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)

For More information please contact our Email : Marketing@wmablog.com