The ONICON System-40 BTU Measurement 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.
ONICON SYSTEM-40
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
ONICON SYSTEM-40
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
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