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K20 – Force Tensiometer

The versatile semi-automatic tensiometer for quality control

The K20 Force Tensiometer is a stand-alone, semi-automatic instrument for all routine quality control tasks involving surface tension and interfacial tension. The instrument’s precision force sensor and the accurately shaped measuring probes ensure reliable results, while processor-controlled analyses based on measurement templates provide for user-independent results. The option of long-life battery operation without a computer enables the K20 to be used flexibly on site.

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  • Checking the aging status of transformer and other oils according to ASTM D 971 and IEC 62961
  • Checking for cleaning agent residues in the food industry and other areas
  • Surface tension validation for cleaning or wetting agents as well as other surfactants
  • Quality assurance of emulsifiers

MEASURING METHODS

  • Surface tension using the tensile force of a lamella underneath a ring
  • Interfacial tension using the tensile force of a lamella underneath a ring
  • Surface tension using the tensile force of a lamella which is stretched until it disrupts
  • Interfacial tension using the tensile force of a lamella which is stretched until it disrupts
  • Surface tension using the wetting force of a liquid at a platinum plate or rod
  • Interfacial tension using the wetting force of a liquid at a platinum plate or rod
  • Density determination of a liquid using the buoyancy of a probe immersed in the sample
  • Ageing check of transformer oils and other liquids using interfacial tension according to ASTM D 971
  • Ageing check of transformer oils and other liquids using interfacial tension according to IEC 62961

MEASURING RESULTS

  • Surface tension of a liquid
  • Interfacial tension between two liquids
  • Density of a liquid
  • Sample temperature

INSTRUMENT DIMENSIONS

Footprint 270 mm × 350 mm (W × D)
Height 430 mm
Weight (without accessories) 11 kg

TEMPERATURE MEASUREMENT

Range of temperature measurement -20 to 150 °C
Resolution 0.1 °C
Precision 0.2 °C
Accuracy 0.5 °C
Internal sensor
External sensor optional: sample vessel

POWER SUPPLY

Voltage 100 to 240 V
Power consumption 40 W
Frequency 47 to 63 Hz

ENVIRONMENT

Operating temperature 15 to 30 °C
Humidity without condensation

TEMPERATURE CONTROL

Type of temperature control liquid
Range of temperature control -10 to 130 °C
Flow-through thermostat optional

INTERFACES

PC USB 2.0
RS232
Auxiliary
Thermostat
Inert gas

HOUSING AND PERIPHERALS

Built-in bubble level yes
Built-in and software-controlled ionizer
Glass windshield doors
Windshield doors yes
Stainless steel measuring compartment
Control pad
Control panel integrated
Touch panel
Display 320 × 240 px

SAMPLE STAGE

Travel distance 90 mm
Simple platform yes
Temperature control jacket optional: 70 mm or 100 mm
Inverse CMC
Integrated sample stage yes

DRIVE

Resolution
Travel speed 2.4 to 14 mm/min
Type of motor DC motor

OPTICAL HEIGHT SENSOR

Resolution

FORCE MEASUREMENT

Maximum load 50 g
Resolution 100 µg
Precision 100 µg
Measurement rate 5 Hz
Adjustment optional:
automated
external weight
Locking mechanism

SOFTWARE

Software type LabDesk (optional)
Available software modules data logger (optional)

SURFACE FREE ENERGY OF SOLIDS

Results
Models

WASHBURN

Results
Resolution
Range
Type

WILHELMY CONTACT ANGLE

Minimum fiber diameter
Results
Range
Resolution
Type

WILHELMY PLATE

Results surface tension (SFT)
interfacial tension (IFT)
Range 1 to 999 mN/m
Resolution 0.1 mN/m

DU NOÜY RING

Results surface tension (SFT)
interfacial tension (IFT)
Range 1 to 999 mN/m
Resolution 0.01 mN/m
Correction method Harkins-Jordan
Zuidema-Waters
linear correction
no correction

LIQUID DENSITY

Liquid density range 1 to 2200 kg/m³
Resolution 1 kg/m³
Precision 3 kg/m³

SOLID DENSITY

Solid density range
Resolution
Precision

PENETRATION

Results

ROD

Results surface tension (SFT)
interfacial tension (IFT)
Range 1 to 999 mN/m
Resolution 0.2 mN/m

SEDIMENTATION

Results