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Dwyer Model S-DT Liquid Level Switch

For Sludge, Slurry, or Liquids

A unique patented Magnetic Linkage in the S-DT Liquid Level Switch isolates the electrical compartment, containing one or two switches, from controlled product. This reduces maintenance and improves sensitivity. The sealed switch compartment and sealed leads yield highly reliable operation. A variety of switch types, options, mounting choices and thumbwheel adjustable ranges is available to fit your specific application. The S-DT is very sensitive and economical. The force required to depress the diaphragm and trip the switch(es) is in inches water column. The simple design has been proven rugged and reliable providing long life in the most severe applications.

See Dimensions

Service: Compatible liquids.
Wetted Materials:
Mounting Flange: See Popular Models chart. Aluminum, carbon steel, PVC, or 316 SS available.
Diaphragm: See Popular Models chart. Viton®, Neoprene, Urethane, Buna-N, Teflon®, Silicone rubber, or food grade available.
Temperature Limits: 180°F (82.2°C) suspended in liquid, 220°F (104.4°C) exterior tank mounted.
Pressure Limit: 75 psig (5.2 bar).
Enclosure Rating: Weatherproof and submersible.
Repeatability: ±1 to 3% of full range. Contact factory for specific values.
Switch Type: SPDT snap switch or SPDT gold contact snap switch. One or two switches available.
Electrical Rating: Snap Switch: 15A @ 125/250/480 VAC. Gold Contact Snap Switch: 1A @ 24 VDC/125 VAC.
Electrical Leads: 18 gage solid core, 600 volt TEW 105°C style 1015. Epoxy sealed at conduit entrance. 36" (914.4 mm) long.
Conduit Connection: 1/2" female NPT.
Process Connection: See Popular Models chart. 2" flange, 3" flange, 4" flange, 1/2" to 3" NPT, or suspended depending on model.
Mounting Orientation: Flange mount, screw in, or suspend depending on model.
Set Point Adjustment: Internal screw. Adjustable anywhere within the pressure range.
Weight: 6 lb (2.72 kg).
Ranges: 6 to 12" w.c. (1.49 to 2.99 kPa), 11 to 24" w.c. (2.74 to 5.97 kPa), and 22 to 48" w.c. (5.47 to 11.9 kPa).
Deadband: Approximately 20% of range. Contact factory for specific values. Optional wide deadband of approximately 50%.
Options: Suspension kits and dip tube kits.
Popular Models
Model Number Description
 A1FP20  S-D with 1 standard switch, 4" aluminum flange (6-12" range), neoprene diaphragm, anodized aluminum housing
 A2FS20  S-D with 2 standard switches, 4" aluminum flange (6-12" & 6-12" ranges) neoprene diaphragm, anodized aluminum housing
 A2IV20  S-D with 2 standard switches, 3" carbon steel flange adapter (6-12" & 22-48" ranges), neoprene diaphragm, anodized aluminum housing
 A5FS20  S-D with 2 gold switches, 4" aluminum flange (6-12" & 6-12 ranges) neoprene diaphragm, anodized aluminum housing