The Cadillac® CMASS Mass Flow / Energy systems are designed to measure the energy consumed in Super-Heated Steam and Natural Gas applications.
Or talk to someone right away. Dial (888) 556-3913
The Cadillac® CMASS Mass Flow / Energy systems are designed to measure the energy consumed in Super-Heated Steam and Natural Gas applications. The system is a rate and totalizing device, which is capable of calculating and displaying Volume, Volume Flow rate, Corrected Volume, Corrected Flow rate, (Heat & Heat Flow rate in Natural Gas), Mass, Mass Flow rate, (Energy in Steam) , Temperature, Pressure, (Compressibility Factor in Natural Gas), and (Specific Volume & Enthalpy in Steam). Combined with Cadillac®’s superior flow meter technologies the CMASS provides the most accurate, repeatable, and maintenance free Mass Flow / Energy system available in the industry.
The Cadillac® HEATX CMASS Mass flow / Energy meter measures the Volumetric flow via a Cadillac® CV-P, CV-HS, or CV-U Vortex flow meter along with temperature and pressure inputs via separate loop powered transmitters and in turn calculates the Mass flow and Energy of the compressible media (Gas or Superheated Steam) being measured using internal calculations specific to either Steam (IAPWS industrial formulation) or Natural Gas (SGERG AGA-8 Gross equations).
Combined with Cadillac®’s superior flow meter technologies the CMASS Mass Flow / Energy meter has quickly become acknowledged as the industry standard. Customers choose the Cadillac® CMASS Mass Flow / Energy Meter because of proven: Accuracy, dependability, consistency, low maintenance, reliability, and rangeability.
Explore the CMASS system’s measurement modes, operating principles, components, communications, installation arrangements, specifications and selection requirements for steam and natural-gas applications.
View, print or share the consolidated nine-page CMASS technical product guide.
The Cadillac® CMASS is a configurable mass-flow and energy measurement system for compressible media. It combines a Cadillac vortex flow meter with separate loop-powered temperature and pressure transmitters selected for the application.
The CMASS processor receives the field-instrument signals, applies the appropriate steam or natural-gas calculations, and provides local indication, rate measurement, totalization and outputs to a building or process-control system.
A complete system may include the CMASS processor, a non-mechanical Cadillac flow meter, a temperature transmitter and a gauge-pressure transmitter. Instrument requirements vary according to the selected medium and calculation mode.
Factory-selected calculations can support superheated-steam energy and mass flow, documented saturated-steam configurations, or compensated natural-gas mass, corrected flow and heat-flow measurement.
Calculated values can be viewed and totalized at the CMASS display. Selected measurements can also be transmitted to building automation, DCS, energy-management or district-wide monitoring systems.
The required sensors, calculations, outputs and installation conditions depend on the medium and operating range. Confirm the complete application with Cadillac Meter before specifying or ordering the system.
The CMASS system provides compensated flow, mass and energy information for facilities that need more than a basic volumetric-flow reading. It can support operational monitoring, energy accounting, internal cost allocation and control-system integration.
Supplies calculated mass-flow and energy-consumption data to energy-management systems, building automation, DCS platforms and district-wide monitoring systems.
Provides accurately totalized energy or mass-flow measurements for applications where steam or natural-gas use must be assigned to an individual building, department or customer.
Supports campus-wide and multi-building systems where energy costs must be distributed among facilities, departments, production areas or other internal users.
Allows operators to monitor energy and mass-flow values from a central control room and compare system performance across operating periods or facility locations.
Measures energy or mass flow at central boiler locations, including superheated-steam distribution and natural-gas boiler-feed applications.
Provides direct measurement at individual buildings, process areas and other points of use where local consumption must be monitored or totalized.
Billing, operational monitoring and control applications can require different transmitter ranges, outputs and calibration documentation. Define how the measurements will be used before selecting the final CMASS configuration.
The CMASS begins with volumetric-flow measurement from a Cadillac vortex meter. Depending on the selected medium and configuration, it also receives temperature and pressure signals from separate loop-powered transmitters.
The processor applies application-specific thermodynamic or gas-property calculations to convert those field measurements into compensated flow, mass-flow and energy values.
Superheated-steam measurement uses volumetric flow, temperature and pressure inputs. The CMASS applies the IAPWS industrial formulation for the thermodynamic properties of steam.
Mass flow
Volume flow ÷ specific volume
Energy flow
Mass flow × specific enthalpy
The supplied 2024 saturated-steam application diagram shows a CV-P vortex-flow input and a pressure-transmitter input. Unlike the superheated-steam arrangement, it does not show a separate temperature input.
Confirm the available calculations, required pressure range and final output configuration with Cadillac Meter when selecting a saturated-steam system.
Natural-gas measurement uses volumetric flow, temperature and pressure inputs. The processor uses SGERG/AGA-8 Gross equations to determine density, compressibility and compensated flow values.
Mass flow
Volume flow × density at flow conditions
Heat flow
Mass flow × mass gross heating value
| Measurement Mode | Flow Input | Additional Inputs | Calculated Values |
|---|---|---|---|
| Superheated Steam | Volumetric flow | Temperature and pressure | Mass flow, energy, specific volume and enthalpy |
| Saturated Steam | Volumetric flow | Pressure shown in the 2024 diagram | Configuration-dependent mass and energy values |
| Natural Gas | Volumetric flow | Temperature and pressure | Mass flow, corrected flow, heat flow and compressibility |
The saturated-steam arrangement appears in newer 2024 documentation, while the older general brochure describes superheated steam and natural gas as the principal operating modes. Confirm the exact saturated-steam configuration and measurement outputs during system selection.
The CMASS combines field instruments with an application-configured processor. The field devices measure the operating conditions, while the CMASS calculates, displays, totalizes and transmits the required values.
Final component selection depends on the medium, pipe size, flow range, temperature, pressure, mounting arrangement and required control-system outputs.
| Component | System Function | Documented Characteristics |
|---|---|---|
| Cadillac Vortex Flow Meter | Measures volumetric flow through the pipe. | The documentation identifies CV-P configurations for steam. Older literature identifies CV-U for natural gas. The meter has no moving parts and operates using the Karman vortex principle. |
| Temperature Transmitter | Provides the temperature input where required by the selected calculation mode. | Documented as 24 VDC loop powered, with a scalable 4–20 mADC output and accuracy of ±0.1% of temperature span. Field adjustment may be available locally or through HART. |
| Pressure Transmitter | Supplies the pressure input needed for compensation and application-specific calculations. | Documented as 24 VDC loop powered, with a scalable 4–20 mADC output and accuracy of ±0.1% of pressure span. Field adjustment may be available locally or through HART. |
| CMASS Processor | Calculates, displays, totalizes and transmits the configured measurement values. | Factory configured for the specific application. Documented parameters can be adjusted through the front-panel interface without requiring a separate computer or special programming tool. |
Not every analog, pulse or digital communication option is supplied with every CMASS model. Identify the required building-automation or process-control interface before the system model code is finalized.
The documented superheated-steam arrangement combines a Cadillac CV-P vortex flow meter with separate temperature and pressure transmitters. All three measurements are sent to the CMASS processor.
The processor uses the measured flow, temperature and pressure to determine steam properties, calculate mass flow and energy flow, and provide the configured local and remote outputs.
Provides the volumetric-flow input.
Provides a 4–20 mADC temperature input.
Provides a 4–20 mADC pressure input.
Calculates, displays, totalizes and transmits the results.
The supplied 2024 diagram shows ten pipe diameters of straight run upstream of the flow meter.
The supplied 2024 diagram shows five pipe diameters of straight run downstream of the flow meter.
The 10-diameter upstream and 5-diameter downstream values reproduce the supplied 2024 general diagram. Elbows, valves, reducers and other flow disturbances may change the required straight run. Confirm the final piping arrangement with Cadillac Meter during system selection.
Cadillac Meter’s supplied 2024 saturated-steam diagram documents a CMASS arrangement using a CV-P vortex flow meter and a separate pressure transmitter. Both instruments provide inputs to the CMASS processor.
Unlike the documented superheated-steam arrangement, this configuration does not show a separate temperature transmitter. The selected saturated-steam calculation uses the configured flow and pressure data to produce the available mass-flow or energy values.
Measures volumetric steam flow and provides the flow input to the CMASS.
Provides the pressure measurement required by the documented saturated-steam arrangement.
Calculates, displays, totalizes and transmits the configured saturated-steam values.
The supplied 2024 saturated-steam diagram shows ten pipe diameters of straight run upstream of the flow meter.
The supplied 2024 saturated-steam diagram shows five pipe diameters of straight run downstream of the flow meter.
Saturated steam appears in the newer 2024 application documentation but is not listed as a principal operating mode in the older general CMASS brochure. Use the 2024 diagram as the latest general guidance, while confirming the calculation method, operating limits and disturbance-specific straight-run requirements during selection.
Natural-gas volume changes with pressure and temperature. The CMASS combines volumetric-flow measurement with separate temperature and pressure inputs so that the measured flow can be compensated for the actual operating conditions.
The processor uses SGERG/AGA-8 Gross equations to determine gas density and compressibility, then calculates the configured mass-flow, corrected flow and heat-flow values.
Provides the volumetric-flow input.
Measures the gas temperature at flow conditions.
Measures the gas pressure at flow conditions.
Compensates, calculates, totalizes and transmits the values.
The measured volumetric-flow rate is combined with the calculated density at actual flow conditions.
The mass-flow result is related to the configured reference conditions to provide a corrected flow value.
The mass-flow rate is combined with the configured mass gross heating value for the natural gas.
| Available Measurement | Description |
|---|---|
| Volume and Volume Flow | Measured gas volume and volumetric-flow rate at actual flow conditions. |
| Corrected Volume and Flow | Gas volume and flow compensated to the configured reference conditions. |
| Mass and Mass Flow | Totalized gas mass and calculated mass-flow rate. |
| Heat and Heat Flow | Totalized heat content and calculated heat-flow rate based on the configured gas heating value. |
| Temperature, Pressure and Compressibility | Process-condition measurements and the calculated gas compressibility factor. |
Corrected-flow and heat-flow calculations depend on the configured gas properties, heating value and reference conditions. Supply accurate application data when requesting a CMASS natural-gas system.
The following specifications consolidate the current product information, the general CMASS brochure and the supplied 2024 application diagrams.
The final specification depends on the selected flow meter, transmitters, mounting arrangement, power supply, calculation mode and communications package. Order-specific documentation governs the equipment supplied.
| Specification | Documented Requirement |
|---|---|
| Complete Measurement System | The documented system consists of a CMASS mass-flow and energy processor, a non-mechanical Cadillac flow meter, the required temperature sensor/transmitter and a gauge-pressure transmitter. The exact instruments depend on the selected measurement mode. |
| System Calibration | The system documentation specifies factory calibration and a certificate of NIST-traceable calibration with each system. Confirm any project-specific certification requirements when requesting a quotation. |
| Flow-Meter Principle | The Cadillac vortex flow meter has no moving parts and operates according to the Karman vortex principle. The sensor detects vortices generated by the shedder bar as fluid passes through the meter body. |
| Flow-Meter Accuracy | The supplied general documentation states an operational accuracy of ±1.0% of rate for the documented Cadillac vortex-meter configurations. |
| Flow-Meter Turndown | The older general brochure documents a minimum 25:1 turndown at the stated accuracy in a “best fit” installation. Actual rangeability depends on meter sizing and application conditions. |
| Temperature Transmitter | Accuracy documented as ±0.1% of temperature span. The transmitter is specified as 24 VDC loop powered with a scalable 4–20 mADC output and field adjustment through a local interface or HART. |
| Pressure Transmitter | Accuracy documented as ±0.1% of pressure span. The transmitter is specified as 24 VDC loop powered with a scalable 4–20 mADC output and field adjustment through a local interface or HART. |
| Local Interface | The processor includes a local display and front-panel controls for viewing measurements and making documented adjustments. The system is factory configured for its specific application. |
| Processor Outputs | Supplied documentation identifies configurable analog 4–20 mADC, pulse and digital communication outputs. The exact quantity and combination vary by ordered model code. |
| Digital Communications | Documented protocols include Modbus RTU over RS-485, Modbus TCP/IP, BACnet TCP/IP and BACnet MS/TP. Confirm standard and optional protocols for the selected CMASS configuration. |
| Wall-Mount Power | The supplied application diagrams show 115 VAC power to the wall-mounted CMASS. Older model-code documentation also lists 12–28 VDC and 110/120 VAC power variants. |
| Straight-Run Requirement | A fully developed flow profile must be maintained through the meter. The supplied 2024 diagrams show 10 pipe diameters upstream and 5 downstream, but disturbance-specific requirements must be confirmed for the final installation. |
These values summarize the supplied general literature and should not be treated as a substitute for an order-specific datasheet. Confirm meter size, operating range, materials, enclosure, power, outputs and calibration requirements before purchase.
CMASS documentation identifies wall-mount and panel-mount arrangements. The appropriate option depends on the installation environment, available electrical enclosure, power supply and required field wiring.
The wall-mount arrangement places the CMASS processor and associated electrical components inside a prewired, fuse-protected enclosure for field mounting and termination.
The panel-mount arrangement is intended for installations where a suitable electrical panel already exists and the CMASS processor can be incorporated into that enclosure.
The older general brochure shows a nominal wall enclosure measuring 16 × 14 inches. The supplied 2024 application diagrams instead show a 12 × 12 inch wall-mount enclosure.
This indicates that enclosure dimensions may vary by configuration or documentation revision. Do not fabricate mounting arrangements from either general dimension alone. Obtain the current order-specific enclosure drawing from Cadillac Meter.
The following codes are reproduced from the Rev. 1211 general brochure. They are useful for interpreting older CMASS documentation but may not represent every current option.
| Position | Code | Meaning in Rev. 1211 Literature |
|---|---|---|
| Mounting | P / W | Panel mount / wall mount |
| Outputs | 0 | Two relays, one isolated 4–20 mA or pulse output, and four logic inputs |
| Outputs | 1 | The preceding outputs plus RS-485, two additional relays and one additional isolated output |
| Power Supply | DC / AC | 12–28 VDC / 110–120 VAC |
| Calculation | S / G | Steam tables and formulas / gas tables and formulas |
Current communications, output and enclosure options may extend beyond the Rev. 1211 model structure. Request a current configured model code and dimensional drawing before specifying or ordering the CMASS system.
CMASS performance depends on correct application definition, instrument sizing, transmitter ranges, piping conditions and output selection.
Provide the following information when requesting assistance so Cadillac Meter can configure the flow meter, transmitters, processor, enclosure and control-system interface as one complete measurement package.
Identify whether the application involves superheated steam, saturated steam or natural gas, and specify the required rate, total, mass-flow or energy values.
Supply the minimum, normal and maximum flow rates, along with the operating temperature, pressure and expected variations.
Provide the line size, schedule, connection type, materials and any project-specific pressure or temperature rating requirements.
Identify nearby elbows, valves, reducers, expanders or other disturbances and state the straight run available upstream and downstream.
Specify wall or panel mounting, the available power supply, enclosure requirements and the installation environment.
List the required local values, analog or pulse outputs, network protocol, building-automation points and totalizer information.
View, print or share the consolidated guide for operating principles, installation arrangements, general specifications, mounting options and model-code guidance.
