Request Form0

Type 2551 Magmeter; Display Version with relays
Current output (4 to 20 mA)

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: 4 to 20mA, 21.6 to 26.4 VDC, 22.1mA max
    Aux Power for relays, 9 to 24 VDC, 0.4A max
  • *Only Signet installation fittings

Technical Details

Pipe Size
Add to Cart
3-2551-P0-22PP316L SS1 ‐ 4-X0MeasurementsCAD 159001273
3-2551-P1-22PP316L SS5 ‐ 8-X1MeasurementsCAD 159001274
3-2551-P2-22PP316L SS10 ‐ 36-X2MeasurementsCAD 159001438
3-2551-T0-22PVDFTitanium1 ‐ 4-X0MeasurementsCAD 159001439
3-2551-T1-22PVDFTitanium5 ‐ 8-X1MeasurementsCAD 159001440
3-2551-T2-22PVDFTitanium10 ‐ 36-X2MeasurementsCAD 159001455
3-2551-V0-22PVDFHastelloy C1 ‐ 4-X0MeasurementsCAD 159001275
3-2551-V1-22PVDFHastelloy C5 ‐ 8-X1MeasurementsCAD 159001276
3-2551-V2-22PVDFHastelloy C10 ‐ 36-X2MeasurementsCAD 159001457


  • 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
Korean Manual - 2551 Blind Magmeter.pdfPDF3.31 MBDownload
Signet 2551 Display Magmeter (kr).pdfPDF3.35 MBDownload
Signet 2551 Display Magmeter (pt).pdfPDF3.43 MBDownload
Signet 2551 Display Magmeter (de).pdfPDF3.32 MBDownload
Signet 2551 Display Magmeter (es).pdfPDF3.2 MBDownload
Signet 2551 Display Magmeter (en).pdfPDF3.28 MBDownload
Signet 2551 Display Magmeter (it).pdfPDF3.37 MBDownload
Signet 2551 Display Magmeter (fr).pdfPDF3.32 MBDownload
Signet 2551 Display Magmeter (cn).pdfPDF4.11 MBDownload


Quick Request