GE PanaFlow XMT1000, User Manual

Page: 17 / 96

PanaFlow™ XMT1000 User’s Manual 5
Chapter 1. Installation
1.4.4 Local Mounting
The XMT1000 accuracy is affected by the flowcell location in the process piping and on the orientation of the
transducers. Thus, in addition to accessibility for maintenance, adhere to the following installation guidelines:
•
Locate the flowcell so that there are at least 10 pipe diameters of straight, undisturbed flow upstream and
5 pipe diameters of straight, undisturbed flow downstream from the measurement point (see
Figure 4 below).
Undisturbed flow means avoiding sources of turbulence in the fluid (e.g., valves, flanges, expansions, elbows,
etc.), avoiding swirl, and avoiding cavitation.
Figure 4: Minimum Straight Run Pipe Requirements
•
Locate the transducers on a common axial plane along the pipe. Also, locate them on the side of the pipe
instead of on the top or the bottom, because the top of the pipe tends to accumulate gas and the bottom tends to
accumulate sediment. Either condition will cause unwanted attenuation of the ultrasonic signals. There is no
similar restriction with vertical pipes, as long as the fluid flow is upward to prevent free falling of the fluid or a
less than full pipe (see
Figure 5 below).
Figure 5: Good and Bad Flowcell/Transducer Orientations
CAUTION! Do not place thermal insulation on or around the transducers, the junction boxes, or the
meter electronics. The transducer and junction box act as a heat sink that protects the transducer
from high and low temperatures.
Flow Direction
10D 5D
BAD
Vertical
GOOD
Flow D
ire
ct
ion
Flow D
ir
ect
io
n
Flowcell
Flow Direction
GOOD
BAD
Horizontal
Flowcell