The Cadillac® CMAG Pumped and Gravity Condensate Meter is a totalizing magnetic flow meter designed for compatible pumped and gravity condensate applications. Its full-bore design provides an obstruction-free flow path with no moving measuring components. The liquid must have conductivity of at least 3.0 µS/cm, and the flow tube must remain completely flooded during measurement. Gravity installations may require a piping wet leg to maintain a full flow tube.
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The Cadillac® CMAG Pumped and Gravity Condensate Meter is a totalizing magnetic flow meter designed for compatible pumped and gravity condensate applications. Its full-bore construction provides an obstruction-free flow path with no moving measuring components inside the meter tube.
The CMAG uses Faraday’s law of electromagnetic induction to measure conductive-liquid flow. As the liquid passes through the meter’s magnetic field, electrodes detect an induced voltage proportional to its velocity. The electronics use this measurement, the flow-tube area and the meter’s individual calibration factor to calculate and totalize volumetric flow.
The measured liquid must have conductivity of at least 3.0 µS/cm, and the flow tube must remain completely flooded during measurement. Gravity condensate installations may require a piping wet leg to maintain a full meter tube. Final selection should account for the liquid, flow range, operating temperature, pressure, pipe size, installation arrangement and required outputs.
Explore the CMAG meter’s operating principle, performance data, specifications, dimensions, installation requirements and complete model-code information. The full technical guide is also available as a downloadable PDF for convenient reference.
The Cadillac® CMAG Pumped and Gravity Condensate Meter is a totalizing magnetic flow meter designed specifically for pumped and gravity condensate applications. Its full-bore, obstruction-free flow path allows conductive liquids to pass through the meter without moving components inside the flow tube.
A uniform magnetic field enables the CMAG to measure flow accurately where limited piping straight run or an undeveloped flow profile makes installation difficult. The liquid must have conductivity of at least 3.0 µS/cm, and the meter must remain completely flooded during measurement. In gravity applications, a piping wet leg may be required to maintain a full flow tube.
Accuracy of reading with 1.5 pipe diameters of straight run upstream and downstream from the meter centreline.
Accuracy of reading when no piping straight run is available.
Typical turndown at ±0.25% accuracy, supporting systems with widely varying flow rates.
Minimum stated fluid conductivity required for measurement.
Published turndown extends from 300:1 to 500:1, depending on the specified accuracy band.
The full-bore design contains no mechanical measuring components or obstructions within the flow path.
Only 1.5 pipe diameters of straight run upstream and downstream are specified for ±0.25% accuracy.
Electronics can provide local indication and totalization or support integration with a remote monitoring system.
| Item | Published Specification |
|---|---|
| Display and totalization | Instantaneous and totalized flow at a local indicator or remotely through outputs |
| Standard outputs | Pulse and analog 4–20 mA |
| Communications | Modbus and Profibus available |
| Power supply | 100–240 VAC, 50/60 Hz; optional 24 VDC |
| Power consumption | Approximately 14 W |
| Diagnostics | Empty-pipe detection and contact digital output available for alarm use |
Service-life statement: The source product information states a mean time between failure of 40 years. Actual service life depends on the application, environment, installation and operating conditions.
The CMAG operates according to Faraday’s law of electromagnetic induction. When a conductor moves perpendicularly through a magnetic field, it generates a voltage proportional to the conductor’s velocity. Inside the CMAG, the moving conductive liquid acts as that conductor.
Encapsulated coils rigidly retained within the flow tube create a magnetic field across the meter bore.
As conductive liquid passes through the magnetic field, electrodes measure the voltage induced by its movement.
The electronics use the measured liquid velocity, flow-tube area and the meter’s individual K-factor to calculate volumetric flow.
Each meter has a unique K-factor established during a NIST-traceable flow test completed before shipment. Once this calibration factor is established, the converter can display the calculated flow in selected engineering units and retransmit the information through a 4–20 mA signal, conditioned pulse or available communication output.
The flow tube must remain completely flooded while measurements are being taken. Gravity condensate installations may require a piping wet leg to maintain a full meter tube. The measured liquid must also have conductivity of at least 3.0 µS/cm.
The following published specifications cover the CMAG meter’s construction, measurement performance, electrical requirements, outputs and operating capabilities.
| Parameter | Published Specification |
|---|---|
| Construction | Full-bore body with an encapsulated, rigidly retained coil set |
| Electronics | Integral or remote; indication and totalization available |
| Accuracy | ±0.25% of reading with 1.5 pipe diameters of straight run upstream and downstream from the meter centreline; ±0.50% of reading with no straight run |
| Turndown | Typically 300:1 at ±0.25%; 400:1 at ±0.50%; and 500:1 at ±1.00% |
| Measurement principle | Faraday’s law; induced voltage is proportional to conductive-liquid velocity |
| Minimum conductivity | 3.0 µS/cm |
| Flow-tube condition | The flow tube must remain completely flooded during measurement |
| Flow-tube pressure | ANSI Class 150 or ANSI Class 300 |
| Power | 100–240 VAC, 50/60 Hz; optional 24 VDC; approximately 14 W |
| Outputs | Pulse and analog 4–20 mA; Modbus and Profibus communications available |
| Alarm capability | Empty-pipe detection and contact digital output available |
Selection note: Confirm the required liner, electronics arrangement, pressure class, meter size, process temperature, liquid conductivity, ability to maintain a completely flooded flow tube, connection standard, power supply and outputs before ordering.
The CMAG’s allowable fluid-temperature range depends on the selected flow-tube liner and whether the electronics are mounted integrally or remotely. Use the following published limits when specifying the meter.
| Flow-Tube Liner | Electronics Configuration | Published Fluid-Temperature Range |
|---|---|---|
| EPDM | Integral or remote | 14°F to 176°F |
| PFA | Integral or remote | 14°F to 248°F |
| Ceramic | Integral | 14°F to 248°F |
| Ceramic | Remote | 14°F to 356°F |
A ceramic liner combined with remote electronics provides the highest published fluid-temperature limit: 356°F.
The permitted range changes with liner material and electronics placement. Confirm both selections against the expected process temperature.
Specification note: These are fluid-temperature limits, not ambient-temperature limits. Final meter selection should account for process conditions, liner compatibility, electronics location and pressure class.
Use the dimensional drawing together with the tables below to identify the face-to-face length, overall height, centreline-to-top measurement and approximate ANSI Class 150 weight for each available meter size.
Face-to-face meter length
Meter centreline to top
Overall top-to-bottom height
| Measurement | 0.5″ | 1.0″ | 1.5″ | 2.0″ | 3.0″ | 4.0″ |
|---|---|---|---|---|---|---|
| L1 – Face to face | 5.51″ | 6.30″ | 6.69″ | 7.09″ | 9.06″ | 9.45″ |
| L2 – Centreline to top | 7.99″ | 8.23″ | 8.58″ | 9.13″ | 10.04″ | 10.31″ |
| L3 – Top to bottom | 9.88″ | 10.71″ | 11.34″ | 12.20″ | 13.66″ | 14.45″ |
| ANSI Class 150 weight | 14 lb | 18 lb | 23 lb | 29 lb | 45 lb | 58 lb |
| Measurement | 6.0″ | 8.0″ | 10.0″ | 12.0″ | 14.0″ | 16.0″ | 18.0″ |
|---|---|---|---|---|---|---|---|
| L1 – Face to face | 10.24″ | 11.81″ | 13.78″ | 15.75″ | 17.72″ | 19.69″ | 21.65″ |
| L2 – Centreline to top | 11.22″ | 12.20″ | 13.18″ | 14.37″ | 14.72″ | 15.63″ | 16.54″ |
| L3 – Top to bottom | 16.73″ | 18.70″ | 21.06″ | 23.15″ | 24.37″ | 26.65″ | 28.74″ |
| ANSI Class 150 weight | 86 lb | 128 lb | 265 lb | 315 lb | 375 lb | 475 lb | 650 lb |
Planning note: Confirm the selected pressure class and final approved dimensional drawing before fabricating pipework, supports or access clearances. The listed weights apply to ANSI Class 150 configurations.
The CMAG’s uniform magnetic-field design reduces the need for conventional flow conditioning and extensive lengths of straight pipe. Correct installation must still keep the flow tube completely flooded, use liquid with conductivity of at least 3.0 µS/cm and provide the piping arrangement required for the selected accuracy level.
The meter tube must remain completely flooded whenever flow is being measured. An empty or partially filled tube will prevent dependable measurement.
Gravity condensate applications may require a piping wet leg to maintain a flooded meter tube throughout the operating cycle.
The measured liquid must have conductivity equal to or greater than the published minimum of 3.0 µS/cm.
The individual meter K-factor is not influenced by the external piping arrangement or mounting orientation.
| Piping Arrangement | Published Accuracy | Installation Guidance |
|---|---|---|
| 1.5 pipe diameters upstream and downstream | ±0.25% of reading | Measure the required distance from the meter centreline. |
| No external straight-pipe run | ±0.50% of reading | The meter can operate without additional flow profiling where the tighter accuracy level is not required. |
| Meter sizes 2 inches and below | Refer to selected configuration | The source documentation states that the flow tube itself satisfies the 1.5-diameter straight-run provision for these sizes. |
The CMAG is designed to respond to turbulent or tumbling flow and can accommodate space-constrained installations near elbows, tees and valves. Apply the stated straight-run requirement whenever ±0.25% accuracy is required.
Verify that the meter tube remains completely flooded, the liquid has conductivity of at least 3.0 µS/cm, the flow direction and electrical connections match the approved documentation, and the installed piping arrangement supports the required accuracy.
The CMAG model code identifies the meter size, converter arrangement, body style, pressure class, electrode material, liner, grounding-ring material, power supply and applicable approvals. Use the published chart below as a reference and confirm the complete configuration with Cadillac Meter before ordering.
| Selection | Code | Published Option |
|---|---|---|
| Meter size | A | 0.5 inch |
| B | 1 inch | |
| C | 1.5 inches | |
| D | 2 inches | |
| E | 3 inches | |
| F | 4 inches | |
| G | 6 inches | |
| H | 8 inches | |
| I | 10 inches | |
| J | 12 inches | |
| K | 14 inches; consult factory for larger sizes | |
| Converter | II | Integral converter with indicator/totalizer |
| RC | Remote converter | |
| Body | W | Wafer body with ceramic liner; through 4 inches only |
| F | Flanged body | |
| Pressure class | 150 | ANSI Class 150 |
| 300 | ANSI Class 300 | |
| Electrode material | S | 316L stainless steel; standard with polyurethane liner |
| X | Other electrode material | |
| Liner material | C | PTFE/PFA (Teflon), rated to 250°F; NSF |
| U | Polyurethane, rated to 140°F; NSF for sizes 4 inches and above | |
| D | EPDM rubber | |
| A | Ceramic, rated to 350°F with remote-converter option | |
| Grounding-ring material | S | 316 stainless steel |
| H | Hastelloy C | |
| X | Other grounding-ring material | |
| Power supply | – | Standard 100–240 VAC autoranging power supply |
| 24 | Optional 24 VDC power supply; 18–36 VDC allowable | |
| Approval | FM | FM approvals |
| Code Element | Meaning |
|---|---|
| CMC | CMAG remote converter |
| R | Remote mounting |
| I | Indicator/totalizer |
| U | Universal mounting bracket |
| XXFT | Interconnecting cable; specify the required length in feet |
| FM | FM approvals |
Some combinations are size-, material- or temperature-dependent. Provide Cadillac Meter with the liquid type, minimum conductivity, line size, normal and maximum flow, process temperature, pressure, installation arrangement, ability to maintain a completely flooded flow tube, power supply and required outputs so the final meter configuration and model code can be verified. The liquid must have conductivity of at least 3.0 µS/cm during measurement.
Download the complete product guide or review the recommended piping arrangements for pumped and gravity condensate applications. These documents can be saved, printed or forwarded for engineering and purchasing review.
Review the CMAG operating principle, performance specifications, temperature limits, dimensions, installation requirements, model codes and selection information.
View or Download Technical GuideView the pumped-condensate arrangement, reduced wet-leg installation and wet-leg installation with isolation valves, bypass and cleanout provisions.
View or Download DiagramsInstallation note: These drawings provide general application guidance. Final meter sizing, materials, piping configuration and installation requirements must be checked against the actual process conditions.
These answers cover the most common questions about CMAG applications, accuracy, turndown, installation, liquid compatibility and signal outputs. Final meter selection should always be checked against the complete process conditions.
The CMAG measures and totalizes conductive-liquid flow in compatible pumped and gravity condensate systems. It may also be applied to hot water, chilled water, potable water and other compatible conductive liquids. In every application, the liquid must have conductivity of at least 3.0 µS/cm, and the flow tube must remain completely flooded during measurement. Gravity installations may require a piping wet leg to maintain a full meter tube.
Published accuracy is ±0.25% of reading when 1.5 pipe diameters of straight run are available upstream and downstream from the meter centreline. Without external straight-pipe run, published accuracy is ±0.50% of reading.
Published rangeability is typically 300:1 or better at ±0.25% accuracy, 400:1 at ±0.50% accuracy and 500:1 at ±1.00% accuracy. Proper sizing remains important when selecting the meter for expected minimum and maximum flows.
No. The full-bore magnetic flow tube provides an obstruction-free flow path with no moving measuring components. This avoids the mechanical wear associated with turbine and other moving-part meter technologies.
The liquid must be electrically conductive, with a published minimum conductivity of 3.0 µS/cm. Condensate, hot water, chilled water and compatible conductive process liquids may be measured when the selected liner, electrodes, pressure class and temperature rating suit the application. The flow tube must also remain completely flooded during measurement.
The meter applies Faraday’s law. Conductive liquid moving through the magnetic field generates a voltage proportional to its velocity. Electrodes detect that voltage, and the converter uses the meter’s individual K-factor to calculate volumetric flow.
Available outputs include a 4–20 mA analog signal and conditioned pulse output. Modbus and Profibus communications are also published as available. An optional LCD indicator/totalizer can display instantaneous and totalized flow locally.
Yes. The flow tube must remain completely flooded while measurements are being taken. An empty or partially filled tube will prevent dependable measurement. Gravity-fed condensate systems may require a piping wet leg to maintain a full meter tube throughout operation.
The uniform magnetic-field design is intended for installations where conventional flow profiling is limited. The meter may be installed in space-constrained piping arrangements, but the stated 1.5-diameter straight-run provision should be applied when ±0.25% accuracy is required.
The CMAG may be suitable for many retrofit installations because of its full-bore design, short straight-run requirement, wide turndown and choice of integral or remote electronics. Suitability must still be confirmed from the liquid conductivity, ability to maintain a completely flooded flow tube, available pipework, process temperature, pressure, materials and required accuracy.
Provide Cadillac Meter with the liquid type, conductivity, line size, flow range, operating temperature, pressure, installation arrangement, ability to maintain a completely flooded flow tube, available straight run, power supply and required outputs. These details allow the correct meter configuration to be checked before ordering.
Keep the complete CMAG Pumped and Gravity Condensate Meter technical guide for specification review, project discussions or purchasing enquiries. Cadillac Meter can also help verify the correct size, materials, electronics and model configuration for your application.
For efficient product selection, include the liquid type, conductivity, pipe size, flow range, operating temperature, pressure, available straight run, power supply and required outputs.
