Greyline Instruments A.1.1 Series User manual

www.greyline.com
USER'S GUIDE
Installation & Operation
Instructions
Doppler Flow Meter
Model DFM 5.1
Manual Series A.1.1

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DFM 5.1 Doppler Flow Meter
INDEX
CONNECTIONS ..................................................................................................... 4
KEYPAD SYSTEM ................................................................................................ 6
CALIBRATION MENU ......................................................................................... 7
ICONS ..................................................................................................................... 8
MESSAGE ICON .................................................................................................... 9
STATUS .................................................................................................................. 9
PASSWORD.......................................................................................................... 10
UNITS/MODE ....................................................................................................... 11
CALIBRATION .................................................................................................... 12
RELAY PARAMETERS....................................................................................... 13
SPECIAL FUNCTIONS ........................................................................................ 14
SENSOR MOUNTING ......................................................................................... 16
ENCLOSURE INSTALLATION .......................................................................... 20
FIELD TROUBLESHOOTING ............................................................................ 22
COMMON QUESTIONS AND ANSWERS ........................................................ 25
APPLICATIONS HOTLINE................................................................................. 27
PRODUCT RETURN PROCEDURE ................................................................... 27
FLOW METER DATA SHEET ............................................................................ 28
APPENDIX A – OPTIONS ................................................................................... 30
DATA LOGGING ................................................................................................. 36
SPECIFICATIONS................................................................................................ 38
PIPE CHARTS ...................................................................................................... 40
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.
If this product is not used as specified by the manufacturer, protection may be impaired.
Available in Adobe Acrobat pdf format

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DFM 5.1 Doppler Flow Meter
CONNECTIONS:
POWER INPUT: The standard model requires AC power input between 100 to 240 VAC 50/60Hz. No
adjustments are necessary for voltages within this range. Connect L (Live) N (Neutral) and AC Ground.
Optional DC input model requires 9-32 VDC/9 Watts. Connect to + and - terminals.
Optional Thermostat and Heater modules are available rated for 115 VAC or 230 VAC.
IMPORTANT NOTE: To comply with CSA/UL electrical safety standards, AC power input and relay
connection wires must have conduit entry to the instrument enclosure. Installation requires a switch,
overcurrent fuse or circuit breaker in the building (in close proximity to the equipment) that is marked
as the disconnect switch.
Risk of electric shock. Loosen cover screw to access connections. Only qualified personnel
should access connections.
Note: Use of instrumentation over 40°C ambient requires special field wiring.
Note: User replaceable fuse is 2 Amp 250V (T2AL250V).

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DFM 5.1 Doppler Flow Meter
CONNECTIONS

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DFM 5.1 Doppler Flow Meter
KEYPAD SYSTEM
The following diagram shows the DFM 5.1 menu system. Arrows show the four directions to leave a
menu box. Pressing a corresponding keypad arrow will move to the next item in the direction shown.
Move the cursor (highlighted) under numerals and increase or decrease numerals with the  and 
keys.
To store calibration values permanently (even through power interruptions), press the .

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DFM 5.1 Doppler Flow Meter
CALIBRATION MENU

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DFM 5.1 Doppler Flow Meter
ICONS

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DFM 5.1 Doppler Flow Meter
MAIN DISPLAY
The main display shows the units selected from the Units/Mode menu, Flow or
Velocity rate being measured, TOTALIZER and RELAY states. The DFM 5.1
will start-up with this display.
MESSAGE ICON
Press  from the main display to view status of the data logger and error/warning
messages provided by the instrument. The Message Icon will appear on the main
display if error messages are being generated by the instrument. Press  to return
to the main display.
STATUS
Press  from the main display to view instrument status. Velocity will be
displayed in ft/sec or m/sec.
Tot Displays the current totalizer reading.
Signal Cutoff
Adjust the setting in percent to suppress flow
readings at zero flow when fluid swirling or pipe
vibration may cause the instrument to continue
reading. Example: Signal Cutoff at 5% will force the
display and outputs to zero when signal strength
drops below 5%.
Signal Strength
Displays percentage of signal being received by the
ultrasonic sensor.
Relays
Energized relays will display as a white character on
a black background.
20mA at
Displays the flow rate set as 20mA in the Calibration
menu. Press  to return to the main display.

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DFM 5.1 Doppler Flow Meter
24 HR LOG (Data Logging option only)
Press  from the main display to view a formatted flow report from instruments
with a built-in data logger. Press  to scroll down one day or repeatedly to scroll
to a specific date. Up to 365 days can be stored. Newest date will overwrite the
oldest. Press  to return to the main display.
PASSWORD
The password (a number from 0000 to 9999) prevents unauthorized access to the
Calibration menu.
From the main display press the  key to get to Password. Factory default
password is 0000 and if it has not been changed press the  to proceed to the
Menu Selections screen.
If a password is required, press  to place the cursor under the first digit and  or
 to set the number, then  to the second digit, etc. Press  or  to proceed to
the Menu Selections screen.
A new password can be stored by going to Special Functions/New Password.

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DFM 5.1 Doppler Flow Meter
UNITS/MODE
From Mode press the  and then the  or  to select Flow or Velocity.
Flow mode displays the flow rate in engineering units (e.g. gpm, litres/sec, etc.)
Press the  to store your selection then the  to the next menu item and  to
enter.
From Linear press the  key and then the  or  to select your units of
measurement. Press the  to store your selection.
Press the  key to move the  symbol to each subsequent menu item and the  to
save your selections.
Note: the volume selection "bbl" denotes U.S. oil barrel.
Press  or  to return to the Menu Selections screen.

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DFM 5.1 Doppler Flow Meter
CALIBRATION
Press the  to Calibration and  to enter. Use  or  to position  before
each menu item and  to enter. When settings are completed press  to store and
return to the Calibration menu.
20mA at
(5V Flo)
Press

then

or

to change the numbers and decimal point.
Use this menu to set the corresponding flow rate that will be
represented by 20mA analog output. If maximum flow is
unknown, enter an estimated flow rate and observe actual flow
to determine the correct maximum value. Any velocity or flow
rate up to +40 ft/sec (12.2 m/sec) may be selected.
4mA at
(0V Flo)
Press

or

to set the flow rate corresponding to 4mA analog
output. This setting may be left at zero flow (or velocity or can
be raised to any value less than the 20mA setting, or lowered to
any velocity or corresponding flow rate down to -40 ft/sec
(-12.2 m/sec).
Min Vel Press

and enter a minimum velocity cutoff. Forward and
reverse velocities less than Min Vel will be forced to zero.
Pipe ID
Place the cursor under the digits and then

or

to change the
numbers and decimal point. Pipe ID should be entered as the
exact inside diameter of the pipe where the sensor is mounted.
Refer to the Pipe Charts Appendix in this manual for inside
diameter of common pipe types and sizes.
Damping
Increase damping to stabilize readings under turbulent flow
conditions. Decrease for fast response to small changes in flow.
Damping is shown in percentage (maximum is 99%). Factory
default is 10%.
Press  to return to Menu Selections screen.

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DFM 5.1 Doppler Flow Meter
RELAY PARAMETERS
Relay Press

and

or

to select a corresponding relay number (2
relays are standard, 4 additional are optional).
Function Press

or

to select Off, Pulse or Flow.
Flow Mode Select Pump, Low Alarm or Hi Alarm.
Pump mode provides separate On/Off settings where the
relay will energize at one flow rate and de-energize at another.
On Position the cursor under the numerals and press  or 
to set digits to the required relay On set point.
Off set digits to the required Off set point.
Low Alarm mode relay will energize at a programmable flow
rate and remain energized with flow below the set point. When
flow rises above the set point, the relay will de-energize.
Hi Alarm mode relay will energize at a programmable flow
rate and remain energized with flow above the set point. When
flow falls below the set point, the relay will de-energize.
Pulse Press

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
2.25 seconds and pulse duration is 350 milliseconds.
Return to Relay and change settings for each relay number.
Press  to return to Menu Selections.

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DFM 5.1 Doppler Flow Meter
DATA LOGGING (OPTIONAL)
Refer to Options section of this manual.
SPECIAL FUNCTIONS
Language
Select English, French or Spanish
Analog Out
Select 4-20mA or 0-5V mode for the analog
output.
Backlight
Select High, Medium or Low for continuous
backlight.
Select Key Hi/Lo for high backlight for 1 minute
after a keypress and then Lo backlight until a key is
pressed again.
Select Key High, Med or Low for backlight
for 1 minute after a keypress and then backlight off
until a key is pressed again.
Reset Totalizer
Press

and select Yes to erase and restart the
totalizer at zero.
Negative Totals
Select Yes to have reverse flow readings
deducted from the totalizer. Select No to totalize
forward flow only and ignore reverse flow.
Flo Direction
Select On to enable flow direction measurement.
Select Off to disable flow direction
measurement. Select Invert to invert the sense of
the flow measurement.
Cal Constant
Scales the velocity reading. Factory value is close
to 1.000 for a SE4-A sensor.
Restore Defaults
Select Yes and press  to erase all user settings
and return the instrument to factory default
settings.
New Password
Select any number from 0000 to 9999 and press .
Default setting of 0000 will allow direct access to
the calibration menus. Setting of any password
greater than 0000 will require the password to be
entered to access the calibration menus.
Press  to return to Menu Selections.

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DFM 5.1 Doppler Flow Meter
SIMULATION
Exercises the 4-20mA (0-5V) output, digital display and control relays.
Test Select Maximum and press  to simulate maximum Flow or Velocity and
to output 20mA (5V) to the analog channel.
Select Minimum and press  to simulate minimum Flow or Velocity and
to output 4mA (0V) to the analog channel.
To simulate measurements between minimum and maximum set Test to
Actual and then enter for the flow measurement. The analog output and
control relays will respond to the simulated value.

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DFM 5.1 Doppler Flow Meter
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.
VERTICAL OR HORIZONTAL PIPE - Vertical pipe
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 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 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,
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
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.

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DFM 5.1 Doppler Flow Meter
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 PC4 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.

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DFM 5.1 Doppler Flow Meter
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
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).
Use the PC4 pipe clamp (supplied) as illustrated above or
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
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 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 5.1 (and available from Greyline Instruments) is recommended for semi-permanent installations.

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DFM 5.1 Doppler Flow Meter
SENSOR MOUNTING/COUPLING RECOMMENDATIONS

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DFM 5.1 Doppler Flow Meter
ENCLOSURE INSTALLATION
Locate the enclosure within 20 ft (6 m) of the sensor (500 ft -150 m optional). The enclosure can be wall
mounted with the four mounting screws (included) or panel mounted with Option PM Panel Mount kit
from Greyline Instruments.
Avoid mounting the enclosure in direct sunlight to protect the electronics from damage due to
overheating and condensate. In high humidity atmospheres, or where temperatures fall below freezing,
Option TH Enclosure Heater and Thermostat is recommended. Seal conduit entries to prevent moisture
from entering enclosure.
NEMA4X (IP66) WITH CLEAR COVER
1. Open hinged enclosure cover.
2. Insert #12 screws (supplied) through the four enclosure mounting holes
to secure the enclosure to the wall or mounting stand.
Additional conduit holes can be cut in the bottom of the enclosure when
required. Use a hole saw or Greenlee-type hole cutter to cut the required
holes.
DO NOT make conduit/wiring entries into the top of the enclosure.
Note: This non-metallic enclosure does not automatically provide grounding between conduit
connections. Grounding must be provided as part of the installation. Ground in accordance with the
requirements of the National Electrical Code. System grounding is provided by connecting grounding
wires from all conduit entries to the steel mounting plate or another point which provides continuity.
CLEANING
Cleaning is not required as a part of normal maintenance.