Overview
Georg Fischer is proud of it’s long history of success with roots going back more than 200 years when Johann Conrad Fischer laid the foundation. What began 1802 with a small copper smelting plant and development works for new alloys, has since developed to the global industrial concern as we know it today.
Towards the end of 19th century, the company first began with producing the long-standing malleable cast iron fittings, thereby creating the basis of today’s division GF Piping Systems. This day, it has become established on the market as a leading supplier of piping systems for the safe and reliable transport of liquids and gases. Despite the constant change, innovational strength and customer orientation remain the defining values for GF Piping Systems up to today.

Flow Sensor Products
Insertion Paddlewheel Sensors
Easy to install and offering proven, reliable performance, Paddlewheel flow sensors are available in a variety of materials for a wide range of pipe sizes and insertion configurations. The many material choices, which include PP, PVDF and stainless steel, make paddlewheels highly versatile and chemically compatible in many liquid process applications.
515 Rotor-X Paddlewheel Flow Sensor :
The Signet 2536 sensors are offered in a variety of materials for a wide range of pipe sizes and insertion configurations. The many material choices including PP and PVDF make this model highly versatile and chemically compatible to many liquid process solutions.
Sensors can be installed in DN15 to DN900 (½ to 36 in.) pipes (except the 2536 PVC versions, which can be installed in DN15 to DN100 (½ to 4 in.) pipes), using Signet’s comprehensive line of custom fittings. These custom fittings, which include tees, saddles, and weldolets, seat the sensor to the proper insertion depth into the process flow. The sensors are also offered in configurations for wet-tap installation requirements.
2536 Rotor-X Paddlewheel Flow Sensor
Signet 2536 Rotor-X Paddlewheel Flow Sensors offer exceptional value with little or no maintenance and has a process-ready open collector signal with a wide dynamic flow range of 0.1 to 6 m / s (0.3 to 20 ft / s). The Model 2536 has a process-ready open collector signal with a wide dynamic flow range of 0.1 to 6 m/s (0.3 to 20 ft/s). The sensor measures liquid flow rates in full pipes and can be used in low pressure systems.
The Signet 2536 sensors are offered in a variety of materials for a wide range of pipe sizes and insertion configurations. The many material choices including PP and PVDF make this model highly versatile and chemically compatible to many liquid process solutions.
Sensors can be installed in DN15 to DN900 (½ to 36 in.) pipes (except the 2536 PVC versions, which can be installed in DN15 to DN100 (½ to 4 in.) pipes), using Signet’s comprehensive line of custom fittings. These custom fittings, which include tees, saddles, and weldolets, seat the sensor to the proper insertion depth into the process flow. The sensors are also offered in configurations for wet-tap installation requirements.
525 Metalex Flow Sensor
The Signet 525 Metalex™ Paddlewheel Flow Sensor combines stainless steel construction with insertion paddlewheel technology.The 525 sensor requires little or no maintenance of any kind, with the exception of an occasional sensor/paddlewheel cleaning.
Signet products with limited shelf-life (e.g. pH, ORP, chlorine electrodes, calibration solutions; e.g. pH buff ers, turbidity standards or other solutions) are warranted out of box but not warranted against any damage, due to process or application failures (e.g. high temperature, chemical poisoning, dry-out) or mishandling (e.g. broken glass, damaged membrane, freezing and/or extreme temperatures).
2537 Paddlewheel Flow Sensor
The Signet 2537 Flow Sensor is the next generation in fluid measurement technology from the inventor of the original paddlewheel flowmeter.
The Signet 2537 Flowmeter is the next generation in fluid measurement technology from the inventor of the original paddlewheel flowmeter. This sensor is an improvement on what’s already an industry standard. It has the added functionality of various output options including fl ow switch, multi-functional pulse, digital (S3 L) or 4 to 20 mA. Additionally, it offers low flow, low power and high resolution and can be configured onsite directly through the built-in user interface.
2540 Stainless Steel High Performance Paddlewheel Flow Sensor
The Signet 2540 Paddlewheel Flow Sensor offers the strength and corrosion resistance of stainless steel for liquid applications with low velocity measurements
2540 Hot-Tap sensor specifications and limitations depend on the lowest maximum rating of the components associated with the system. For example, if a ball valve in the system is rated at a maximum 100 psi @ 175 °F, you must limit the entire system’s maximum pressure/temperature rating to 100 psi @ 175 °F. All higher maximum specifications MUST yield to the component with the lowest maximum specification.
Electromagnetic flow Sensors
2551 Magmeter Flow Sensor
The Signet 2551 Magmeter is an insertion style magnetic flow sensor that features no moving parts.
The Signet 2551 Magmeter is an insertion style magnetic flow sensor that features no moving parts. The patented* sensor design is available in corrosion-resistant materials to provide long-term reliability with minimal maintenance costs. Material options include PP with stainless steel, PVDF with Hastelloy-C, or PVDF with Titanium.
Utilizing the comprehensive line of Signet installation fittings, sensor alignment and insertion depth is automatic. These versatile, simple-to-install sensors deliver accurate flow measurement over a wide dynamic range in pipe sizes ranging from DN15 to DN900 (½ to 36 in.), satisfying the requirements of many diverse applications.

Signet 2551 Magmeters off er many output options of frequency/digital (S3 L) or 4 to 20 mA which are available on both the blind and display versions. The frequency or digital (S3 L) sensor output can be used with Signet’s extensive line of flow instruments while the 4 to 20 mA output can be used for a direct input to PLCs, chart recorders, etc. Both the 4 to 20 mA output and digital (S3 L) sensor interface is available for long distance signal transmission.
An additional benefit is the empty pipe detection which features a zero flow output when the sensors are not completely wetted. Also, the frequency output is bi-directional while the 4 to 20 mA output can be set for uni- or bi-directional flow using the display or the 3-0252 Configuration Tool which connects to PCs for programming capabilities.
In addition, the display version of the 2551 Magmeter is available with relays and features permanent and resettable totalizer values, which can be stored and seen on the display. The display also contains multi-languages in English, Spanish, German, French, Italian and Portuguese menu options.
2552 Metal Magmeter Flow Sensor
The GF 2552 Metal Magmeter from Georg Fischer features all-stainless steel construction. The PVDF nosepiece and FKM O-rings are the only other wetted materials. The 2552 installs quickly into standard 1¼ in. or 1½ in. pipe outlets, and is adjustable to fit pipes from DN50 to DN2550 (2 to 102 in.). Two sensor lengths allow maximum flexibility to accommodate a variety of hardware configurations, including ball valves for hot-tap installations
The Signet 2552 Metal Magmeter from Georg Fischer features all-stainless steel construction. The GF 3-0252 Configuration Tool is available to customize every performance feature in the 2552 so it can be adapted to the user’s application requirements.
2581 FlowtraMag® Meter
The GF 2581 FlowtraMag is a full-bore plastic PVC in line style magnetic flowmeter. The PVC body with Titanium or Hastelloy® C electrodes has no moving parts, and is two to three times lighter in weight compared to traditional metal magmeters on the market. It is designed for high accuracy flow measurement in short pipe runs, making it an ideal solution for industrial applications where performance and ease of use are important.
The FlowtraMag design is factory calibrated with certificate at ±1% of reading accuracy. It is offered in corrosion resistant materials to provide long-term reliability with minimal maintenance costs. The LED indicators show at-a-glance system status, including normal operation, zero flow and partially filled pipe detection.
The flow meter provides three different outputs; field selectable frequency or digital (S3 L) as well as analog 4 to 20 mA in both passive and active configuration. The GF Config Tool Bluetooth® app supports iOS and Android for simple on-the-fly user configuration with in with instantaneous flow reading.
These versatile, easy-to-install meters deliver accurate flow measurement in pipe sizes of DN25 (1 in.), DN40 (1.5 in.), DN50 (2 in.), DN80 (3 in.) and DN100 (4 in.), optimized for performance in short pipe runs often associated with final effluent lines, well heads and water treatment skids
3519 Flow Wet-Tap Valve
The Signet 3519 Flow Wet-Tap Valve serves as a unique interface between the installation fitting and the wet-tap style Signet 515 or 2536 Rotor-X flow sensor.
2100 Turbine Flow Sensor
Engineered specifically for small pipe diameter applications, the Signet 2100 Turbine Flow Sensor provides accurate readings in two flow ranges: 0.3 to 3.8 lpm and 3 to 38 lpm
2000 Micro Flow Sensor
The Signet 2000 Micro Flow Rotor Sensor is constructed of Polyphenylene Sulfide (PPS) which provides high material strength.
2507 Mini Flow Sensor
The Signet 2507 Mini Flow Rotor Sensor contains a free-running rotor that is driven by the fluid flow.
Ultrasonic Flowmeter
Whether it’s water or aggressive media, metal or plastic, low or high pressure and flow rates, clean or dirty media, the GF ultrasonic flow meters are suited for precise, non-contacting flow rate measurement across all sectors. They are easy to install and configure. For this reason, they are well suited for numerous applications – from industrial process technology and chemical processes with aggressive media to applications with ultrapure water in microelectronics or pharmaceutical industry. Metering processes in public swimming pools and cooling systems to industrial or municipal water and wastewater treatment systems.

- Ultrasonic Flowmeter GF U1000 V2
- Ultrasonic clamp-on flowmeter with integral design & digital communication options
- Ultrasonic Heatmeter GF U1000 V2
- Ultrasonic clamp-on heatmeter (HM) with integral design & digital communication
- Ultrasonic Doppler Flowmeter GF UD2100
- Ultrasonic clamp-on doppler flowmeter measurement for dirty media with digital communication & data logger
Ultrasonic Flowmeter GF PF220 V2
Portable ultrasonic clamp-on flowmeter
The Portaflow range brings simplicity to the non-invasive measurement of liquid flow. Portaflow offers the user quick and accurate flow measurement with its easy to follow menu and simple set up. Results can be achieved within minutes of opening the case. Compact, rugged and reliable, the Portaflow range has been designed to provide sustained performance in industrial environments.
The GF PF220 V2 and GF PF330 V2 Portable Ultrasonic Flowmeter range is designed for temporary or semi-stationary use. The GF PF330 V2 Heatmeter (HM) is additionally to an ultrasonic flowmeter equipped with Pt100 temperature sensors to calculate the energy of a heat exchanging system. Thus the device is able to work as a
heat meter / energy meter / BTU meter for temporary or semi-stationary use.
The flowmeter range enables enable easy, simple & accurate flow measurement on virtually any pipe. Including PVDF-ABS, PVC, PP, PE, PB-Instaflex, iron and steel pipes. Measurements can be viewed directly on-site with the large graphic display or optionally logged and exported to a PC for further analysis (GF PF330 V2 (HM) versions). One 4-20 mA output and three individually configurable pulse outputs enable easy integration into higher-level systems.
The ‘Clamp-On’ concept makes the installation of the sensors in running systems possible. The pipe does not have to be opened. Compact, rugged and reliable – the GF PF220 V2 and GF PF330 V2 (HM) portable ultrasonic flowmeters have been designed to provide sustained performance in industrial environments.
Other Article:
- Signet 2100 Turbine Flow Sensor
- Signet 3519 Flow Wet-Tap Valve
- Signet 2552 Metal Magmeter Flow Sensor
- Signet 2552 Metal Magmeter Flow Sensor
- Signet 2551 Magmeter Flow Sensor
- Signet 2551 Magmeter Flow Sensor
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