Uses measured flow and temperature information to calculate thermal power and accumulated energy.
HEATX-2 BTU Energy Meter
HEATX-2 BTU Energy System is the first Dual channel, graphical display archiving device for Hot/Chilled water measurement or for any Energy system where liquid is the carrier media.
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The NEW Cadillac® HEATX-2 BTU Energy Meter is the first single or dual measurement system, designed to measure the energy consumed in Single or Dual Channel Hot/Chilled water, Condensate (Total Heat BTU), Single pipe Heat/Cool, and Forward/Reverse flow Heating or Cooling systems. The system measures, calculates, displays, and stores energy consumption, which include Volume, Energy, Power, and Temperatures. Key features include a graphical color TFT VGA display, an onboard memory for archiving, a 10/100base T Ethernet port with a wide variety of communication protocols, and a USB connection. Combined with Cadillac ®’s superior flow meter technologies the HEATX provides the most accurate, reliable, and maintenance free energy system available in the industry.
The Cadillac ® HEATX-2 BTU Energy Meter was designed with 50 MB of onboard flash memory for data archiving for redundancy, if connected to a BAS/BMS. Or stand alone for users without a building automation system. Once archived data may be transferred via Ethernet or USB and can be viewed on Energy Review archiving software optional with each HEATX-2 system.
Technical Product Guide
HEATX-2 BTU Energy Meter
Explore the HEATX-2 BTU Energy Meter’s operating principles, application configurations, communication options, data archiving, specifications, model-code selections and installation guidance. This consolidated technical resource is designed to support system selection, engineering review and purchasing decisions.
HEATX-2 at a Glance
The Cadillac Meter HEATX-2 is a configurable BTU energy computer for measuring thermal energy in heating, cooling and related energy-transfer systems. It combines volumetric-flow and precision-matched temperature inputs to calculate thermal power and accumulated energy.
Single- and dual-channel configurations allow the instrument to support different system arrangements. Available outputs and communication options enable calculated values to be displayed locally and transmitted to a BAS, BMS, SCADA system or other monitoring equipment.
Supports hot-water, chilled-water, condensate and other compatible thermal-energy measurement arrangements.
Can process one measurement circuit or two independent circuits, depending on the ordered configuration.
Provides local information together with ordered outputs and communications for connection to monitoring and control systems.
HEATX-2 System Overview
The Cadillac HEATX-2 is a single- or dual-channel BTU energy measurement system for hot-water heating, chilled-water cooling and other liquid-carrier energy applications. It combines flow measurement with precision-matched feed and return temperature inputs to calculate thermal energy consumption.
Calculated and measured information can be displayed locally, retained in onboard memory and transmitted to a building automation or energy management system. Depending on the selected configuration, the HEATX-2 can support one energy-measurement loop or two independent measurement loops from a single platform.
Single or Dual Measurement
Available for one or two BTU energy-measurement channels to suit individual or independent system loops.
Local Colour Display
A graphical 3.5-inch colour TFT display provides local access to energy, power, flow and temperature information.
Onboard Data Archiving
Fifty megabytes of onboard flash memory provide local historical data storage for standalone use or system redundancy.
Building-System Integration
Ethernet, USB, analog outputs, a relay output and model-dependent communication protocols support wider system integration.
Applications and System Configurations
The HEATX-2 is designed for energy measurement wherever a liquid transfers heating or cooling energy through a system. Its configurable inputs make it suitable for new installations, retrofit projects and applications requiring one or two independent measurement channels.
Hot-Water Heating
Measures transferred heating energy using liquid flow together with the temperature difference between the system’s feed and return lines.
Chilled-Water Cooling
Calculates cooling energy from flow and differential-temperature measurements in chilled-water distribution and process-cooling systems.
Pumped Condensate
Supports pumped-condensate energy measurement using condensate flow and temperature together with a fixed or measured steam-supply condition.
Dual-Loop Measurement
A dual-channel configuration can monitor two independent energy loops, reducing the need for separate calculation and display units.
Typical Project Environments
Typical uses include commercial and institutional HVAC systems, district-energy networks, plant rooms, campus utilities, tenant or departmental energy allocation, industrial process systems and performance-monitoring projects.
Principle of Operation
The HEATX-2 determines transferred thermal energy by combining volumetric flow with precision-matched feed and return temperature measurements. The measured temperatures allow the system to account for changes in fluid density and specific enthalpy across the energy loop.
From these inputs, the HEATX-2 calculates instantaneous thermal power and accumulated energy. The resulting values can be shown on the local display, retained in onboard memory and transmitted to a building automation or energy-management system.
Thermal Power Relationship
P = V × ρ × (hfeed − hreturn)
The exact displayed and totalized units are selected during system configuration for the intended application.
P
Calculated thermal power
V
Volumetric flow rate
ρ
Fluid density
h
Specific enthalpy at the measured temperature
Configurable Operating Modes
Heating
Only positive temperature differences are included in the accumulated energy total.
Cooling
Only negative temperature differences are included in the accumulated energy total.
Heating and Cooling
Energy increases whether the measured temperature difference is positive or negative.
Charge and Discharge
Separate registers accumulate positive and negative energy totals for bidirectional thermal-storage applications.
Measurement Configurations
HEATX-2 configurations combine flow and temperature information according to the type of energy system being monitored. Correct sensor placement and configuration are essential because the calculation method differs between closed-loop water systems and pumped-condensate applications.
Hot-Water and Chilled-Water Systems
In a heating or cooling loop, the HEATX-2 receives the liquid flow rate and measures the temperatures in the feed and return lines. These values are used to determine the energy transferred through the system.
- One compatible flow signal for each measurement channel
- One precision-matched temperature-sensor pair per channel
- Feed and return sensor positions assigned during configuration
- Heating, cooling or combined operating mode selected for the system
Pumped-Condensate Systems
For pumped-condensate measurement, the system uses condensate flow and temperature to establish the returned energy. That value is compared with the energy associated with the steam supplied to the process.
- Condensate flow is measured after the receiver and pump
- Condensate temperature is measured in the pumped return line
- Steam-supply pressure or temperature may be fixed or measured
- The arrangement must maintain a full pipe at the flow meter
Single- and Dual-Channel Arrangements
Single Channel
Monitors one complete energy loop using one flow input and one precision-matched temperature-sensor pair.
Dual Channel
Monitors two independent energy loops, with separate flow and temperature inputs and separately calculated channel values.
Display, Outputs and Communications
The HEATX-2 provides local indication, onboard data storage and multiple connection options for transferring measured and calculated information to external systems. Available communication selections depend on the complete model configuration.
These capabilities allow the instrument to operate as a local energy display, a standalone historical-data recorder or part of a wider building automation and energy-management network.
Local Colour Display
The graphical 3.5-inch colour TFT screen gives operators local access to system values such as accumulated energy, thermal power, flow and measured temperatures.
Onboard Data Storage
Fifty megabytes of internal flash memory support historical data archiving, providing a local record for standalone monitoring or additional system redundancy.
External System Integration
Analog, relay, Ethernet, USB and model-dependent protocol options allow selected HEATX-2 information to be shared with compatible monitoring, control and energy-management systems.
Published Interface Capabilities
| Interface | Function |
|---|---|
| Ethernet | Provides a network connection for compatible system access and data communication. |
| USB | Supports local connection and transfer functions associated with system configuration and stored information. |
| Analog Outputs | Allow selected process or calculated values to be transmitted to compatible external equipment. |
| Relay Output | Provides a discrete output for a configured system function. |
| Communication Protocols | Model-dependent protocol selections support integration with compatible building automation and energy-management platforms. |
Measurement Inputs and Sensors
The HEATX-2 combines temperature and volumetric-flow inputs to calculate thermal power and accumulated energy. The required inputs depend on the application and whether the instrument is configured for one or two measurement channels.
Precision-matched RTD transmitter assemblies provide the temperature information used to determine fluid density and enthalpy. Flow information may be supplied by a compatible Cadillac Meter flow meter or another volumetric flow meter providing a compatible analog output.
Temperature Inputs
Precision-matched RTD transmitter assemblies measure the relevant feed, return, condensate or steam-line temperatures required by the selected calculation method.
Volumetric Flow Input
The system accepts flow information from a compatible Cadillac Meter flow meter or another volumetric flow meter equipped with an analog 4–20 mA output.
Single or Dual Channels
A single-channel system processes one set of measurement inputs. A dual-channel system can process two independent sets and maintain separate calculated values and registers.
Inputs by Application
| Application | Temperature Measurement | Flow Measurement |
|---|---|---|
| Hot or Chilled Water | Precision-matched RTD transmitters measure the feed and return temperatures. | A compatible flow meter measures the volume passing through each monitored loop. |
| Condensate | RTD transmitters measure the condensate-line and steam-line temperatures required for the energy calculation. | Condensate volume is measured in a gravity-flow or pumped-return arrangement using a compatible analog flow signal. |
| Single-Pipe Heating/Cooling | Feed and return temperatures allow the system to recognise changes between heating and cooling conditions. | A compatible analog flow input supplies the volumetric-flow value used in the energy calculation. |
| Forward/Reverse Flow | Precision-matched temperature inputs establish the thermal relationship across the system. | A compatible bidirectional flow meter allows the HEATX-2 to recognise a change in flow direction and use separate registers. |
Installation and System Performance
A complete HEATX-2 installation combines the energy computer, compatible flow measurement and precision-matched temperature transmitters. Each component must be correctly selected, positioned and configured because overall system performance depends on the quality of every measurement entering the energy calculation.
Final installation requirements vary with the selected flow meter, application, pipe arrangement and measurement mode. The approved project drawings and instructions supplied with each component should therefore take priority over general arrangement diagrams.
Flow-Meter Installation
Install the selected flow meter in the required orientation and observe its published straight-run, grounding, full-pipe and flow-direction requirements. The configured HEATX-2 flow range must correspond with the meter’s output.
Temperature Sensors
Install the precision-matched temperature assemblies at the designated feed, return, condensate or steam measurement points. Correct channel assignment and adequate thermal contact are essential to the calculated temperature difference.
Energy Computer
Mount the HEATX-2 where operators can safely access the display and connections. Protect the enclosure and wiring from unsuitable environmental conditions, electrical interference and mechanical damage.
Installation Checklist
| Check | Requirement |
|---|---|
| Application Mode | Confirm heating, cooling, combined heating and cooling, or charge/discharge operation before commissioning. |
| Channel Assignment | Verify that every flow and temperature input is assigned to the correct measurement channel and physical pipe. |
| Flow Signal | Confirm signal type, engineering units, flow range and direction against the connected flow meter. |
| Temperature Inputs | Check sensor pairing, locations, wiring and feed/return designation before accepting calculated energy values. |
| Outputs and Communications | Confirm output scaling, protocol settings, network details and register mapping with the receiving BAS, BMS or monitoring system. |
| Functional Verification | Compare displayed flow, temperatures, temperature difference, thermal power and accumulated energy with expected operating conditions. |
Model Code and Product Selection
The HEATX-2 model code defines the instrument’s measurement channels, input arrangement, outputs, communications and other ordered options. These selections should be made as one complete system so that the energy computer matches the connected flow meters, temperature transmitters and receiving control system.
Use the published chart below as a preliminary ordering reference. Confirm the complete model code and all application-specific requirements with Cadillac Meter before purchasing or preparing final project documents.
Information to Confirm Before Ordering
Application and Operating Mode
Identify the fluid, heating or cooling duty, pipe arrangement and required method of accumulating energy.
Measurement Channels
Confirm whether one energy circuit or two independent circuits will be monitored by the HEATX-2.
Flow and Temperature Inputs
Specify the flow-signal type and range together with the required precision-matched temperature-transmitter arrangement.
Outputs and Communications
Identify the analog, relay, network and communication requirements of the BAS, BMS, SCADA or other receiving equipment.
Engineering Units
Confirm the required units for flow, temperature, thermal power and accumulated energy.
Project Requirements
Record the available power, mounting location, enclosure conditions, data-storage needs and applicable project standards.
Download the Guide or Request a Quote
HEATX-2 Technical Support
Take the Technical Guide With You
Download the complete HEATX-2 BTU Energy Meter Technical Guide for project discussions, equipment reviews and preliminary system selection.
For pricing or configuration assistance, submit the product-specific quotation form. Include the application, fluid, pipe size, flow range, channel quantity and communication requirements whenever available.