Greyline Instruments DFM-IV User Manual
USER’S GUIDE
Installation & Operation
Instructions
Doppler Flow Meter
Model DFM-IV
Manual Series A.6
DFM-IV Doppler Flow Meter
Manual Series A.6
INDEX
Bench Test ·······················································3
Connections·······················································3
Keypad System ····················································4
Calibration Menu ··················································5
Totalizer ·························································6
Signal Strength ····················································6
Relay Status Display················································7
Password ·························································7
Units /Mode ······················································7
Calibration ·······················································8
4-20mA Current Loop···············································8
Damping ·························································8
Relay Parameters ··················································9
Special Functions ·················································10
Reset Totalizer ···················································10
Sensor Mounting··················································11
Enclosure Installation ··············································15
Synchronization ··················································16
Backflow Rejection················································17
Error/Warning Messages ···········································17
Fuse Replacement ·················································18
Troubleshooting ··················································19
Common Questions and Answers·····································22
Applications Hotline ···············································24
Product Return Procedure ···········································24
Flow Meter Data Sheet ·············································25
Warranty ·······················································26
AppendixA–Options ·············································27
Data Logger ·····················································32
RS232C Serial Output ·············································37
Specifications ····················································39
Appendix B - Conversion Table ······································40
Pipe Charts ······················································41
Calibration Record ················································44
IMPORTANT NOTE: This instrument is manufactured and calibrated to meet product specifications.
Please read this manual carefully before installation and operation. Any unauthorized repairs or
modifications may result in a suspension of the warranty.
Available in Adobe Acrobat pdf format
Page 2
DFM-IV Doppler Flow Meter
Manual Series A.6
QUICK BENCH TEST:
Connect Sensor as shown below, then Power. Test operation of the DFM-IV by holding the sensor in
one hand and rubbing your thumb or fingers briskly across the face (plastic surface) of the sensor.
Allow 15 seconds for the DFM-IV to process the signal and display a flow value.
CONNECTIONS:
POWER INPUT: The standard 115VAC model requires AC power input between 100 to 130 VAC
50/60Hz (2 amp fuse is recommended). No adjustments are necessary for voltages within this range.
Optional 230VAC requires power input between 200 to 260 VAC 50/60Hz. (See OPTIONS section of
this manual for connection of optional 12VDC or 24VDC power input).
IMPORTANT NOTE: To comply with CSA/NRTL electrical safety standards, AC power input and
relay connection wires must have conduit entry to the instrument enclosure.
TMTR
SYNC
C
N.O
RELAY 1
100-130VAC (50/60 Hz)
OPTIONAL:
200-260VAC (50/60 Hz)
N.C
N.O
RELAY 2
C
C
N.O
N.C
N.C
RELAY 3
G
N
L
IMPORTANT:
MUST CONNECT TO A
GOOD GROUND (<1 Ohm)
WITH 12 AWG CONDUCTOR
AC
4-20
*
RX
GND
PU
RS 232
TX
N.O
RELAY 4
OPTIONAL
RCVR
C
N.C
N.O
RELAY 5
C
*
A
N.C
GROUND STUD
IMPORTANT
ATTACH CABLE
SHIELDS (SENSOR,
4-20mA, RS232)
THIS END ONLY
B
INPUT
VOLTAGE FREE
DRY CONTACTS
(BY CUSTOMER)
:
ALUMINUM CHASSIS
Page 3
KEYPAD SYSTEM
The DFM-IV has a simple 3-button calibration
system. Operating and calibration modes are shown
on the 16-digit alphanumeric display. The keypad is
used to move around the menu to calibrate the
DFM-IV, and to view operating mode and functions.
A beep is sounded as each key is pressed. If the
keypad is not used for 10 minutes, the DFM-IV will
automatically go to
RUN mode. Use the keypad to
explore the Menu and become familiar with its
features.
MENU - FLOW CHART
DFM-IV Doppler Flow Meter
Manual Series A.6
The following diagram shows the DFM-IV Menu system. Arrows show the three directions to leave a
box. Pressing a corresponding keypad arrow will move to the next box in the direction shown. Move the
cursor (or underline) under numerals and increase or decrease numerals with the È and Ç keys.
At the bottom of each Menu column is a
(even through power failure), move the cursor under
pressed with the cursor under
Store? no changes will be stored and the system will return to the top of
Store? Yes box. To store the calibration values permanently
Yes and press the È or Ç key. If the È key is
the Menu column.
Page 4
DFM-IV Doppler Flow Meter
Manual Series A.6
Calibration Menu
DFM-IV ver 2.67
SPECIAL FUNCTION
TAG 09
Date Jan 01/2000
Time 11:50:57
Defaults? Yes
Reset Tot? Yes
Simul 0.00 %
20mA ADJ 20.000
4mA ADJ 4.000
Master Slave
New Password: 00
Com 24 48 9 1926
*** STORING ***
Store? Yes
OPTIONAL FEATURES
RELAY PARAMETERS
CALIBRATION
Flow
Pulse
R1 Function Off
Pipe ID 1.000 ft
ft3/s
OFF
R1on 100.0 ft3/s
R1 0.00
R1on 100 ft3
R2
4mA @ 0.00 %
MaxF 10.00 ft3/s
20mA @ 100.0 %
R3
Damping 10 %
R4
Store? Yes
R5
*** STORING ***
*** STORING ***
Store? Yes
HiAlm LoAlm
At: 5.0 ft3/s
Time Event
Log Site ID 1
DATA LOGGING
RUN STOP Setup
Formatted Trend
StartJan 01/2000
Start 03:02:16
Interval: 30 Sec
Interval: 10 Sec
Interval: 5 Sec
Interval: 2 Sec
Interval: 1 Sec
Interval: 30 Min
Interval: 10 Min
Interval: 5 Min
Interval: 2 Min
Interval: 1 Min
*** STORING ***
Reset Log? Yes
WrapAround? Yes
26640 Hrs Left
Store? Yes
UNITS / MODE
PASSWORD: 00
RUN
Flow Velocity
Tot: 1098 ft3
ftinmcm
v
SS
IMG m3 L brl
Ft3 USG USMG IG>
s min Hr d
Relays: 1 2 3
*** STORING ***
Store? Yes
Session No 1
24 HR LOG
ONLY IF ENABLED
SHOWS 24 Hr FORMAT
Jan 01/2000 ->
Daily AVERAGE
Daily TOTAL
StartJan 01/2000
Daily MAX Flow
MAX Flow TIME
Start 03:02:16
Daily MIN Flow
MIN Flow TIME
Isnterval: 24 Hr
Interval: 12 Hrs
Interval: 8 Hrs
Interval: 4 Hrs
Isnterval: 1 Hr
Dec 31/1999 ->
255 Days
- no more data -
Page 5
RUN
A scrolling display shows the units selected from the units selection
column, the mode of operation (VELOCITY or FLOW), the full
scale value for the large numeric display and the TOTALIZER value.
DFM-IV Doppler Flow Meter
Manual Series A.6
RUN PASSWORD
Tot: 1098 ft3
SS
v
TOTALIZER
From
RUN use È key to display the totalizer value. The Totalizer
Relays: 1 2 3
value is updated every 2 seconds with flow volume > 1 litre (0.264 USG). The Totalizer display will
show up to 10 digits and then overflows to 0 automatically.
Units: ft³, USG, IG, L
Units = m³
Press Ç key to return to
RUN.
The Totalizer can be reset by going Æ to
T: 9999999999
T: 0283168470
TOT: 0
TOT: 0
SPECIAL FUNCTIONS and È to Reset Tot?.
SIGNAL STRENGTH
From
TOTALIZER use È key to get to SS (Signal Strength /
Sensitivity).
Press Æ to position the cursor under the numeral. Use Ç or È to
increase or decrease signal strength. Minimum setting is '1'
Maximum setting is '9'.
Signal strength should be adjusted so that the 'Signal Strength
Arrow' meets the 'Ideal Marker' under normal flow conditions.
Signal strength must pass the 'Minimum Marker' for the flow
meter to display flow.
It is normal for Signal Strength to fluctuate and rise to full scale
under high flow conditions.
Page 6
SS
Current
Signal Strength
Arrow
SS 5
SS
SS
SS
Minimum
Marker
v
v
v
Ideal
Marker
DFM-IV Doppler Flow Meter
Manual Series A.6
Relays123(Relay Status Display)
Displays state of each Relay. 1 2345- Reverse character indicates that the Relay is On (energized).
24 HR LOG
DFM-IV Flow Meters with optional Data Logger will display this menu. Refer to OPTIONS section.
PASSWORD
The password (a number from
00 to 99) prevents unauthorized access to the
CALIBRATION menu.
From
RUN press Æ to get to PASSWORD.
Press Æ to place the cursor under the digit and È or Ç to enter your password.
Factory default Password is
A new password can be stored by going to
New Password.
to
00.
SPECIAL FUNCTIONS and È
UNITS /MODE
PASSWORD
UNITS / MODE
Flow Velocity
ftinmcm
Ft3 USG USMG IG>
IMG m3 L brl
s min Hr d
CALIBRATION
PASSWORD: 00
PASSWORD: 00
PASSWORD: 01
Use Æ to get to
UNITS / MODE, then È to get to Linear Units. Use Æ to move the cursor under the
required units.
Use È to get to Volume Units and then select units of Time and
Flow mode displays flow rate in engineering units (e.g. gpm, litres/sec etc.)
Velocity mode displays flow velocity in units/time (e.g. ft/sec or m/sec)
When all units have been selected go to
Store? Y es
*** STORING ***
Flow or Velocity.
Store? then Æ to Yes and È or Ç to CALIBRATION.
Page 7
CALIBRATION
DFM-IV Doppler Flow Meter
Manual Series A.6
UNITS / MODE
CALIBRATION press È to Pipe ID and Æ to place the cursor under the digits and È or Ç to
From
CALIBRATION
Pipe ID 1.000 ft
MaxF 10.00 ft3/s
4mA @ 0.00 %
20mA @ 100.0 %
Damping 10 %
Store? Yes
*** STORING ***
RELAY PARAMETERS
change the numbers and decimal point. Pipe ID should be entered as the exact inside diameter of the
pipe where the sensor is mounted.
Press Æ to return the cursor to
Pipe ID and È to MaxF. Set digits to the maximum flow rate in your
application. If maximum flow is unknown, enter an estimated maximum and observe actual flow to
determine the correct maximum value. (
flow rate and maximum flow in the optional data logger.
MaxF entry is required only to set 20mA output at a specific
MaxF setting has no effect on the DFM-IV
digital display, totalizer, or control relays).
4-20mA CURRENT LOOP
Some applications may require the 4-20mA output to be offset so that 4mA or 20mA correspond to flow
rates other than Zero and Maximum.
4mA at
use È or Ç to set % output for 4mA. It is adjustable from -5% (3.8mA) up to
15% lower than the 20mA setting. Adjustment resolution is 0.05% (0.01mA).
20mA at
use È or Ç to set % output for 20mA (down to 15% greater than the 4mA
setting and up to 300%). Adjustment resolution is 0.05% (0.01mA).
DAMPING
Increase damping to stabilize readings under turbulent flow conditions. Damping time shown in
percentage is the interval for a zero to full scale display change (maximum 99 percent). Factory default
is 20 percent.
Page 8
RELAY PARAMETERS
DFM-IV Doppler Flow Meter
Manual Series A.6
CALIBRATION
RELAY PARAMETERS RELAY PARAMETERS
R1on 100 ft3
R2
R3
R4
R5
Store? Ye s
*** STORING ***
Set Relays 1-3 (4-5 optional) to Off , Pulse or Flow.
P
ulse
press È and set digits to the flow volume increment required between relay
pulses. Use this feature for remote samplers, chlorinators or totalizers.
Minimum time between pulses is 1 second and pulse duration is 350
milliseconds.
Pulse
R1on 100.0 ft3/s
R1 0.00OFF ft3/s
FlowR1 Function Off
Flow
press È and set digits to the required On and Off set points. Use this feature for
flow control and alarms.
Page 9
SPECIAL FUNCTIONS
DFM-IV Doppler Flow Meter
Manual Series A.6
SPECIAL FUNCTION
DFM-IV ver 2.67
TAG 09
Date Jan 01/2000
Time 11:50:57
Reset Tot? Yes
Defaults? Yes
Simul 0.00 %
4mA ADJ 4.000
20mA ADJ 20.000
Master Slave
New Password: 00
Com 24 48 9 1926
Store? Yes
*** STORING ***
DFM-IV ver
shows software version installed
Tag enter instrument Tag Number (0-9999)
Date
Time
(with Optional Data Logger) use the È or Ç keys to change date as required
(with Optional Data Logger) use the È or Ç keys to change time as required
Reset Tot? Yes Select Yes to reset totalizer
Defaults? Yes
Press Æ 3 times to select Yes. Store to erase all user settings and return
instrument to factory default settings.
Simul 0.00% exercises 4-20mA output, digital display and control relays. Simplifies
calibration of remote devices on the 4-20mA loop and checks set
4mA ADJ
20mA ADJ
point/operation of Relays calibrated in Flow mode. Go È for
Use to fine tune the 4mA and 20mA calibration of the 4-20mA output.
Adjustment range is +1mA to –1mA in 0.002mA steps
100%.
Important: The 4-20mA output will be forced to 4mA and 20mA respectively
during these adjustments.
Master or Slave Master or Slave selection for synchronization of multiple DFM-IV flow meters
(see Manual section SYNCHRONIZATION).
New Password position cursor under digits and set new number between 00 and 99
Com 24 48 96 192
(Optional) set the baud rate of the DFM-IV RS232 output when equipped with
an optional data logger.
Page 10
DFM-IV Doppler Flow Meter
Manual Series A.6
SENSOR MOUNTING LOCATION
The position of the sensor is one of the most important considerations for accurate Doppler flow
measurement. The same location guidelines apply to Doppler as most other types of flow meters.
Before permanently mounting a Doppler sensor onsite testing is recommended to determine optimum
mounting position. Use the sensor coupling compound (supplied with each Greyline flow meter, or
petroleum gel, acoustic compound or electrocardiograph gel). Take several readings around the axis of
the pipe and then at several points upstream and downstream from the selected position, checking for
consistent readings. Avoid high or low reading areas. Mount the sensor where consistent (average)
readings were obtained or continue testing on another pipe section.
12 O' CLOCK P OS IT I ON W IT H
VERTICAL OR HORIZONTAL PIPE - Vertical pipe
LOW GAS CONTENT
runs generally provide evenly distributed flow. On
Horizontal pipes and liquids with high concentrations
of gas or solids, the sensor should be mounted on the
side (3 or 9 o’clock position) to avoid concentrations
3O'CLOCK POSITION WITH HIGH
GAS OR S OL I DS CONT E NT
of gas at the top of the pipe, or solids at the bottom.
For liquids with minimal gas bubbles (e.g. potable
water) the sensor should be mounted on the top of a
HAS E VE NLY DIS T R IB UT E D FL OW
VERTICAL PIPE US UALLY
horizontal pipe (12 o’clock position) to obtain the best
signal strength.
VELOCITY INCREASING DEVICES: Generally the sensor must be mounted away from flow
disturbances such as valves, pumps, orifice plates, venturis or pipe inlets and discharges which tend to
increase flow velocity. Velocity increasing devices often cause cavitation, or rapid release of gas
bubbles, and readings both up and downstream may show much higher velocity. As a guideline, mount
the sensor at least 20 diameters upstream or 30 diameters downstream from velocity increasing devices.
Required distance from a velocity increasing device will vary in applications depending on the flow
velocity and the characteristics of the liquid itself.
TURBULENCE INCREASING DEVICES: Elbows,
S E NS OR MOU NT S 6 D I AME T E R S
UPSTREAM OR 10 DOWNSTREAM
FROM AN E LBOW
flanged connections and tees tend to introduce
desirable conditions of an evenly distributed flow
profile with some air or gases entrained in the flow.
Sensor mounting 6 pipe diameters upstream and 10
FLOW
diameters downstream from these disturbances is
generally optimum.
The sensor is designed to mount longitudinally on a straight section of pipe. Do not attempt to mount it
on bends, elbows or fittings.
Page 11
DFM-IV Doppler Flow Meter
Manual Series A.6
SENSOR MOUNTING
Prepare an area 2" wide by 4" long (50mm x 100mm) for sensor bonding by removing loose paint, scale
and rust. The objective of site preparation is to eliminate any discontinuity between the sensor and the
pipe wall, which would prevent acoustical coupling.
A PC3 Sensor Mounting Kit is supplied with each Greyline flow meter. It includes recommended
coupling compound in a plastic applicator and a stainless steel mounting bracket with adjustable pipe
straps.
SENSOR
PIPE
END VIEW
PIPE
Mount the PC3 pipe clamp as illustrated on pipes
0.6" / 15 mm OD or larger. Stainless steel bands are
included for mounting on pipes up to 32" / 81 cm OD.
Additional stainless steel bands (by customer) may be
combined to mount on pipes up to 180" / 4.5 m OD.
SENSOR
ADJUSTABLE
STAINLESS
STEEL STRAP
PIPE
PIPE
Page 12
SENSOR COUPLING
For permanent or temporary bonding, the following are recommended:
a) Dow Corning silicon compound #4 (supplied)
Additional supply: order Greyline Option CC
b) High Temperature compound (supplied with Sensor Option SE3H)
Additional supply: order Greyline Option AP-1W
c) Water-based sonic compound: Order Greyline Option CC30
d) Electrocardiograph gel
e) Petroleum gel (Vaseline)
The above are arranged in their order of preferred application.
d & e are only good for temporary bonding at room temperature.
DO NOT USE: Silicon RTV caulking compound (silicon rubber).
DFM-IV Doppler Flow Meter
Manual Series A.6
Use the PC3 pipe clamp (supplied) as illustrated above or
COMPOUND
use a loop of electrical tape for temporary mounting.
Apply silicon coupling compound #4 to the coloured
face of the sensor. A bead, similar to toothpaste on a
toothbrush, is ideal. Do not overtighten (crush the
SENSOR
The sensor must be fixed securely to the pipe with coupling material
between the sensor face and the pipe. Sensor installation with
sensor).
COMPOUND
excessive coupling compound can result in gaps or voids in the
coupling and cause errors or loss of signal. Insufficient coupling
compound will create similar conditions.
Over time temporary coupling compounds (e.g. Petroleum Gel) may
gradually sag away from the sensor resulting in reduced signal
TAPE OR
CLAMP
SENSOR
PIPE
strength and finally complete loss of signal. Warm temperatures,
moisture and vibration will accelerate this process. Dow Corning Silicone Compound #4 as supplied
with the DFM-IV (and available from Greyline Instruments) is recommended for semi-permanent
installations.
Page 13
DFM-IV Doppler Flow Meter
OO
SENSOR MOUNTING/COUPLING RECOMMENDATIONS
Manual Series A.6
BAD
G
D
Page 14
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