Monitoring the Process Parameter Surface Tension

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.

Like all SITA Tensiometers, the SITA clean line ST process measuring device is based on the bubble pressure method to measure the dynamic surface tension in liquids. Therefore, as it can be seen on the picture, an air stream is lead into the sample liquid through a robust capillary and the pressure development necessary for the bubble generation is measured. (more information …)

Continual monitoring and dosage according to the consumption:

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.

Here you can find further application examples [..]