Series TDFS2 Thermal Dispersion Flow Switch

Non-Mechanical, Low Pressure Drop

The Series TDFS2 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 on catalog page for output and LED actions on change of flow.

Product Applications

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

Models & Ordering

Shipping Information

All shipping times are dependent on product availability at time of shipment.

Although we make every effort to ensure a continuous supply of our products, occasional circumstances may force us to temporarily run out of a product, or have shipping delays. Should this occur, customers will be notified soon after placement of any orders for such products and, if applicable, items will be put on backorder. For orders requiring expedited shipment, our customer service team can be contacted to confirm product availability

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Model Description Usually Ships* Price Order
TDFS2-1-P-06
Ships: Next Day
Price: $195.00
Thermal dispersion flow switch, 316SS, 1/2" NPT process connection, 6' of cable with cable gland. Next Day* $195.00 Order

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Specifications

Service:
Compatible water-based fluids.
Wetted Materials:
316SS.
Set Point Range:
0.5 to 10 ft/s (0.15 to 3.0 m/s).
Repeatability:
0.07 ft/s +3% of set point.
Typical Deadband:
0.1 ft/s +15% of set point.
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:
Approx. 8 s.
Power Requirement:
9 to 24 VDC.
Switching Current:
400 mA, de-rate 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.

Features

  • Better 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 as it avoids overheating by actively heating above the process temperature and then cooling down to process temperature
  • Set point is easily field set by tapping the included magnet on the set point target three times at the desired flow rate
  • LED status indicators provide visual switch indication of flow rate in comparison to the set point
  • Low pressure drop; only needs to be inserted 10% into the flow (e.g. 1/8" for 3/4" schedule 40 pipe)

Options

  • Consult factory for longer cable lengths.

Accessories

Model Number Description Usually Ships* Price Order
100571-00 Replacement set point magnet Less Than 1 Week $4.20 Order

Videos

Model Chart

TDFS2-X-X-X-OPT   TDFS THERMAL DISPERSION FLOW SWITCH

          1ST SYMBOL (1ST X) CONSTRUCTION
             1    STAINLESS STEEL           

          2ND SYMBOL (2ND X) CABLE TYPE
             P    PVC JACKETED CABLE
             B    BURIAL RATED CABLE

          3RD SYMBOL (3RD X) CABLE LENGTH
             03   CABLE LENGTH 3 FEET
             06   CABLE LENGTH 6 FEET
             10   CABLE LENGTH 10 FEET
             15   CABLE LENGTH 15 FEET
             20   CABLE LENGTH 20 FEET
             25   CABLE LENGTH 25 FEET
             30   CABLE LENGTH 30 FEET
             35   CABLE LENGTH 35 FEET
             40   CABLE LENGTH 40 FEET
             45   CABLE LENGTH 45 FEET
             50   CABLE LENGTH 50 FEET

Product Literature

Manuals

Catalog Pages

SlideShare

Approvals

Drawings

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