DSA25 accessories

With the comprehensive range of accessories for our Drop Shape Analyzer – DSA25, you can not only extend the scope of your instrument, but also adapt the measuring conditions exactly to suit your individual samples and requirements.

Sample tables, axes and sample holders

A large selection of sample tables, axes and sample holders make it easy for you to position your special sample. Also, many solutions are available for the measurement of particular sample shapes and surface properties.

PA4020 – DSA25 tilting device

PA4020 – DSA25 tilting device

The tilting device PA4020 is our special unit for the flexible analysis of inclined surfaces with the DSA25. The tilt which leads to the drop running off as well as the advancing and receding contact angle of the moving drop lead to conclusions concerning roughness and adhesion of the sample.

Furthermore, the roll-off angle is informative for ultra­hydrophobic samples and is accurately measured with slow tilt movements. To determine this parameter precisely, our ADVANCE software detects the coordinates of the three-phase points, which indicate the position of the drop in the camera image. The change in these coordinates can be measured accurately, yielding an objective criterion for detecting the roll-off angle.

As the whole instrument is tilted, the surface is always in the same position relative to the lens. This makes the video evaluation very easy, and changes in the drop can also be tracked visually. Almost all other measuring methods and options provided by your instrument can be used without changing the setup. The tilting movement and related measurements can be embedded in automatic measuring sequences.

  • Angle of inclination up to 90° with a resolution of 0.1°
  • Tilt speed from 0.1°/s to 4.5°/s

PS3244 – Manual micro positioning table

PS3244 – Manual micro positioning table

The sample table PS3244 is designed for the ultra-precise positioning of small samples. Manual fine drives for the x- and y-direction enable the table to be moved to the required measuring position with pinpoint accuracy. Samples with heights up to 2 mm can be securely fixed using the versatile, attachable sample holder.

ST3210 – Vacuum table

ST3210 – Vacuum table

The vacuum table ST3210 has a permeable tabletop through the pores of which samples are drawn homogeneously on a large area of 150 × 220 mm. The table ensures a flat and easy-to-analyze surface when carrying out measurements on films as well as samples with only low elasticity or softness. It can be mounted flexibly on horizontal movement axes or (with DSA100 and DSA30) on a rotation axis. A vacuum pump, which is required for operating the table, can be obtained from us.

ST10 – Set for measuring contact angle in bulk liquid

ST10 – Set for measuring contact angle in bulk liquid

We have developed the sample holder and dosing set ST10 for measuring contact angle in a bulk liquid phase. Gas bubbles (Captive Bubble) or drops are dosed beneath the sample with the help of the set’s special needle and cuvette, e.g. for analyzing hydrogels and highly energetic and structured surfaces. The special holders optimize measurements on contact lenses, films and textiles as well as on rigid samples.

ST01 – Suction plate for soft, flexible samples (foils, films)

ST01 – Suction table for soft, flexible samples (foils, films)

The suction plate ST01 ensures that a smooth, flat surface is achieved with foils, films and similar samples. This guarantees a reliable and precise measurement of the contact angle on such soft, flexible materials. The wide area of 100 × 100 mm creates space for a large number of dosed drops. A vacuum pump, which is required for operating the plate, can be obtained from us.

VP01 – Vacuum pump

VP01A – Vacuum pump

The vacuum pump VP01 is a useful aid which can be used with many of our measuring instruments for the following purposes: 

  • Degassing of liquids for picoliter dosing units or for interfacial rheology to prevent the formation of troublesome air bubbles (with additional connector set SP01)
  • Removal of dosed drops when measuring contact angle to enable several positions along the optical axis to be analyzed (with additional connector set SP01)
  • Flushing the tiny dosing opening of picoliter dosing units (with additional connector set SP01)
  • Producing the vacuum for fixing foils and films for the suction table ST01
  • Use of the vacuum for the filter base cleaning tool TO4501 for the Dynamic Foam Analyzer – DFA100

ST03 – Powder sample holder for optical contact angle measurements

ST03 – Powder sample holder for optical contact angle measurements

The powder sample holder ST03 is a sample table adapter with three depressions for measuring the contact angle on powder beds. The depressions are filled with powder which is then smoothed out resulting in flat surfaces for dosing liquids. The three separate areas enable at least three positions to be analyzed without being affected by adjacent drops, even in the case of absorbent powders. Please also refer to the alternative Washburn-Method for powder contact angle with our Force Tensiometer – K100.

ST04 – Sample holder for foils and paper

ST04 – Sample holder for foils and paper

We have designed the special sample holder ST04 for measuring contact angle on foils and paper. The clamping device ensures an ideally smooth, flat surface, even with corrugated and rolled samples. The holder takes samples with a surface area of 80 × 80 mm and a thickness of up to 4 mm.

ST08 – Holder for uneven samples

ST08 – Holder for uneven samples

When measuring the contact angle on uneven samples, dosing must be carried out on a raised point in order to obtain an analyzable shadow image of the drop. For this purpose, the sample table adapter ST08 has a domed shape, over which the samples are tightened with the help of a magnetic clamping device. Combining with horizontal axes enables several measurements to be made in quick succession by dosing accurately along the crest.

Dosing units, syringes, needles, cuvettes

We provide reliable dosing solutions for static or dynamic contact angle, interfacial tension measurements and many other special cases. Our dosing accessories equip your instrument for all tasks relating to the production and placing of drops.

DS3252 – Double-dosing unit for extremely fast, fully automatic SFE measurements

DS3252 – Double-dosing unit for extremely fast SFE measurements
Software screenshot of the parallel drop evaluation

Our DS3252 double-dosing module performs fully automated surface free energy (SFE) determinations, using an automation program in our ADVANCE software. The dosing unit has two pressure dosing mechanisms working in parallel, each simultaneously dispensing one drop of the test liquids water and diiodomethane onto the sample.

For carrying out the drop shape analysis, the image field of the high resolution camera is split into two video windows for viewing both drops at the same time in order to analyze the drops in parallel. The software then uses the resulting contact angles to calculate the SFE of the solid. The entire process, from the point when dosing starts up to the SFE calculation, is fully automatic and complete within a second. For this innovative measuring method, we hold a patent regarding the novel dosing technology.

The kinetic energy of the dosing process – despite its speed – is equivalent to gently dispensing a drop from a dosing needle. Most importantly, this noncontact method eliminates the risk of contamination or damage caused by inadvertently touching the sample. Cartridges, that operators can remove quickly and fill directly with test liquids, make the dosing system easy to handle. One filling is enough for approximately 1000 SFE determinations.

The dosing unit DS3252 requires our CF03 USB camera.

In addition to the dosing unit, the following components are also included in the scope of supply:

  • 10 cartridges with Luer-Lock connector: 5 transparent for water and 5 brown for diiodomethane
  • 10 disposable syringes (1 mL) with Luer connector
  • 10 Luer-Lock adapters
  • 1 transparent and 1 brown 25 mL glass bottle for test liquids
  • Tool for easy removal of cartridges from the dosing unit
  • Cleaning set for the dosing valves

The first three positions on this list are also available as spare part set SP52.

SY20 – 500 µL glass syringe with Luer-Lock connector

SY20 – 500 µL glass syringe with Luer-Lock connector

The precision glass syringe SY20 is used for our manual dosing unit DS3205 or software-controlled dosing units D03211/DO4011 for one liquid. The gas-tightness of the syringe plunger and the Luer-Lock connector ensure that drops are dosed in a controlled manner even with low-viscosity liquids.

SY3601 – Disposable 1 mL syringe with Luer connector (100 pieces)

SY3601 – Disposable 1 mL syringe with Luer connector

The syringe SY3601 can be fitted to many of our manual and software-controlled dosing solutions and can be used for almost all liquids. It is particularly suitable for dosing highly contaminating substances such as adhesives or paints. The Luer connector ensures safe, gas-tight connections to needles and other dosing components. The syringe is supplied in sets of 100.

NE93/NE96 – Needle sets for surface and interfacial tension

NE96 – Needle set for surface and interfacial tension
NE93 – Set of coated needles for surface and interfacial tension

The choice of a suitable needle diameter maximizes the accuracy of surface and interfacial tension measurements using the Pendant Drop method.
For this purpose, the needle set NE96 (top picture) contains stainless steel needles with a length of 38 mm and different outside diameters (0.5/1.0/2.0/3.0 mm), in order to achieve an ideal drop shape for analysis in every measuring range.In the set NE93 (bottom picture), the four different needles are also PTFE-coated and optimize the analysis of liquids with good wetting properties. The coating prevents external wetting of the needle and ensures absolutely symmetrical drop shapes.

NE94 – Set of disposable needles for contact angle and pendant drop

NE94 – Set of disposable needles for contact angle and pendant drop

The needle assortment NE94 provides a range of suitable needles for measuring contact angle as well as surface and interfacial tension (SFT/IFT) using the Pendant Drop method. Steel, PP and PTFE needles with a length of 38 mm and different diameters enable optimal dosing for solids and liquids with different wetting behavior. All needles have a Luer-Lock connector for secure attachment to all single and multi-dosing units.


Contents of the set:

  • 5 steel needles with 1.8 mm diameter (SFT/IFT)
  • 5 steel needles with 0.5 mm diameter (contact angle)
  • 5 PTFE needles with 2.0 mm diameter (SFT/IFT)
  • 5 PTFE needles with 1.0 mm diameter (SFT/IFT)
  • 5 PTFE needles with 0.5 mm diameter (contact angle)
  • 5 PP needles (flexible syringe) with 0.7 mm diameter (contact angle)

NE97 – Needle set for measurements on rising air bubbles or drops

NE97 – Needle set for measurements on rising air bubbles or drops

The set NE97 with three J-shaped needles has been put together especially for measurements with the Captive Bubble method and with rising drops. The 0.5 mm diameter needle enables highly energetic, structured or pre-wetted surfaces (e.g. contact lenses) to be analyzed. With two further needles (1.0 and 2.0 mm), the interfacial tension can be measured on rising drops. This enables systems such as crude oil/water, in which the lighter phase is not transparent, to be analyzed optically.

NE50 – Needle for dosing small volumes

NE50 – Needle for dosing small volumes

The needle NE50 with 5 µm internal diameter has been designed for the manual dosing of small volumes below the microliter range. The water-repellent surface lets drops detach easily from the needle and allows to place them accurately in the required position on your sample. Please also see our accessories for dosing drops in the picoliter range and the analysis of minute probes using microscope lenses.

SC01/SC02 – Glass cuvettes for pendant drop and contact angle measurement in liquid

SC01 – Glass cuvette for pendant drop and contact angle measurement in liquid
SC02 – Large glass cuvette for pendant drop and contact angle measurement in liquid

The glass cuvettes SC01 and SC02 accommodate the bulk phase when measuring the interfacial tension using the Pendant Drop method. When measuring surface tension, the cuvettes screen the dosed drop against air currents. With the smaller cuvette SC01 (top picture), this is also ensured by an additional cover which additionally prevents the drop evaporating. The smaller cuvette SC01 can be used when taking measurements in a temperature controlled chamber for measuring interfacial temperature as a function of temperature.

Because of its larger design, the SC02 (bottom picture) is particularly suitable for measuring the contact angle in the bulk liquid. Both cuvettes are made of high-quality optical glass. As a result, drops are displayed without distortion, thus guaranteeing an accurate analysis of the drop shape.


Overview of both products:

  • SC01: Cuvette with inner dimensions 20 × 20 × 24 mm (W × D × H), with cover, can be used in temperature controlled chambers
  • SC02: Cuvette with inner dimensions 36 × 36 × 30 mm, particularly suitable for measuring the contact angle in the bulk liquid.

Environmental chambers and temperature control equipment

A comprehensive range of accessories for carrying out measurements at defined temperature and humidity makes it possible for you to accurately simulate the environmental conditions for your product or process during the measurement or to analyze melts.

TC11 – Temperature controlled chamber for large samples

TC11 - Tempering chamber for large samples

The temperature controlled chamber TC11 has been specially developed for measuring the contact angle on large samples at temperatures of up to 130 °C. The slide-in sample tray is conveniently loaded outside the chamber and can be moved from the outside when the chamber is closed and at the required temperature. Small samples are prevented from shifting by means of removable holding clamps. The front viewing window simplifies dosing in the required sample position.

  • For sample sizes up to 132 × 132 × 27 mm (W × D × H)
  • Temperature range between -10 and 130 °C (suitable thermostats are available from us)
  • Precision temperature sensor included
  • Inert gas connector provided

TC21 – Temperature controlled chamber for high temperatures

The temperature controlled chamber TC21 enables liquid and solid surfaces to be analyzed at temperatures up to 400 °C. The target temperature is easy to specify and is reliably achieved at defined heating rates. The chamber’s excellent insulation ensures stable equilibrium during the measurement. With the help of the accurate temperature sensor, the current value is recorded by the software together with the contact angle or the surface tension. (Please also see our solutions for high-temperature measurements up to 1750 °C.)

  • Electrically controlled temperature between 50 and 400 °C
  • Precision temperature sensor included
  • Ideal in combination with the high-temperature dosing unit DS3241/DS4241

TC30 – Temperature controlled chamber up to 90 °C

TC30 – Tempering chamber up to 90°C

The wettability of solid samples can be reliably analyzed at temperatures up to 90 °C with the help of the temperature controlled chamber TC30. The well-sealed and insulated plastic housing and a copper heat-conducting hood ensure stable thermodynamic equilibrium. Gas purging of the viewing window is effective against condensation. The dosing position can be conveniently adjusted from the outside when the chamber is closed and at the required temperature.

  • Temperature range between 5 and 90 °C (suitable thermostats are available from us)
  • Precision temperature sensor included
  • Inert gas connector provided
  • Can be ideally combined with the humidity chamber HC10

TC40 – Temperature controlled chamber for rapid temperature changes

TC40 - Tempering chamber for rapid temperature changes

With rapid temperature changes between -30 and 160 °C, the temperature controlled chamber TC40 is our flexible solution for wettability analyses under different thermal conditions. The insulating plastic housing and a heat-conducting copper  hood ensure a uniform, stable internal temperature. A gas flow can be connected in order to avoid condensation and icing of the viewing window. The dosing position is conveniently adjusted from the outside when the chamber is closed and at the required temperature.

  • Fast electrical temperature control between -30 and 160 °C
  • Precision temperature sensor included
  • Inert gas connector provided
  • Can be combined with the humidity chamber HC10 between 5 and 90 °C

TC3212 – Temperature controlled unit for liquids

TC3212 – Tempering unit for liquids

The unit TC3212 tempers liquids for measuring contact angle or surface tension at up to 130 °C. Embedded in a heat-conducting metal sleeve, the filled syringe quickly reaches the desired temperature. With the help of a sensor, the temperature is measured directly at the syringe and assigned to the measurement in the software. The unit is easy to fit and ideally complements your software-controlled or manual single dosing unit.

  • Temperature range -10 to 130 °C (suitable thermostats are available from us)
  • Precision temperature sensor TP20 included
  • Also suitable in combination with temperature controlled chambers TC11, TC30 and TC40

SC30 – Glass cuvette for temperature-controlled measurement of interfacial tension

SC30 – Glass cuvette for temperature-controlled measurement of interfacial tension

We have designed the glass cuvette SC30 for controlling the temperature of the bulk phase at up to 130 °C when using the Pendant-Drop Method. The high-quality optical glass ensures distortion-free imaging of the drop and therefore accurate measuring results.

  • Temperature range -10 to 130 °C. (Suitable thermostats are available from us.)
  • Precision temperature sensor TP20 included
  • With insulating cover

HC10 – Humidity chamber

HC10 – Humidity chamber

The wettability of a surface is affected by the climatic ambient conditions. Using the humidity chamber HC10 in combination with a temperature controlled chamber TC30/TC40 enables you to measure contact angles at precisely controlled humidity and temperature.

At temperatures above 50 °C and humidities above 65%, we recommend using the optional insulating hood TC3200 (bottom picture). This hood enables the target humidity to be reached even more quickly and maintained with better stability.

  • Relative humidity (without insulating hood): 15 - 85% at 22 °C, up to 89% at 10 - 15 °C, up to 5% at 70 - 90 °C
  • Time to achieve target value: 20 - 300 s
  • External compressed air supply required (3-6 bar, very dry air). A suitable compressor is available from us.
  • Temperature range between 5 and 90 °C (suitable thermostats are available)

TP20 – Temperature sensor

TP20 – Temperature Sensor

The TP20 is a highly accurate temperature sensor which can be used flexibly with your instrument. Thanks to the large measuring range between -50 and 400 °C at 0.1 °C precision, it measures room temperature just as reliably as the working temperature of our accessories for temperature control. Measurement is carried out immediately at the sensor tip, thus reproducing the actual conditions directly at the solid or in the liquid sample. Our software links the temperature to the current analysis results.

Calibration standards

With our calibration standards you can check the accuracy of the drop shape analysis carried out by your instrument and validate the optical measuring equipment. The standards consist of glass slides with modeled drop shapes which have been accurately calculated and printed with high precision.

CP70/CP70C – Standard with shapes of sessile and pendant drops for the Young-Laplace method

CP70/CP70C – Standard with shapes of sessile and pendant drops for the Young-Laplace method

The drop shape standard CP70/CP70C contains an arrangement of shapes printed on one slide which accurately follow the theoretical drop shape according to Young-Laplace. Having all required drop shapes on one standard makes the calibration procedure especially easy and also allows carrying out automated calibrations.

The standard is used to calibrate the Young-Laplace method for measuring the contact angle and the surface tension. Shapes with contact angles of 30°, 60° and 120°, each for standard and microscope optics deviate by less than 0.1° from the nominal value. Equally precise are two shapes of pendant drops with nominal surface tension values of 30 mN/m and 70 mN/m with a maximum deviation of 0.01 mN/m. To support you in accurately aligning the slide to the camera, cross-wires are printed onto it on both sides.

The CP70C type of the standard additionally includes a certificate which confirms the high accuracy of the print.

CP21/CP22 – Sets of contact angle standards for the height-width method

CP21/CP22 – Sets of contact angle standards for the height-width method

The sets CP21 and CP22 each contain standards with shapes of exactly circular drops for calibrating the height-width method and the circle method for measuring the contact angle. The shapes with contact angles of 30°, 60° and 120° deviate by less than 0.1° from the nominal value. The set CP22 additionally includes a certificate which confirms the high accuracy of the print.

CP29/CP33 – Standards for small contact angles with the circle method

CP29/CP33 – Standards for small contact angles with the circle method

The standards CP29 and CP33 are designed for calibrating the circle method for measuring contact angles in the lower range of this method. The printed shape with a contact angle of 10° is exactly circular. The deviation from the nominal value is less than 0.1°. The standard CP33 is supplied with an additional certificate which confirms the high accuracy of the print.

Components for the top view distance method

Our own top view distance method (Top View Analysis, TVA) measures small contact angles particularly accurately and enables analyses to be carried out in depressions and on concave surfaces. The TVA measuring head is available as a stand-alone measuring instrument or as a modular accessory for your DSA25.

TVA100 – Module for measuring contact angle using the top view distance method

TVA100 - Module for measuring contact angle using the top-view distance method

The TVA100 module equips your instrument for carrying out surface analyses using the top view distance method. The measuring head’s precision dosing feature produces a drop with defined volume. Two diodes with an accurately adjusted spa­cing illuminate the drop from above. A camera monitors the reflected light points, the spacing of which correlates to the contact angle. By measuring from above, surfaces in depres­sions or concave samples can be analyzed. Instruments with this patented measuring method can be obtained only from us.

The easy fitting of the module enables a rapid changeover between top view distance measurement and conventional contact angle measurement from the side.

The following are included in the scope of supply:

  • Precision dosing unit for producing accurate drop volumes
  • High-quality optical components and high-resolution camera
  • Pre-prepared measuring procedures in the software for rapid results

CP31 – Calibration set for the Top View Analyzer – TVA100

CP31 – Calibration set for the Top View Analyzer – TVA100

The calibration set CP31 comprises stainless steel balls with accurately defined radii and a correspondingly accurate surface curvature. The balls serve as models for spherically curved drop surfaces for checking  the reliability of the optical contact angle measurement using the top-view distance method. The 8 balls in the set cover the whole measuring range of the TVA100 in fine increments.

NE49 – Pipette tips for the dosing unit of the Top View Analyzer – TVA100

NE49 – Pipette tips for the dosing unit of the Top View Analyzer – TVA100

The dosing accessory NE49 contains 96 pipette tips for dosing highly accurate volumes for measuring the contact angle using the top view distance method.

Tools, aids and spare parts

To assist you when working with your instrument, we offer a diverse range of helpful accessories for preparing and carrying out your measurements and for cleaning after taking the measurement.

SP52 – Spare cartridges and syringes for pressurized double-dosing units

SP52 – Spare cartridges and syringes for pressurized dosing units

The set SP52 contains disposable parts for the dosing unit of our Mobile Surface Analyzer – MSA as well as the double-dosing unit DS3252 for our Drop Shape Analyzers:

  • 5 transparent cartridges with Luer-Lock connector for water
  • 5 brown cartridges with Luer-Lock connector for diiodomethane
  • 10 disposable syringes (1 mL) with Luer connector
  • 10 Luer-Lock adapters

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