Zehntner ZSH 2290 User manual

ZSH 2290
Pencil Hardness Tester
Instruction manual

Page 3
Index
Exclusion of liability .......................................................................................................
1 Description of device ............................................................................................... 5
2 Safety information ................................................................................................... 6
2.1 Symbols used ..................................................................................................... 6
2.2 Safety notes and hints ....................................................................................... 6
3 Delivery of device ..................................................................................................... 7
3.1 Damages during carriage .................................................................................. 7
3.2 Shipment ............................................................................................................ 7
3.3 Standard delivery ............................................................................................... 8
Device overview ........................................................................................................ 9
5 Preliminaries ......................................................................................................... 10
5.1 Pencil preparation ........................................................................................... 10
5.2 Inserting the pencils ........................................................................................ 11
6 Handling ................................................................................................................. 12
7 Cleaning and storage ............................................................................................. 1
8 Technical specifications ........................................................................................ 1
Glossary ....................................................................................................................... 15

Page
Exclusion of liability
Illustrations, descriptions as well as the technical specifications conform to the
instruction manual on hand at the time of publishing or printing. However, Zehntner
GmbH Testing Instruments policy is one of continuous product development. All
changes resulting from technical progress, modified construction or similar are
reserved without obligation for Zehntner to update.
Some of the images shown in this instruction manual may be of a preproduction
model and/or are computer generated; therefore the design / features of the
delivered product may differ in various aspects.
The instruction manual has been drafted with the utmost care. Nevertheless, errors
cannot be entirely excluded. The manufacturer will not be liable for errors in this
instruction manual or for damages resulting from any errors.
The manufacturer will be grateful at any time for suggestions, proposals for
improvement and indications of errors.
© Zehntner GmbH Testing Instruments

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1 Description of device
The ZSH 2290 is a hardness tester according to Wolff-Wilborn with three test loads
for determination of resistance of coatings to mechanical stress by pencils of
different hardness.
Application areas:
• For many sectors of industry including paint, furniture and vehicle
• Laboratory testing apparatus for quality control, research and development
• Practically applicable to all flat single- and multi-coat systems
In particular, this instrument has the following features
• Practical pencil height setter for easy insertion of pencils as well as for load
release between tests
• Easy to handle
• Reliable results
• No maintenance required

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2 Safety information
2.1 Symbols used
This note comprises instructions needed to follow directions, specifications,
proper working procedure and to avoid data loss, damage or destruction of
the instrument.
This note signifies a warning about dangers to life and limb if the apparatus
is handled improperly. Observe these notes and be particularly careful in
these cases. Also inform other users on all safety notes. Besides the notes
in this instruction manual the generally applicable safety instructions and
regulations for prevention of accidents must be observed.
2.2 Safety notes and hints
The ZSH 2290 is exclusively intended for determination of resistance of
coatings to mechanical stress by pencils of different hardness according to
Wolff-Wilborn. Any other use is considered as being not in accordance with
the intentions of the manufacturer and is conducted at the user's own risk.
The manufacturer is not liable for any resulting damages.
Avoid any mode of operation that could affect the safe working with the ZSH
2290. Especially the determination of the scratch hardness must take place
as described in this instruction manual.
Unauthorized modifications and changes of the ZSH 2290 are not permitted.
Reproduction without permission is not allowed.
Zehntner GmbH Testing Instruments refuses all warranty and liability
claims for damages caused by usage of the ZSH 2290 in combination with
non-original accessories, or accessories from 3
rd
party suppliers.
All local safety regulations apply for the operation of the ZSH 2290.

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3 Delivery of device
3.1 Damages during carriage
On receipt of the goods, check for any visible damages on the packaging. If they are
undamaged you may sign the receipt of the goods. If you do suspect by your visual
inspection that damage has occurred, make a note of the visible damage on the
delivery receipt and request the courier to countersign it. Moreover, the courier
service must be held responsible for the damage in writing.
If a hidden damage is discovered while unpacking, you have to inform and hold the
courier liable immediately in the following way: “When opening the parcel we had to
notice that … etc.“ This superficial checking of the goods has to be done within the
time limit set by the carrier, which is normally 7 days. However, the period could
vary depending on the courier. Hence, it is recommended to check the exact time
limit when receiving the goods.
If there are any damages also inform your authorized Zehntner agent or Zehntner
GmbH Testing Instruments immediately.
3.2 Shipment
Should the device be transported again, it must be packaged properly. Preferably
use the original packaging for later shipments. Additionally use filling material in
the package to protect the device from any shock during carriage.

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3.3 Standard delivery
The following parts are included in the delivery:
1 pencil hardness tester
with test load 5 N, 7.5 N and 10 N
1 set pencils in 17 hardness degrees (6B to 9H)
1 sharpener for exposing the lead cylindrically
1 pencil holder
1 set emery paper (No. 00)
1 certificate of manufacturer
1 instruction manual
1 carrying case
Zehntner GmbH Testing Instruments refuses all warranty and liability
claims for damages caused by usage of the ZSH 2290 in combination with
non-original accessories, or accessories from third party suppliers.

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Device overview
(1) Pencil guides
(2) Pencil height setter (also load release function)
(3) Fixing screw (one for each test load)
( ) Wheel
(5) Wheel hubs
(1)
(2)
(
3
)
(
)
(
5
)

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5 Preliminaries
5.1 Pencil preparation
• Carefully remove the wooden mantle with the sharpener on a length of
approximately 5-6 mm. Make sure not to damage the lead. The remaining
wood can be removed by a fingernail.
• Rub the lead against the emery paper (No. 00) maintaining an exact angle of
90° to the paper until a flat circular surface is obtained at the tip of the lead.
• Repeat this procedure after each test.
Always sharpen the pencils and trim the leads as specified in the standards
you use.

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5.2 Inserting the pencils
• Place the ZSH 2290 on a flat surface.
• Put the pencil height setter into load release position.
• Insert the selected pencil into the pencil guide of the desired load (5N, 7.5 N or
10 N) of the ZSH 2290, until the lead touches the surface.
• Tighten it with the respective fixing screw.

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6 Handling
The test needs to be carried out under laboratory conditions.
Always carry out the test as described in the required standard.
• Determine the pencil hardness under laboratory conditions (temperature,
humidity
• Sharpen the pencils and trim the leads as described in chapter 5.1 “Pencil
preparation” on page 10.
• Place the ZSH 2290 on a flat surface and insert the pencil as described in
chapter 5.2 “Inserting the pencils” on page 11.
• Place the hardness tester on the coating under test.
• Put the pencil height setter into test position.

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• Hold the ZSH 2290 at the wheel hubs (5) and move it forward at uniform speed
for a sufficient length (at least 3 mm – see the standards).
Hint: In order to obtain evaluable results it is recommended to move the tester
forward for a sufficient length.
• Inspect the test surface with the naked eye for indentation or scratching.
• Repeat the test using pencils of increasing hardness until the lead of the
pencil penetrates into the coating and a marking occurs over a distance of at
least 3 mm.
• The degree of hardness of this pencil is the pencil hardness (Wolff-Wilborn
hardness) of the coating.
The following degrees of hardness are available:
• For further details see the standards.
• Put the pencil height setter into load release position when not in use.

Page 1
7 Cleaning and storage
• For cleaning of the unit use a clean, soft cloth. Only use mild cleaning agents.
• Store the ZSH 2290 and any accessories in its carrying case in order to avoid
damages.
Do not use strong acids or alkaline liquids for cleaning.
8 Technical specifications
Test load: 5 N, 7.5 N and 10 N
Material hardness tester: steel
Material pencils: wood and graphite
Dimensions (LxWxH): 150 mm x 61 mm x 9 mm (5.91” x 2. 0” x 1.93”)
Weight: 1. kg (3.09 lbs)
Standards: ASTM D3363, DIN SPEC 9106 , ECCA-T ,
EN 13523- , ISO 1518 , MIL C 27 227, NEN 5350,
SIS 18 187, SNV 37113 (withdrawn 2006)
Warranty: 2 years

Page 15
Glossary
C
Cleaning .......................................... 1
D
Damages during carriage ................. 7
Device
Damages........................................ 7
Delivery .......................................... 7
Description .................................... 5
Overview ........................................ 9
Standard delivery .......................... 8
E
Exclusion of liability ..........................
Extent of delivery .............................. 8
F
Features ............................................ 5
H
Handling .......................................... 12
I
Inserting the pencils ....................... 11
Instrument
Damages ....................................... 7
Delivery ......................................... 7
Description .................................... 5
Overview ........................................ 9
Standard delivery .......................... 8
P
Preliminaries .................................. 10
Preparation
Inserting the pencils ................... 11
Pencil ........................................... 10
S
Safety information ............................ 6
Shipment ........................................... 7
Storage ............................................ 1
T
Technical specifications ................. 1
Transportation
Damages ....................................... 7

Zehntner GmbH Testing Instruments, Gewerbestrasse , CH – 50 Sissach, Switzerland
Tel.: + 1 (0)61 953 05 50, Fax: + 1 (0)61 953 05 51, [e-mail], www.zehntner.com
Version 1.0 dated 28.09
.2017