Dwyer Series TDFS2 Thermal Dispersion Flow Switch

Name: Dwyer Series TDFS2 Thermal Dispersion Flow Switch
Brand: Dwyer

Dwyer Series TDFS2 Thermal Dispersion Flow Switch

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 easily field adjustable with included magnet and the unit has both NO and NC NPN outputs. Available for pipe sizes ½” to 1-1/2” and 2” to 10”.

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
Long operation life, as it is not affected by empty pipe by avoiding overheating with heating above the process temperature and then cooling down to process temperature
Lower system run cost due to low-pressure drop with 10% insertion into the flow (e.g. 1/8″ for 3/4″ schedule 40 pipe)

Protects pumps, motors and other equipment against low or no flow
Controls sequential operation of pumps
Automatically starts auxiliary pumps
Flow / No Flow verification for valve automation systems

PRODUCT MANUAL

Service / Media	Compatible water-based fluids
Flow Setpoint Range	0.5 to 10 ft/s (0.15 to 3.0 m/s)
Wetted Materials	316 SS
Output / Switch	1 NO NPN, 1 NC NPN
Power Supply	9–24 VDC
Operating Temperature	Ambient & process: 5 to 140 °F (-15 to 60 °C); storage: -40 to 185 °F (-40 to 85 °C)
Pressure Limit	300 psig (20.67 bar)
Process Connection	1/2" NPT or BSPT male (model selectable)
Enclosure Rating	NEMA 4X (IP65)
Agency Approvals	CE