Overview
Onicon 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.
Onicon System-20 BTU Meter 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
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
Specification
| Liquid Flow Rate | See 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. 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 requirements 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 sinking open collector 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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