Greyline Instruments DFS-5.1 Operating Manual
www.greyline.com
USER'S GUIDE
Installation & Operation
Instructions
Doppler Flow Switch
Model DFS 5.1
Manual Series 1.3
Note: This page has been left blank intentionally.
DFS 5.1 Doppler Flow Switch
INDEX
INTRODUCTION ................................................................................................... 4
CONNECTIONS ..................................................................................................... 5
ADJUSTMENTS ..................................................................................................... 5
TRANSDUCER INSTALLATION ......................................................................... 8
ENCLOSURE INSTALLATION .......................................................................... 11
PRINCIPLE OF OPERATION ............................................................................. 11
APPLICATIONS BACKGROUND ...................................................................... 13
TYPICAL DFS 5.1 CONTROL APPLICATIONS ............................................... 14
APPLICATIONS HOTLINE ................................................................................. 15
PRODUCT RETURN PROCEDURE ................................................................... 15
SPECIFICATIONS ................................................................................................ 17
APPENDIX A - OPTIONS ................................................................................... 18
APPENDIX B ........................................................................................................ 20
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 3
DFS 5.1 Doppler Flow Switch
INTRODUCTION
DOPPLER FLOW SWITCH - Model DFS 5.1
The Greyline Doppler flow switch consists of an encapsulated ceramic transducer, a transmitter/receiver
unit, electronic circuitry to separate the Doppler frequency from the transmitted frequency and an
adjustable set-point relay. The relay also has hysterisis and delay-off capability.
The DFS 5.1 Flow Switch is housed in a watertight NEMA4X fiberglass enclosure and requires a
115VAC power supply.
Flow measurement range is 0.25 to 10 ft/second (0.076 to 3 m/sec).
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CONNECTIONS:
DFS 5.1 Doppler Flow Switch
SENSOR: Connect one sensor
coaxial cable to the Rx and GND
terminal block, and the second sensor
coaxial cable to the Tx and GND
terminal block. Tx and Rx are the
solid core of each coaxial cable, and
GND is the stranded shield of each
coaxial cable. (See page 17 for coaxial
cable preparation).
POWER INPUT: Connect 115VAC
50/60Hz to the LINE, NEUTRAL and
GROUND terminals. Do not apply
power until sensor connections have
been made.
Note
Tx = Transmitter
Rx = Receiver
Nc = Normally closed contacts
No = Normally open contacts
C = Common
SENSOR
GND
Tx Rx
G
G
SENSOR
AC
POWER
INPUT
G
NL
Nc
RELAY
Nc
C
No
C
No
ADJUSTMENTS:
Bar Graph
Display
The green LED’s indicate flow velocity. The red
LED indicates relay energized see chart for
calibration.
Relay Trip Point Insert shorting link at the flow rate indicated by
the bar graph display. A second link can be
inserted to provide a relay deadband.
Alarm State Select high flow alarm or low flow alarm by
inserting the shorting link.
Relay Drop-out
Delay
Adjust delay in 5 second increments to prevent
relay chatter on intermittent flow.
RELAY ENERGIZED
SHORTING LINK
FLOW
HYSTERISIS (OPTIONAL)
SET-POINT (SELECT)
LO-FLOW ALARM
HIGH FLOW ALARM
RELAY DROP-OUT DELAY
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DFS 5.1 DOPPLER FLOW SWITCH CALIBRATION
16
DFS 5.1 Doppler Flow Switch
mm/s VELOCITY
3000
LED
15
14
SCH40 2" Pipe
13
12
11
10
9
8
7
6
5
4
3
2
1
0 6.31 12.62 18.93 25.24 31.55 37.85
SCH40 3" Pipe
SCH40 4" Pipe
SCH40 6" Pipe
SCH40 8" Pipe
SCH40 10" Pipe
SCH40 12" Pipe
L/s
2700
2400
2100
1800
1500
1200
1050
900
750
600
450
300
225
150
75
0
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DFS 5.1 Doppler Flow Switch
DFS 5.1 DOPPLER FLOW SWITCH CALIBRATION
16
Ft/s VELOCITY
10.0
LED
15
14
SCH40 2" Pipe
13
12
11
10
9
8
7
6
5
4
3
2
1
0 100 200 300 400 500 600
SCH40 3" Pipe
SCH40 4" Pipe
SCH40 6" Pipe
SCH40 8" Pipe
SCH40 10" Pipe
SCH40 12" Pipe
USGPM
9.0
8.0
7.0
6.0
5.0
4.0
3.5
3.0
2.5
2.0
1.5
1.0
0.75
0.5
0.25
0
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