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Type 2551 Magmeter; Blind Version
Frequency or Digital (S³L) output

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 stainless steel, PVDF with Hastelloy-C, or PVDF with Titanium. Utilising 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 inches), satisfying the requirements of many diverse applications.

Signet 2551 Magmeters offer many output options of frequency/digital (S3L) or 4 to 20 mA which are available on both the blind and display versions. The frequency or digital (S3L) 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 (S3L) 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 total values which can be seen on the display. Also, the display contains multi-languages with English, Spanish, German, French, Italian and Portuguese menu options.

  • Installs into pipe sizes: DN15 to DN900, 0.5 to 36 in
  • Operating range: 0.05 to 10 m/s, 0.15 to 33 ft/s

  • Max Pressure rating: PP 10.3 bar @ 25 °C, 150 psi @ 77 °F
  • Power Source: 
    Frequency: 5 to 24 VDC, 15 mA max.
    Digital (S³L): 5 to 6.5 VDC, 15 mA max.

  • Compatibility: 8900, 9900, 9900-1BC, 9950
  • *Only Signet installation fittings

Technical Details

Pipe Size
Add to Cart
3-2551-P0-11PP316L SS0.5 ‐ 4.0-X0MeasurementsCAD 159001105
3-2551-P1-11PP316L SS5.0 ‐ 8.0-X1Measurements 159001106
3-2551-P2-11PP316L SS10.0 ‐ 36.0-X2Measurements 159001107
3-2551-T0-11PVDFTitanium0.5 ‐ 4.0-X0Measurements 159001108
3-2551-T1-11PVDFTitanium5.0 ‐ 8.0-X1Measurements 159001109
3-2551-T2-11PVDFTitanium10.0 ‐ 36.0-X2Measurements 159001448
3-2551-V0-11PVDFHastelloy C0.5 ‐ 4.0-X0Measurements 159001257
3-2551-V1-11PVDFHastelloy C5.0 ‐ 8.0-X1Measurements 159001258
3-2551-V2-11PVDFHastelloy C10.0 ‐ 36.0-X2Measurements 159001450


  • Blind 4 to 20 mA, digital/frequency, relay output
  • Accurate measurement even in dirty liquids
  • Multi-language display menu available
  • Bi-directional flow
  • Installs into pipe sizes DN15 to DN900 (½ to 36 in.)
  • Corrosion resistant materials; PP or PVDF with SS, Hastelloy-C, or Titanium
  • Operating rate range 0.05 to 10 m/s (0.15 to 33 ft/s)

  • Patented Magmeter Technology
  • No moving parts
  • Empty pipe detection

Fields of Application:
  • Chemical Processing
  • Landfill Leachate

  • Commercial Pools, Spas and Aquariums

  • Water and Wastewater Monitoring

  • Metal Recovery

  • HVAC
  • Scrubber Control

  • Industrial Water Distribution

  • UL
  • RoHS Compliant
  • FCC
  • CE
  • CUL
  • China RoHS
  • NSF (3-2551-PX-XX version only)


Chinese manual - 2551 Blind Magmeter.pdfPDF1.46 MBDownload

Automation Made Easy.pdfPDF5.11 MBDownload

2551 CE Certificate.pdfPDF195.13 KBDownload

Temperature-Pressure Graphs.pdfPDF1.94 MBDownload
Signet 2551 Magmeter Flow Sensor (es).pdfPDF513.13 KBDownload
Signet 2551 Magmeter Flow Sensor (en).pdfPDF381.01 KBDownload

Instruction Manual
Portuguese manual - 2551 Blind Magmeter.pdfPDF1.33 MBDownload
Korean Manual - 2551 Blind Magmeter.pdfPDF3.31 MBDownload
Signet 2551 Display Magmeter (kr).pdfPDF3.35 MBDownload
Spanish manual - 2551 Blind Magmeter.pdfPDF1.24 MBDownload
French manual - 2551 Blind Magmeter.pdfPDF1.17 MBDownload
English manual - 2551 Blind Magmeter.pdfPDF1.18 MBDownload
German manual - 2551 Blind Magmeter.pdfPDF1.23 MBDownload
Italian manual - 2551 Blind Magmeter.pdfPDF1.24 MBDownload


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