System-20 BTU Meter

The System-20 BTU Measurement System provides highly accurate and reliable thermal energy measurement in heating and cooling systems. Designed for maximum versatility, the System-20 provides energy, flow and temperature data on the local display, and communicates via RS485 BACnet® MS/TP or MODBUS® RTU directly with your BMS/BAS.

In addition, the System-20 provides an analog output signal, pulse outputs, and auxiliary pulse inputs, all of which are configurable via an intuitive user interface.

System-20 BTU Meter Typical Applications

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
Residential apartment and condominium tenant billing

Standard FeaturesProduct LiteratureOrdering InformationRelated Products

Multiple Outputs

Each meter is provided standard with three programmable pulse outputs and one analog output. An RS485 output is also provided for BACnet® MS/TP or MODBUS® RTU.

Multiple Flow Meter Options

The System-20 may be ordered with any of ONICON’s inline, insertion, or clamp-on style flow meters. This allows you to match specific flow meter features and benefits to your application.

Multiple Temperature Sensor Options

The System-20 may be ordered with ONICON’s precision current based sensors or a pair of matched Platinum RTDs. Each option offers exceptional accuracy and reliability.

Auxiliary Pulse Inputs

Three user defined pulse inputs are provided standard. Pulses from water, gas or electric meters may be totalized in the System-20 to simplify network connectivity at the metering location.

Built-In Interval Data Logger

Energy and volume totals are date/time stamped and logged within the meter along with operating status and other analytical data. Data is available via BACnet® or MODBUS®.

Suitable for Water and Water/Glycol Solutions

System-20s are field programmable for water or water/glycol solutions to ensure accurate flow and energy measurement.

User Friendly Interface Display

The bright, easy-to-read, back-lit display uses “smart button technology” to simplify programming and commissioning, eliminating the need for special configuration tools.

Wiring Diagrams

System-20 with F-1000 Turbine Flow Meter Wiring Connections

System-20 with F-3500 Insertion Electromagnetic Flow Meters Wiring Connections

System-20 with F-4300 Clamp-on Ultrasonic Flow Meters Wiring Connections

System-20 with F-4600 Inline Ultrasonic Flow Meters Wiring Connections

System-20 with F-4600 LCD Inline Ultrasonic Flow Meters Wiring Connections

System-20 with FSM-3 SuperMag Insertion Electromagnetic Flow Meters Wiring Connections

System-20 with FT-3000 Inline Electromagnetic Flow Meters Wiring Connections

System-20 with FT-3400 Insertion Electromagnetic Flow Meter Wiring Connections

System-20 BTU Meter Selection & Ordering Guide

ONICON-Product-Comprehensive-Order-Form-Workbook_Rev-18

ONICON Installation Hardware Selection Guide