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sita Clean Line ST 表面張力儀

  • Measuring the Surface Tension Inline
     
     
    Process Monitioring of Surfcae Tension
    The Process Tensiometer SITA clean line ST continually and automatically measures the surface tension of process liquids used in the parts cleaning industry, surface technology, semiconductor and photovoltaic industry as well as in the chemical industry.
    The parameter surface tension, and thus the concentration of surface-active agents like surfactants, wetting agents and solvents, are measured and documented inline. Connected to the plant control, the SITA clean line ST measuring system carries out an automatic dosing of active agents according to the consumption.
     
     
    Product description 
     
     
    The Process Tensiometer SITA clean line ST continually and automatically measures the surface tension of process fluids used in the parts cleaning industry, surface technology, semiconductor and photovoltaic industry, as well as the chemical industry.
     
    The process parameter surface tension, and thus the concentration of surface-active agents like surfactants, wetting agents and solvents, are measured and documented inline. Connected to the plant control, the SITA clean line ST measuring system carries out an automatic dosing of active agents according to the consumption.
     
    The Process Tensiometer SITA clean line ST works fully automated, including:
    - handling of process liquid,
    - self cleaning function,
    - calibration of surface tension senor and
    - self diagnostic including error indication and logging.

    The process liquid sample is either lead back into the process again or rejected. No further equipment is necessary except of a tap water supply.

    Used with an industrial PC or an SPS with touch panel, the central control unit of the SITA clean line CC allows process-specific system solutions to be realized.
     
    SITA application engineers develop an optimal and customized SITA clean line system solution based on an analysis of your process and plant.
     
    ADVANTAGES
     
    - Quality assurance and documentation of the process development
    - automatic dosing of surface active agents according to the consumption
    - highest product quality through controlled process management
    - process solution for high process reliability
    - less cleaning agent consumption, environmental protection, cost reduction through process optimization
     
     
    Measurement Principle
     
    Like all SITA Tensionmenters, the SITA clean line ST process measuring device is based on the bubble pressure method to measure the dynamic surface tension in liquids. For this purpose, an air stream is lead into the sample liquid through a capillary which is especially developed for process use.
    The bubble that is formed at the end of the capillary continually expands its surface area. When the bubble radius reaches its minimum, the bubble pressure rises until reaching its maximum value. The surface tension is then calculated by determining the difference between the pressure maximum and minimum values.
     
     
    Application
     
    Continual monitoring and dosage according to the consumption:
     
    - Cleaning agent component surfactant in baths of industrial parts cleaning of companies operating in the field of mechanical engineering, automobile industry, electrical engineering and microelectronics
    - IPA-Concentration in texturing baths for silicon-wafers of photovoltaic industry
    - Wetting agent concentration of developer solutions for lithography processes of the semiconductor industry

    Practical example: automatic cleaning agent dosing before coating automotive pistons
     
    High cleanliness standards of automotive piston surfaces before coating with an anti-friction-layer require a management of the cleaning agent concentration within pre-determined limit values.
     
    The system solution SITA clean line ST continually monitors the cleaning agent components and ensures their dosage according to the consumption. Thus, a depletion or an overdose of cleaning agent can be avoided guaranteeing an optimal cleaning quality. The process reliability can be sustainably increased as well as the efficiency through to a reduction of cleaning agent.
     
     
    Technical Data
    Surface Tension
    Measuring range
    10...100 mN/m (dyn/cm)
    Resolution
    0.1 mN/m (dyn/cm)
    Bubble Lifetime
    Controlled range
    15...15,000 ms
    Resolution
    10 ms
    Sample Temperature
    Measuring range
    0...80 °C
    Resolution
    0.1 K
    General Data
    Housing
    Stailess steel (1,4301)
    Dimensions (W x H x D)
    480 x 480 x 170mm
    Weight
    ca. 23kg
    Acceptable Surrounding Temperature
    10…40°C
    Liquid Tangent Materials
    Metal vessel type
    Stainless steel (V2A & V4A), PTFE, FKM (viton), PEEK, PU, PA
    Glass vessel type
    Stainless steel (1,4401, 1,4408, 1,457l), borosilicate glass, PTFE, FKM (viton), PEEK
    Interfaces
    Operational Voltage
    110 … 240 V, 50 … 60 Hz, maximum 350 W
    Serial Interface (Service)
    RS323, 9 pin SUB-D
    Remote Maintenance
    Modem, analogue
    Signals
    Error / Interruption, exceeding
    Measurement request
    Access for isolated contact
    Current Interfaces
    Surface Tension 0.1…100 mN/m: 4…20 mA
    Fluidic connections
    Water supply
    2 … 6 bar, G ¼” inner span (10… 80° C)
    Sample supply
    1 … 6 bar, G ¼” inner span (10 … 80° C)
    Water & Sample drain
    tube fitting
 

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