HSWflow switches and flow transmitters are high-quality and reliable instruments for monitoring and regulating fluid and gaseous flows. Proven in many areas of industry: For example, in smelting, vacuum, sealing and sinter furnaces. In induction, welding, desalinization and rectifier facilities. HSW offers solutions for water treatment, heat changers, compressors, turbines, machine tools, laser appliances, X-ray equipment, and many more.
Especially versatile! Especially reliable! Especially inexpensive!
Reliable piston measuring principle – ideal for low switching points
The DW-K has been developed e.g. for the monitoring of coolant recirculation systems with low flow rates. Compact and ideal for switching points between 0.1 and 2.5 l/min. In accordance with the wishes and requirements of our customers. The principle: A special piston, fitted with permanent magnets, is held in a defined position by a spring. Depending on the rate of flow, the medium slides the piston against the strength of the spring. If the flow exceeds or falls short of the present switch point, the reed switch outside the medium is activated without contact via the permanent magnet. The construction is absolutely leakproof, and can easily be disassembled for any cleaning that needs to be done. The special piston that is pided into a measuring and guiding section combines precise switching with high reliability. Furthermore, this flow switch is insensitive to contamination and calcification.
- for the monitoring of lubricant, coolant and water circulation systems (gases on request).
- many inpidual connection solutions, material designs and switching ranges – can also be supplied in small quantities
- low switching points possible, large switching range
- requires little space, can easily be disassembled
- robust design, very reliable with a long service life
- low price
- Installation optional
- ideal for low switching points (between 0.1 and 2.5l/min)
Reliable monitoring! Easy to use!
Proven functional principle – consequently improved
DW-L offers a cost-effective and yet flexible option to monitor the flow. The basic version of the device is completely made of plastic. Special variants allow combining it with metals for different applications.
The device works according to the paddle principle. The paddle is fixed on a bearing and protrudes into the flow. A magnet is attached to the opposite side. A second, external magnet repels the paddle magnet. This produces a restoring force. This force may be set by changing the distance between the magnets by means of a screw so that the switching point of the device can be adjusted easily and precisely. A reed switch fixed to the outside is actuated contact-free by means of the magnet on the pendulum.
- Plastic version – no corrosion
- Easy adjustment of the switching point by means of set screw
- No spring – always the same restoring force
- Low pressure loss
- Different versions, easy adaptation to different requirements
- Very favorable price
Very versatile! Very safe to use!
Problem-free measuring method
The DW-R device type has proven itself to be a simple, reliable and cost-effective solution for the monitoring of flows in pipelines. Special versions with regard to materials, switching behavior and/or switching points, connection variants can be supplied on request. Contact us.
The DW-R model series functions very reliably in accordance with the dynamic pressure principle. If the flowing medium meets the circular pressure plate at the end of the pendulum, the pendulum system is moved. The pendulum system is supported by a pre-stressed leaf spring so that it can be swiveled without friction. A permanentmagnet at the end of the pendulum system operates a movable reed contract (protective gas contact). This switching unit is located outside the medium.
- pided structure, upper part and pendulum system fixed to the pipe part, ensuring that cleaning can be done easily and quickly – without adjustment
- simple exchangeability of the entire pendulum system
- Pendulum system available as a standard feature in stainless steel
- Function independent of pressure
- low pressure loss
- simple, reliable and costeffective flow switch
- insensitive to polluted media and calcification (except magnetic particles)
Reliable monitoring! Easy to use!
Proven measuring method
Flowswitch with adjustable switching point and optical switching display using glow lamp. The DW-N is based on the extremely reliable way deflection system. The pendulum system with the pressure plate (deflector) is moved by the flowing medium against the strength of a spring. A metal bellow seals the system from the medium to the measuring and display part. The movement transmission is done by force. A micro-switch arranged in the measuring part and a control lamp are activated. Corresponding switching processes are triggered by this micro-switch.
If the T-part of the DW-N device types is affected by calcification, debris or dirt, there is a message ‘no throughflow’. This means that it is virtually impossible for the system to stop in a position in which flow is indicated but where there is none.
- simple adjustment of the switching points in accordance with small scale
- Compulsory movement transmission to the micro-switch
- hermetic separation of the medium from the micro-switch using the bellows
- insensitive to pollution and magnet fields
- high electrical resilience
- maximum operating reliability and serviceability
- can be supplied for all flow directions and installation positions
- also available in Ex-version
- Version with two switches is available
