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Cadillac - Model CMAG -Pumped and Gravity Condensate Meter
Since its introduction, the Cadillac Magnetic Flow Meter has quickly become acknowledged as the industry standard for both pumped and gravity condensate measurement.
The Cadillac® CMAG condensate and gravity magnetic flow meter has been designed specifically for the requirements of retrofit in pumped and gravity applications. With a unique flow tube design that distributes the voltage generated by the induced magnetic field evenly throughout the entire flow tube area, the Cadillac® CMAG is able to accurately measure flows in just about any location it can physically be installed. With unprecedented low flow capabilities and a 300:1 turndown at +/- 0.25% of rate or reading accuracy it provides the most versatile and accurate volumetric flow measurement available. The only installation requirement for the CMAG is that the flow tube is completely flooded when measuring, and that 1.5 pipe diameters of straight run up and downstream of the meter centerline are available. (In gravity applications it may be required to install a piping “Wet Leg” to ensure the flow tube is flooded at all times) If 1.5 diameters from centerline are not available (2” meter size and below the 1.5 diameter straight run requirement is met by the flow tube itself) then the meter becomes a +/- 0.50% accurate device without any piping straight run or flow profiling of any kind. In any condensate system the Cadillac® CMAG magnetic flow meter has quickly become the number one technology choice due to Cadillac®’s accuracy, linearity, reliability and rangeability.
The New Industry Standard
Historically, liquid flows have been measured by mechanical or differential pressure producing flow devices/meters. However, as with any mechanical system, the meters are subject to wear and tear and require regular maintenance and calibration. Worse most of these technologies have very limited turndown capabilities, which mean that either accuracy suffers or the meters no longer measure when flows drop below certain velocity thresholds. The Cadillac® CMAG eliminates all of these problems with no moving parts, a much higher accuracy (+/- 0.25% of rate) and a 300:1 turndown, effectively rendering all mechanical flow meters obsolete.
The Cadillac® CMAG condensate 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:
- Gravity or Pumped Condensate applications where precise flow measurements are required.
- Hot or Chilled water energy measurements where high accuracy is required or where there is limited piping straight run or flow profiling exists.
- Domestic Hot water where modulating flows require very high turndown capabilities, while maintaining high accuracies.
- Domestic drinking or potable water applications where modulating flows require very high trun-down capabilities, while maintaining high accuracies.
- Any fluid with a conductivity above 3 uS/cm2, process temperatures below 350ºF and pressures at or below ANSI 300 Lb rating
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 to 1 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.
Cadillac® CMAG Pumped Condensate Meter – Principles of Operation
To understand the operation principles for Cadillac® CMAG Condensate 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.