Dwyer TDFS2 Manual

Download

RGET

[106.17]

Series TDFS2 Thermal Dispersion Flow Switch

HIGHER

Specications - Installation and Operating Instructions

Bulletin F-TDFS2-1

4-3/16

1-21/64

[33.78]

TDFS2-1-P-06 TDFS2-1-P-06TDFS2-2-P-06 TDFS2-2-P-06

The Series TDFS2 Thermal Dispersion Flow Switch is a thermal ow switch that indicates whether the ow rate is above or below a user set ow rate. The unit incorporates two LED status indicators providing visual switch indication. The set ow rate (setpoint) is eld adjustable and the unit has both NO and NC NPN outputs. See Figure 1 for output and LED actions on change of ow.

NC = OPEN, NO = CLOSED, LED = GREEN

FLOW

NC = CLOSED, NO = OPEN, LED = RED

Figure 1: Switch setpoint and deadband

OPERATING PRINCIPLE

The TDFS2 uses an impulse thermal dispersion measurement technique to measure the ow rate. The probe is heated above the process temperature and then is allowed to cool. The ow rate is determined from the rate at which the probe cools. The measurement cycle time is approximately 8 seconds.

INSTALLATION

NOTICE

Ensure that the process uid is compatible with the wetted materials, and do not exceed the maximum device ratings.

DEADBAND

SETPOINT

CABLE

CABLE GLAND

STATUS INDICATOR

SETPOINT TARGET

PROCESS CONNECTION 1/2˝ NPT

29/64 [11.68]

1-1/8 HEX

SPECIFICATIONS

Service: Compatible water-based uids. Wetted Materials: 316 SS. Pipe Range: 1/2 to 1-1/2˝ (15 to 40 mm) or 2 to 10˝ (50 to 250 mm) (model

selectable).

Setpoint Range: 0.5 to 10 ft/s (0.15 to 3.0 m/s). Repeatability: 0.07 ft/s (0.02 m/s) +3% of setpoint. Typical Deadband: 0.1 ft/s (0.03 m/s) +15% of setpoint. Temperature Limits: Ambient: 5 to 140°F (-15 to 60°C); Process: 5 to 140°F (-15

to 60°C), Storage: -40 to 185°F (-40 to 85°C).

Pressure Limits: 300 psig (20.67 bar). Response Time: Approximately 8 s. Power Requirement: 9-24 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 or cable gland with 4 conductor 22 AWG

6´ (1.83 m) long (model selectable).

Process Connection: 1/2˝ NPT or BSPT male (model selectable). 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.

SENSOR

5-5/8

[142.88]

2-25/32

[70.49]

1-1/8 HEX

1-29/32

[48.26]

CABLE

CABLE GLAND

STATUS INDICATOR

SETPOINT TA

PROCESS CONNECTION 1/2˝ NPT OR BSPT

SENSOR

WARNING

system. The device and/or object may become a projectile.

NOTICE

operates properly if either is present. The setpoint will shift if the specic heat, density or viscosity of the uid changes.

Severe injury may occur. Ensure that the system is not pressurized before installing or removing this device or other objects from the

Do not use with abrasive uid mixtures.

Use caution if uid temperature changes or uid composition changes are present in the end application. Verify that the device

DWYER INSTRUMENTS, INC.

P.O. BOX 373 • MICHIGAN CITY, INDIANA 46360, U.S.A.

MODEL CHART

Example TDFS2 -1 -C -06 -BSPT TDFS2-1-C-06-BSPT Series TDFS2 Thermal dispersion ow switch Pipe Size 1

Electrical Connection*

Cable Length X Cable length (ft.)

Options BSPT 1/2˝ BSPT process connection *Per ft cable length adder.

C B P

Phone: 219-879-8000

Fax: 219-872-9057

1/2 to 1-1/2˝ (15 to 40 mm) pipe sizes 2 to 10˝ (50 to 250 mm) pipe sizes 1/2˝ female NPT with PVC cable for conduit connection Cable gland with burial rated cable Cable gland with PVC jacketed cable

www.dwyer-inst.com

e-mail: info@dwyermail.com

APPROXIMATE FLOW RATES FOR COLD WATER IN SS TEE AND CARBON STEEL

TDFS

SCHEDULE 40 PIPE: TDFS2-1-X-X Pipe Size 1/2˝ (15 mm) 3/4˝ (20 mm) 1˝ (25 mm) 1-1/4˝ (32 mm) 1-1/2˝ (40 mm)

GPM (LPM) 0.47-9.42

(1.78-35.66)

APPROXIMATE FLOW RATES FOR COLD WATER IN SS TEE AND CARBON STEEL SCHEDULE 40 PIPE: TDFS2-2-X-X Pipe Size 2˝ (50 mm) 3˝ (80 mm) 4˝ (100 mm) 5˝ (125 mm) 6˝ (150 mm) 8˝ (200 mm) 10˝ (250 mm)

GPM (LPM) 5.25-104.98

(19.87-397.39)

0.82-16.47 (3.10-62.35)

11.55-230.91 (43.72-874.09)

1.35-27.01 (5.11-102.24)

19.9-397.9 (75.33-1506.21)

2.33-46.66 (8.82-176.63)

31.24-624.81 (118.26-2365.16)

3.18-63.51 (12.04-240.41)

45.14-902.7 (170.87-3417.08)

78.01-1560.17 (295.30-5905.87)

122.99-2459.81 (465.57-9311.36)

Mount the TDFS2 so that the sensor extends into the ow by 10-25% of the pipe ID. Use PTFE tape on the process connection to reduce the risk of leaks. For proper ow measurement, the sensor must be fully submerged in the uid. 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 ow measurement. For optimal repeatability, ensure the ow switch is not operating in the transition region (laminar to turbulent ow).

30° 30°

BUBBLES [AVOID]

OK OK

SEDIMENT

30° 30°

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 TDFS2. The cable drain wire must be connected to earth ground in CE applications or when strong RF elds 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 Flow Below Setpoint Off/Internal Fault

Table 1: Open collector operation

[AVOID]

Closed Open Open

Open Closed Open

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 INDICATO

SETPOINT TARGET

Figure 4: Set point target

Steps:

1) Ensure that the unit is properly installed and powered.

2) Set the system ow to the desired setpoint ow 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.

POWER (RED)

NO (WHITE)

NC (GREEN)

GROUND (BLACK)

HOUSING (DRAIN WIRE)

Figure 3: Wiring diagram

Ensure that units with conduit opening are properly sealed with appropriate conduit.

LOAD(S)

EARTH GROUND

–

DC SUPPLY 9-24 VDC

STATUS INDICATOR

The status indicator (See Figure 4) provides visual indication of the TDFS2 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 Color State

Off Dimmed Pulses

Steady

Intermittent

Slow Blink

NOTICE

PRESSURE DROP

TDFS2-1-X-X TDFS2-2-X-X 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˝ (15 mm) 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)

N/A Any

Red Green Red and Green

Any Green Red and Green Alternating

Table 2: Status indicator states

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

3/4˝ (20 mm) 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)

Waiting for rst 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 ow

2-1/2˝ (65 mm) in w.c. (kPa)

0.1 (0.013)

0.1 (0.045)

0.4 (0.095)

0.7 (0.164)

1.0 (0.252)

1.4 (0.358)

1.9 (0.482)

2.5 (0.625)

3.1 (0.787)

3.9 (0.967)

Table 3: Pressure drop (water)

4˝ (100 mm) in w.c. (kPa)

0 0 0

0.1 (0.018)

0.1 (0.033)

0.2 (0.053)

0.3 (0.078)

0.4 (0.107)

0.6 (0.141)

0.7 (0.180)

0.9 (0.224)

6˝ (150 mm) in w.c. (kPa)

0 0 0 0

0.1 (0.017)

0.1 (0.025)

0.1 (0.035)

0.2 (0.047)

0.2 (0.060)

0.3 (0.075)

0.4 (0.091)

MAINTENANCE/REPAIR

Upon nal installation of the Series TDFS2, no routine maintenance is required. The Series TDFS2 is not eld 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.

WARRANTY/RETURN

Refer to “Terms and Conditions of Sale” in our catalog and on our website. Contact customer service to receive a Return Materials Authorization (RMA) number before shipping the product back for repair. Be sure to include a brief description of the problem plus any additional application notes.

PARTS

Replacement magnets (part number 100571-00) may be ordered from Dwyer Instruments, Inc.

8˝ (200 mm) in w.c. (kPa)

0 0 0 0 0

0.1 (0.014)

0.1 (0.020)

0.1 (0.028)

0.1 (0.037)

0.2 (0.047)

0.2 (0.058)

10˝ (250 mm) in w.c. (kPa)

0 0 0 0 0 0

0.0 (0.010)

0.0 (0.012)

0.1 (0.014)

0.1 (0.017)

0.1 (0.019)

NOTES

__________________________________________________________________________________________________________________________________________

DWYER INSTRUMENTS, INC.

P.O. BOX 373 • MICHIGAN CITY, INDIANA 46360, U.S.A.

Phone: 219-879-8000

Fax: 219-872-9057

www.dwyer-inst.com

e-mail: info@dwyermail.com

Dwyer TDFS2 Manual

Specifications and Main Features

Frequently Asked Questions

User Manual