Dwyer | Mercoid | WE Anderson | Flotect

Dwyer Series FDT

Series FDT Flush Diaphragm Transmitter

Dwyer Series FDT
Series FDT

Non-liquid Filled, ±0.5% F.S.O. Accuracy, SS Wetted Parts

The Dwyer Series FDT Flush Diaphragm Transmitter is designed for highly cyclical conditions. Flush sensor feature prevents any potential inaccuracies due to build-up or blockage which is a typical problem found in most non-flush transmitter sensors. Units have a non-oil filled sensor element that provides resistance to temperature fluctuations. Manufactured from a solid piece of steel, the sensing diaphragm can withstand the most abrasive/cyclical applications. Series FDT transmitters perform well in high cyclical environments with the presence of water-hammering or spiking.

Flush feature greatly reduces chance of leakage. Tough materials allow the unit to withstand harsh process conditions. Advanced manufacturing techniques, extreme environmental burn-in, and thorough residual stress relieving procedures ensure unit will maintain its high performance standard over time.



  • Service:Compatible liquids and gases, adhesives, slurries, materials that can harden, or where a pressure cavity is not desired.
  • Wetted Materials:316 & 15-5 SST.
  • Accuracy:±0.5% FS (includes non-linearity, hysteresis, and repeatability).
  • Stability:±0.25% FS per year.
  • Temperature Limits:-40 to 200°F (-40 to 93°C).
  • Compensated Temperature Limits:0 to 170°F (-18 to 77°C).
  • Pressure Limit:150% FS; Burst: 200% FS.
  • Thermal Effect:±1.5% FSO over compensated range.
  • Power Requirements:8-38 VDC.
  • Output Signal:FDT-A: 4-20 mADC; FDT-V: 0-5 VDC.
  • Response Time:<1mS.
  • Loop Resistance:FDT-A: 0-1.5 ohms; FDT-V: ≤100 ohms.
  • Electrical Connections:4 pin.
  • Process Connection:7/16-20 UNF male flush diaphragm. Optional 1/4″ male NPT.
  • Enclosure Rating:NEMA 4X (IP66).
  • Mounting Orientation:Mount in any position.
  • Weight:2 oz (57 g).
  • Agency Approval:CE.



  • P/N A-168 Mating connector for 4 pin M-12.
  • NISTCAL-PT1 NIST traceable calibration certificate for pressure transmitters.NOTE: EQUAL CERTS WILL BE CHARGED PER UNITS PURCHASED.