany, Greece, Hungary, Iceland,
Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Republic of
North Macedonia, Romania, Serbia, Slovakia, Slovenia, Spain, Sweden, Switzerland, Türkiye and the
United Kingdom.
Endorsement notice
The text of ISO 16122-4:2024 has been approved by CEN as EN ISO 16122-4:2025 without any
modification.
Annex ZA
(informative)
Relationship between this European Standard and the essential health and
safety and environmental requirements of Directive 2009/128/EC
This European Standard has been prepared under Commission’s standardization request "M/435
Mandate to CEN, CENELEC and ETSI for the development of a standards on inspection of pesticide
application equipment in use" to provide one voluntary means of conforming to health and safety and
environmental requirements of the Directive 2009/128/EC of the European Parliament and of the
Council of 21 October 2009 establishing a framework for Community action to achieve the sustainable
use of pesticides [OJ L 309].
Once this standard is cited in the Official Journal of the European Union under that Directive,
compliance with the normative clauses of this standard given in Table ZA.1 confers, within the limits of
the scope of this standard, a presumption of conformity with the corresponding health and safety and
environmental requirements, of that Directive and associated EFTA regulations.
Table ZA.1 — Correspondence between this European Standard and annex II of
EU Directive 2009/128/EC [OJ L 309]
Health and safety and Clause(s)/sub-clause(s) Remarks/Notes
environmental requirements of of this EN
Directive 2009/128/EC
Annex II
— The pesticide application
4.2, 4.3, 4.4, 4.5, 4.6, 4.7, 4.8,
equipment must function reliably
4.9, 4.10, 4.11, 4.12
and be used properly for its
intended purpose ensuring that
pesticides can be accurately dosed
and distributed.
— The equipment must be in such
4.2.1, 4.2.2, 4.5.1, 4.5.2,
a condition as to be filled and
4.5.4, 4.5.5, 4.5.6, 4.5.7
emptied safely, easily and
completely and prevent leakage of
pesticides.
— It must permit easy and
4.5.8, 4.5.9, 4.5.2, 4.13
thorough cleaning.
— It must also ensure safe
4.5.4, 4.6.1, 4.6.2, 4.6.3,
operations, and be controlled and
4.8.2, 4.10.1, 4.12.1
capable of being immediately
stopped from the operator’s seat.
— Where necessary, adjustments
4.6, 4.9.2.3, 4.9.3.2, 4.9.3.3,
must be simple, accurate and
4.9.4.2, 4.10.2
capable of being reproduced.
1.  Power transmission parts 4.1
Health and safety and Clause(s)/sub-clause(s) Remarks/Notes
environmental requirements of of this EN
Directive 2009/128/EC
2.  Pump 4.2.2, 4.3.
3.  Agitation 4.4.
4.  Spray liquid tank 4.2.1, 4.2.2, 4.5
5.  Measuring systems, control and 4.6, 4.9.2.5, 4.9.3.5, 4.9.4,
regulation systems 4.10
6.  Pipes and hoses 4.2.1, 4.2.2, 4.7
7.  Filtering 4.8
8.  Spray boom 4.9.2
9.  Nozzles 4.9.2.2.2, 4.11.1, 4.11.2
10.  Distribution 4.11.2, 4.11.3, 4.12.2
11.  Blower 4.10
WARNING 1 Presumption of conformity stays valid only as long as a reference to this European
Standard is maintained in the list published in the Official Journal of the European Union. Users of this
standard should consult frequently the latest list published in the Official Journal of the European
Union.
WARNING 2 Other Union legislation may be applicable to the product(s) falling within the scope of
this standard.
International
Standard
ISO 16122-4
Second edition
Agricultural and forestry
2024-12
machinery — Inspection of sprayers
in use —
Part 4:
Fixed and semi-mobile sprayers
Matériel agricole et forestier — Contrôle des pulvérisateurs en
service —
Partie 4: Pulvérisateurs fixes et semi-mobiles
Reference number
ISO 16122-4:2024(en) © ISO 2024

ISO 16122-4:2024(en)
© ISO 2024
All rights reserved. Unless otherwise specified, or required in the context of its implementation, no part of this publication 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 ISO’s member body in the country of the requester.
ISO copyright office
CP 401 • Ch. de Blandonnet 8
CH-1214 Vernier, Geneva
Phone: +41 22 749 01 11
Email: copyright@iso.org
Website: www.iso.org
Published in Switzerland
ii
ISO 16122-4:2024(en)
Contents Page
Foreword .v
Introduction .vii
1 Scope . 1
2 Normative references . 1
3 Terms and definitions . 1
4 Requirements and method of verification . 1
4.1 General .1
4.2 Leaks and dripping .2
4.2.1 Static leaks .2
4.2.2 Dynamic leaks.2
4.2.3 Spraying and dripping on parts .2
4.3 Pump(s) .2
4.3.1 Capacity .2
4.3.2 Pulsations .3
4.3.3 Air chamber .3
4.4 Spray mix agitation . .3
4.4.1 Hydraulic .3
4.4.2 Mechanical .3
4.5 Spray tank(s) .4
4.5.1 Lid .4
4.5.2 Tank filling strainer(s) .4
4.5.3 Pressure compensation .4
4.5.4 Tank content indicator(s) .4
4.5.5 Tank emptying . .4
4.5.6 Tank filling .4
4.5.7 Induction hopper .4
4.5.8 Cleaning device for plant protection product containers .5
4.5.9 Cleaning equipment .5
4.6 Measuring systems, controls and regulation systems .5
4.6.1 General .5
4.6.2 Pressure indicator for spray liquid .5
4.6.3 Other measuring devices .6
4.6.4 Pressure adjusting devices .6
4.6.5 Direct injection systems .6
4.7 Lines (pipes and hoses) .7
4.7.1 Lines .7
4.8 Filters .7
4.8.1 Filter presence .7
4.8.2 Isolating device .7
4.8.3 Filter insert changeability .7
4.9 Application unit .7
4.9.1 Dripping .7
4.9.2 Horizontal spray booms.7
4.9.3 Vertical spray boom .9
4.9.4 Spray guns and lances .10
4.10 Blower.10
4.10.1 Condition .10
4.10.2 Adjustability .10
4.11 Distribution .10
4.11.1 Uniformity of spray jet .10
4.11.2 Nozzle output .11
4.11.3 Spray distribution measurement on a patternator (optional) .11
4.11.4 Optional vertical distribution information .11
4.12 Autonomous application units . .11

iii
ISO 16122-4:2024(en)
4.12.1 Drive system .11
4.12.2 Travel speed spray robots . 12
4.13 Cleaning equipment . 12
5 Test methods .12
5.1 Test facilities and equipment . 12
5.1.1 General . 12
5.1.2 Test facilities . 12
5.2 Spray agitation pumps . 12
5.2.1 Pump capacity test . 12
5.2.2 Pump pulsations .14
5.3 Sprayer´s pressure indicators.14
5.3.1 Specification of pressure indicators used for verification .14
5.3.2 Verification method of the sprayer pressure indicator .14
5.4 Flow meters for controlling the volume/area rate . 15
5.4.1 General . 15
5.4.2 Operating procedure No. 1: Verification by nozzle flow rate measurement . 15
5.4.3 Operating Procedure No. 2: Verification by installing a calibrated flow meter in
the circuit of the sprayer . 15
5.5 System for controlling forward speed . 15
5.6 Uniformity of the transverse volume distribution with a horizontal patternator . 15
5.6.1 Specification of the horizontal patternators used for verification . . 15
5.6.2 Calculation of coefficient of variation (C ) .16
V
5.6.3 Verification method of the uniformity of the transverse distribution .16
5.6.4 Verification method of spray gun/lance flow rate .16
5.7 Flow rate of the spray nozzles .16
5.7.1 General .16
5.7.2 Measurement with nozzles fitted on the sprayer .17
5.7.3 Measurement with nozzles removed from the sprayer .17
5.8 Pressure drop .17
5.9 Pressure variation when the sections are closed .17
5.10 Pressure variation when the spray is switched off .17
5.11 Accuracy of direct injection systems .17
5.12 Pressure distribution .18
Bibliography . 19

iv
ISO 16122-4:2024(en)
Foreword
ISO (the International Organization for Standardization) is a worldwide federation of national standards
bodies (ISO member bodies). 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 non-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 described
in the ISO/IEC Directives, Part 1. In particular, the different approval criteria needed for the different types
of ISO document should be noted. This document was drafted in accordance with the editorial rules of the
ISO/IEC Directives, Part 2 (see www.iso.org/directives).
ISO draws attention to the possibility that the implementation of this document may involve the use of (a)
patent(s). ISO takes no position concerning the evidence, validity or applicability of any claimed patent
rights in respect thereof. As of the date of publication of this document, ISO had not received notice of (a)
patent(s) which may be required to implement this document. However, implementers are cautioned that
this may not represent the latest information, which may be obtained from the patent database available at
www.iso.org/patents. ISO shall not be held responsible for identifying any or all such patent rights.
Any trade name used in this document is information given for the convenience of users and does not
constitute an endorsement.
For an explanation of the voluntary nature of standards, the meaning of ISO specific terms and expressions
related to conformity assessment, as well as information about ISO's adherence to the World Trade
Organization (WTO) principles in the Technical Barriers to Trade (TBT), see www.iso.org/iso/foreword.html.
This document was prepared by Technical Committee ISO/TC 23, Tractors and machinery for agriculture and
forestry, Subcommittee SC 6, Equipment for crop protection, in collaboration with the European Committee for
Standardization (CEN) Technical Committee CEN/TC 144, Tractors and machinery for agriculture and forestry,
in accordance with the Agreement on technical cooperation between ISO and CEN (Vienna Agreement).
This second edition cancels and replaces the first edition (ISO 16122-4:2015), which has been technically
revised.
The main changes are as follows:
— removed errors and resolve contradictions to the ISO 16119 series which specifies environmental
requirements for new sprayers;
— updated the normative references;
— modified the terms and definitions;
— modified requirements on filling high capacity spray-tanks during leak test;
— modified tank filling strainer/filling hole;
— modified tank emptying;
— modified pressure indicators;
— modified diameter analogue pressure indicators;
— modified maximum error flow-meters for controlling the volume/hectare rate;
— modified Figure 1;
— modified dripping;
— modified spray guns and lances;

v
ISO 16122-4:2024(en)
— modified pump capacity test.
A list of all parts in the ISO 16122 series can be found on the ISO website.
Any feedback or questions on this document should be directed to the user’s national standards body. A
complete listing of these bodies can be found at www.iso.org/members.html.

vi
ISO 16122-4:2024(en)
Introduction
There are two main reasons for the inspection of sprayers:
— reducing the potential risk of environmental contamination by plant protection products;
— good control of the pest with the minimum possible input of plant protection product.
In order to use plant protection products in agricultural production safely, it is necessary to define the
requirements and test methods for sprayers in use. This is a relevant step after having standardized
minimum requirements for new sprayers, in respect of safety hazards (see ISO 4254-6) and potential risks
of environmental contamination (see ISO 16119 series).
Standardising the requirements and methods for inspection of sprayers in use takes into consideration not
only the original performance of the sprayer but also its use, care and maintenance. This is a logical link to
ensure the continued benefit arising from the supply of new sprayers of good quality.
The inspection of sprayers in use can be a mandatory requirement or adopted on a voluntary basis. In
both cases further requirements, outside the scope of this document, are necessary for the management
of inspections. These include, for example, requirements for the competence of persons carrying out
inspections and the frequency of inspections.
The terms and definitions for specific sprayers are given in the relevant specific parts.
NOTE National or local regulations concerning the qualifications and competence of inspectors can apply.

vii
International Standard ISO 16122-4:2024(en)
Agricultural and forestry machinery — Inspection of sprayers
in use —
Part 4:
Fixed and semi-mobile sprayers
1 Scope
This document, when used together with ISO 16122-1:2024, specifies the requirements and test methods for
the inspection of fixed and semi-mobile sprayers, when in use.
The requirements relate mainly to the condition of the sprayer with respect to its potential risk for the
environment and its performance to achieve good application.
NOTE Requirements for the protection of inspectors during an inspection are given in ISO 16122-1:2024.
2 Normative references
The following documents are referred to in the text in such a way that some or all of their content constitutes
requirements of this document. For dated references, only the edition cited applies. For undated references,
the latest edition of the referenced document (including any amendments) applies.
ISO 5681:2020, Equipment for crop protection — Vocabulary
ISO 5682-2:2017, Equipment for crop protection — Spraying equipment — Part 2: Test methods to assess the
horizontal transverse distribution for hydraulic sprayers
ISO 12809:2020, Crop protection equipment — Reciprocating positive displacement pumps and centrifugal
pumps — Test method
ISO 16122-1:2024, Agricultural and forestry machinery — Inspection of sprayers in use — Part 1: General
3 Terms and definitions
For the purposes of this document, the terms and definitions given in ISO 5681:2020 apply.
ISO and IEC maintain terminological databases for use in standardization at the following addresses:
— ISO Online browsing platform: available at https:// www .iso .org/ obp
— IEC Electropedia: available at https:// www .electropedia .org/
4 Requirements and method of verification
4.1 General
Before starting the inspection, the pre-inspection requirements of ISO 16122-1:2024, Clause 5, shall be met.

ISO 16122-4:2024(en)
4.2 Leaks and dripping
4.2.1 Static leaks
The sprayer shall be filled with water to its nominal tank volume.
With the pump not running and the sprayer parked on a level horizontal surface (in case of semi-mobile
sprayer), a visual inspection for any leakage from the tank, pump and associated pipes shall be carried out:
and there shall be no visible leakage from any part of the sprayer.
For tanks with a volume > 2 000 l, water filling may be reduced to half the nominal volume or to 2 000 l,
whichever is the greater. For these cases, an additional visual inspection of the tank shall be carried out in
order to identify any cracks, holes or other damage that can cause leakage.
Compliance shall be checked by inspection.
4.2.2 Dynamic leaks
4.2.2.1 Leak test when not spraying
With the sprayer running at a pressure which is equal to the maximum working pressure as specified in
the sprayer instruction manuel, or if this is not known, max. 20 bar (10 bar for sprayers with the pneumatic
nozzles), with the section valves closed, there shall be no visible leakage from any part of the sprayer.
Compliance shall be checked by inspection.
4.2.2.2 Leak test while spraying
While spraying at a pressure that is equal to the maximum working pressure as specified in the sprayer or
the nozzle recommendations for the nozzles mounted on the sprayer if lower, there shall be no leakage from
any part of the sprayer or spray boom.
Compliance shall be checked by inspection.
4.2.3 Spraying and dripping on parts
Regardless of the distance between the spray boom to the target to be sprayed, in the range between the
nozzles and the target surface, no liquid shall be sprayed directly on to the sprayer itself (for example parts
of the sprayer, hoses). This does not apply if needed by function (for example sensors) and if dripping is
minimised.
Compliance shall be checked by inspection and function test.
4.3 Pump(s)
4.3.1 Capacity
4.3.1.1 General
The pump capacity shall be suited to the needs of the sprayer.
4.3.1.2 Sprayers built according to ISO 16119-4:2014
The agitation capacity (liquid backflow in the tank) of the pump shall be at least equal to the value given in
the instruction handbook.
Compliance shall be checked by measurement according to 5.2.1.2.

ISO 16122-4:2024(en)
4.3.1.3 Other sprayers
a) The pump capacity shall be at least 90 % of its original nominal flow as specified in the sprayer
instruction manual or another minimum pump capacity as specified in the sprayer instruction manual.
Compliance shall be checked by measurement according to 5.2.1.2.3.
Or for sprayers not fitted with a test adapter:
b) The pump(s) shall have sufficient flow rate capacity in order to be able to spray while maintaining a
visible agitation as specified in 4.4.1 or 4.4.2.
Compliance shall be checked following 5.2.1.2.2.
4.3.2 Pulsations
The pulsations shall not exceed 10 % of the working pressure.
Compliance shall be checked by measurement and function test according to 5.2.2.
4.3.3 Air chamber
If an air chamber is present the membrane shall not be damaged, there shall be no appearance of liquid when
operated at the maximum pressure as specified in the sprayer instruction manual. The air pressure shall
be the pressure as specified in the sprayer instruction manual, or between 30 % and 70 % of the working
pressure for the nozzles in use.
Compliance shall be checked by function test and measurement.
4.4 Spray mix agitation
4.4.1 Hydraulic
A clearly visible agitation shall be maintained:
— when spraying with a working pressure within the pressure range as recommended in the sprayer
instruction manual or the nozzle recommendations;
— when spraying at the maximum working pressure as recommended in the sprayer instruction manual or
the nozzle recommendations (whichever is lower);
— with the nozzles with the highest flow rate mounted on the application unit;
— with pump rotation speed as indicated in the sprayer instruction manual;
— with the tank filled to half its nominal tank volume.
Compliance shall be checked by inspection.
4.4.2 Mechanical
A clearly visible agitation shall be maintained when the agitation system is working as specified in the
sprayer instruction manual, with the tank filled to half its nominal tank volume.
Compliance shall be checked by inspection.

ISO 16122-4:2024(en)
4.5 Spray tank(s)
4.5.1 Lid
The tank shall be provided with a lid that shall be suited to the tank and without visible damage or permanent
deformation.
It shall be possible to seal the lid tightly to prevent leakage and unintended opening. This requirement does
not apply to fixed installations.
If a vent is fitted in the lid (according to 4.5.3), it shall prevent spillage.
Compliance shall be checked by inspection.
4.5.2 Tank filling strainer(s)
Strainers shall be installed in filling openings. The strainer(s) shall be without visible damage or permanent
deformation and shall have a mesh width less than 2 mm. Any gaps between the tank filling hole and the
strainer shall not exceed 2 mm.
Compliance shall be checked by inspection.
4.5.3 Pressure compensation
There shall be a pressure compensation device present, such as a tank vent, to avoid over-pressure and
under-pressure in the tank.
Compliance shall be checked by inspection.
4.5.4 Tank content indicator(s)
The volume of liquid in the tank shall be clearly readable from where the tank is filled.
Compliance shall be checked by inspection.
4.5.5 Tank emptying
It shall be possible to
— empty the tank using, for example, a tap, and;
— collect the liquid without contamination of the environment and without potential risk of exposure of
the operator.
Compliance shall be checked by inspection.
4.5.6 Tank filling
If there is a water filling device on the sprayer or a connection on the sprayer to fill the sprayer from an
external source, there shall be a provision that prevent the liquid in the sprayer from returning to the water
source, for example by means of a non-return valve.
Compliance shall be checked by inspection and function test.
4.5.7 Induction hopper
If there is an induction hopper, it shall:
— function and not leak;
— prevent any object greater than a ball of 20 mm diameter from entering the sprayer tank.

ISO 16122-4:2024(en)
Compliance shall be checked by measurement:
— function and not leak.
Compliance shall be checked by function test.
4.5.8 Cleaning device for plant protection product containers
If provided, the cleaning device for plant protection product containers shall function.
Compliance shall be checked by inspection and function test.
4.5.9 Cleaning equipment
If provided, tank cleaning devices, devices for external cleaning, devices for cleaning of induction hoppers,
and devices for the internal cleaning of the complete sprayer, shall function.
Compliance shall be checked by inspection and function test.
4.6 Measuring systems, controls and regulation systems
4.6.1 General
All devices for measuring, indicating and/or adjusting the pressure and/or flow rate shall function.
The valves for switching on or off the spray shall function.
Switching on and off of all nozzles shall be possible simultaneously.
The controls to be operated during spraying shall be operable from the operator’s position and the
instrument displays shall be readable from this position.
If using a spray boom, switching on and off individual boom sections shall be possible.
Compliance shall be checked by inspection and function test.
4.6.2 Pressure indicator for spray liquid
4.6.2.1 Quantity, position and range of pressure indicator(s)
A pressure indicator shall be present on the tank/pump unit.
An additional pressure indicator shall be present on the application unit, except for spray guns and lances.
The pressure indicators shall be fitted at a position where they are clearly readable. Pressure indicators
shall be suitable for the working pressure range used.
Compliance shall be checked by inspection.
4.6.2.2 Diameter of analogue pressure indicator
For analogue pressure indicators the minimum diameter shall be 63 mm.
Compliance shall be checked by measurement.
4.6.2.3 Scale of analogue pressure indicator
The scale of analogue pressure indicators shall provide graduations:
— at least every 0,2 bar for working pressures < 5 bar;

ISO 16122-4:2024(en)
— at least every 1,0 bar for working pressures ≥5 bar and < 20 bar;
— at least every 2,0 bar for working pressures ≥ 20 bar and < 40 bar;
— every 5 bar for working pressures ≥ 40 bar.
NOTE 1 bar = 0,1 MPa = 0,1 N/mm = 105 N/m .
Compliance shall be checked by inspection.
4.6.2.4 Accuracy of pressure indicator
The accuracy of the pressure indicator shall be:
— ±0,2 bar for working pressures at ≤ 2 bar,
— ±10 % of the real value for working pressures ≥ 2 bar.
This requirement shall be achieved within the normal working pressure range of the pump and the nozzles
mounted on the application unit under test.
Compliance shall be checked by measurement according to 5.3.
4.6.3 Other measuring devices
If flow meters and speed sensors are present for controlling the volume/area rate, flow meters shall measure
within a maximum error of ±10 % of the value read on the reference instrument within the range of the
measuring
...