Georg Fischer 2551 Specifications

Signet 2551 Magmeter Flow Sensor

T

Available in a variety of wetted materials and ideal

for pipe sizes up to DN900 (36 in.)

Features

• Test certifi cate included for -X0, -X1

• Patented Magmeter technology*

• No moving parts

• Bi-directional fl ow

• 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

The Signet 2551 Magmeter is an insertion style
magnetic fl ow sensor that features no moving parts.
The patented* sensor design is available in corrosion­resistant 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 fi ttings, sensor alignment and insertion depth
is automatic. These versatile, simple-to-install sensors
deliver accurate fl ow 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 o er 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 fl ow 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 benefi t is the
empty pipe detection which features a zero fl ow 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 fl ow using the
display or the 3-0252 Confi guration 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. Also, the display contains multi-languages
with English, Spanish, German, French, Italian and
Portuguese menu options.

• 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

MEASURING EQUIPMEN

77CJ

(3-2551-PX-XX

Applications

version only)

• 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

* U.S. Patent No: 7,055,396 B1

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Specifi cations

General

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

O-rings FPM (standard)

Case PBT
Display Window Polyamide (transparent nylon)
Protection Rating NEMA 4X/IP65

Electrical

Power Requirements 4 to 20 mA 24 VDC ±10%, regulated, 22.1 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)

Frequency Output Output Modes Freq., or Mirror Relay (display version only)

Digital (S

3

L) Output Serial ASCII, TTL level 9600 bps

Relay Specifi cations

#1, #2 Type Mechanical SPDT
Rating 5 A @ 30 VDC max., 5 A @ 250 VDC max.
#3 Type Solid State

Hysteresis User adjustable for exiting alarm condition
Alarm On Trigger Delay Adjustable (0 to 9999.9 sec.)
Relay Modes O , Low, High, Window, and Proportional Pulse
Relay Source Flow Rate, Resettable Totalizer
Error Condition Selectable; Fail Open or Closed

Display

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

Maximum Operating Pressure 10.3 bar @ 25 °C 150 psi @ 77 °F

Shipping Weight

Standards and Approvals

See Temperature and Pressure graphs for more information.

-P0, -P1, -P2: PP/316L SS

-T0, -T1, -T2: PVDF/Titanium

-V0, -V1, -V2: PVDF/Hastelloy-C

EPR (EPDM), FFPM (optional)

Frequency
Digital (S

3

L) 5 to 6.5 VDC, 15 mA max.

5 to 24 VDC ±10%, regulated, 15 mA max.

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

Max. Pull-up Voltage 30 VDC
Max. Current Sink 50 mA, current limited
Maximum Cable 300 m (1000 ft)
Compatible with Signet Model 8550, 8900, 9900, 9900-1BC

Compatible with Model Signet 8900 controller

50 mA @ 30 VDC, 50 mA @ 42 VAC

Media 0 °C to 85 °C 32 °F to 185 °F

1.4 bar @ 85 °C 20 psi @ 185 °F

0.680 kg 1.50 lb

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

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