Reliable process tensiometer:
- Fully automated measurement of the surface tension of process liquids
- Monitoring and controlling the surfactant/wetting agent concentration
- Continuous and discontinuous measurement (intervals or request)
- Automatic cleaning, callibration, monitproing
Advantages
- Quality assurance and documentation of the process development
- Enables automatic consumption-dependent dosing
- Highest process and product quality through controlled process management
- Less cleaning agent consumption, environmental protection, cost reduction through process optimisation
The process Tensiometer SITA clean line ST automatically measures the Surface tension of process liquids 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 the surface tension sensor
- 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.
SITA application engineers develop an optimal and customised SITA clean line system solution based on an analysis of your process and plant.
Continuous 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.
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.
| Surface tension | ||
|---|---|---|
| Measuring range | (10...100) mN/m (dyn/cm) | |
| Resolution | 0.1 mN/m (dyn/cm) | |
| Reproducibility | 0.5 mN/m | |
| General data | ||
|---|---|---|
| Housing | 480 mm x 480 mm x 170 mm (HxBxT), stainless steel (1.4301) | |
| Weight | ca. 23 kg | |
| Acceptable surrounding temperature | (10...40) °C | |
| Liquid tangent materials | ||
|---|---|---|
| Metal vessel type | Stainless steel (V2A & V4A), PTFE, FKM (viton), PEEK, PU, PA, PP | |
| Glass vessel type | Stainless steel (1,4401, 1,4408, 1,457l), borosilicate glass, PTFE, FKM (viton), PEEK | |
| Teflon (PTFE) type | Stainless steel, PTFE, PFA, PVDF, PEEK | |
| Electrical connections / interfaces | ||
|---|---|---|
| Operational voltage | (110...240) V, (50...60) Hz, max. 350 W | |
| Serial interface (Service) | RS232, 9-pol. SUB-D | |
| Remote maintenance | Modem, analogue | |
| Signals | Error/interruption, overrange and underrange surface tension, potential-free contacts | |
| Measurement request | Access for isolated contact | |
| Current interfaces |
Surface tension (0...100) mN/m: 4...20 mA Temperature 0...100 °C: 4...20 mA | |
Publications
- Akustische Messung und Tensiometrie kombiniert
- Reinigung voll unter Kontrolle - Kolbenreinigung automatisch überwachen und steuern
- Was sagt mir die Oberflächenspannung?
- Grenzwertbildung für hinreichende Bauteilsauberkeit
- Analyse und Überwachung von Tensidkonzentrationen. Sensoren zur Messung der dynamischen Oberflächenspannung in technischen Prozessen.
- Tensiometrie zum Überwachen der Reinigerkonzentration - Bauteilsauberkeit sichern, Wirtschaftlichkeit erhöhen
- Vorbehandlung von Kunststoffanbauteilen - Lackierfehler durch Wasserreste verhindern
- Stand der Technik und Entwicklungstendenzen zur Prozessführung in der industriellen Reinigung
References
SITA measuring devices have been successfully used in a variety of applications worldwide for over 25 years. The companies listed here represent just a small
selection of our extensive customer base.
Simply get in touch with us. You can find the contact details of our sales and application department under contact persons.
For support in your country, please see our international sales partners.
Alternatively, send an e-mail to info@sita-messtechnik.de, call us at +49 351 288 53-0 or send us a message using the contact form.