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Mark III Handheld Digital Manometer

Series 475

The Dwyer® Series 475 Mark III Handheld Digital Manometer is ideal for field calibration, monitoring or trouble shooting HVAC systems, clean rooms or a wide range of other low pressure pneumatic systems. This handy instrument measures positive, negative or differential pressures of air and natural gases in ranges from 1" w.c. (0.249 kPa) to 150 psid (10.34 bar). The Series 475-FM is approved and is intrinsically safe for hazardous locations, Class 1, Div.1, Group A, B,C, D, T4. Its simple operation and easy to read digital display make it an indispensable test instrument for the plant engineer, industrial hygienist and HVAC technician. When used with a Dwyer® Pitot tube, the Series 475 Mark III can also be used as an air velocity gage.

  • Service: Air and compatible combustible gases
  • Wetted Materials: Consult factory
  • Accuracy: ±0.5% F.S., 60 to 78°F (15.6 to 25.6°C); ±1.5% F.S. from 32 to 60°F and 78 to 104°F (0 to 15.6°C and 25.6 to 40°C)
  • Pressure Hysteresis: ±0.1% of full scale
  • Pressure Limits: See catalog page
  • Temperature Limits: 0 to 140°F (-17.8 to 60°C)
  • Compensated Temperature Limits: 32 to 104°F (0 to 40°C)
  • Storage Temperature Limits: -4 to 176°F (-20 to 80°C)
  • Display: 0.42" (10.6 mm) 4-digit LCD
  • Resolution: See Ordering page
  • Power Requirements: 9 V alkaline battery, installed non-functional, user replaceable
  • Weight: 10.8 oz. (306 g)
  • Connections: Two barbed connections for use with 1/8" (3.18 mm) or 3/16" (4.76 mm) I.D. tubing. Two compression fittings for use with 1/8" (3.18 mm) I.D. x 1/4" (6.35 mm) O.D. tubing for 475-7-FM & 475-8-FM only
  • Agency Approvals: CE, FM

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