Series TDS Thermal Dispersion Flow Switch


The Series TDS Thermal Dispersion Flow Switch offers solid state flow detection of non-coating liquids for pump and process protection. SPDT output allows for interfacing with remote PLC or relay control device. The adjustable switch point is factory calibrated at 0.2 fps with LED indication of flow and calibration status. Units feature selectable NO or NC operation and are not damaged by over-ranging flow velocities.


Wetted MaterialsPolypropylene/PPS or Polyvinylidene Fluoride.
Range: 0.04 to 10 fps (1.2X10-2 to 3.05 m/s)
Temperature Limit32 to 140°F (0 to 60°C).
Pressure Limit150 psi (10 bar) @ 77°F (25°C), derated @ 1.667 psi (.113 bar) per °C above 25°C.
Repeatability±5% of setpoint.
Switch TypeSPDT.
Electrical Rating60 VAC/60 VDC @ 1 A.
Electrical Connections22 AWG 3-wire, 10 ft (3 m) length.
Process Connection3/4″ male NPT.
Mounting OrientationAny orientation, for pipe sizes 3/4″ to 1-1/2″ use 3.0″ (7.6 cm) length switch; for 2″ to 16″ pipe sizes use 4.5″ (11.4 cm) length switch.
Setpoint Adjustment0.04 to 3 fps (1.2X10-2 to .91 m/s).
Setpoint Drift0.5% of setpoint.
Response Time1-10 seconds.
Viscosity Range1 to 200 centipoise.
Supply Voltage12 to 36 VDC.
Consumption50 mA (nominal).
IndicationLED for flow status.
Weight3 oz (94 g).
Agency ApprovalsCE