Emerson TG-0807 manual Rimmed Rotors for Higher Resolution

Technical Guide

DAN-LIQ-Turbine Meter-TG-0807

August 2007

RIMMED ROTORS FOR HIGHER RESOLUTION

In the larger diameter Daniel Series 1500 Liquid Turbine Flow Meter (normally above 6” in line size), the resolution provided by a blade-type motor may be improved by the use of a rimmed (or shrouded) rotor. This construction is standard for Daniel meters of 8” and up. A lightweight stainless steel rim (or shroud) carries small paramagnetic buttons which provide a greater resolution of flow by generating more pulses per unit volume.

Daniel Series 1200 and 1500 Liquid Turbine Flow Meters are supplied with one Universal Mounting Box (UMB) as standard. This is attached to a boss, which in turn is attached to the meter body. This assembly may house two pickoffs, which are oriented such that their outputs are 90º electrically out of phase.

Figure 7 - Daniel® Series 1500 Liquid Turbine Flow Meter internals showing standard rimmed rotor

Figure 8 - Daniel® Series

1500 Liquid Turbine Flow Meter internals showing high resolution rotor

The Daniel® Series 1500 Liquid Turbine Flow Meter is also offered with a high resolution rotor. This rotor is designed with slots in the rim in place of paramagnetic buttons and provides a higher number of pulses per unit volume than the standard rotor which enables proving with a smaller pipe size prover.

Page