Models 732.31, 732.51

Differential Pressure Gauges

Process Industry Design, All Welded Construction, Diaphragm Element Series

Selected documents
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  • For gaseous and liquid aggressive media that are not highly viscous or crystallizing. Also suitable in aggressive environments
  • Monitoring and control of pumps
  • Filter monitoring
  • Level measurement in closed tanks

Product features

  • Differential pressure measuring ranges from 0 ... 6” WC (16 mbar)
  • High working pressure (static pressure) up to 600 psi (40 bar)
  • High overpressure safe up to 600 psi (40 bar)
  • All welded media chamber


Lower mount process connections, highly corrosion-resistant all-metal construction, measuring cell protected against tampering. Location of process connection can be modified to mounting requirements. WIKA trade pattern DT - GM 86 08 176

4” (100 mm)
6” (160 mm)

Accuracy Class

0 ... 6” WC (16 mbar) up to 0 ... 360 psi (25 bar)
Scale range 0 ...6” WC (25 bar): Scale length approx. 180 degrees of angle
Other equivalent differential pressure ranges or compound ranges available.

Working Pressure
Steady: full-scale value
Fluctuating: 0.9 x full-scale value

Operating Temperature
Ambient:-4°F...+140°F (-20...+60°C)
Medium: + 212°F (+100°C) maximum

Temperature error
Additioanal error when temperature changes from reference temperature of 68°F (20°C) ± 0.5% of span for every 18°F (10K°) rising or falling.

Ingress protection
NEMA 3 (IP 54 per EN 60529 / IEC 529) 
NEMA 4 (IP 66) with liquid filling

Measuring chamber with process connection (wetted)
316 SS
lower mount (LM),
2 x ¼“ NPT female

Pressure elements (wetted)
≤ 100“ WC (250 mbar): 316 SS
> 100“ WC (250 mbar): NiCr-alloy (Inconel®)

Sealing bellows (wetted)
316 SS

Venting of the media chambers (wetted)
316 SS for scale ranges ≤ 100“ WC (250 mbar)
(optional for scale ranges > 100“ WC)

Stainless steel

Aluminium, white, black lettering

Model 732.51: Adjustable pointer, aluminium, black
Model 733.51: Standard pointer, aluminium, black

Stainless steel, with pressure relief disc

Laminated safety glass

Bezel ring
Bayonet ring, stainless steel

Gauge Mounting
Pressure ports marked ⊕ and ⊖
⊕ high pressure
⊖ low pressure

Mounting by means of:
■ Direct mounting
■ Mounting holes in measuring flange
■ Front flange (optional)
■ Mounting bracket for wall or pipe mounting (optional)

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