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255 Series Flow Averaging Transmitter

Brand: Kurz Instruments
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The Kurz Series 255 Flow Averaging Transmitter is a versatile system transmitter designed for measuring flow rates in very large ducts that have non-uniform or unstable velocity profiles and/or wide temperature ranges.

The Series 255 is a state-of-the-art microprocessor-based system that powers and reads up to 16 independent sensing points, providing a grand average of the flow and temperature.

The Series 255 continuously reads and analyzes flow and temperature data from the individual channels, and automatically removes channels from the average that are under alarm or have been removed for service or repair.

The Series 255 is designed for high reliability and high availability with multiple and independent power and communication ports so that wiring issues will not bring down the entire multi-sensor network.
Features
  • Up to 16 sensors providing point velocity, temperature, and sensor fault code
  • Polycarbonate, Stainless Steel, or rack mount options
  • Flow and temperature measurement data quality indication for event logging
  • Maintains a 30-day log of daily flow totals
  • Velocity-dependent correction factors for flow rate calculations
  • Optically-isolated loop powered 4-20 mA output
  • Two digital inputs:
    • DI1 - External trigger to toggle Maintenance Mode
    • DI2 - External trigger to initiate Zero-Span Cycle
  • Six power/data ports for input channel network segmentation
    • Reverse polarity, ESD, Surge, EFT, and EMI protection
    • Each port current limited to 3.4 A
  • One 4-20 mA non-isolated analog input
  • Battery backed real-time clock
  • User-defined TAG ID and flow area
  • Three EEPROM data areas for system configuration restore points
  • Automatic sensor out-of-tolerance indication, alarm, and re-averaging for multipoint flow elements
  • Isolated USB to RS-485 port for auxiliary MODBUS connection to individual channels
    • Galvanic isolation up to 1000 VDC
  • User‐configurable English or metric units for mass flow rate, mass velocity, and process temperature
    • KGH, KGM, NCMH, NLPM, NMPS, PPH, PPM, SCFH, SCFM, SFPM, SLPM, SMPS
  • Easy‐to‐use interface
    • Backlit Display with 4‐lines of 20‐characters each; 20-button keypad
  • User-configurable flow display (scrolling or static)

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Specifications

Brand

Certificates & Compliance

  • Industrial Safety for Electrical Equipment: Ordinary Locations - IEC/CSA/UL 61010-1 and 61010-2-030
  • Industrial Safety for Electrical Equipment: Hazardous Locations - ETL/cETL, ATEX | IEC/CSA/UL 60079-0 - Explosive Atmospheres |  IEC/CSA/UL 60079-7 - Increased Safety |  IEC/CSA/UL 60079-15 - Type of Protection | IEC/CSA/UL 60079-31 - Equipment Dust Ignition
  • EMI Compliance: EN 61000-6-2 - EMC Immunity | EN 61000-6-4 - EMC Emission | EN 61000-3-2 - Harmonic Current Emissions | EN 61000-3-3 - Voltage Fluctuations & Flicker
  • Environmental: IP 65 Ingress Protection | IP 66 Ingress Protection | NEMA Type 4X
  • NAMUR Signaling Standard: NE43-Compliant 4-20 mA Outputs | NE107-Compliant Front Panel Indicators

Display Update

  • 2 seconds

Electronics Operating Temperature

  • -20° C to 50° C

Flow Measurement Range

  • 0 to 70,000 SFPM x A (0 to 325 NMPS x A), A=Pipe / Duct Area

Input Power

  • Models 255A, 255B, 255C - 100-240 Vac, 50/60 Hz
  • Model 255DC - 24 Vdc, 3.6-13.5 A,  depending on number and type of flow sensors

Measurement Rate

  • < 0.1 second per Sensor @ 38.4 kbps

Models

  • AC-Powered Models (Model 255A up to 4 Channels,  Model 255B up to 9 Channels,  Model 255C up to 16 Channels)
  • DC-Powered Model (Model 255DC up to 16 Channels)

Optically-Isolated Loop Powered 4-20 mA Outputs (+/- 48 VDC Isolation)

  • 12-bit Resolution and Accuracy
  • Maximum Loop Resistance is 300 Ohm at 18 Vdc
  • 550 Ohm at 24 Vdc, 1400 Ohm at 36 Vdc

Temperature Measurement Range

  • HT Elements: -40° F to 500° F (-40° C to 260° C)
  • HHT Elements: -40° F to 932° F (-40° C to 500° C)

Two Optically Isolated Solid-State Relays/Alarms

  • 0.5 A, 24 Vdc Optically Coupled Solid State Relays

Options

  • NEMA Type 4X Window Kits for Stainless Steel Enclosures
  • Startup Assistance: Site visit by factory technicians for startup, installation Verification, and Commissioning
  • Field Calibration: In-situ Flow Profile Traversing with Calibrated Measuring Equipment by Qualified Technician

  • Stack & Flue Gas
  • Coal Pulverizer Air
  • Cement Plants
  • Nuclear Power Plants
  • EPA & AMS Emissions Monitoring
  • Any Duct without Metering Runs

Documentation

Brochures

Manuals

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