Signet 3-2551-XX-XX Magmeter Flow Sensors

2551 Magmeter Flow Sensor

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 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 3-0250 USB to Digital (S3L) Configuration/Diagnostic set-up tool which connects to PCs for programming capabilities.

Fields of Application:
  • Chemical Processing
  • Water and Wastewater Monitoring
  • Metal Recovery
  • Landfill Leachate
  • Commercial Pools, Spas and Aquariums
  • HVAC
  • Scrubber control
  • Neutralization Systems
  • Industrial Water Distribution
  • Patented Magmeter technology
  • No moving parts
  • Bi-directional flow
  • Empty pipe detection
  • Installs into pipe sizes DN15 to DN900 (½ to 36 in.)
  • Operating range: 0.05 to 10 m/s (0.15 to 33 ft/s)
  • Accurate measurement even in dirty liquids
  • Blind 4 to 20 mA, digital/frequency, relay output
  • No pressure drop
  • Corrosion-resistant materials; PP or PVDF with SS, Hastelloy-C, or Titanium
  • Multi-language display menu available
  • CE
  • UL
  • CUL
  • FCC
  • China RoHS
  • RoHS compliant
  • NSF (3-2551-PX-XX version only)
Operating Range0.05 to 10 m/s or 0.15 to 33 ft/s
Pipe Size RangeDN15 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 Conductivity20 µS/cm
Sensor Body/Electrodes and Grounding Ring-P0, -P1, -P2: PP/316L SS -T0, -T1, -T2: PVDF/Titanium -V0, -V1, -V2: PVDF/Hastelloy-C
O-ringsFPM (standard) EPR (EPDM), FFPM (optional)
Display WindowPolyamide (transparent nylon)
Protection RatingNEMA 4X/IP65
Power Requirements4 to 20 mA 24 VDC ±10%, regulated, 22.1 mA max.
Power Requirements(Frequency)5 to 24 VDC ±10%, regulated, 15 mA max.
Power Requirements ( 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.
Loop Accuracy32 µA max. error (25 °C @ 24 VDC)
IsolationLow voltage < 48 VAC/DC from electrodes and auxiliary power
Maximum Cable300 m (1000 ft)
Error condition22.1 mA, Selectable; Fail Open or Closed
Max. Loop Resistance300 ohm
Output ModesFreq., or Mirror Relay (display version only)
Max. Pull-up Voltage30 VDC
Max. Current Sink50 mA, current limited
Digital (S3L) OutputSerial ASCII, TTL level 9600 bps
Rating5 A @ 30 VDC max., 5 A @ 250 VDC max.
HysteresisUser adjustable for exiting alarm condition
Alarm On Trigger DelayAdjustable (0 to 9999.9 sec.)
Relay ModesOff, Low, High, Window, and Proportional Pulse
Relay SourceFlow Rate, Resettable Totalizer
Characters2 x 16
ContrastUser-set in four levels
Backlighting (only on relay versions)Requires external 9-24 VDC, 0.4 mA max.
Relative Humidity0 to 95% (non-condensing)
Operating Temperature Ambient-10 °C to 70 °C (14 °F to 158 °F)
Operating Temperature Media0 °C to 85 °C (32 °F to 185 °F)
Storage Temperature (F)-4 ° to 158 °
Storage Temperature (C)-20 ° to 70 °
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