W.e. anderson div., dwyer instruments, inc – Dwyer TDFS User Manual

Page 2

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).

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.

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.

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.

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.

PRESSURE DROP

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.

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.

BUBBLES

(AVOID)

SEDIMENTS

(AVOID)

FIGURE 2: Mounting Orientation

TABLE 1: Open Collector Operation

Condition
Flow Above Setpoint
Flow Below Setpoint
Off/Internal Fault

NO
Closed
Open
Open

NC
Open
Closed
Open

POWER (RED)

NO (WHITE)

NC (GREEN)

TDFS

GROUND (BLACK)

HOUSING (DRAIN WIRE)

LOAD(S)

DC SUPPLY

9-24 VDC

EARTH

GROUND

–

FIGURE 3: Wiring Diagram

STATUS

INDICATOR

SETPOINT

TARGET

FIGURE 4: Set Point Target

Description
Off
Dimmed Pulses

Steady

Variable Length

Slow Blink
(2/3 second)

Color
N/A
Any

Red
Green
Red & Green

Any
Green
Red & Green
Alternating

State
Waiting for first measurement or unit is off
Start of a measurement cycle
(normal operation)
Flow is below the setpoint
Flow is above the setpoint
Error condition:
(1) Process temperature is out of range
(2) Internal fault
A setpoint adjustment was requested
Flow is in the nominal range
Flow is below the nominal range
Setpoint will be limited to the maximum
allowable flow

TABLE 2: Status Indicator States

Velocity
ft/s (m/s)
0.5 (0.15)
1.0 (0.31)
2.0 (0.61)
3.0 (0.91)
4.0 (1.22)
5.0 (1.52)
6.0 (1.83)
7.0 (2.13)
8.0 (2.44)
9.0 (2.74)
10.0 (3.05)

1/2˝ Pipe
in w.c. (kPa)
0
0
0
0.2 (0.045)
0.5 (0.125)
0.7 (0.174)
2.6 (0.648)
3.3 (0.822)
4.3 (1.071)
3.5 (0.872)
4.5 (1.121)

3/4˝ Pipe
in w.c. (kPa)
0
0
0.2 (0.045)
0.4(0.099)
0.7 (0.174)
1.2 (0.299)
1.7 (0.423)
2.1 (0.523)
2.7 (0.673)
3.4 (0.847)
4.2 (1.046)

TABLE 3: Pressure Drop (water)

Design a fail-safe system that takes into consideration the
possibility of switch failure, power failure and operator error.

NOTICE

Printed in U.S.A. 5/13

FR# 82-443813-00 Rev.1

W.E. ANDERSON DIV., DWYER

INSTRUMENTS, INC.

P.O. BOX 358 • MICHIGAN CITY, INDIANA 46360 U.S.A.

Phone: 219/879-8000

www.dwyer-inst.com

Fax: 219/872-9057

e-mail: [email protected]