Emerson Process Management 8732 Sensor Mounting, Upstream/Downstream Piping, Sensor Orientation

Rosemount 8732

Reference Manual

00809-0100-4663, Rev BA January 2010

SENSOR MOUNTING

Upstream/Downstream Piping

Figure 5-2. Upstream and

Downstream

Straight Pipe Diameters

Sensor Orientation

Figure 5-3. Vertical Sensor Orientation

Physical mounting of a sensor is similar to installing a typical section of pipe. Conventional tools, equipment, and accessories (bolts, gaskets, and grounding hardware) are required.

To ensure specification accuracy over widely varying process conditions, install the sensor a minimum of five straight pipe diameters upstream and two pipe diameters downstream from the electrode plane (see Figure 5-2).

5 Pipe Diameters	2 Pipe Diameters
FLOW

The sensor should be installed in a position that ensures the sensor remains full during operation. Figures 5-3, 5-4, and 5-5show the proper sensor orientation for the most common installations. The following orientations ensure that the electrodes are in the optimum plane to minimize the effects of entrapped gas.

Vertical installation allows upward process fluid flow and is generally preferred. Upward flow keeps the cross-sectional area full, regardless of flow rate. Orientation of the electrode plane is unimportant in vertical installations. As illustrated in Figures 5-3and 5-4,avoid downward flows where back pressure does not ensure that the sensor remains full at all times.

Installations with reduced straight runs from 0 to five pipe diameters are possible. In reduced straight pipe run installations, performance will shift to as much as 0.5% of rate. Reported flow rates will still be highly repeatable.

FLOW

FLOW

5-4