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Ashcroft   Pressure Element Selection
Media Application
The Media being measured must be campatible with the wetted parts of the pressure instrument. To use the chart below, locate the media whose pressure is to be measured an select a suitable material from those available. This is a   simplified chart and assumes the media temperature is below 200°F except for media with a "*" which must be elow 100°F. Throttling devices and/or a liquid-filled instrument are recommended in applications with pulsation or vibration.   These recommendations are only a guide, as service life is dependent on temperature, concentrations, catalysts that may be added, or other conditions beyond our control. Consult factory for specific applications and for any services not listed.

Pressure Instrument
Material
Media Application Brass or Bronze Steel 316SS Monel Diaphragm Seals**
Acetone* ·   · ·  
Acetic Acid <40%     ·    
Acetic Anhydride         ·
Acetylene (Dry)   · ·    
Acrolein 100%         ·
Air · · · ·  
Alcohol, Ethyl ·   · ·  
Alum. Chloride >10%         ·
Alum. Sulfate 10-50%         ·
Ammonia Gas (Dry)   · ·    
Ammonium Chloride <40%         ·
Ammonium Nitrate <50%     ·    
Ammonium Sulfate <60%         ·
Aniline >99%     ·    
Argon · · · ·  
Beer     ·    
Benzedine >99%         ·
Benzene <50%     · ·  
Benzoic Acid <70%     ·    
Boric Acid <25%     ·    
Bromine (Dry)         ·
Butane · · · ·  
Butyric Acid <10%     ·    
Calcium Chloride <80%         ·
Calcium Hydroxide <50%         ·
Carbon Dioxide · · · ·  
Carbon Monoxide >99% · · · ·  
Chlorine (Dry)         ·
Chlorine (Moist)*         ·
Chloroform (Dry)     · ·  
Chromic Acid         ·
Citric Acid 10-50%     ·    
Corn Oil     ·    
Crude Oil (Sour)       ·  
Pressure Instrument
Material
Media Application Brass or Bronze Steel 316SS Monel Diaphragm Seals**
Crude Oil (Sweet)     · ·  
Ethyl Acetate ·   · ·  
Ethylene Oxide >99% ·   · ·  
Ferric Chloride <40%         ·
Ferric Sulfate <10%     ·    
Ferrous Chloride <30%         ·
Ferrous Sulfate <50%         ·
Flourine Gas (Dry)       ·  
Formaldehyde <95%     · ·  
Formic Acid*         ·
Freons   · ·    
Furfural <10%         ·
Gasoline (Flowing) ·   ·    
Glycerin >99% · · · ·  
Hydrobromic Acid         ·
Hydrochloric Acid         ·
Hydrofluoric Acid         ·
Hydrofluosilic Acid         ·
Hydrogen (1) ·   ·    
Hydrogen Peroxide <50%         ·
Kerosene · · · ·  
Lactic Acid <70%* (1)     ·    
Magnesium Chloride         ·
Mercury >99%     ·    
Milk     ·    
Naphtha >99% · · · ·  
Naphthalene >99%     ·    
Nickel Chloride >99%         ·
Nitric Acid <95%     ·    
Nitrogen · · · ·  
Oleic Acid ·   ·    
Oxalic Acid*         ·
Oxygen (Gas) (2) ·   · ·  
Palmitic Acid >99%     ·    
Pressure Instrument
Material
Media Application Brass or Bronze Steel 316SS Monel Diaphragm Seals**
Phosphoric Acid <80%*     ·    
Picric Acid     ·    
Propane (Dry)   · · ·  
Sea Water (Flowing)       ·  
Silver Nitrate <70%         ·
Sodium Bicarbonate <20%     · ·  
Sodium Bisulfate <30%         ·
Sodium Carbonate <40%       ·  
Sodium Chromate <60% · · · ·  
Sodium Cyanide*   · ·    
Sodium Hydroxide <40%       ·  
Sodium Hypochlorite <25%         ·
Sodium Phosphate, Tri <60%   · · ·  
Sodium Silicate <50%   · · ·  
Sodium Sulfide <50%         ·
Stannous Chloride <10%     ·    
Steam (use siphon) · · · ·  
Stearic Acid     · ·  
Sulfur Dioxide (Dry) <99%         ·
Sulfur Trioxide (Dry) <99%         ·
Sulfuric Acid         ·
Tannic Acid <80% · · · ·  
Tartaric Acid <50%     · ·  
Tin Chloride (ous) <10%     ·    
Touene >99% · · · ·  
Turpentine >98% ·   · ·  
Water ·   · ·  
Whiskey     ·    
Zinc Chloride <25%         ·
Zinc Sulfate <40%         ·


(1) Over 1000 psi - entire system must be 316 stainless steel.

(2) Bronze, Monel and 316 stainless steel are acceptable for oxygen service, provided the instrument has been cleaned for service and is freom from oil.		 * Media temperature must be below 100 °F.
**Any standard bourdon tube or bellows material may be used in conjunction with a diaphragm seal (with bellows use a Viton or Kalrez diaphragm), but the gauge selection should take into consideration the corrosive environment in which it is to operate.

Click here to download a more complete Corrosion Data Guide.


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