Electricity and Control July 2020

COVER ARTICLE

Fire suppression systems – Reliability is in the detail

T he firefighting industry covers a variety of applications in industrial, commercial and residential markets. It makes sense to take advantage of WIKA’s large product portfolio spanning pressure, temperature, level, flow and force measurement for any fire suppression system, wheth- er it is water- foam- or gas-based.

eration is non-contact, free from wear and needs no power supply.

Electromagnetic flow meter, Model FLC-2100F

Wika’s comprehensive portfolio of electromagnetic flow meters, which are based on the Faraday principle, includes high quality sensors and converters suitable for many different applications.

Bourdon tube pressure gauge with electronic pressure switch, Model PGS25

The robust model PGS25 switchGAUGE is a combination of a Bourdon tube pres- sure gauge and a pressure switch. It offers the usual analogue display, which enables reading the process pressure on site, and the possibility to switch up to two electrical signals.

The FLC-2100F is one example: a special version with Victaulic ® connection for increasing safety, ensuring relia- bility and maximising efficiency in fire-fighting systems.

Needle valve and multiport valve, Models IV10 & IV11 Needle valves and multiport valves separate the process from measuring instruments such as pressure gauges, switches or transmitters. Already in the stand- ard version, the multiport valve is

OEM compact pressure switch with settable hysteresis, Model PSM02 Model PSM02 screw-in pressure switches in a diaphragm or piston variant open or close a circuit, depending on whether the pressure is dropping or rising. Two adjustment screws enable easy and convenient on-site setting of the required switch point and hysteresis. Model PSM02 mechanical pressure switches are employed wherever compressed air, neutral and self-lubricating fluids or neutral gases are used and a precisely set hysteresis is needed. Bimetals form the basis of the WIKA TFS35 temperature switch. Temperature sensing is carried out by a bimetal disc, which snaps over when the nominal switching temperature is reached. On cooling down to the reset switching tem- perature, the temperature switch returns to its original state. Industrial float switch, Model FLS A float with a permanent magnet moves reliably along with the liquid level on a guide tube. With- in the guide tube a reed contact is fitted, which is energised by the approach of the float magnet. By using a magnet and reed contact the switching op- Bimetal temperature switch, Model TFS35

equipped with two additional connections. These can be used either as vent connections or for the connection of additional instruments.

Ball valve, Model BV The simple and robust design, with a safety factor of 4:1, makes model BV ball valves suitable for a wide spectrum of use. For appli- cations with liquid or gaseous me- dia, ball valves are recommended

due to easy cleaning of the straight-through internal bore. The valve design and the high-quality sealing materials en- sure high durability and tightness. As an option, WIKA offers the professional assembly of valves and pressure measuring instruments as well as ac- cessories to supply a ready-to-install solution, also known as a hook-up.

For more information contact WIKA Instruments (Pty) Ltd. Tel: +27 (0)11 621 0000, email: sales.za@wika.com visit: www.wika.co.za

Electricity + Control JULY 2020

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