Dynasonics D7700 Series Insertion Doppler Ultrasonic Flow Meter - Manual (Page 2)

Rev. 12/97 -1- D77X
This manual contains detailed operating instructions for
all aspects of the D77X instrument. The following
condensed instructions are provided to assist the
operator in getting the instrument started up and running
as quickly as possible. This pertains to basic operation
only. If specific instrument features are to be used or if
the installer is unfamiliar with this type of instrument,
refer to the appropriate section in the manual for
complete details.
1. TRANSDUCER LOCATION AND PIPE
PREPARATION
A. Select an appropriate mounting location for the
DT7 transducer probe.
B. The probe should be located on a straight piece of
pipe with a minimum of 10 unobstructed pipe
diameters upstream from the installation point and
a minimum of 5 unobstructed diameters
downstream of the installation point.
C. A 1-1/2” NPT female threaded connection on the
pipe is required for the probe assembly to be
mounted. This connection is typically made by
welding a threaded coupling to the pipe wall or
installing a pipe saddle. The connection should
be mounted perpendicular to the pipe at a radial
location 20-160 degrees from the top of the pipe.
2. TRANSDUCER INSTALLATION
DO NOT remove the cotter pins located at the ends
of the threaded rods. They prevent the probe from
being completely extracted from the insertion fitting
and causing a potentially dangerous condition.
A. Insert the DT7 Transducer Probe tip to the 1/8
pipe I.D. location. The velocity measurement is
made 0.67 inches [17 mm] from the very tip of the
probe. Total insertion depth can be calculated at:
Location
Pipe Preparation
and Mounting
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