Technical Guide
August 2007
THE DANIEL® SERIES 1200 AND 1500 LIQUID TURBINE FLOW METER SYSTEMS
The Daniel Series 1200 and 1500 Liquid Turbine Flow Meter Systems combine turbine meters and electronic instrumentation to measure volumetric total flow and/or flow rate. Each Daniel turbine meter comprises of a cylindrical housing containing a precise turbine rotor assembly. The magnetic pickoff, or pickoffs, are mounted in a boss on the meter body. As fluid passes smoothly through the flow meter, it causes the rotor to revolve with an angular velocity proportional to flow. The rotor blades or rim buttons passing through the magnetic field of the pickoff generate a pulsing voltage in the coil of the pickoff assembly. Each voltage pulse represents a discrete volume. The total number of pulses collected over a period of time represents the total volume metered.
The sinusoidal signal from each pickoff has low amplitude and may not normally be relied upon for transmission distances over 20 feet (6 meters). The signal must, therefore, be amplified. This is achieved with a preamplification board mounted on the turbine meter. These pulse signals are typically transmitted to control room instrumentation such as flow computers, and may also be required to input to prover computers which calculate, display, transmit, control or record the flow sensed by the rotor. The results may be displayed as
All Daniel Series 1200 and 1500 Liquid Turbine Flow Meters have, as standard, the Universal Mounting Box (UMB) which may be fitted with one or two pickoffs and the dual channel preamplifier. The pickoff mountings are oriented so that the outputs from the pickups are 90º electrically out of phase. The Daniel Series 1500 Liquid Turbine Flow Meter may be supplied with two UMBs, offering up to four pulse outputs. Alternate pairs across the 2 UMBs are also 90º electrically out of phase.
Figure 2 - Liquid Turbine Flow Meter System
Flow Computer
Daniel manufactures the Series 1200 and 1500 Liquid Turbine Flow Meters, the adjacent tube sections, and the electronic instrumentation. Each meter is precisely flow calibrated before shipment.
The Meter Systems are used to provide measurement information in fluid transport, petroleum and chemical processing, custody transfer of liquids, blending systems, and in product batching in field or plant operations. The repeatability of the systems ensures quality measurement of fluids over a wide range of flow rates, temperatures, compositions and viscosities.
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