The System-20 BTU Meter provides highly accurate thermal energy measurement in water and water/glycol cooling, heating, and condenser water systems. Energy measurements are based on signal inputs from a matched pair of temperature sensors and any of ONICON’s flow meters that are ordered separately.
The flexible design provides energy, flow, and temperature data on the local display via analog and pulse outputs, and over BACnet® MS/TP or MODBUS® RTU networks. Three auxiliary inputs are also provided to totalize pulses from other devices and communicate these totals directly to the network.
Chilled water, hot water, and condenser water systems for :
- Central plant monitoring
- Campus energy monitoring and cost allocation
- Performance/efficiency evaluations
- Energy monitoring for performance contracts
- AHU and CRAC units for commercial office tenant billing
- Solar, geothermal, and ground-source energy monitoring
Features :
- Multiple Output
- Simple Installation and Commissioning
- Multiple Flow Meter Options
- Multiple Temperature Sensor Option
- Ideal Submetering Solution
- Built-In Interval Data Logger
- User-friendly Interface
Specification :
Liquid Flow Rate
See the Accuracy statement
provided with the flow meter (ordered separately)
Differential Temperature
Meets EN1434/C900.1 accuracy
requirement for 3K sensors
Available
Options
-Precision solid-state
current-based sensor. The signal (mA) is unaffected by wire length.
Overall differential temperature measurement uncertainty of ±0.15ºF
over the application range.
- 1000Ω platinum RTDs calibrated to a differential measurement uncertainty of
±0.18ºF over the stated range
Calculator
Meets EN1434 Class 1 requirement
with 3K minimum Δt
Computation Error
≤0.09% at 30°F Δt
Mechanical
Dimension
5.5" H x 6.5" W x
4.25" D
Material
Enclosure
Glass-filled polycarbonate with a
UL-94
flammability rating suitable for use in plenum spaces
Environmental
Meet EN1434/C900.1 Class B
requirements
Operating Temperature Range
-13ºF to 140ºF
Enclosure Rating
NEMA 12K
Power Supply Requirements
20 - 28 AC/DC, 50/60 Hz
500mA DC or 1A AC maximum input current
Isolated Analog Output
May be programmed for energy rate,
flow rate, supply temperature, return temperature or Δt
Configurable
4-20 mA, 0-5V or 0-10V output
Isolated Totalizing Solid State
Contact Closure Pulse Outputs
May be programmed for energy,
volume, alarm indication, mode indication, or MODBUS coil indication
Contact Rating
50 mA, 30 V
Contact Pulse Duration
50, 100, 500, or 1000 ms
Isolated Totalizing Pulse Input
For use with devices providing a
sinking
open collectors or dry contact outputs
Network Connection
Isolated RS485 serial interface
Communication Protocols
Available Options
- 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 – 127 (1 - 247 MODBUS® RTU)
Device Instance Range
None, Even, Odd (MODBUS® RTU only)
Parity
None, Even, Odd (MODBUS® RTU only)
Approval
FCC
Part 15, Subpart B
BTL
Certified to ASHRAE 135:2009
UL Listed
CE
Baca juga: Onicon Flow Energy and Measurement
Visit Wmablog for more info and price
Liquid Flow Rate
See the Accuracy statement
provided with the flow meter (ordered separately)
Differential Temperature
Meets EN1434/C900.1 accuracy
requirement for 3K sensors
Available
Options
-Precision solid-state
current-based sensor. The signal (mA) is unaffected by wire length.
Overall differential temperature measurement uncertainty of ±0.15ºF
over the application range.
- 1000Ω platinum RTDs calibrated to a differential measurement uncertainty of
±0.18ºF over the stated range
Calculator
Meets EN1434 Class 1 requirement
with 3K minimum Δt
Computation Error
≤0.09% at 30°F Δt
Mechanical
Dimension
5.5" H x 6.5" W x
4.25" D
Material
Enclosure
Glass-filled polycarbonate with a
UL-94
flammability rating suitable for use in plenum spaces
Environmental
Meet EN1434/C900.1 Class B
requirements
Operating Temperature Range
-13ºF to 140ºF
Enclosure Rating
NEMA 12K
Power Supply Requirements
20 - 28 AC/DC, 50/60 Hz
500mA DC or 1A AC maximum input current
Isolated Analog Output
May be programmed for energy rate,
flow rate, supply temperature, return temperature or Δt
Configurable
4-20 mA, 0-5V or 0-10V output
Isolated Totalizing Solid State
Contact Closure Pulse Outputs
May be programmed for energy,
volume, alarm indication, mode indication, or MODBUS coil indication
Contact Rating
50 mA, 30 V
Contact Pulse Duration
50, 100, 500, or 1000 ms
Isolated Totalizing Pulse Input
For use with devices providing a
sinking
open collectors or dry contact outputs
Network Connection
Isolated RS485 serial interface
Communication Protocols
Available Options
- 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 – 127 (1 - 247 MODBUS® RTU)
Device Instance Range
None, Even, Odd (MODBUS® RTU only)
Parity
None, Even, Odd (MODBUS® RTU only)
Approval
FCC
Part 15, Subpart B
BTL
Certified to ASHRAE 135:2009
UL Listed
CE
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