Dwyer | Series TDFS | Instruction manual | Dwyer Series TDFS Instruction Manual

Dwyer Series TDFS Instruction Manual
Bulletin F-TDFS
Series TDFS Thermal Dispersion Flow Switch
By Dwyer
Specifications - Installation and Operating Instructions
CABLE
CABLE GLAND
STATUS
INDICATOR
4-9/32
[108.74]
SETPOINT
TARGET
1-7/16
[36.51]
PROCESS CONNECTION
1/2˝ NPT
SENSOR
1-1/8
HEX
The Series TDFS Thermal Dispersion Flow Switch is a thermal flow switch that
indicates whether the flow rate is above or below a user set flow rate. The unit
incorporates two LED status indicators providing visual switch indication. The set flow
rate (setpoint) is field adjustable and the unit has both NO and NC NPN outputs. See
Figure 1 for output and LED actions on change of flow.
NC = Open, NO = Closed, LED = Green
Higher
Flow
Setpoint
Deadband
NC = Closed, NO = Open, LED = Red
Figure 1: Switch Setpoint and Deadband
OPERATING PRINCIPLE
The TDFS uses an impulse thermal dispersion measurement technique to measure
the flow rate. The probe is heated above the process temperature and then is allowed
to cool. The flow rate is determined from the rate at which the probe cools. The
measurement cycle time is approximately 8 seconds.
INSTALLATION
CAUTION
SPECIFICATIONS
Service: Compatible water-based fluids.
Wetted Materials: 316 SS, Polysulfone, and FKM.
Setpoint Range: 0.5 to 10 ft/s (0.15 to 3.0 m/s).
Repeatability: 0.07 ft/s +3% of setpoint.
Typical Deadband: 0.1 ft/s +15% of setpoint.
Temperature Limits: Process: 5 to 185°F (-15 to 85°C) (non-freezing); Ambient: 5
to 167°F (-15 to 75°C), Storage: -40 to 185°F (-40 to 85°C).
Pressure Limits: 300 psig (20.67 bar).
Response Time: Approximately 8 s.
Power Requirement: 9 to 24 VDC.
Switching Current: 400 mA, derate 5 mA/°C above 23°C.
Current Consumption: Average: 93 mA, Peak: 300 mA.
Electrical Connection: 1/2˝ NPT female with 4 conductor 22 AWG, 6´ (1.83 m)
long.
Process Connection: 1/2˝ NPT male.
Enclosure Rating: NEMA 4X (IP65).
Housing Materials: 316 SS, 416 SS, polycarbonate, neoprene, and acrylated
urethane.
Switch Type: 1 NO NPN, 1 NC NPN.
Input Power and Protection: 0.5A fuse (resettable) reverse polarity protected.
Switched Output Protection: 0.5A fuse (resettable) reverse polarity protected.
Agency Approvals: CE.
Ensure that the process fluid is compatible with the wetted
materials, and do not exceed the maximum device ratings.
Ensure that the system is not pressurized before installing or
removing this device or other objects from the system. The device
and/or object may become a projectile.
WARNING
NOTICE
Do not use with abrasive fluid mixtures (The polysulfone may be
abraded.)
Use caution if fluid temperature changes or fluid composition
changes are present in the end application. Verify that the device
operates properly if either is present. The setpoint will shift if the specific heat, density
or viscosity of the fluid changes.
NOTICE
W.E. ANDERSON
A DIVISION OF
DWYER INSTRUMENTS, INC.
P.O. BOX 373 • MICHIGAN CITY, INDIANA 46360, U.S.A.
Phone: 219/879-8000
www.dwyer-inst.com
Fax: 219/872-9057
e-mail: info@dwyermail.com
Mount the TDFS so that the sensor extends into the flow by 10-25% of the pipe ID.
Use PTFE tape on the process connection to reduce the risk of leaks. For proper flow
measurement, the sensor must be fully submerged in the fluid. Bubbles, turbulence,
and sediments will cause improper operation. For best operation, mount 30° to 150°
off vertical on horizontal runs (See Figure 2). Allow a straight run of at least 12 pipe diameters upstream and 5 pipe diameters downstream to ensure optimal flow measurement. For optimal repeatability, ensure the flow switch is not operating in the transition
region (laminar to turbulent flow).
30°
30°
BUBBLES
(AVOID)
OK
30°
OK
30°
SEDIMENTS
(AVOID)
Figure 2: Mounting Orientation
ELECTRICAL CONNECTION
The power input and switched outputs are individually fused at 0.5A and are reverse
polarity protected. A shielded 4 conductor cable provides the electrical connection to
the TDFS. The cable drain wire must be connected to earth ground in CE applications
or when strong RF fields are present.
Two open collector switched outputs are provided. One is normally open (NO), and the
other output is normally closed (NC). The output logic is shown in Table 1.
Condition
NO
NC
Flow Above Setpoint Closed Open
Flow Below Setpoint Open Closed
Off/Internal Fault
Open Open
Table 1: Open Collector Operation
TDFS
POWER (RED)
NO (WHITE)
LOAD(S)
+
–
NC (GREEN)
DC SUPPLY
9-24 VDC
GROUND (BLACK)
HOUSING (DRAIN WIRE)
EARTH
GROUND
Figure 3: Wiring Diagram
SETPOINT ADJUSTMENT
The setpoint may be adjusted with the supplied magnet. There are two setpoint targets
on the unit located under the LED status indicator on opposite sides of the unit (see
Figure 4). Either setpoint target may be used, and either end of the magnet may be
used. If the setpoint does not set easily, try reversing the magnet.
STATUS
INDICATOR
STATUS INDICATOR
The status indicator (See Figure 4) provides visual indication of the TDFS status. Two
status indicators are located on opposite sides of the unit. Each status indicator has
one red LED and one green LED. Table 2 describes the status indicator states.
If an error condition is present, the unit will continue measurement attempts until the
problem has cleared. The status indicator will cycle on and off during this time.
Description
Off
Dimmed Pulses
State
Waiting for first measurement or unit is off
Start of a measurement cycle (normal
operation)
Red
Steady
Flow is below the setpoint
Green
Flow is above the setpoint
Variable Length
Red & Green Error condition:
(1) Process temperature is out of range
(2) Internal fault
Slow Blink (2/3 second) Any
A setpoint adjustment was requested
Green
Flow is in the nominal range
Red & Green Flow is below the nominal range
Alternating
Setpoint will be limited to the maximum
allowable flow
Table 2: Status Indicator States
NOTICE
Velocity
1/2˝ Pipe
3/4˝ Pipe
ft/s (m/s) in w.c. (kPa) in w.c. (kPa)
0.5 (0.15) 0
0
1.0 (0.31) 0
0
2.0 (0.61) 0
0.2 (0.045)
3.0 (0.91) 0.2 (0.045)
0.4(0.099)
4.0 (1.22) 0.5 (0.125)
0.7 (0.174)
5.0 (1.52) 0.7 (0.174)
1.2 (0.299)
6.0 (1.83) 2.6 (0.648)
1.7 (0.423)
7.0 (2.13) 3.3 (0.822)
2.1 (0.523)
8.0 (2.44) 4.3 (1.071)
2.7 (0.673)
9.0 (2.74) 3.5 (0.872)
3.4 (0.847)
10.0 (3.05) 4.5 (1.121)
4.2 (1.046)
Table 3: Pressure Drop (water)
AGENCY APPROVALS AND TEST STANDARDS
CE: CENELEC EN 55011: 2006
CENELEC EN 61326-1: 2006
IEC 61000-4-2: 2008
IEC 61000-4-3: 2006
IEC 61000-4-4: 2004
IEC 61000-4-5: 2005
IEC 61000-4-6: 2006
CENELEC EN 55022: 2006
FCC PART 15 CFR TITLE 47: 2008
ICES-003: 2004 Digital Apparatus (Industry Canada)
ANSI C63.4-2003
2004/108/EC EMC DIRECTIVE
MAINTENANCE/REPAIR
Upon final installation of the Series TDFS, no routine maintenance is required. The
Series TDFS is not field serviceable and should be returned if repair is needed. Field
repair should not be attempted and may void warranty.
This symbol indicates waste electrical products should not be disposed
of with household waste. Please recycle where facilities exist. Check with
your Local Authority or retailer for recycling advice.
Figure 4: Set Point Target
Steps:
1) Ensure that the unit is properly installed and powered.
2) Set the system flow to the desired setpoint flow rate.
3) Tap the setpoint target three times with the supplied magnet. Move the magnet
approximately 2 inches away from the target between each tap. The taps should
be approximately 1 second apart. The LED status indicator will blink slowly when
the setpoint request is recognized. The slow blink will stop when the setpoint has
been stored.
W.E. ANDERSON
Design a fail-safe system that takes into consideration the
possibility of switch failure, power failure and operator error.
PRESSURE DROP
SETPOINT
TARGET
©Copyright 2019 Dwyer Instruments, Inc.
Color
N/A
Any
WARRANTY/RETURN
Refer to “Terms and Conditions of Sales” in our catalog and on our website. Contact
customer service to receive a Return Goods Authorization number before shipping the
product back for repair. Be sure to include a brief description of the problem plus any
additional application notes.
PARTS
If the magnet is lost another can be ordered from Dwyer with part number 100571-00.
Printed in U.S.A. 2/19
A DIVISION OF
DWYER INSTRUMENTS, INC.
P.O. BOX 373 • MICHIGAN CITY, INDIANA 46360, U.S.A.
FR# 443813-00 Rev. 5
Phone: 219/879-8000
dwyer-inst.com
Fax: 219/872-9057
e-mail: info@dwyermail.com
Was this manual useful for you? yes no
Thank you for your participation!

* Your assessment is very important for improving the work of artificial intelligence, which forms the content of this project

Download PDF

advertising