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SensoGate WA 131 Retractable Fitting

Universal, pneumatically operated retractable fitting with a modular design for simple controllers.

Based on the proven SensoGate modular design principle, the new WA 131 retractable fitting is ideal for applications which do not require completely automated control but which still require superior SensoGate technology.

Variable and Reasonably Priced
The development of the Ceramat WA150 fitted with a ceramic gasket for processes involving extreme applications and the SensoGate flagship WA 130 (H) complete Knick's retractable fitting program, each of them equipped to provide the right functionality for individual applications.

SensoGate WA 131 is ideal for automatic or semi-automatic connections to commercially available or customer-developed control units.

The new, low-priced SensoGate WA 131 models offer many advantages for applications which require that the sensor can be easily removed on site either for maintenance purposes or to be replaced.

This is also true wherever cleaning is necessary and can take place directly at the sensor lock-gate ­manually or triggered byremote controller.


All SensoGate WA131 fittings are also available as explosion-protected versions for use in hazardous areas.

The design is scalable to meet requirements; when placing an order, customers simply state the types of connections and functions they require on the retractable fitting.

Every design permits the sensor to be manually serviced or replaced. This can easily be done under process pressures as high as 10 bar. The sensor lock-gate supplied by Knick is thus designed precisely for your special needs; optionally either with or without limit switches, with or without a rinsing chamber inlet; Manual or pneumatic with simple snap-in connections for the control air.

And now a low-priced version in which the parts in contact with media are made from PP. If, for example, an additional media connection is required later on, then this can be retrofit very easily by simply replacing the corresponding module.

A switch from metal to plastic or a switch to electrodes with a store of liquid electrolyte is possible and one big advantage of the SensoGate modular design.

The patented lock-gate function (i.e., the reliable shut-off to the process even during movement) is always active. This also applies to the hygienic version, which is a unique design feature in the world market for retractable fittings.

Easy Maintenance
Compared to other devices, the manual sensor lock-gate, sophisticated down to the smallest detail, reduces the time needed to replace wear parts by as much as 70%.

This is also helped by our special installation tools. For example, the O-rings can be completely replaced in just a few minutes; the gaskets are easily accessible and can be exchanged very quickly. Design innovations also ensure that the O-rings have an extremely long service life.

The Materials
Today, conventional retractable fittings are available in a broad range of materials: PP, PEEK, PVC, PP, steel, Hastelloy, titanium etc.

Plastics frequently provide advantages to resist chemical stresses, but these have been out-weighed to some extent by the disadvantages of the designs. They are thermally unstable, tend to swell and therefore do not have enough dimensional stability.

In particular, immersion tubes made of plastic are greatly limited in terms of their application, cannot move after swelling and often malfunction prematurely.

In contrast, the plastic versions of the SensoGate are reinforced with carbon fiber. In addition to the chemical resistance of the reinforced PEEK, PVDF or PP, the calibration chamber and the immersion tube retain their shape even when exposed to higher temperatures.

The immersion tubes made of carbon-fiber-reinforced plastic are injection-molded rather than cut so as to avoid tool marks. The advantage of this method is that all the fibers remain covered by the surface. Cutting such fiber-reinforced plastics on a lathe would expose fibers and the resulting surface would be too rough for the O-rings to slide over.

Attractive in Every Way
The result of Knick's injection-molding is a straight pipe with a closed surface of excellent quality. The direct benefit for the customer is the minimal O-ring wear and the correspondingly long service life of the gaskets. At the same time these materials can also be used at a great cost advantage where until now serious chemical stress combined with high pressures and temperatures have required extremely expensive materials such as Hastelloy. In addition to the price there is another enormous advantage: the fiber-reinforced plastics used by Knick have thermal expansion characteristics similar to those of steel. There are no longer any pressure restrictions over the permissible temperature range, due to the division into pressurized components made of steel and process-wetted materials made of ­carbon-fiber-reinforced plastic. The pressure stability is the same at room temperature as it is at 120 / 140 °C.

Explosion Protection
Another benefit is the conductivity of plastic carbon-fiber-reinforced components­, especially for the use of SensoGate in hazardous areas. The probe guard made of conductive plastic prevents the electrodes from building up electrostatic charge and, in turn, distorting the measurements.
SensoGate is approved for operation in hazardous areas in accordance with qualifications II 1 GD c II.

Process Adaptation
SensoGate retractable fittings can be adapted to various processes with a steel flange 1.4571 DN 32 to DN 100, dairy-pipe screw joint DN 50 to DN 100, ANSI 316 1 1/2" to 3" flange and Ingold sockets or hygienic process connections. Other special adaptations – such as for flow-through vessels – are possible.

Hygienic and Safe
The hygienic SensoGate WA 131 H is EHEDG–certified. In contrast to other commercially-available fittings, this not only applies to the process-wetted parts but also to the rinsing chamber. This means that its suitability for unrestricted use in pharmaceutical and food applications has been certified. This also allows for validation in FDA-regulated production processes. The only part of the immersion tube which comes in contact with the process is that part which was previously sterilized in the rinsing chamber. In addition to sterility, it is also vital that the tube can be cleaned. The SensoGate fittings have turned the concept of mandatory rinsing into a reality; an integrated flow body directs the hot steam or rinsing liquid across all the surfaces to the foremost gasket. Another variant allows the process flange in the SensoGate to be moved which, in turn, enables greater immersion depth. The hygienic SensoGate versions are the only fittings on the market to offer hygienic design plus a genuine gate function. At no time – not even during probe movement – is there any contact between the process and the (possibly unhygienic) surroundings.

Unique Variety
The variety of the freely combinable materials, the modularity, and the quality of SensoGate retractable fittings is unique worldwide. There is not even anything approaching the degree of flexibility which this modular system for sensor lock-gates provides in the way materials and functionality can be so freely selected and interchanged: Plastic (PEEK, PVDF, PP) or metal (stainless steel, Hastelloy), designs for use with chemicals or hygienic applications, manual or pneumatic – optionally for liquid- or solid-polymer-electrolyte sensors, long or short immersion depths. The fitting adapts perfectly to every detail of the application and can even be adapted later on to changed conditions.

Made in Germany
Bucking the trend to outsource production, the fittings are manufactured, assembled and tested at Knick's own Berlin headquarters. This reflects our belief in keeping our core competencies in-house and in creating highly specialized areas of production which cannot be expected of suppliers on contract with such a consistent level of quality and flexibility.

With this production base, Knick is also able to respond to orders without delay. A special number is engraved on every component directly on the machine. This documents precisely and in detail which customer received which components. This unique traceability permits, for example, a test certificate to be supplied for each individual fitting on request, even years later.

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