Signet 2551 Magmeter Flow Sensor

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 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 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.

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Signet 2551 Magmeter Features

  • Test certificate included for -X0, -X1
  • Patented Magmeter technology*
  • No moving parts
  • Bi-directional flow
  • Empty pipe detection
  • 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)
  • Accurate measurement even in dirty liquids
  • Polypropylene and PVDF retaining nuts standard, Valox optional
  • 4 to 20 mA, digital (S3L), frequency, relay output (Display only)
  • No pressure drop
  • Corrosion resistant materials; PP or PVDF with SS, Hastelloy-C, or Titanium
  • Multi-language display menu available


  • Chemical Processing
  • Water and Wastewater Monitoring
  • Metal Recovery and Landfi ll Leachate
  • Commercial Pools, Spas, and Aquariums
  • HVAC
  • Irrigation
  • Scrubber Control
  • Neutralization Systems
  • Industrial Water Distribution

Signet 2551 Magmeter Specifications

Operating Range 0.05 to 10 m/s 0.15 to 33 ft/s
Pipe Size Range DN15 to DN900 ½ to 36 in.
Linearity ± 1% reading plus 0.1% of full scale
Repeatability ±0.5% of reading @ 25 °C (77 °F)
Minimum Conductivity μS/cm
Wetted Materials
Sensor Body/Electrodes and Grounding Ring -P0, -P1, -P2: PP/316L SS
-T0, -T1, -T2: PVDF/Titanium
-V0, -V1, -V2: PVDF/Hastelloy-C
O-rings FKM (standard),
EPR (EPDM), FFKM (optional)
Case PBT
Display Window Polyamide (transparent nylon)
Protection Rating NEMA 4X/IP65
Power Requirements 4 to 20 mA VDC ±10%, regulated, 22.1 mA max.
Frequency to 24 VDC ±10%, regulated, 15 mA max.
Digital (S3L) to 6.5 VDC, 15 mA max.
Auxiliary (only required for units with relays) to 24 VDC, 0.4 A max.
Reverse Polarity and Short Circuit Protected
Current Output 4 to 20 mA Loop Accuracy 32 μA max. error (25 °C @ 24 VDC)
Isolation Low voltage < 48 VAC/DC from electrodes and auxiliary power
Maximum Cable 300 m (1000 ft)
Error condition 22.1 mA
Max. Loop Resistance 300 Ω
Compatible with PLC, PC or similar equipment
4 to 20 mA load needed
Frequency Output Output Modes Freq., or Mirror Relay (display version only)
Max. Pull-up Voltage 30 VDC
Max. Current Sink 50 mA, current limited
Maximum Cable 300 m (1000 ft)
Compatible with Signet Model 8900, 9900, 9900-1BC, 9950
Digital (S3L) Output Serial ASCII, TTL level 9600 bps
Compatible with Model Signet 8900, 9900, 9950 and 0486
Relay Specifications
#1, #2 Type Mechanical SPDT
Rating 5 A @ 30 VDC max., 5 A @ 250 VDC max.
#3 Type Solid State
Rating 50 mA @ 30 VDC, 50 mA @ 42 VAC
Hysteresis User adjustable for exiting alarm condition
Alarm On Trigger Delay Adjustable (0 to 9999.9 sec.)
Relay Modes Off , Low, High, Window, and Proportional Pulse
Relay Source Flow Rate, Resettable Totalizer
Error Condition Selectable; Fail Open or Closed
Characters 2 x 16
Contrast User-set in four levels
Backlighting (only on relay versions) Requires external 9-24 VDC, 0.4 mA max.
Max. Temperature/Pressure Rating
Storage Temperature -20 °C  to 70 °C
Relative Humidity 0 to 95% (non-condensing)
Operating Temperature Ambient -10 °C to 70 °C
Media 0 °C to 85 °C
Maximum Operating Pressure 10.3 bar @ 25 °C
1.4 bar @ 85 °C
Shipping Weight
0.680 kg 1.50 lb
Standards and Approvals
CE, FCC, UL, CUL, NSF (3-2551-PX-XX version only)
RoHS compliant, China RoHS
NEMA 4X / IP65 Enclosure (with cap installed)
Manufactured under ISO 9001 for Quality and ISO 14001 for Environmental Management and OHSAS 18001 for Occupational Health and Safety

Download Datasheet: Signet 2551 Magmeter Flow Sensor

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