ONICON System-40 BTU Measurement

Description

The System-40 provides highly accurate thermal energy measurement in chilled water, hot water or condenser water systems. It is provided as a complete meter and includes a matched pair of platinum RTD temperature sensors and an integral inline ultrasonic flow sensor. It is available for use in ½” through 2½” piping systems with flow rates ranging from 0.03 to 250 GPM.

Application

Monitoring chilled water, hot water and condenser water in AHU and CRAC units for:

  •  Commercial office tenant billing
  •  Residential apartment and condominium tenant billing

Monitoring renewable energy resources for:

  • Solar thermal applications
  • Ground source heat pumps
  • Geothermal heating systems

Features

  • Reliable No-Moving-Parts Design – 
    • Wetted transducers measure the ultrasonic signal transit time differential, which correlates directly to the flow rate. The direct beam path orientation significantly enhances signal strength and long term reliability.
  • Highly Accurate Over a Wide Flow Range –
    • The flow sensor is accurate to within ±1% of reading over the normal (25:1 turndown)
    • operating range and within ±2% of reading over an extended (100:1 turndown) range.
  • User-Friendly Backlit Display – 
    • The bright, easy-to-read, backlit display uses “smart button technology” to simplify page navigation and programming. This eliminates the need for special configuration tools.
  • Matched Platinum 1000Ω RTD Temperature Sensors
    • Sensors are paired in a matching process that ensures a differential measurement uncertainty of better than ±0.18°F.
  • Suitable for Water and Water/Glycol Solutions
    • System-40 is field programmable for both water and water/glycol solutions to ensure accurate flow and energy measurement.
  • Detachable Display
    • The display for the system-40 is easily detached from the flow sensor. This allows for remote mount installation up to 5ft from the sensor body. 
  • Built-in Interval Data Logger
    • Energy and volume totals are date/time stamped and logged within the meter along with other analytical data. This data is available via BACnet®.
  • ACCURACY
    • ±1% of reading over 25:1 turndown
    • ±2% of reading over 100: 1 turndown
    • Overall turndown exceeds 500: 1
    • Repeatability: ≤±0.2%
    • Meets EN1434 Class 1 accuracy requirements
  • TEMPERATURE SENSORS 
    • Field serviceable MID certified matched pair of 2-wire 1000Ω platinum RTDs
    • Calibrated to a differential measurement uncertainty of ±0.18°F
    • Meets EN1434/C900.1 accuracy requirements for 3K sensors
  • CALCULATOR 
    • Computation error: ≤ 0.09% at 30°F Δt
    • Meets EN1434 Class 1 requirements with 3K minimum Δt
  • PIPE SIZE RANGE 
    • ½ – 2½” nominal diameter
  • PIPING SYSTEM CONNECTIONS 
    • Male NPT threads 
    • 2½” meter provided with ANSI Class 150 raised face flanges
  • FLUID TEMPERATURE RANGE 
    • 32 to 250°F
  • MAXIMUM OPERATING PRESSURE 
    • 400 psi
  • PRESSURE DROP 
    • Less than 1 psi at 4 ft/s, decreasing at lower velocities
  • MATERIALS 
    • Wetted components: Lead-free brass, PEEK
    • Enclosure: Polycarbonate
  • ENVIRONMENTAL 
    • Meets EN1434/C900.1 Class A requirements
    • Operating Temperature Range: -13 to 131°F
    • Storage Temperature Range: -14 to 158°F
    • Enclosure Rating: IP65
  • POWER SUPPLY REQUIREMENTS 
    • 20-28V AC/DC, 50/60 Hz, 5 VA maximum
  • ISOLATED ANALOG OUTPUT 
    • Maybe programmable for energy rate, flow rate, supply temperature, return temperature or Δt
    • Configurable as: 4-20mA, 0-5 V or 0-10 V output
  • ISOLATED TOTALIZING SOLID STATE CONTACT CLOSURE PULSE OUTPUTS
    • Maybe programmed for energy, volume, alarm indication, mode indication or MODBUS coil indication
    • Contact ratings: 50 mA, 30 V
    • Contact pulse duration: 50, 100, 500 or 1000 ms
  • ISOLATED TOTALIZING PULSE INPUTS 
    • For use with sinking open collector or dry contact outputs
    • Input rating: 30 VDC, 10 mA maximum
    • Pulse duration: 50 ms minimum
  • NETWORK CONNECTIONS
    • Isolated RS485 serial interface
  • COMMUNICATION PROTOCOLS 
    • BACnet® MS/TP per ASHRAE Standard 135.1: 2009
    • MODBUS® RTU
  • NETWORK CONFIGURATION & ADDRESSING
    • Baud Rates: 4800, 9600, 19200, 38400, 76800, or 115200
    • Device Address Range: 1 – 255 (1 – 247 MODBUS® RTU)
    • Device Instance Range: 1 – 4,194,303 (BACnet® only)
    • Parity: None, Even, Odd (MODBUS® RTU only)


Reference : https://www.onicon.com/products/system-40-btu-meter/

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