dynasonics 901 Series Manual

Rev. 03/98 -1- D901/M
This manual contains detailed operating instructions for all as-
pects of the D901/M instrument. The following condensed in-
structions are provided to assist the operator in getting the in-
strument started up and running as quickly as possible. This
pertains to basic operation only. If specific instrument fea-
tures are to be used or if the installer is unfamiliar with this
type of instrument, refer to the appropriate section in the man-
ual for complete details.
1. TRANSDUCER LOCATION
A. Determine the appropriate mounting location for the
transducers by referring to Figure 1.
2. PIPE PREPARATION AND TRANSDUCER
MOUNTING
A. The piping surface, where the transducers are to be
mounted, needs to be clean and dry. Remove loose
scale, rust and paint to ensure satisfactory acoustical
bonds.
B. Connect the mounting straps around the pipe. Leave
the strap loose enough to slip the transducers under-
neath.
C. Apply a liberal amount of silicone rubber (enclosed)
onto the transducer faces and the prepared areas of
the pipe.
D. Place each transducer under the mounting strap, 180°
apart on the pipe. Ensure that the transducer cables
Location
Pipe Preparation
and Mounting
QUICK-START OPERATING INSTRUCTIONS
Solids Bearing or Aerated Liquids
Clean Liquids
Figure 1 Transducer Locations

Rev. 03/98 -2- D901/M
are facing the same direction. See Figure 2.
E. Route the transducer cable back to the transmitter,
avoiding locations near high voltage supply wires.
3. TRANSDUCER CONNECTION
A. Do not attempt to add additional cable to the transduc-
ers.
B. Connect the spade terminals to the appropriate terminal
block within the transmitter.
4. INITIAL SETTINGS AND POWER UP
A. Set the SENSITIVITY control to - 2. See picture at left.
B. Apply AC power. The POWER indicator will illuminate.
C. If the pipe is full of a flowing liquid, the SIGNAL
STRENGTH meter will indicate and the READ indicator
will illuminate.
D. Adjust the SENSITIVITY control so that the right-most
green LED just comes ON.
E. The default display indicates fluid velocity as either FPS
or MPS. Refer to the appropriate place in this manual
for specific features and options.
Startup
Connections
QUICK-START OPERATING INSTRUCTIONS
Figure 2 Transducer Direction

Rev. 03/98 -3- D901/M
TABLE OF CONTENTS
Pages
Quick-Start Operating Instructions 1-2
Introduction
General 5
Applications 5
Model Matrix 6
Product Specifications 7-8
Bench Test Procedure 9
Installation
Transducer Mounting Locations 10-12
Pipe Preparation 13
Transducer Mounting 13-15
Transmitter Mounting 16-17
Electrical Connections 17-19
Instrument Startup and Configuration
Initial Settings 20
Modes of Operation 21
Pipe I.D. Input 22
Full Scale Input 23
Totalizer Exponent Input 24
Engineering Units Input 25
Part 1 - Introduction
Part 2 - Installation
Part 3 - Startup and
Configuration

Rev. 03/98 -4- D901/M
TABLE OF CONTENTS
Pages
Instrument Startup and Configuration
CAL. Constant Input 26
Display Damping 27
System Damping 27
TEST Diagnostic Key 27
System and Totalizer RESET 28
Totalizer Reset 28
Trouble Shooting Guide 29-30
Appendices 31+
Face Plate Drawing
Intrinsically Safe Installation
High-Temperature Transducers
Clean Liquid Installation Guide
Multiple Unit Cross-talk
Pipe Dimension Chart: Cast Iron
Pipe Dimension Chart: ST, SS, PVC
Velocity to Volumetric Conversion
Statement of Warranty
Customer Service
Part 4 - Troubleshooting

Rev. 03/98 -5- D901/M
PART 1 - INTRODUCTION
The D901/M ultrasonic flow meter is designed to measure
the fluid velocity of liquid within closed conduit. The trans-
ducers are a non-contacting, clamp-on type, which will
provide benefits of non-fouling operation and ease of in-
stallation.
The flow meter operates by transmitting an ultrasonic
sound from its transmitting transducer through the pipe
wall into the flowing liquid. The sound will be reflected by
suspended particles or bubbles within the liquid and re-
corded by the receiving transducer. A frequency shift
(Doppler effect) will occur that is directly related to the
speed of the moving particle or bubble. This shift in fre-
quency is interpreted by the instrument and converted to
various user defined measuring units.
A unique feature of this product is that it employs a pro-
prietary digital filtering system and recognition circuit.
This feature allows the instrument to measure fluid veloci-
ties of clean liquids if the transducers are mounted down-
stream from a 90°elbow. The non-symmetrical hydraulic
turbulence which occurs downstream of an elbow is cap-
tured, linearized and can be displayed as liquid velocity
and volume. This capability is not available in conven-
tional Doppler technology.
The D901/M flow meter can be successfully applied on a
wide range of metering applications. The simple to pro-
gram transmitter allows the standard product to be used
on pipe sizes ranging from 1 - 120 inch [ 25 - 1524 mm ]
pipe I.D. (With the small pipe transducer option, the pipe
size range is 0.25 - 1 inch [ 6 - 25 mm]). A variety of liquid
applications can be accommodated: raw sewage, re-
claimed water, cooling water, river water, plant effluent,
mining slurries, sludge, etc. Because the transducers are
non-contacting and have no moving parts, the flow meter
is not affected by system pressure, fouling or wear. Stan-
dard transducers are rated to 180°F [82°C]. Optional high
temperature transducers are rated to operate to 400°F
[204°C].
General
Application Versatility

Rev. 03/98 -6- D901/M
PART 1 - INTRODUCTION
The D901/M employs modular construction and provides
electrical safety for the operator. The display face con-
tains voltages no greater than 9 Vdc and the metal work
is electrically connected to Earth Ground. The display
face swings open to allow access to user connections.
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 con-
tinually 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
D901/M is located on the inside of the transmitter’s front
cover. Should technical assistance be required, please
provide the Dynasoncs’ Customer Service Department
with this information.
User Safety
Battery Backup
Product Identification
Product Matrix

Rev. 03/98 -7- D901/M
PART 1 - SPECIFICATIONS
Ambient Conditions Transmitter - -22 to 122°F [ - 30 to 50 °C],
0-95% relative humidity, non-condensing.
Transducers - - 40°to 180°F [ -40°to 82°C]
Standard. Optional: - 40°to 400°F [ - 40°to
204°C]
Display 2 line x 20 character alphanumeric LCD,
back lit. Digit height 0.2 inches [ 5 mm]
Transducer to Transmitter Distance Standard: 20 feet [ 6.09 meters ], flexible
armored conduit. Optional lengths to 300
feet [ 100 meters ]
Power Requirements 110/220 VAC 50/60 Hz ±5%. Optional:
100/200 VAC 50/60 Hz ±5% and 12VDC.
Power consumption less than 12 VA.
Pipe Sizes 1 - 120 inches [ 25 - 1524 mm ] Pipe I.D.
Optional: 0.25 - 1 inch [6 – 25 mm ], Small
Pipe Transducer
Velocity 0.5 - 20 FPS [ 0.5 - 6.08 MPS]
Measuring Units FPS, GPM, MGD [ MPS, LPM, M3/Hr ]
Indicators Power, Signal Strength, Fault, Over-range,
Read
Liquid Requirements 25 ppm of 30 micron* suspended solids or
bubbles.
* Less than this minimum will require
transducer mount downstream of a 90°

Rev. 03/98 -8- D901/M
Outputs 4-20 mA, 600 Ohms max., Isolated.
12 Vdc pulse, 50 µS duration, 0-0.15 Hz to
0-2.5 Hz, user adjustable.
Non-linearity ±2 % Full Scale
Sensitivity 0.4 % of Full Scale
Repeatability ±0.4% of Full Scale
Response Time 5-50 seconds, user configured adjustable,
to 90% of value, step change in flow.
Enclosure NEMA 4X, [IP-65] Fiberglass w/SS
hardware.
Size 12H x 10W x 4D inches
[305H x 254W x 127D mm]
Mounting Wall mount
Weather Shield Optional weather visor; Dynasonics P.N.
D003-899-001
Net Weight 15 lbs. [ 6.8 Kg ]
PART 1 - SPECIFICATIONS

Rev. 03/98 -9- D901/M
PART 2 - PRE-INSTALLATION CHECKOUT
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 D901/M flow meter can be checked for basic func-
tionality using the following Bench Test procedure. It is
recommended that this operation be performed before
installing the transducers or transmitter permanently.
Procedure:
1. Open the D901/M transmitter enclosure and the inner
display door.
2. Connect the transducer cable terminals to the corre-
sponding terminal block locations within the transmit-
ter. See Figure 3.
3. Set the transmitter SENSITIVITY control [located on
the display door] to -2.
4. Apply power.
5. Hold the transducers, the flat sides facing each other,
approximately 6-8 inches [150-200 mm] apart.
6. Move the transducers towards and away from each
other 1 inch [25mm] for several cycles at approxi-
mately 1 second interval.
7. If unit is functioning properly, the READ LED will illu-
minate and the rate display will indicate flow read-
ings.
Bench Test is Complete
The transducers that are utilized by the D901/M contain
Unpacking
Functional Test
Figure 3

Rev. 03/98 -10- D901/M
piezo electric crystals for transmitting and receiving ultra-
sonic sound energy through the pipe wall.
The transducers can be mounted in three different con-
figurations. The selection of the proper configuration is
dependent on the liquid to be measured characteristics.
The three liquid characteristics, which will affect mounting
location and orientation, are as follows:
CASE 1: Liquid that contains 25 to 10,000 PPM [1%] of
30 micron or larger suspended solids or aeration.
CASE 2: Liquid that contains greater than 10,000 PPM
[1%] of 30 micron or larger suspended solids or aeration.
CASE 3: Liquid that contains fewer than 25 PPM of 30
micron or larger suspended solids or aeration and sus-
pended solids and aeration content which is smaller than
30 microns.
Liquid that contains 25 to 10,000 PPM [1%] of 30 mi-
cron or larger suspended solids or aeration.
Select a transducer mounting location with adequate
straight runs of pipe, both upstream and downstream, to
achieve stable readings. Examples of minimum upstream
and downstream requirements are included in Table 1.
Mount the transducers 180°apart and facing each other
on the pipe. If the pipe is horizontal, the preferred mount-
ing orientation is 3 and 9 o’clock, with 12 o’clock being the
top of the pipe. Orientation on vertical pipes does not
matter. See Figure 4.
PART 2 - TRANSDUCER INSTALLATION
Transducer Mounting
Considerations
CASE 1:
Step A - Mounting
Locations

Rev. 03/98 -11- D901/M
Liquid
that
contains greater than 10,000 PPM [1%] of 30 micron or
PART 2 - TRANSDUCER INSTALLATION
Table 11
Figure 4
1The D901/M 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. 03/98 -12- D901/M
greater suspended solids or aeration.
The mounting location and straight pipe requirements for
CASE 2 liquid characteristics are the same as those de-
scribe in CASE 1. The difference will be in the location of
the transducers on the pipe. As the discontinuities
(suspended solids or aeration) reach a level of approxi-
mately 1% or 10,000 PPM, sound can no longer be relia-
bly transmitted through the liquid as it has a tendency to
scatter and absorb into the high concentration of disconti-
nuity. To compensate for this, the D901/M transducers
can be located on the same region of the pipe. In a hori-
zontal pipe, mount the transducers at 2 o’clock and 4
o’clock positions. (Assuming 12 o’clock as the top of the
pipe.) See Figure 5.
Liquid that contains fewer than 25 PPM of 30 micron
or larger suspended solids or aeration. Or, liquid that
contains solids or aeration which is smaller than 30
microns.
The transducers will be mounted 1 to 3 pipe diameters
downstream from a 90°elbow. The orientation of the
transducers on the pipe will be 180°apart and facing each
other and 90°out of the plane of the elbow. See Figure
6.
PART 2 - TRANSDUCER INSTALLATION
CASE 3:
Figure 5
CASE 2:

Rev. 03/98 -13- D901/M
PART 2 - TRANSDUCER INSTALLATION
Before the transducer heads are bonded to the pipe sur-
face, an area slightly larger than the flat surface of the
transducer must be cleaned to bare metal on the pipe.
(Plastic pipes do not require preparation beyond removal
of paint.) Remove all scale, rust and paint. Thoroughly
dry and degrease the mounting surfaces.
NOTE: Small pits in the piping surface typically do not
significantly impact ultrasonic transmission or signal re-
ception.
After selecting the applicable mounting location and pre-
paring the piping surface as detailed in A and B, the
transducer can be mounted to the pipe.
To assure an acoustically conductive path between the
transducer face and the prepared piping surface, a cou-
pling compound is employed. Enclosed with the D901/M
system is tube of Dow Corning RTV-732. This couplant
is satisfactory for permanently mounting the transducers
to the pipe. If the installation is temporary (less than a
few days), Dynasonics recommends utilizing a silicone-
based grease such as Dow Corning 111. The grease
chosen must be rated to not flow at the temperature of
the pipe.
STEP B -
PIPE SURFACE
PREPARATION
STEP C -
TRANSDUCER
MOUNTING
Figure 6

Rev. 03/98 -14- D901/M
PROCEDURE:
1. Select the proper number of transducer straps to allow
a complete strap to go around the circumference of
the pipe. See Table 2 - The straps can be connected
together to make a continuous length.
2. Wrap the strap around the pipe in the area where the
transducers are to be mounted. Leave the strap loose
enough to allow the transducers to be placed under-
neath. If multiple straps are being used, it can be
beneficial to wrap electrical tape around all but one
strap connection to secure the strap worm screws in
place.
3. Spread an even layer of coupling compound, approxi-
mately 1/8 inch [3mm] thick, to the prepared trans-
ducer mounting areas of the pipe. Utilize Dow 732 for
permanent mounting or Dow 111 for temporary mount-
ing,
4. Spread an even layer of coupling compound, approxi-
mately 1/8 inch [ 3mm ] thick, to the flat face of the
two transducers.
5. Place each transducer under the strap with the flat
face positioned towards the pipe. The notch on the
back of the transducer will provide a mounting surface
for the strap. The transducer cables must be facing in
PART 2 - TRANSDUCER INSTALLATION
Pipe Sizes Straps Required
1” to 9” 25 to 225 mm 1
10” to 19” 250 to 480 mm 2
20” to 29” 500 to 740 mm 3
30” to 39” 760 to 1000 mm 4
Table 2

Rev. 03/98 -15- D901/M
the same direction for proper operation. See Figure 7.
NOTE: Large pipes may require two people for this
procedure.
6. Tighten the strap tight enough to hold the transducers
in place, but not so tight that all of the couplant
squeezes out of the gap between the transducer face
and pipe. Ensure that the transducers are squarely
aligned on the pipe.
7. Route the transducer cable back to the transmitter
mounting area avoiding high voltage cable trays and
conduits. Do not attempt to add additional cable to the
factory supplied transducer cable. The D901/M proc-
esses very small signals, so the cable shield must be
continuous. Excess cable may be coiled to take up
extra length.
8. If the transducers are to be permanently mounted us-
ing Dow 732, the RTV must be completely cured be-
fore proceeding to Instrument Start up. Ensure that no
relative motion between the transducer and pipe oc-
curs during the 24 hour curing process. If Dow 111
grease was used for temporary operation of the D901/
M system, proceed with the Instrument Start-up pro-
cedures.
Transducer Installation is complete
The enclosure should be mounted in an area that is con-
venient for servicing, calibration or for observation of the
PART 2 - TRANSDUCER INSTALLATION
Figure 7

Rev. 03/98 -16- D901/M
LCD readout.
1. Locate the transmitter within the length of transducer
cable that was supplied with the D901/M system. If
this is not possible, do not attempt to add additional
cable to the transducer. Contact the Dynasonics fac-
tory to coordinate an exchange for the proper cable
length. Transducer cables that are up to 300 feet [90
meters] are available.
2. Mount the D901/M transmitter in a location that is:
PART 2 - TRANSMITTER INSTALLATION
Transmitter Installation
Figure 8

Rev. 03/98 -17- D901/M
♦Where little vibration exist.
♦Protected from falling corrosive fluids.
♦Within ambient temperature limits - 22 to 122°F [30 to
50°C]
♦Out of direct sunlight. A sun and weather shield is
available from Dynasonics. P.N. D003-899-001. Direct
sunlight may increase temperatures within the trans-
mitter to above maximum limit.
3. Mounting: Refer to Figure 8 for enclosure and mount-
ing dimension details. Ensure that enough room is
available to allow for door swing, maintenance and
conduit entrances. Secure the enclosure to a flat sur-
face with four appropriate fasteners.
4. Conduit holes. Conduit hubs should be used where
cables enter the enclosure. Holes not used for cable
entry should be sealed with plugs.
NOTE: Use NEMA 4 [ IP65 ] rated fittings plugs to main-
tain the water tight integrity of the enclosure. Generally,
the left conduit hole (viewed from front) is used for line
power; the right conduit hole for transducer connections.
5. If additional holes are required, (analog outputs, etc.)
drill the appropriate size hole in the enclosure’s bot-
tom. Use extreme care not to run the drill bit into the
wiring or circuits cards.
To access terminal strips for electronic connectors, loosen
the two screws in the enclosure door and open the door.
Loosen the two thumb-screws on the inner display door
and open the door.
1. Guide the transducer terminations through the trans-
mitter conduit hole located on the right side of the en-
closure. Secure the transducer cable with the supplied
PART 2 - TRANSMITTER INSTALLATION
ELECTRICAL
CONNECTIONS

Rev. 03/98 -18- D901/M
conduit nut.
2. The terminals on the transducer cable are coded with
wire markings. Connect the appropriate wires to the
corresponding screw terminals in the transmitter. See
Figure 9.
NOTE: The transducer cable carries low level signals.
Do not attempt to add additional cable to the factory sup-
plied transducer cable. If additional cable is required,
contact the Dynasonics factory to arrange for an ex-
change transducer with the appropriate length of cable.
Cables to 300 feet [ 90 meters ] are available.
The 4-20mA output is proportional to the flow rate meas-
uring scale and can drive a load of up to 600 ohms. The
output is isolated from earth ground and circuit low. Con-
nect the load to the 4-20 mA screw terminals on the trans-
mitter terminal block, matching polarity as indicated.
NOTE: An additional hole in the transmitter enclosure is
required for outputs. Drill the hole in the the enclosure bot-
tom taking care not to drive the drill bit into wiring or the
circuit boards with the transmitter.
The pulse output is proportional to the flow rate measuring
scale. This output may be used one of two ways:
♦To drive a 12V logic device.
♦To drive a low impedance, 12V device. Minimum re-
sistance 50 ohms.
The pulse output is adjustable from a range of 0 - 600 Hz
to 0 - 10kHz via control R29 [CTR] located on the left side
of the signal processing PCB in the back of the enclosure.
The pulse width is fixed at 50 µseconds. CTR “ - ” repre-
sents circuit low. CTR “ + “ represents 12 Vdc pulse out-
PART 2 - ELECTRICAL INSTALLATION
Figure 9
Pulse Output
4-20 mA Output
Transducer Connections

Rev. 03/98 -19- D901/M
put.
If the 0-1mA output has been installed on the D901/M,
the connections are available on the screw terminal block
in the transmitter. Connect a load of not more than 4 K
ohms to the terminals. Adjust control R20 [1 mA] to fine
tune the output to match the load impedance.
Connect line power to the screw terminals marked AC, AC
and GND in the transmitter. See Figure 10. Utilize the
conduit hole on the left side of the enclosure for this pur-
pose. Use wiring practices that conform to local codes
(National Electric Code Hand book in the USA). Use only
the standard three wire connection. The ground terminal
grounds the instrument, which is mandatory for safe op-
eration.
CAUTION: Any other wiring method may be unsafe or
cause improper operation of the instrument.
It is recommended not to run line power with other signal
wires within the same wiring tray or conduit.
NOTE: This instrument requires clean electrical line
power. Do not operate this unit on circuits with noisy com-
ponents (i.e. Fluorescent lights, relays, compressors, vari-
able frequency drives, etc.).
If this option is installed, the D901/M can be operated
from a 12 Vdc source, as long as it is capable of supplying
1 Ampere. Observe proper polarity.
PART 2 - ELECTRICAL INSTALLATION
Optional 12 Vdc power
Figure 10
Line Power
Optional 0 - 1 mA
Output