Series TDFS Thermal Dispersion Flow Switch

Non-Mechanical, Low Pressure Drop

The SERIES TDFS Thermal Flow Switch uses impulse thermal dispersion measurement technique to indicate whether the flow rate is above or below a user set flow rate. It provides NO and NC NPN outputs and two LED, one green and one red for high and low set point indication.

Product Applications

  • Boiler flow proving
  • Hot water heaters
  • Chillers
  • Liquid transfer systems

Models & Ordering

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Model Description Usually Ships Price Order
TDFS-1-P-06
Ships: Next Day
Price: $175.00
Thermal Dispersion Flow Switch, 316SS and polysulfone, 1/2" NPT process connection, 6' of cable with cable gland. Next Day $175.00 Order

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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:
4 conductor 22 AWG, 6' (1.83 m) long with cable gland.
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.

Features

  • Better long term reliability and life expectancy than mechanical flow switches with no paddles or vanes to wear or break, no jams in the paddle movement, and no seals on movement assembly to wear or leak
  • Not affected by empty pipe detection and avoids overheating by actively heating above the process temperature and then cooling down to process temperature
  • Set point is easily field set by taping the included magnet on the set point target three times at the desired flow rate
  • LED status indicators provide visual switch indication of set point
  • Low pressure drop, only needs to be 10% into the flow (e.g. 1/8" for 3/4" schedule 40 pipe)

Accessories

Model Number Description Usually Ships Price Order
100571-00 Replacement set point magnet Less Than 1 Week $4.00 Order

Videos

Model Chart

EXAMPLE TDFS 1 P 10 Series TDFS-1-P-10 Thermal Dispersion Flow Switch, 316SS and polysulfone body, PVC jacketed cable, 10' length.
SERIES TDFS       Thermal Dispersion Flow Switch
CONSTRUCTION   1
2
    316SS and Polysulfone Body
Glass Seal
CABLE TYPE     P
B
  PVC Jacketed Cable
Burial Rated Cable
CABLE LENGTH       03
06
10
15
20
25
30
35
40
45
50
3 Ft. Cable 
6 Ft. Cable
10 Ft. Cable
15 Ft. Cable
20 Ft. Cable
25 Ft. Cable
30 Ft. Cable
35 Ft. Cable
40 Ft. Cable
45 Ft. Cable
50 Ft. Cable

Product Literature

Manuals

Catalog Pages

Approvals

Drawings

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