- Home
- Companies
- Central Station Steam Company
- Products
- Cadillac - Model CMAG - Magnetic Flow ...
Cadillac - Model CMAG -Magnetic Flow Meter
The Cadillac CMAG magnetic flow meter is capable of measuring liquids of all types and consistency while providing an obstruction free flow path. Due to its unique flow tube/coil design, it is particularly suitable for new or retrofit into hot and chilled water systems where high accuracy is required and/or limited flow profiling or piping straight run is available. Employing a unique coil winding pattern and containment/focusing plates the Cadillac® magnetic flow meter does not require any flow profiling or piping straight run while still meeting the stated meter accuracy (+/-0.25% of rate). In any liquid measuring system the Cadillac® magnetic flow meter is the number one technology choice due to Cadillac’s® accuracy, linearity, reliability and rangeability.
Like many other flow meters, the Cadillac® magnetic flow meter is a velocity measuring device which computes flow by multiplying the effective cross sectional area of the flow meter with the detected fluid velocity. The meter has no moving parts and consists of a meter body with encapsulated coils, electrodes and an amplifier assembly. It detects velocity by measuring an induced voltage that is developed by moving the conductive fluid through a magnetic field.
The Hot/Chilled Energy Water Flow Meter of Choice
With its limited flow profiling or piping straight run requirement the CMAG makes an excellent choice for both Hot and Chilled water energy applications. The CMAG design will allow easy retrofit into tight mechanical rooms and basements, without affecting the measurement accuracy. In addition, the CMAG has the industry best turn-down at 300:1, which is ideal for the modulating flow rates common today with energy saving variable speed pumping systems.
The Water and Wastewater Industry Standard
With its limited flow profiling or piping straight run requirement the CMAG makes an excellent choice for both water and wastewater applications. With line sizes common above 16 inches the CMAG allows new designs to eliminate long piping straight runs in order to get an accurate and reliable flow measurement. This significantly reduces the footprint of a building or other areas where the flow meters would be mounted. With increased wetted material selections most Water, including potable, applications have also looked to magnetic flow meters as the preferred choice, especially in applications requiring analog (rate) or pulse (totalized) outputs.
The Cadillac® CMAG magnetic flow meter is a totalizing device that is capable of measuring liquids of all types and consistency while providing an obstruction free flow path. This meter can be applied effectively for the following purposes:
- Data Source for energy management system, DCS, district-wide systems.
- Cooling tower Water flow.
- Potable Water flow.
- General industrial and domestic Water flow.
- Industrial and domestic Wastewater flow.
- Aquifer injection Water flow.
- Process Water flow.
- Water based Coolant flow.
- Water based Slurry flow.
- Reclamation Water flow.
- Clarifier Water flow.
The Cadillac® CMAG pumped condensate flow meter is the number one choice due to accuracy, rangeability, longevity, modern electronics, and independent flow profile.
Accuracy
+/-0.25% of the reading for liquids with 1.5 pipe diameters of piping straight run up and downstream from the meter’s centerline.
+/- 0.50% of reading for liquids without any piping straight run at all
Rangeability
Typically 300 to 1 turndown or better at +/- 0.25% accuracy, 400 to1 turndown at +/ 0.50% accuracy, 500 to 1 turndown at +/- 1.00% accuracy With seasonal heating/cooling load variation, the need for a large turndown is essential. Cadillac® magnetic flow meters will accurately measure all load requirements with proper sizing.
Longevity
Mean time between failure (MTBF) of 40 years. With no moving parts and through simple robust design the meter has unmeasured life expectancy.
Modern Electronics
All Meters are equipped with electronics capable of registering locally, remotely or interfacing with an energy management system. With Modbus and Profibus communications now available the electronics now provide a true digital output to any energy management system.
Flow Profile Independent
The flow meter does not require traditional flow conditioning or piping straight run. .. Piping straight run from the centerline of the meter is 1.5 pipe diameters, which is essentially the mating flange face of the piping system in CMAG meters under 6” in size.
To understand the operation principles for Cadillac® CMAG Magnetic Flow Meter, it’s important to define Faraday’s law. It states that when you move a conductor perpendicular through a magnetic field, a voltage will be induced proportional to the velocity of the conductor. A magnetic field is created by a set of coils which are encapsulated and rigidly retained in the meter flow tube and, when a conductive liquid moves through that magnetic field, a pair of electrodes measures the voltage induced by the movement of the liquid. The measurement is independent of conductivity changes in the liquid as long as it remains above the minimum threshold of 3 uS/cm2.
The relationship between the liquid velocity and the induced voltage is expressed in a meter K-factor. The meter K-factor is unique to each and every meter and is documented during a NIST traceable flow test completed prior to shipment. With the K-factor established a highly accurate volumetric flow is calculated by multiplying the cross sectional area of the flow tube by the measured liquid velocity. This volumetric relationship can then be converted to various engineering units and the flow meter converter can then retransmit this information with a 4-20 mA current signal and/or conditioned pulse. An optional integral LCD Indicator/Totalizer is available to locally display and totalize in whatever engineering units preferred.