Flow Meter Switch

[Manric Hock]

TheKOBOLD flowmeters and switches model VKG have a spring-loaded float, which slides within a cylindrical measuring tube and has an integral orifice which is believed to be unique. This and other design features means that it has for the first time become possible to create a flowmeter and switch which fully compensates for viscosity and to a large extent for density even with very low flows.

The float of these patented devices contain permanent magnets which actuate a potential free bistable reed contact mounted outside the flow, thus ensuring hermetic separation between the medium and the electrical contact system. The contact is embedded within a height-adjustable plastic housing to prevent damage to the contacts by mechanical action or aggressive atmospheres.

KOBOLD offers one of the most comprehensive and broad product lines for industrial instrumentation around the globe. We make meeting your industrial instrumentation needs easier and save time by eliminating the need to source your project with multiple providers.

Our large offering also allows us to offer you best fit for both you application and your budget. We aren't like other providers who might try to force a fit between their limited product line and your application. We can also provide the most economical technology suitable for the requirements.

KOBOLD KDG/KDF-9 compact micro flow meters with switches operate on the variable-area, or rotameter, float principle and are designed for the measurement of very low gas and liquid flows. Flow can be set exactly within the measuring range using the integral precision metering valve. All ranges on this rotameter can be optionally fitted with 1 adjustable inductive proximity switch which may be configured to identify certain flow conditions. Two flow switch types are available: 1.) Monostable: Switch activates momentarily as the stainless steel float passes by upon rising or falling flow or 2.) Bistable: Switch activates as the stainless steel float rises and remains active until the float falls past the switch on decreasing flow. All micro flow meters with a flow switch require the addition of a suitable external, NAMUR relay for operation.

We are a value-driven global manufacturer of process and control instrumentation. Since 1980, we have offered one of the most comprehensive lines worldwide; consisting of flow, level, pressure, temperature, and more.

KOBOLD is proud of our products, our people, and our processes that enable us to provide ideal application solutions and an unrivaled buying experience whether you are an end-user, OEM, or engineering firm.

Our products are well-known for their quality, reliability, longevity, Innovation, and long-term value. Backed by German engineering and US manufacturing, our solutions remain cost-competitive even though they are not mass-produced.

Many manufacturers with limited product lines force a fit between their product and your application, often leading to over-specified and over-priced recommendations. Our comprehensive product line allows us to tailor the product to your application, not the other way around. We approach your product selection with a focus of integrity, not profit.

The proven KOBOLD flowmeters and switches model SMV-... are based on the principle of the well-known float-type flowmeters except for the conventional tapering measuring tube. These patented instruments are provided instead with a cylindrical flow tube with conical slots around the periphery. This eliminates the usual problems of guiding the cylindrical float within a tapering measuring glass.

The novel design including the provision of an appropriately dimensioned annular gap of constant width between the float and the flow tube has enabled the sensitivity to dirt to be considerably reduced. The float comprises permanent magnets actuating a bistable reed contact external to the flow circuit, that is, the flowing medium is hermetically separated from the electrical contact.

In addition it is embedded in a height-adjustable switch housing, thus ensuring that the contact cannot be damaged even by an aggressive atmosphere. As the medium enters the instrument the float rises. Once its magnetic field reaches the contact tips of the reed switch the contact closes. As the flow increases the float rises further until it reaches its stop. This prevents the float from going beyond the contact range of the magnetic operating tube, that is, the contact remains closed, thus ensuring bistable switching.

With the models SMV-2... and SMV-3... the magnetic field also activates an external, that is, hermetically separated indicator, as a result of which flows are measured accurately even at high operating pressures. The magnetic field and the indicator are designed so as to ensure that the pointer follows even abrupt changes in flow rate.

The KOBOLD flowmeters and switches models SMW-.. and SMO-.. operate in the same way as the flowmeter model SMV-... The extra advantage of universal mounting has been added, that is, the direction of flow can be horizontal (model SMW-..) as well as from top to bottom (model SMO-..). This is achieved with a return spring.

KOBOLD Instruments has developed a wide variety of flow meters, flow regulators, flow indicators, flow switches, flow monitors, and flow sensors. Our flow instrumentation line offers a wide variety of technologies such as: variable area, ultrasonic, mass flow, thermal dispersion, turbine, electromagnetic, vortex, oval gear, positive displacement, differential pressure, Coriolis, helical or screw gear, rotameter, rotary piston, baffle plate, calorimetric, paddle wheel, and multi-parameter meters. Many models are offered with a wide variety of material choices, and some are available in exotic materials. With so many models and options, we can find a solution for most applications, even the most demanding ones. Our team of expert engineers is always here for you to help you find your KOBOLD solution.

KOBOLD offers a variety of flow sensors that can directly determine the flow rate of a gas or a liquid. We also offer many models of flow transmitters that can both monitor and control flow. Depending on the application variables and media specifications, different flow meters or flow monitors can be used. KOBOLD offers a wide variety of high-quality flow meters, from simple paddle-type switches to high-precision Coriolis mass flow meters. We also offer a wide variety of instrumentation that is well-suited for handling viscous media like oil. Some of our technologies for viscous media include: oval gear flow meters, helical gear flow meters, and special variable area flow meters. These technologies are characterized by a long service life and high efficiency. KOBOLD also offers a wide variety of technologies to meet the growing demand for instrumentation that does not contain moving parts which are subject to wear, such as: ultrasonic flow meters, magnetic-inductive flow meters, and vortex flow meters. We also offer portable and clamp-on instrumentation for short-term installations. We also offer models that can accommodate bi-directional measurement.

KOBOLD flow meters are used all over the world in industrial settings, including automated production and process control. Our instrumentation is found in reactive systems, where an action is quickly and automatically triggered when a certain flow rate is reached, and also in more passive systems that are built more for monitoring or counting the flow rate. Both types of systems offer a large variety of options. Our flow sensors can be equipped with corresponding displays that provide a direct reading of the flow rate. Instrumentation equipped with a transmitter can also be connected to central data systems via a BUS interface, providing real-time information from the flow meters. KOBOLD offers a wide variety of instrumentation that is compatible with common communication protocols, such as HART, PROFIBUS, and Foundation Fieldbus.

KOBOLD flow instrumentation can be found providing dependable and lasting service in common application fields, such as: irrigation, oil and gas, automotive, power generation, general manufacturing, machining, cement/aggregates, chemicals, petrochemicals, test measurement, laboratories, research and development, aerospace, HVAC, water, wastewater, building automation, pulp and paper, metals, mining, surface treatment, semiconductors, pumping, agriculture, marine, aviation, boilers, brewing, refrigeration, turbines, utilities, and welding.

With our wide variety of technology and materials, KOBOLD is able to accommodate most common liquid application media, such as: oils, lubricants, water, wastewater, chemicals, corrosives, abrasives, coolants, paints, coatings, adhesives, sealants, and fuels. Our instrumentation can also handle most types of gaseous media, such as: steam, clean gas, dirty gas, ammonia gas, combustible gas, compressed air, natural gas, and nitrogen flow.

KOBOLD and its affiliate companies have been and continue to be leaders in the field of industrial measuring and control equipment. Some of our products have set the bar in the industry, helping to shape the field of industrial instrumentation into what it is today. Always on the leading edge, we offer a comprehensive portfolio of reliable instrumentation that is found in a vast array of applications all over the world. Our technologies offer a solution oriented way to control the most diverse variables.

Our years of experience and our excellence in customer service and technical support have built our industry reputation as the partner of choice. We believe in serving and supporting our customers and our products and have made customer service a priority. Our expert engineers are always available during business hours to help you choose your KOBOLD solution, and their decades of experience are an asset that we are proud of. We are here to help you develop and select the best solution for your system, and eliminate the challenges that can come in selecting the most optimal and economical equipment for your application.

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