Dynasonics 771, 771C User Manual
Series
Series 771/771C
Series Series
Insertion Ultrasonic Flow Meter
Operations & Maintenance
771/771C
771/771C771/771C
Manual
REV 12/97
Location
QUICK-START OPERATING 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 t o 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 OPERATING 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, groun ded power supply to the
transmitter. Power wiring is made through the right
conduit hole.
B. Connect Power to the upper right t erminal block as
appropriate. Apply power.
C. Press the RESET key on the keypad.
D. If the pipe is full of a flowing liquid, the default
readings will be FPS (Feet per Second).
Rev. 12/97 -2- D77X
TABLE OF CONTENTS
Pages
Quick-Start Operating Instructions 1-2
Part 1 - Introduction
Part 2 - Installation
Introduction
General 3
Applications 3
Model Matrix 5
Product Specifications 7-8
Bench Test Procedure 9-10
Installation
Transducer Mounting Locations 11-18
Probe Retracting 19
Transmitter Installation 20-21
Electrical Connections 22-23
Part 3 - Startup and
Configuration
Rev. 12/97 -3- D77X
Instrument Startup and Configuration
Initial Settings 24
Keypad Operations 25-36
TABLE OF CONTENTS
Pages
Part 4 - Troubleshooting
Part 5 - Appendices
Trouble Shooting Guide 37-38
Appendices 39+
Spare Parts Listing
Face Plate Drawing
Pipe Dimension Chart: Cast Iron
Intrinsic Safety Connections
Pipe Dimension Chart: ST, SS, PVC
Velocity to Volumetric Conversion Chart
Statement of Warranty
Customer Service
Rev. 12/97 -4- D77X
PART 1 - INTRODUCTION
General
Application Versatility
User Safety
The D77 ultrasonic flow meter is designed to measure the
fluid velocity of liquid within closed conduit. The rugged
insertion probe has no moving parts, is insensitive to
coating buildup and can be accurately positioned at the
precise depth in the pipe required to measure liquid
velocity in a variety of liquid phases. (Conventional,
through the pipe wall, Doppler flow meters are sensitive
to large changes in liquid viscosity and solids content.
The D77 is not sensitive to such changes.)
The flow meter operates by transmitting an ultrasonic
sound from its transmitting piezoelectric crystal into the
flowing liquid. The sound will be reflected by suspended
particles or bubbles within the liquid and recorded by the
receiving piezoelectric crystal. A frequency shift (Doppler
effect) will occur that is directly related to the speed of the
moving particle or bubble. This shift in frequency is
interpreted by the instrument and converted to various
user defined measuring units.
The D77 flow meter can be successfully applied on a wide
range of metering applications. The simple to program
transmitter allows standard D77 to be used on pipe sizes
ranging from 1.5 - 120 inch [ 38 - 3048 mm ] pipe I.D. A
variety of liquid applications can be accommodated: raw
sewage, reclaimed water, cooling water, river water, plant
effluent, mining slurries, sludge, etc. The D77 is ideal for
measuring through thick walled pipes. The D77C is
designed specifically for Crude Oil measurements.
Because the transducers are encapsulated in a resilient
PVDF plastic shell and have no moving parts (in the
traditional sense), the flow meter is very resistant to
fouling and wear. Standard transducers are rated to
180?F [82?C].
The D77 employs modular construction and provides
electrical safety for the operator. The display face
contains voltages no greater than 15 Vdc and the
enclosure is made from non-conductive fiberglass. All
user connections are made through conduit hole located
on the under side of the D77 enclosure.
Rev. 12/97 -5- D77X
PART 1 - INTRODUCTION
Battery Backup
Product Identification
Product Matrix
A rechargeable nickel-cadmium battery on the back of
the display board retains all user-entered configuration
values in memory for several years (at 25?C), even if
power is lost or turned off. The ten year battery is
continually trickle charged whenever line power is
applied. A completely discharged battery recharges fully
after 48 hours of instrument operation.
The serial number and complete model number of your
D77 is located on the inside of the transmitter’s cover.
Should technical assistance be required, please provide
the Dynasonics' Customer Service Department with this
information.
Rev. 12/97 -6- D77X
PART 1 - SPECIFICATIONS
Description Specification
Power Requirements (Std) 110/220 VAC 50/60 Hz ? 5%. (Opt)
100/200 VAC 50/60 Hz ? 5% and 12/24
VDC. Power consumption less than 12 VA.
Velocity 0.12 - 30 FPS [ 0.03 – 9.1 MPS]
Outputs 4-20 mA, 1000 Ohms max., Isolated.
12 Vdc pulse, 100 ?S duration, 10 Hz max,
pulses with totalizer increments
Two Relays, 5A @ 250VAC resistive, SPDT
Display 2 line x 20 character alphanumeric LCD,
back lit. Digit height 0.2 inches [ 5 mm]
6 digit rate, 8 digit totalizer (resettable)
Units:
Rate US [Metric]
Totalizer US [Metric]
Ambient Conditions -22 to 160°F [ - 30 to 70 °C], 0-95% relative
Enclosure NEMA 4X, [IP-65] Fiberglass w/SS
User configured
FPS, GPM, GPH, ft.3/M, MGD, BPM, BPH,
BPD [ MPS, LPM, M3/hr, LPD ]
Gallons, barrels (crude oil) [ liters ]
humidity, non -condensing.
hardware.
11H x 9.25W x 5.5D inches
[280H x 235W x 140D mm]
Rev. 12/97 -7- D77X
PART 1 - SPECIFICATIONS
Non-linearity (Accuracy) ?2% Full Scale
Sensitivity 0.05% of Full Scale
Repeatability ?0.2% of Full Scale
Response Time 5-50 seconds, user configured, to 90% of
value, step change in flow.
Security Keypad lockout, access code enable
DT7 Insertion Probe
Description Specification
Liquid Requirements 25 ppm of 30 micron suspended solids or
bubbles minimum
Transducer to Transmitter Distance (Std) 15 feet [ 4.6 meters ], flexible armored
conduit. (Opt) lengths to 300 feet [ 90
meters ]
Pipe Sizes (Std.) 1½ - 120 inches [ 38 – 3050 mm ]
Pipe I.D.
Temperature (Std) - 40° to 180°F [ -40° to 82°C].
Housing Material (Std) 316 ss, PVDF, Viton™, Teflon™
Mounting (Std) 1½ MNPT, pipe saddle or female
threaded coupling required. (Opt) 1½ 150#
Approvals (Opt) FM approval I.S., Class I, Div 1,
Groups A-G.
Rev. 12/97 -8- D77X
PART 2 - PRE-INSTALLATION CHECKOUT
Unpacking
Functional Test
After unpacking, it is recommended to save the shipping
carton and packing materials in case the instrument is
stored or re-shipped. Inspect the equipment and carton
for damage. If there is evidence of shipping damage,
notify the carrier immediately.
The D77 flow meter can be checked for basic
functionality using the following Bench Test procedure.
It is recommended that this operation be performed
before permanently installing the system.
Procedure:
1. Open the D77 transmitter cover.
2. Connect the transducer cable connector to the
terminal locations on the lower left corner of the D77
main circuit card. See Figure 1.
3. Connect supply power to the appropriate terminal
locations on the upper right corner of the main circuit
card. See Figure 2.
4. Apply power.
5. Verify that the display indicates 0.00 FPS (or 0.0 flow
Figure 1
Figure 2
Rev. 12/97 -9- D77X
rate of any other unit). If the display does not register
0.0, then press the 2nd FUNCT key, then press
SIGNAL STR. Verify th at SIGNAL STR. is lower than
000100. If SIGNAL STR. is greater than 000100,
verify that the sensor/transmitter are not located near
electrically noisy components. (VFDs, inverters,
motors, power relays, etc) Verify that DT7 transmitter
connections are pr oper and secure. If the SIGNAL
STR. remains greater than 000100, consult the
Dynasonics Factory for assistance.
6. Press the 2nd FUNCT key to enter SERVICE MODE.
Press the SIGNAL STR key to display SIGNAL STR.
XXXXXX.
7. Tap the rounded black tip of the DT7 transducer on
the side facing opposite the flow direction arrow (the
arrow is located on the top cap of the DT7
PART 2 - PRE-INSTALLATION CHECKOUT
transducer) with the handle of a screwdriver or similar
blunt instrument.
8. Verify that signal strength increases with frequency of
the tapping. Typical increases will range from 20-30
counts.
9. Verify that signal strength decreases when tapping
ceases.
Bench Test is Complete
Rev. 12/97 -10- D77X
PART 2 - TRANSDUCER INSTALLATION
Transducer Mounting
Considerations
Step A - Mounting
Locations
The DT7 insertion transducer that is utilized by the D77
contains piezo electric crystals for transmitting and
receiving ultrasonic sound energy. The black PVDF
plastic tip of the DT7 contains these crystals, which are
designed to be inserted to the average fluid velocity point
within a pipe. Not all liquid within a pipe is flowing at a
uniform fluid velocity. But, a straight run of pipe, full of
flowing liquid, contains a predictable liquid velocity profile.
By selecting proper upstream and downstream lengths of
straight pipe from the transducer installation point and
precise insertion depths into the pipe, very accurate and
reliable volumetric flow rates and totals can be realized.
Select a transducer mounting location with adequate
straight runs (without disturbances) of pipe, both upstream
and downstream, to achieve stable and accurate readings.
Examples of minimum upstream and downstream
requirements are included in Table 1. Note that if
adequate straight plumbing cannot be provided the D77
system will operate repeatably, but will probably not
achieve ideal accuracy.
When installing the DT7 transducer in a horizontal pipe,
the preferred orientation is at least 20 degrees from the
top or bottom of the pipe. Ensure that the mounting
location allows for adequate clearance to install and
retract the probe fully from the pipe.
Rev. 12/97 -11- D77X
PART 2 - TRANSDUCER INSTALLATION
Table 1
Straight Pipe Recommendations
1
1
The D77 system will provide repeatable measurements on piping systems that do not
meet these requirements, but the accuracy of these readings may be influenced to various
degrees.
Rev. 12/97 -12- D77X
PART 2 - TRANSDUCER INSTALLATION
Step B - Hot Tapped
Installation
The installation instructions cover Hot-Tapped
installations (installations where it is required to install or
remove the transd ucer probe without shutting down the
process pressure). If the product is being installed
without an isolation valve, ignore the steps that pertain to
its installation. Figure 3 illustrates an exploded view of
an isolation valve assembly and names the various
components.
If the DBV or DSSV accessory kits were ordered with the
DT7 probe, a Hot-tapped installation can be conducte d.
The kits include an isolation valve assembly and is
designed for installation in pipes under pressure, up to
700 psi at 70? F.
All items required for installation are provided with the kit,
except for the 1.5" NPT weld coupling or service saddle
and the drilling and welding equipment. These
instructions call for the use of a drilling machine
designed for operations under pressure (for example,
Muller Co., Decatur, Illinois).
Rev. 12/97 -13- D77X
ine to be used.
pe sealants.
PART 2 - TRANSDUCER INSTALLATION
Step C - Component
Assembly
Procedures are as follows:
1.Verify that the pipe’s line pressure is
rated limits of the pressure drilling mach
2. Grind off paint or other coatings from the pipe in the
area where the DT7 Probe Assembly is to be
installed. Recommended minimum straight pipe
lengths for best accuracy are 10 diameters upstream
and 5 downstream.
3. Tack weld a 1 ½"NPT weld coupling to the pipe or
install service saddle according to the suppliers
instructions. The coupling or saddle must be aligned
perpendicular to the pipe axis and square to its plane.
4.Complete welding. A water tight, 0.25"
weld bead is recommended.
5.Install the close nipple (supplied with
into the weld coupling. Use appropriate pi
6.Install the isolating ball valve on the
close nipple. Verify that the valve is in fully open position.
7.Install drill bit and adapter into the
pressure drilling machine. Then attach the machine to the
isolation valve.
8. Drill through the pipe wall in accordance with the
instructions supplied with the drilling machine.
9. Withdraw the drill bit through the isolating valve.
Close the valve and remove the drilling machine.
Check for leakage at valve and connections.
10. Place pipe sealant on the 1-½” NPT threads of the
Insertion Fitting assembly. Screw the assembly into
the isolation valve and tighten with a 2-½” Pump
wrench.
Rev. 12/97 -14- D77X