LINEARTESTER 249 - Senze-Instruments Benelux

Senze-Instruments BENELUX
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Process & Quality Control


Coatings & Industry > Physical properties > Hardness
Scratch Hardness Tester LINEARTESTER Model 249
The optimized LINEARTESTER 249 scratch hardness tester can be used to determine the resistance of surfaces to scratches, and in many other ways: for scratch/scribe tests, double stroke abrasion tests, Crock meter tests, MEK tests, solvent resistance tests in general or wipe tests.
The LINEARTESTER 249 is a tabletop unit.
The electromotive drive ensures smooth carriage movements.
The lowering or lifting of the test tool for the scratch/scribe tests is carried out automatically.
There are many different testing tools available.

Purpose and Application
The optimised scratch hardness tester LINEARTESTER 249 is intended, in addition to its original purpose of application, i. e. to establish the ability of a surfaces to resist damage by scratching, also for several other tests:
- Scribe/Scratch tests
- To and fro-cycle abrasion tests
- Crockmeter tests
- MEK tests, tests determining the resistance against solvents in general or wipe test, respectively.
Principle of the Test
The test panel is fixed onto a mobile slide by means of clamping rails.
Above this slide and held on two metal pillars is a reciprocating beam bedded in a free-moving manner and carrying the adequate test tool as well as a weight.
The required scratching force in the range of (0.5 to 20)N is set by moving the weight along the reciprocating beam, making use of a setting scale (an additional load weight of (1 to 40)N is optionally available).
The testing machine is equipped with a 4-position height adjustable load arm device with standard height of about 10 mm (+20/+40/+60 mm).
To use the vertical adjustment, a set of guide plate high level adapters is also required (Order No. 02101.01.32). To start a scratch/scribe test, the test tool is lowered onto the specimen when moving forward initiating the scratching process immediately.
The optionally used guide plate lifts the tool up, when the slide with the sample plate moves back. The test panel can be moved sideways so that a series of scratches can be carried out side by side with different force settings.
Due to a ruler integrated in the slide plate, an uniform distance between the scratches can be achieved very easily.
When testing insulating coatings on conducting substrates, an electric recognition of the through-scratching offers an additional security for setting the scratching force. For abrasion tests, crockmeter tests, MEK or wipe tests the test movement is carried out with the tool lowered onto the specimen, in preset cycles to and fro.
For this, the guide plate has to be removed from the slide plate.
There are three fixed as well as one freely programmable test speeds available. In addition to the fixed stroke length of 60 mm, the LINEARTESTER can be equipped optionally with variable stroke lengths (five additional stroke lengths of 35 mm, 50 mm, 65 mm, 80 mm and 95 mm).

The LINEARTESTER 249 is a tabletop unit.
The electromotive drive ensures a uniform forward motion of the slide.
The test tool is lowered and lifted automatically when scratch/scribe tests are carried out.
A multitude of different test tools are available (see table on the next page).
The tools marked with (*) are made of Tungsten Carbide Steel, additionally covered with an extremely hard layer.
Due to this layer’s "golden" appearance, any worn parts are visually very easy recognizable because the Tungsten Carbide Material
under the "golden" layer has a distincly different color.
With the optional available universal adapter set (see last page) even also several user-specifc tool inserts can be used.

Order Informations

Ord.-No.                       Product Desciption
101-0263.01.31     Scratch Hardness Tester LINEARTESTER 249 with an electromotive drive

The scope of supply includes:
  • Hex key,
  • circular level,
  • power pack,
  • operating manual
Accessories 1

Order Informations

Ord.-No.                       Product Desciption
101-0839.01.32      Load weight (1 - 40) N
11-2101.01.32         Guide plate height level adapters (set)
101-2043.01.32      Variable stroke lenghts

Test Tip with long shaft
101-915030241      Test tip acc. to Clemen (R 1.0 mm)
101-0693.01.32       Test tip acc. to van Laar (Ø 0.5 mm)
101-0842.01.32       Test tip acc. to IHD (Ø 0.6 mm)
101-0208.02.32       Test tip acc. to ISO (Ø 1.0 mm)
101-915030441       Test tip acc. to VW (3 mm/60°)
101-0741.01.32        Test tip acc. to (0.5 mm/90°)
101-0740.01.32        Test tip acc. to (1.0 mm/90°)

Equipment for MEK test
101-0840.01.32        MEK-Attachment 0841.01.32 Test plugs made of high dense special felt Equipment for Crockmeter test
101-0849.01.32        Crockmeter Attachment
101-0364.08.53        Crockmeter test head according to BMW AA-0134 (conforms to Rub Head C acc. to DIN 55654)
101-0364.08.53        Crocking cloth
Accessories 2

Universal adapter set and accessories
101-0690.01.32        Universal Adapter Set

Spherical inserts for the clamping adapter (short shaft without clamping device)
101-0539.01.32         Test tip acc. to van Laar (Ø 0.5 mm)
101-0539.02.32          Test tip acc. to Bosch (Ø 0.75 mm)
101-0539.03.32          Test tip acc. to ISO (Ø 1.0 mm)
101-0539.07.32          Test tip acc. to ISO (Ø 1.0 mm) – additionally covered with an extremly hard layer
101-0539.04.32           Test tip acc. to BMW (Ø 3.0 mm)

Asymmetric inserts (short shaft with clamping device)
101-0218.02.32           Test tip acc. to Clemen (R 1.0 mm)
101-0564.01.32           Test Tip for cross hatch cutting (30°) – additionally covered with an extremly hard layer

Inserts (Ø 16 mm/R 0.5 mm) for the disc adapter
101-0430.01.32            Test discs made of Duroplast
101-0430.02.32            Test discs made of copper
101-0430.03.32            Test discs made of stainless steel
101-0539.05.32             Test discs made of stainless steel, additionally covered with an extremly hard layer

Adapter for abrasion tests
101-0844.01.32             Squarish adapter (egde length 25 mm)
101-0845.01.32             Cylindrical adapter (dia. 25 mm)
Technical Data

Dimensions (L x W x H)                580 mm x 280 mm x 210 mm
Specimen dimensions max.        150 mm x 210 mm (DIN A 5)
Power supply                                       (100 - 240) VAC, (47 - 63) Hz
Net weight                                            approx. 13 kg
Scratching force                                 (0.5 – 20) N
Medium test speed                           25/35/200 mm/s (fixed)
                                                                     (10 – 200) mm/s programmable
Length of cycle                                    60/110 mm (with/without guide plate)
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