Cadillac® EMAG Magnetic Flow Meter

Cadillac®  EMAG Magnetic Flow Meter Applications

The Cadillac® EMAG 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.

Cadillac®  EMAG Magnetic Meter Features

The Cadillac® EMAG magnetic flow meter is the number one choice due to accuracy, rangeability, longevity, and modern electronics.

Accuracy

+/-0.5% of the reading for liquids. High accuracy allows significant improvement in both measurement and customer billing.

Rangeability

Typically 100 to 1 turndown or better. 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

Meeting the challenges of the next millennium. Meters are equipped with electronics capable of registering locally, remotely or interfacing with an energy management system. Built to withstand the toughest conditions.

Cadillac® EMAG Magnetic Flow Meter – Principles of Operation

To understand the operation principles for Cadillac® EMAG 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.

Cadillac®  EMAG Magnetic Meter – Dimensions

The Cadillac®  EMAG magnetic meter’s dimensions are outlined below. Please reference the letters with the chart for each meter size.

Cadillac®  EMAG Magnetic Flow Meter – General Specifications

Cadillac®  EMAG Magnetic Flow Meter includes the following specifications:

• Meter will consist of a full-bore body with encapsulated and rigidly retained set of coils.
• Meter available with remote or integral electronics with indication and totalization.
• Meter operates at +/- 0.5% accuracy with proper flow profiling or piping straight run.
• Meter available with pulse and analog (4-20 mA) outputs.
• Modbus-RTU or Profibus-PA communication available as an option
• Meter will provide instantaneous and totalized flow available at local indicator or remotely through outputs.
• Meter measures flow using Faraday’s law (Induce voltage is directly proportional to the velocity of the conductive liquid)
• Meter K-factor is stable and not influenced by external piping or mounting orientation.
• Meter will measure fluids with conductivity greater than or equal to 3.0 uS/cm2.
• Meter will have empty pipe detection and contact (DO) available for alarming.
• Meter power supply: 100-240 VAC, 50/60 Hz (Optional 24Vdc). Maximum power consumption approximately 19Watts.
• Meter will be calibrated to/and be provided with NIST calibration certificate.

Cadillac®  EMAG Magnetic Flow Meter – Installation

Installation requirements for the Cadillac®  EMAG are along the line of conventional magnetic flow meters with industry standard for flow profiling or piping straight run.

Employing an industry standard coil design within the flow tube the Cadillac® meter provides an economical alternative for those applications where the CMAG and its unique coil design and focusing plates are not required or necessary for the application.

The electronics for both the CMAG and EMAG are identical and provide high frequency DC square wave signal generation and flow signal sampling. Providing the high reliability and functionality available for a variety of flow applications.

In practice, installation requirements for the EMAG magnetic flow meter follow standard piping straight run requirements, which are listed as follows:

Downstream of the meter:

• Expander (2-5) diameters
• Tee – (2-5) diameters
• Elbow – (2-5) diameters
• Valves – (2-10) diameters

Upstream of the meter:

• Expander – (10) diameters
• Tee – (5) diameters
• Elbow – (5) diameters
• Valves – (10) diameters

Unlike other technologies such as the Cadillac® Vortex flow meter, magnetic flow meters do not have a low flow cutoff, essentially allowing the meter to read to zero. With such a wide flow range capability for the technology, most applications can be addressed with meters at full line size.

EMAG Model Code