Dynasonics D7700 User Manual

Series

Series D7700

Series Series

Insertion Doppler Ultrasonic Flow Meter

Operations & Maintenance

D7700

D7700D7700

Manual

REV 2/00

Location

QUICK-START OPE R ATING INSTRUCTIONS

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.

Pipe Preparation
and Mounting

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:

Rev. 12/97 -1- D77X

QUICK-START OPE R ATING INSTRUCTIONS

Insertion Depth =
(pipe I.D. inches) X 0.125 + 0.67 inches
or
(pipe I.D. mm) X 0.125 + 17 mm
B. Secure the probe insertion distance using the upper

and lower brass jam nuts located on the threaded
rods.

C. Loosen the set screw located in the probe retaining

collar with the enclosed allen wrench.

D. Rotate the probe body till the arrowhead, located

on the top of the probe, is parallel with the pipe and
points down stream in the direction of flow.

E. Lock the probe rotation with the set screw in the

retaining collar.

F. Route the transducer cable back to the transmitter,

avoiding locations near high voltage supply wires.
Transducer connections are made through the left
conduit hole in the bottom of the transmitter.

Connections

Startup

3. TRANSDUCER CONNECTION

A. DO NOT attempt to connect additional cable to the

factory supplied transducers.

B. Connect the transducer spade terminals to the

XDCR terminal block located on the lower left
corner of the main PCB.

4. INITIAL SETTINGS AND POWER UP

A. Route a stable, grounded power supply to the

transmitter. Power wiring is made through the right
conduit hole.

B. Connect Power to the upper right terminal block as

appropriate. Apply power.

C. If the D77 system is installed in a pipe full of flowing

liquid, the LED indicator D21 will begin to flash
steadily. If it does not, adjust R10 (GAIN) CW until
the LED just begins to flash.

Rev. 12/97 -2- D77X