Magmeter Flow Sensor 2551

Magmeter Flow Sensor 2551

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Insertion Magmeter Flow Sensor 2551

The Georg Fischer 2551 Magmeter is an insertion magnetic flow sensor that features no moving parts, 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. Utilizing the comprehensive line of Georg Fischer 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 applications.

Georg Fischer 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 Georg Fischer’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 3-0250 USB to Digital (S3L) Configuration / Diagnostic set-up 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 re-settable 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.

Magmeter flow sensor features:

  • 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
  • *Only Georg Fischer installation fittings



Operating Range 0.05 to 10 m/s 0.15 to 33 ft/s
Pipe Size Range DN15 to DN900 ½ in. to 36 in.
Linearity ± 1% reading plus 0.1% of full scale
Repeatability ±0.5% of reading @ 25 °C (77 °F)
Minimum Conductivity 20 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 24 VDC ±10%, regulated, 22.1 mA max.
Frequency 5 to 24 VDC ±10%, regulated, 15 mA max.
Digital (S3L) 5 to 6.5 VDC, 15 mA max.
Auxiliary (only required for units with relays) 9 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 Georg Fischer Model 8550, 8900, 9900, 9900-1BC, 9950
Digital (S3L) Output Serial ASCII, TTL level 9600 bps
Compatible with Model Georg Fischer 8900 controller, 9900, 9950, 0486 Profibus Concentrator
Relay Specifications
#1, #2 Type Mechanical SPDT
Rating 5 A @ 30 VDC max., 5 A @ 250 VDC max.
#3 Type Solid State
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 -4 °F to 158 °F
Relative Humidity 0 to 95% (non-condensing)
Operating Temperature Ambient -10 °C to 70 °C 14 °F to 158 °F
Media 0 °C to 85 °C 32 °F to 185 °F
Maximum Operating Pressure 10.3 bar @ 25 °C 150 psi @ 77 °F
1.4 bar @ 85 °C 20 psi @ 185 °F
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


Georg Fischer

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Additional information


3-2551-P0-42_Mag PPSS Disp 0.5-4" 4-20, 3-2551-P1-42_Mag PPSS Disp 5-8" 4-20, 3-2551-V0-42_Mag PVHA Disp 0.5-4" 4-20, 3-2551-V1-42_Mag PVHA Disp 5-8" 4-20, 3-2551-P2-41_Mag PPSS Disp 10-36" F/D, 3-2551-T0-41_Mag PVTI Disp 0.5-4" F/D, 3-2551-P2-21_Mag PPSS 10-36" F/D DRly, 3-2551-T0-21_Mag PVTI 0.5-4" F/D DRly, 3-2551-T1-21_Mag PVTI 5-8" F/D DRly, 3-2551-P2-22_Mag PPSS 10-36" 4-20 DRly, 3-2551-T0-22_Mag PVTI 0.5-4" 4-20 DRly, 3-2551-T1-22_Mag PVTI 5-8" 4-20 DRly, 3-2551-P2-42_Mag PPSS Disp 10-36" 4-20, 3-2551-T0-42_Mag PVTI Disp 0.5-4" 4-20, 3-2551-T1-42_Mag PVTI Disp 5-8" 4-20, 3-2551-P2_Mag PPSS Sensor 10-36", 3-2551-T2-11_Mag PVTI Blind 10-36" F/D, 3-2551-T2-12_Mag PVTI Blind 10-36" 4-20, 3-2551-V2-11_Mag PVHA Blind 10-36" F/D, 3-2551-V2-12_Mag PVHA Blind 10-36" 4-20, 3-2551-T2-22_Mag PVTI 10-36" 4-20 DRly, 3-2551-V2-22_Mag PVHA 10-36" 4-20 DRly, 3-2551-T2-42_Mag PVTI Disp 10-36" 4-20, 3-2551-V2-41_Mag PVHA Disp 10-36" F/D, 3-2551-V2-42_Mag PVHA Disp 10-36" 4-20


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