CiDRA SONARtrac PW VF-100 - Manual (Page 26)

20831-01 Rev 05 Page 5-8
5.5.2 Determine the Pipe Inner Diameter (ID)
Record the nominal pipe size based on the pipe size and pipe
schedule, as this will be input into the transmitter.
Alternatively, measure and calculate the pipe ID. Accurately measure
the pipe outside diameter (OD). Use an ultrasonic thickness
measurement gauge to determine the wall thickness (t
w
) at a minimum
of 4 locations equally spaced around the pipe and average the
measurements. Calculate the pipe inner diameter (ID = OD
– (2t
w
)).
(There are several vendors of ultrasonic thickness gauges.)
Note: The accuracy of the pipe inner diameter measurement is critical
for high accuracy flow rate measurements as there is a direct
correlation between this measurement and the reported flow rate.
5.6 Sensor Band Installation
It will be helpful to have a second person available to assist with
holding the sensor assembly in position during installation.
Note: Prior to installing the sensor band, remove and save the plastic
bag from the sensor band that contains two sensor calibration factor
labels. These will be used as described later in this manual for input
to the transmitter.
Ensure there is no dirt or other foreign material on the sensor
assembly. Remove dirt or foreign matter using a clean cloth
dampened with water.
If the sensor band was shipped with a sensor band shorting plug
installed on the sensor band to preamplifier cable connector, ensure
the sensor band shorting plug is installed on the sensor band cable
prior to installing sens
or band. Sensors bands with an ‘R” in the Part
Number suffix (e.g. Part #: 20686-26-R) do not require a shorting plug.
5.6.1 Non-HD / Non-Segmented Product Sensor Band
Installations
Position the passive sonar meter sensor band assembly on the pipe
with the polyimide film (amber colored) against the pipe surface. If
possible, orient the flow direction arrow on the sensor assembly with
the direction of flow within the pipe. Note: If this is not possible due to
installation constraints, e.g. access to sensor fasteners, install
opposite to flow direction. The transmitter must be re-configured for
“reverse flow” during its set up as detailed in the Transmitter Startup &
Operation Section of the manual.