Positive Displacement Flow Meter & Switches

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Positive Displacement Flow Meter and Switches

Positive displacement flow meters measure the volume of liquids passing through the meter by trapping successive volumes in discrete chambers. This method ensures highly accurate and repeatable measurements, making these meters ideal for precise quantification of flow rates. Their design allows for measurement of viscous liquids.

The strength of positive displacement flow meters lies in their ability to maintain accuracy over a wide range of flow rates and viscosities, without being significantly affected by changes in the liquid properties. They are particularly suited for applications where precise volumetric control is critical, including the pharmaceutical, food and beverage, and oil and gas sectors. Despite their mechanical nature, modern designs have evolved to minimize maintenance needs, ensuring long-term reliability and performance.

DOE - OEM Oval Gear Flow Meter

Measuring Range

0.14...9.5 GPH to 16...634 GPH

Process Connection/Type

1/8"...1/2" NPT Thread, G1/8...G1/2

DON - Positive-Displacement Flow Meters

Flow Ranges

0.13...9.5 GPH to 40...660 GPM

Line Sizes

1/8"...4"

Fittings

NPT or BSP Threaded, ANSI or DIN Flanged

Max. Operating Temperature

Up to 300 °F (Output Option Dependent)

Media Category

Liquid

DON-H - Oval Gear Flow Meter for High Pressures

Measuring Range

0.13…9.5 GPH to 0.26…10.6 GPM

Process Connection/Type

1/8"... 1/2" NPT Thread, G1/8...G1/2

Maximum Pressure

5800 PSIG

Maximum Media Temperature

Up to 250 °F (output option dependent)

Housing/Rotor Material

Stainless Steel

Media Category

Liquid

OME - Helical Gear Flow Meter

Measuring Range

0.027...2.7 GPM to 0.9...90 GPM

OVZ - Economical Oval-Gear Flow Meter for Oils

Measuring Range

0.08...2.1 GPM to 0.42...10.6 GPM

Fittings

¼"...¾" NPT, G¼...G¾ Threads

Body Material

POM, Aluminum

Cover Material

POM, PMMA, Aluminum, Polysulfone

O-Ring Material

NBR, FKM, or EPDM

Max. Pressure

Up to 580 PSIG w/Aluminum Body & Cover

Accuracy

± 2.5% FS

Media Temperature Range

14...176 °F

Media Viscosity Range

10...800 cSt

Media Category

Liquid

ZDM - Positive-Displacement Flow Meter

Measuring Range

0.0005...0.5 to 0.4...138 GPM

Fittings

3/8"...2" NPT Threads

-40...248 °F / -40...410 °F (Optional)

ABOUT KOBOLD USA

For decades, KOBOLD has been a world leader in process measurement and control solutions. We offer one of the industry’s broadest lines of sensors, switches and transmitters to measure and control flow, pressure, level and temperature. KOBOLD sensors and controls include:

Flow meters, flow switches and flow transmitters

Pressure gauges, pressure transmitters and pressure switches

Level switches, float switches, level gauges, level transducers, level indicators and level transmitters

Temperature switches, temperature gauges and temperature transmitters

Accessories, including magnetic filters, needle valves, regulating valves, control devices and relays

INDUSTRIAL MEASURING AND CONTROL EQUIPMENT

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 CUSTOMERS ARE OUR PRIORITY

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.

MEASURING, CONTROLLING AND AUTOMATING WITH KOBOLD

Our technical solutions can be easily integrated into a wide variety of systems in many industrial sectors. Thanks to internationally recognized BUS interfaces, most of our models can be easily adapted into already established automated processes. Our innovative instrumentation delivers that highest standards of service and can handle complex automated processes. Because our models are both sophisticated and easy to use, they are very popular among end users.

INSTRUMENTATION ABOVE AND BEYOND THE STANDARD

While KOBOLD offers a wide variety of instrumentation that meets most standard application needs, we are also able to meet extraordinary application needs that can be hard to find solutions for. We also offer other instrumentation that can handle excessive amounts of flow, pressure, and temperature. Our familiarity with exotic materials allows us to offer solutions for variables that are frequently hard to accommodate. Because we are the manufacturer, we also have the flexibility of being able to provide customized solutions in certain circumstances, based on the exact application needs.