GF Signet 3-2551 Magmeter Insertion Electromagnetic Flow Sensor
Overview
GF Signet 3-2551 Magmeter is an insertion-style electromagnetic flow sensor built with no moving parts, engineered for long-term reliability with minimal maintenance in chemical, water, and industrial process applications. Manufactured in wetted material combinations of polypropylene with 316L stainless steel, PVDF with Hastelloy-C, or PVDF with Titanium, the 3-2551 installs quickly into GF’s comprehensive line of flow fittings and delivers accurate, repeatable flow measurement across an exceptionally wide pipe size range of DN15 to DN900 (½ inch to 36 inches).
As the official authorized partner and exclusive regional representative for Georg Fischer, Seven Star LLC proudly supplies the GF Signet 3-2551 Magmeter and the complete GF Signet instrumentation range to water treatment plants, chemical processors, and industrial facilities across Oman and the wider GCC. Engineers and procurement teams in Muscat, Sohar, and Salalah rely on Seven Star LLC for genuine GF Signet flow sensors backed by manufacturer documentation, calibration support, and local technical guidance for fitting and range selection.
Measurement Principle
The GF Signet 3-2551 operates on Faraday’s law of electromagnetic induction: as conductive liquid flows past the sensor’s electrodes, a magnetic field generated within the sensor body induces a voltage proportional to the fluid’s velocity. This voltage signal is processed by the sensor electronics into a flow-rate output, requiring only that the process fluid meet a minimum conductivity of 20 µS/cm and that the pipe run full at the point of measurement. Because the electromagnetic method does not depend on differential pressure or a rotating element, the 3-2551 measures flow with a linearity of ±1% of reading plus 0.01 m/s and repeatability of ±0.5% of reading at 25°C across a velocity range of 0.05 to 10 m/s.
With no moving parts in the flow stream, the sensor is immune to wear from abrasive or fibrous media and avoids the fouling and mechanical failure modes common to paddlewheel and turbine sensors. The practical consequences are significant for plant operators: there is no pressure drop across the measurement point, no rotor to jam or wear out, and no recalibration drift from bearing degradation. The 3-2551 also includes empty pipe detection, which forces a zero-flow output whenever the electrodes are not fully wetted, preventing false readings during pipe draining or air-entrainment events.
Engineering Design of the GF Signet 3-2551
The GF Signet 3-2551 sensor body is available in three sensor types matched to pipe size: -X0 for ½ to 4 inch (DN15 to DN100), -X1 for 5 to 8 inch (DN125 to DN200), and -X2 for 10 to 36 inch (DN250 to DN900) pipe, each engineered for automatic alignment and insertion depth when installed with a GF Signet installation fitting. The enclosure carries a NEMA 4X / IP65 protection rating with a PBT case and polyamide display window, suitable for outdoor and washdown environments, and the sensor terminates in a 4-terminal connector accepting 16 to 22 AWG conductors for power and signal wiring.
Electrical output is selectable between a traditional 2-wire 4-20 mA passive loop (2551-XX-12, requiring 24 VDC ±10% external loop power), or a frequency/digital (S3L) output (2551-XX-11) compatible with GF Signet’s 8900, 9900, 9900-1BC, and 9950 flow instruments. A directional arrow on the sensor body must point downstream for correct operation, and the yellow housing can be reversed to orient the cable ports for the installation geometry, with a supplied liquid-tight connector sealing the cable entry against moisture ingress. The optional display version adds a 2×16 character LCD with permanent and resettable totalizers and up to three relay outputs for local alarm or control functions.
Key Features
Specifying the GF Signet 3-2551 for a project means choosing a Magmeter that combines a proven electromagnetic sensing principle with corrosion-resistant construction suited to demanding chemical and water applications:
- No moving parts in the wetted flow path, eliminating mechanical wear, jamming, and the recalibration drift typical of paddlewheel and turbine flow sensors.
- Wide pipe size coverage from DN15 to DN900 (½ inch to 36 inches) using a single sensor family across three body sizes.
- Corrosion-resistant wetted materials in polypropylene/316L stainless steel, PVDF/Hastelloy-C, or PVDF/Titanium for compatibility with aggressive chemical and saline media.
- Empty pipe detection that automatically forces a zero-flow output when the electrodes are not fully wetted, preventing false readings.
- Bi-directional flow measurement with selectable 4-20 mA, frequency, or digital (S3L) output for direct integration into PLC, SCADA, or GF Signet flow instrumentation.
- NEMA 4X / IP65-rated enclosure suitable for outdoor and washdown industrial environments without additional protective housings.
- Linearity of ±1% of reading and repeatability of ±0.5% of reading at 25°C, providing dependable accuracy for billing, dosing, and process control applications.
- Optional multi-language LCD display with permanent and resettable totalizers, supporting English, Spanish, German, French, Italian, and Portuguese menus.
Industrial Applications
The GF Signet 3-2551 Magmeter is widely deployed across chemical processing, water and wastewater treatment, desalination pretreatment, HVAC chilled water loops, and industrial water distribution networks where accurate, low-maintenance flow measurement is essential to plant operation. The GF Signet 3-2551’s corrosion-resistant wetted materials also make it a preferred choice for chemical dosing skids, scrubber control systems, neutralization processes, and commercial pool and aquarium filtration monitoring, where debris and aggressive cleaning chemicals would quickly foul a mechanical flow sensor.
As the officially authorized partner for Georg Fischer, Seven Star LLC distributes the 3-2551 Magmeter to municipal utilities, industrial water treatment operators, and process plants throughout the Sultanate of Oman and the broader GCC, including the growing industrial and desalination infrastructure around Sohar and Salalah. Local technical support for fitting selection, K-factor configuration, and calibration data, combined with genuine GF Signet documentation, makes Seven Star LLC the practical regional source for plant engineers specifying reliable electromagnetic flow measurement.
Technical Specifications
Engineers comparing the GF Signet 3-2551 against other insertion sensors can reference the table below, which summarizes the key technical parameters of the GF Signet 3-2551 Magmeter insertion flow sensor:
| Parameter | Specification |
|---|---|
| Model | GF Signet 3-2551 Magmeter |
| Sensor type | Insertion-style electromagnetic flow sensor |
| Pipe size range | DN15 to DN900 (½ in. to 36 in.) |
| Flow velocity range | 0.05 to 10 m/s (0.15 to 33 ft/s) |
| Linearity | ±1% of reading plus 0.01 m/s |
| Repeatability | ±0.5% of reading @ 25°C (77°F) |
| Minimum conductivity | 20 µS/cm |
| Wetted materials | PP/316L SS, PVDF/Titanium, or PVDF/Hastelloy-C |
| Output options | 4-20 mA loop, Frequency, or Digital (S3L) |
| Power requirements (4-20 mA) | 21.6 to 26.4 VDC, 22.1 mA max. |
| Enclosure rating | NEMA 4X / IP65 (with cap installed) |
| Operating temperature (media) | 0°C to 85°C (32°F to 185°F) |
| Maximum operating pressure | 10.3 bar @ 25°C (150 psi @ 77°F) |
| Approvals | CE, FCC, UL/CUL, NSF (PP versions), RoHS compliant |
Request a Quote for GF Signet 3-2551 Magmeter Insertion Electromagnetic Flow Sensor
Plant engineers and procurement teams across Oman and the GCC can request a formal quotation for the GF Signet 3-2551 Magmeter directly from Seven Star LLC, with fitting selection support, technical datasheets, and calibration data provided alongside every order. As the authorized partner for Georg Fischer in Oman and the GCC, Seven Star LLC maintains regional stock and works directly with GF’s engineering resources to support custom sensor body, output, and display configurations for water and process flow measurement projects. Contact the Seven Star LLC instrumentation division today to discuss your electromagnetic flow measurement requirements and receive a competitive, locally supported quotation.
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