Models 712.15.160, 732.15.160

Differential pressure gauge

Cu-alloy or stainless steel version



  • Level measurement in closed tanks, particularly in cryotechnology
  • Filter monitoring
  • Monitoring and control of pumps
  • For gaseous and liquid media that are not highly viscous or crystallising and have no suspended solids

Special Features

  • Differential pressure measuring ranges from 0 ... 40 mbar to 0 ... 4000 mbar
  • High working pressure (static pressure) up to 50 bar
  • Overpressure safety either side up to 50 bar
  • Scaleable measuring ranges (maximum Turn Down of 1 : 3.5)
  • Option: Remote data transfer module intelliMETRY
  • Option: Compact valve manifold with working pressure indication



These high-quality gauges are characterised by their compact and robust design and are primarily used for level measurement on liquid gas tanks.

With only 6 different measuring cells all usual tank sizes in cryotechnology are covered. As a result of the large measuring range overlap of the respective measuring cells, the gauge installed on the tank can be adjusted to match a whole variety of gases such as Ar, O2, N2 or CO2, with a full-scale deflection over a complete 270 degree sweep. The span adjustment is accessible from outside and does not affect the zero point. The mechanical display and the optional electrical output signal are calibrated simultaneously and easily.

An optional valve manifold for flange mounting with working pressure indication makes the central measurement of both level and working pressure possible in the one instrument.

The level display can be supplied with an optional, integrated 4 … 20 mA, 2-wire transmitter. Switch contacts for level and working pressure, as well as a transmitter for the working pressure can be retrofitted on site.

The standard centre distance of 37 mm between the process connections can be adapted to a custom centre distance of 31 mm or 54 mm using adapters for flange mounting.

Model 612.20

Low Pressure Capsule Gauge

Stainless Steel Case, Copper Alloy Wetted Parts



  • Low pressure pneumatic systems
  • Suitable for fluid medium, gaseous or dry that does not corrode copper alloy.

Product features

  • Low pressure series
  • Copper alloy wetted parts & stainless steel case
  • Capsule pressure gauge



2.5", 4" & 6" (63 mm, 100 mm & 160 mm)

Accuracy class
± 1.5% of span

Ranges (All ranges not stocked)
Size 2.5": (63 mm): 0...10 (25 mbar) to 0...250" H2O (600 mbar)
Size 4" (100 mm): 0...4" H2O (10 mbar) to 0...250" H2O (600 mbar)
Size 6" (160 mm):  0...2.5" H2O (600 mbar)
or all other equivalent vacuum or compound ranges

Copper alloy
Size 2½ (63 mm): 
¼" NPT lower moutn (LM) or center back moutn (CBM)
Size 4" & 6" (100 mm & 160 mm): ¼" NPT or ½" NPT lower mount (LM) or lower back mount (LBM)

Capsule Element
Material: copper alloy

Copper alloy, nickel-silver pinion gear and shaft.
Zero adjustment screw on dial

White aluminum with black lettering

Black aluminum (zero adjust on dial. Must remove
window to access)


304 stainless steel with stainless steel bayonet ring

Weather Protection
Weather resistant (NEMA 3 / IP 54)

Standard Scales
in. H2O/mm H2O
oz.-sq. in./mm H2O
oz.-sq. in./in. H2O

Window Gasket

Flat instrument glass

Working Range
Steady: Full scale value
Fluctuating: 0.9 x full scale value

Operating Temperature
Ambient:   -4°F to 140°F (-20°C to 60°C)
Media:      max. 212°F (+100°C)
                 max. 176°F (+80°C) for 4” & 6" LBM

Temperature error
Additional error when temperature changes from reference temperature of 68°F (20°C) +0.6% of span for every 18°F (10°C) rising or falling.

Model 632.51

Low Pressure Capsule Gauges

Stainless Steel Case, High Overpressure Safety



  • Suitable for pressure measurement at very low pressures
  • All stainless steel design suitable for gaseous, aggressive media in corrosive environments
  • Robust design and ingress protection NEMA 3 (IP54), suitable for outdoor use

Product features

  • High overpressure safety up to 50 x full scale value
  • Measuring chamber protected against tampering
  • Low measuring error and influence on function from medium pollution


Nominal Sizes
4" and 6" (100 and 160 mm)

+/- 1.6% of full scale scale value 

From 0...1" H2O (2.5 mbar) to 0...40" H2O (100 mbar)
or all other equivalent vacuum or compound ranges

Pressure limitation
Steady: Full scale value
Fluctuating: 0.9 x full scale value

Overpressure safety
50 x full scale value

Permissible temperature
Ambient:-4oF...+140oF (-20...+60oC)
Meduim: +212oF (+100oC maximum)

Temperature error
Additional error when temperature changes from reference temperature of 68°F (20°C) +0.6% of span for every 18°F (10°C) rising or falling.

Ingress protection
NEMA3 (IP 54 per EN 60529/IEC 529)

Process connection (wetted)
316 stainless steel lower mount,
1/2" (male), 22 mm wrench flat

Pressure element (wetted)
316 stainless steel

Measuring chamber (wetted)
316 Stainless steel

Sealing (wetted)

Stainless steel

Aluminum, white, black lettering

Adjustable pointer, aluminum, black

Zero adjustment
By means of adjustable pointer

Stainless steel, with pressure relief plug

Laminated safety glass

Bezel ring
Cam ring (bayonet type), stainless steel

Mounting by means of:
Stem mounting
Mounting bracket for wall or pipe mounting (option)
Mounting flange (option)