232.53AM 233.53AM Refrigeration Ammonia Bourdon Tube Pressure Gauges


  • Measuring refrigerant ammonia pressure and temperature
  • Suitable for corrosive environments and gaseous or liquid media that will not obstruct the pressure system
  • Process industry: chemical/petrochemical, power stations, mining, on and offshore, environmental technology, mechanical engineering and plant construction

Product features

  • Excellent load-cycle stability and shock resistance
  • All stainless steel construction
  • Ammonia refrigerant scales on dial

Application Datasheet – Fill Out and Return for Most Accurate Quote


ASME B40.100 & EN 837-1

2½” & 4” (63 and 100 mm)

Accuracy class
2½”: ± 2/1/2% of span (ASME B40.100 Grade A)
4”: ± 1.0% of span (ASME B40.100 Grade 1A)

30”Hg / 0 / 150 psi (84°F)
30”Hg / 0 / 300 psi (126°F)

Working pressure
2½”: Steady: 3/4 scale value
Fluctuating: 2/3 full scale value
Short time: full scale value

4 ”: Steady: full scale value
Fluctuating: 0.9 x full scale value
Short time: 1.3 x full scale value

Operating temperature
Ambient: -40°F to +140°F (-40°C to +60°C) – dry
-4°F to +140°F (-20°C to +60°C) – glycerine filled
-40°F to +140°F (-40°C to +60°C) – silicone filled
Medium: +212°F (+100°C)

Temperature error
Additional error when temperature changes from reference temperature of 68°F (20°C) ±0.4% of span for every 18°F (10°K) rising or falling.

Weather protection
Weather tight (NEMA 4X / IP66)

Pressure connection
Material: 316L stainless steel
1/4” NPT, lower mount (LM)

Bourdon tube
Material: 316L stainless steel

Stainless steel

White aluminum with black lettering, 2½” with stop pin

Black aluminum