STEP 1 Determine gas and materials compatibility

Material compatibility between the gas being used and the materials of construction of the regulator is essential. Regulator components that come in contact with the gas stream called "wetted surfaces" must be compatible with the gas being used. Depending on the environment the regulator is being operated in, external materials of construction must be considered as well. Smith Equipment manufactures a wide variety of regulators from various materials to meet most any application. For more information on materials compatibility please refer to the "Material Compatibility Reference" located below.

Types of inlet connections (CGA connections) are determined by the type of gas being used. You can determine what CGA connection you need by locating the gas you will be using in the "Regulator CGA Connections guide located below.

STEP 2 Determine gas purity needs

The higher the purity grade of gas selected, the more "diffusion resistant" the system components need to be. Maintaining gas stream purity is directly related to the materials of construction in the equipment selected. For example when high purity gas is required, regulators with non-stainless steel diaphragms should not be used. Elastomeric (rubber based) diaphragms tend to absorb and outgas which may compromise the gas purity. Regulators with stainless steel metal to metal diaphragms prevent particulates from being absorbed and later diffused into the gas stream maintaining gas purity. To define the grade of regulator purity required, consider the following as a guide:

GENERAL PURPOSE REGULATORS- Are recommended for use with non-corrosive and non-hazardous pure and mixed gas applications where elastomeric outgassing is not critical. These regulators are not recommend for analytical or high purity applications. Typical applications included general laboratory or plant use. These regulators contain a self resetting safety relief valve vented to atmosphere to protect downstream equipment from over-pressurization and are available with optional needle valves.

HIGH PURITY ANALYTICAL REGULATORS- Are recommended for use with non-corrosive pure and mixed gas application. Typical applications include gas management of analytical instrumentation, chromatographic carrier gas, and process gas regulation. These units minimize outgassing and inboard diffusion through the use of stainless steel convoluted diaphragms and high purity seats and seal rings. These regulators contain a self resetting safety relief valve vented to atmosphere to protect downstream equipment from over-pressurization and are available with optional needle valves.

HIGH PURITY REGULATORS- Are recommended for use with non-corrosive pure and mixed gas application. Typical applications include gas management of analytical instrumentation, chromatographic carrier gas, and process gas regulation. These units minimize outgassing and inboard diffusion through the use of stainless steel convoluted diaphragms, high purity seats and seal rings. These regulators may be fitted with optional captured safety relief vents to safely vent away hazardous gasses and protect downstream equipment from over-pressurization in the event the diaphragm failures. Optional packless diaphragm valves are also available for these regulators.

HIGH PURITY CORROSION RESISTANT REGULATORS- Are recommended for use with mildly corrosive and non-corrosive gas applications. The stainless steel convoluted metal to metal diaphragm seal provides superior leak performance and eliminates the need for seal rings. The metal to metal seal eliminates outgassing and inboard diffusion in the gas stream. These regulators may be fitted with optional captured relief vents to safely vent away hazardous gasses and protect downstream equipment from over-pressurization in the event of a diaphragm failure. Optional packless diaphragm valves are also available for these regulators.

DELUXE CORROSION REGULATORS- Are recommended to control the pressure of highly corrosive and reactive gasses. All wetted surfaces of the deluxe corrosive service regulators are constructed of Monel, Inconel or PCTFE materials and are protected by two sintered Monel filters. These regulators are recommended for use with halogen gases.

STEP 3 Determine delivery pressure needs

Single stage regulators reduce pressure by passing through one pressure reducing valve area in a single step to deliver a pressure within a specific range. Regulators designed in this way will show a slight increase in delivery pressure as the cylinder pressure falls during use. This phenomenon is known as decay/rise. This reduced inlet pressure provides less force against the regulator valve causing it to open wider resulting in increased pressure. If constant pressure is required, periodic adjustment of the regulator is required as the cylinder pressure is reduced. Two stage or dual stage regulators perform the same function as single stage regulators however; they are actually two regulators in the same housing. In two stage regulators delivery pressure remains constant as the cylinder pressure decreases. Greater accuracy in pressure control is maintained because the pressure is reduced by passing through two pressure reducing valves instead of one. The first stage reduces the incoming high pressure down from 3,000 psi to around 200-300 psi. The second stage is adjustable and reduces the remaining pressure down to the desired working pressure. Because the inlet pressure on the second stage is relatively stable from the first stage, two stage regulators maintain stable delivery pressure and do not require periodic adjustment as the cylinder pressure decreases.

In summary a single stage regulator will automatically increase outlet pressure as the cylinder pressure drops. A two stage regulator outlet pressure will remain constant when the cylinder pressure drops.

STEP 4 Determine outlet fitting requirements

Specific outlet connections are determined by the gasses used as well as application and down stream requirements. Most regulators are available with or without outlet fittings and are configured at the time of ordering. Smith Equipment offers a wide variety of outlet fittings including standard hose fittings, needle valves, diaphragm valves, and tube fittings. Refer to the available options shown on the catalog page for the specific regulator chosen. Other options and accessories are also available as listed on specific regulator pages.





 
Materials of Construction
 
Body
Diaphragm
Regulator
Series
Application
Stainless
Steel
Electroless
Nickel
Plated
Brass
Monel
Neoprene
Stainless
Steel
Stainless
Steel
w/ O-Ring
Seals
Piston
Monel
Single
Stage
Two
Stage
Line
Other
100 Series
General Purpose
 
X
 
X
           
X
 
110 Series
General Purpose
 
X
 
X
       
X
     
120 Series
General Purpose
 
X
 
X
         
X
   
200 Series
High Purity Analytical
 
X
     
X
       
X
 
210 Series
High Purity Analytical
 
X
     
X
   
X
     
220 Series
High Purity Analytical
 
X
     
X
     
X
   
250 Series
High Purity Analytical
 
X
     
X
   
X
   
Rear Entry
300 Series
High Purity Corrosion Resistant
X
     
X
         
X
 
310 Series
High Purity Corrosion Resistant
X
     
X
     
X
     
320 Series
High Purity Corrosion Resistant
X
     
X
       
X
   
420 Series
General Purpose
 
X
 
X
       
X
    Lecture Bottle
520 Series
General Purpose
 
X
     
X
   
X
    Lecture Bottle
600 Series
High Purity
 
X
   
X
         
X
 
610 Series
High Purity
 
X
   
X
     
X
     
620 Series
High Purity
 
X
   
X
     
X
     
630 Series
High Purity Analytical
 
X
   
X
 
X
     
X
Piston
700 Series
Deluxe Corrosion
   
X
       
X
 
X
   
820 Series
High Pressure
 
X
       
X
 
X
    Piston




The following information is provided as a guide to assist you in determining which regulator should be used for a given application. It should be noted however, that this information is based on SMITH EQUIPMENT’S experience to date and is believed to be reliable. These applications are only suggestions by SMITH EQUIPMENT and the user accepts full responsibility for their use and does so at his own discretion and risk.

SMITH EQUIPMENT strongly recommends that tests be run under actual operating conditions to determine the regulator’s performance and compatibility with the gas to be used.


Pure Gases
Line Regulator
Cylinder Regulator
Single Stage
Single Stage
Two Stage
CGA Inlet
Acetylene
      Atomic absorption 99.6%
HP200 HP210 HP220 510
Air
     Dry
      Hydrocarbon Free
      Zero
GP100
HP600/200
HP600/200
GP110
HP610/210
HP610/510
GP120
HP620/220
HP620/220
590/346
590/346
590/346
Ammonia
      Anhydrous
HP300 HP310 HP320 240/705
Argon
     Research 99.9995%
      U.H.P. 99.999%
      Prepurified 99.998%
      Zero 99.998%
      High Purity 99.995%
HP600/200
HP600/200
HP600/200
HP600/200
HP600/200
HP610/210
HP610/210
HP610/210
HP610/210
HP610/510
HP620/220
HP620/220
HP620/220
HP620/220
HP620/220
580
580
580
580
580
Boron Trifluoride
      Minimum Purity 99.5%
HP300 HP310 HP320 330
1.3 Butadiene
     Instrument 99.5%
      C.P. 99.0%
GP100
GP100
GP110
GP110
GP120
GP120
510
510
N-Butane
     Research 99.9%
      C.P. 99.0%
GP100
GP100
GP110
GP110
GP120
GP120
510
510
Carbon Dioxide
     Research 99.998%
      Instrument (Coleman) 99.99%
      C.P. 99.8%
HP600/200
HP600/200
GP100
HP610/210
HP610/210
GP110
HP620/220
HP620/220
GP120
320
320
320
Carbon Monoxide
     Ultra High Purity 99.9%
      C.P. 99.0%
      Commerical 98.0%
HP600/200
HP600/200
GP100
HP610/210
HP610/210
GP110
HP620/220
HP620/220
GP120
350
350
350
Chlorine
      High Purity 99.5%
HP300 HP310 HP320 660
Deuterium
      C.P. 99.5%
HP600/200 HP610/210 HP620/220 350
Dimethyl Ether
      Purity 99.5%
GP100 GP110 GP120 510
Ethane
     Research 99.98%
      C.P. 99.0%
      Technical 97.5%
None
None
None
HP610/210
HP610/210
GP110
HP620/220
HP620/220
GP120
350
Ethylene
     Research 99.98%
      C.P. 99.5%
      Technical 98.55%
None
None
None
HP610/210
HP610/210
GP110
HP620/220
HP620/220
GP120
350
Helium
     Research 99.9995%
      Ultra High 99.999%
      Zero 99.995%
      High Purity 99.995%
HP600/200
HP600/200
HP600/200
HP600/200
HP610/210
HP610/210
HP610/210
HP610/210
HP620/220
HP620/220
HP620/220
HP620/220
580
580
580
580
Hydrogen
     Research 99.9999%
      Ultra High 99.999%
      Zero 99.99%
      Prepurified 99.99%
      Extra Dry 99.95%
HP600/200
HP600/200
HP600/200
HP600/200
HP600/200
HP610/210
HP610/210
HP610/210
HP610/210
HP610/210
HP620/220
HP620/220
HP620/220
HP620/220
HP620/220
350
350
350
350
350
Hydrogen Chloride
      Chemical 99.0%
HP300 HP310 HP320 330
Krypton
      Research 99.995%
HP600/200 HP610/210 HP620/220 580
Methane
     Research 99.99%
      U.H.P. 99.97%
      C.P. 99.0%
      Technical 98.0%
      Commerical 93.0%
HP600/200
HP600/200
HP600/200
GP100
GP100
HP610/210
HP610/210
HP610/210
GP110
GP110
HP620/220
HP620/220
HP620/220
GP120
GP120
350
350
350
350
350
Neon
     Research 99.995%
      U.H.P. 99.996%
      Purified 99.89%
HP600/200
HP600/200
HP600/200
HP610/210
HP610/210
HP610/210
HP620/220
HP620/220
HP620/220
580
580
580
Nitrogen
     Research 99.9995%
      Ultra High 99.999%
      Prepurified 99.998%
      Zero 99.98%
      High Purity 99.99%
      Oxygen Free 99.99%
      Extra Dry 99.7%
HP600/200
HP600/200
HP600/200
HP600/200
HP600/200
HP600/200
HP610/210
HP610/210
HP610/210
HP610/210
HP610/210
HP610/210
HP620/220
HP620/220
HP620/220
HP620/220
HP620/220
HP620/220
580
580
580
580
580
580
Nitrous Oxide
     U.H.P. 99.99%
      Atomic Absorption 99.0%
HP600/200
GP100
HP610/210
GP110
HP620/220
GP120
326
326
Oxygen
     Research 99.9995%
      U.H.P. 99.99%
      Zero 99.6%
      Extra Dry 99.6%
HP600/200
HP600/200
HP600/200
HP600/200
HP610/210
HP610/210
HP610/210
HP610/210
HP620/220
HP620/220
HP620/220
HP620/220
540
540
540
540
Propane
     Research 99.99%
      Instrument 99.5%
      C.P. 99.0%
      Natural 96.0%
HP200
GP100
GP100
GP100
HP210
GP110
GP110
GP110
HP220
GP120
GP120
GP120
510
510
510
510
Propylene
     Research
      C.P. 99.0%
HP200
GP100
HP210
GP210
HP220
GP220
510
510
Sulfur Hexafluoride
     Instrument 99.99%
      C.P. 99.8%
HP600/200
GP100
HP610/210
GP110
HP620/220
GP120
590
590
Xenon
     Research 99.995%
HP600/200 HP610/210 HP320/220 580



Mixed Gases
Line Regulator
Cylinder Regulator
Single Stage
Single Stage
Two Stage
CGA Inlet
Ammonia
     in Argon
      in Helium
      in Hydrogen
      in Nitrogen
HP300
HP300
HP300
HP300
HP310
HP310
HP310
HP310
HP320
HP320
HP320
HP320
705
705
705
705
Argon
     in Helium
      in Hydrogen
      in Nitrogen
      in Oxygen
HP600/200
HP600/200
HP600/200
HP600/200
HP610/210
HP610/210
HP610/210
HP610/210
HP620/220
HP620/220
HP620/220
HP620/220
580
580
580
580
Butane
     in Helium
      in Hydrogen
      in Nitrogen
      in Argon
HP600/200
HP600/200
HP600/200
HP600/200
HP610/210
HP610/210
HP610/210
HP610/210
HP620/220
HP620/220
HP620/220
HP620/220
350
350
350
350
Carbon Dioxide
     in Air
      in Argon
      in Helium
      in Hydrogen
      in Nitrogen
      in Oxygen
HP600/200
HP600/200
HP600/200
HP600/200
HP600/200
HP600/200
HP610/210
HP610/210
HP610/210
HP610/210
HP610/210
HP610/210
HP620/220
HP620/220
HP620/220
HP620/220
HP620/220
HP620/220
580
580
580
350
580
296
Carbon Monoxide
     in Air
      in Argon
      in Helium
      in Hydrogen
      in Nitrogen
HP600/200
HP600/200
HP600/200
HP600/200
HP600/200
HP610/210
HP610/210
HP610/210
HP610/210
HP610/210
HP620/220
HP620/220
HP620/220
HP620/220
HP620/220
590
350
350
350
350
Chlorine
      in Argon
      in Helium
      in Nitrogen
HP300
HP300
HP300
HP310
HP310
HP310
HP320
HP320
HP320
330
330
330
Ethane
     in Argon
      Helium
      Hydrogen
      Nitrogen
HP600/200
HP600/200
HP600/200
HP600/200
HP610/210
HP610/210
HP610/210
HP610/210
HP620/220
HP620/220
HP620/220
HP620/220
350
350
350
350
Ethylene
     in Argon
      Helium
      Nitrogen
HP600/200
HP600/200
HP600/200
HP610/210
HP610/210
HP610/210
HP620/220
HP620/220
HP620/220
350
350
350
Helium
     in Argon
      in Hydrogen
      Nitrogen
      in Oxygen
HP600/200
HP600/200
HP600/200
HP600/200
HP610/210
HP610/210
HP610/210
HP610/210
HP620/220
HP620/220
HP620/220
HP620/220
580
350
580
296
Hexan
     in Air
      in ArgonCCCCCC
      in Helium
      Nitrogen
      in Nitrogen
HP600/200
HP600/200
HP600/200
HP600/200
HP600/200
HP610/210
HP610/210
HP610/210
HP610/210
HP610/210
HP620/220
HP620/220
HP620/220
HP620/220
HP620/220
350
350
350
350
350
Hydrogen
     in Argon
      in Helium
      in Nitrogen
HP600/200
HP600/200
HP600/200
HP610/210
HP610/210
HP610/210
HP620/220
HP620/220
HP620/220
350
350
350
Hydrogen Chloride
      in Argon
      in Helium
      in Nitrogen
HP300
HP300
HP300
HP310
HP310
HP310
HP320
HP320
HP320
330
330
330
Hydrogen Sulfide
      in Argon
      in Helium
      in Nitrogen
HP300
HP300
HP300
HP310
HP310
HP310
HP320
HP320
HP320
330
330
330
Isobutane
      in Argon
      in Helium
      in Hydrogen
      in Nitrogen
HP600/200
HP600/200
HP600/200
HP600/200
HP610/210
HP610/210
HP610/210
HP610/210
HP620/220
HP620/220
HP620/220
HP620/220
350
350
350
350
Methane
     in Air
      Argon
      in Helium
      Hydrogen
      Nitrogen
HP600/200
HP600/200
HP600/200
HP600/200
HP600/200
HP610/210
HP610/210
HP610/210
HP610/210
HP610/210
HP620/220
HP620/220
HP620/220
HP620/220
HP620/220
350/590
350
350
350
350
Nitric Oxide
     in Argon
      Helium
      Nitrogen
HP300
HP300
HP300
HP310
HP310
HP310
HP320
HP320
HP320
660
660
660
Nitrogen
     in Argon
      in Hydrogen
      in Helium
      in Oxygen
HP600/200
HP600/200
HP600/200
HP600/200
HP610/210
HP610/210
HP610/210
HP610/210
HP620/220
HP620/220
HP620/220
HP620/220
580
580
350
296
Nitrogen Dioxide
     in Air
      in Argon
      in Helium
      in Nitrogen
HP300
HP300
HP300
HP300
HP310
HP310
HP310
HP310
HP320
HP320
HP320
HP320
660
660
660
660
Oxygen
     in Argon
      in Helium
      in Nitrogen
HP600/200
HP600/200
HP600/200
HP610/210
HP610/210
HP610/210
HP620/220
HP620/220
HP620/220
590 / 296
590 / 296
590/ 296
Propane
     in Air
      in Argon
      in Helium
      in Hydrogen
      in Nitrogen
HP600/200
HP600/200
HP600/200
HP600/200
HP600/200
HP610/210
HP610/210
HP610/210
HP610/210
HP610/210
HP620/220
HP620/220
HP620/220
HP620/220
HP620/220
590
350
350
350
350
Propylene
     in Air
      in Argon
      in Helium
      in Hydrogen
      in Nitrogen
HP600/200
HP600/200
HP600/200
HP600/200
HP600/200
HP610/210
HP610/210
HP610/210
HP610/210
HP620/220
HP620/220
HP620/220
HP620/220
590
350
350
350
350
Sulfur Dioxide
     in Air
      in Argon
      in Helium
      in Nitrogen
HP300
HP300
HP300
HP300
HP310
HP310
HP310
HP310
HP320
HP320
HP320
HP320
660
660
660
660



Instrument Mixtures
Line Regulator
Cylinder Regulator
Single Stage
Single Stage
Two Stage
CGA Inlet
CHROMATOGRAPH CARRIER GAS
     8.5% Hydrogen
      91.5% Helium
HP600 / 200 HP610 / 210 HP620 / 220 350
ELECTRON CAPTURE MIXTURE
     P-5 Gas Mixture
      5% Methan
HP600 / 200 HP610 / 210 HP620 / 220 350
FLAME IONIZATION FUEL MIXTURES
     40% Hydrogen
      60% Helium
HP600 / 200 HP610 / 210 HP620 / 220 350
FURNACE ATMOSPHERE MIXTURES
     40% Carbon Dioxide
      60% Carbon Monoxide
HP600 / 200 HP610 / 210 HP620 / 220 350
GEIGER GAS MIXTURE
     .95% ISO Butane
      99.05% Helium
HP600 / 200 HP610 / 210 HP620 / 220 350
LEAK D ETECTION MIXTURE
      1 - 10% Helium in Nitrogen
HP600 / 200 HP610 / 210 HP620 / 220 580



Nuclear Counter Mixtures
Line Regulator
Cylinder Regulator
Single Stage
Single Stage
Two Stage
CGA Inlet
P-10 Gas Mixture
     10% Methane
      90% Argon
HP600 / 200 HP610 / 210 HP620 / 220 350
Proportional Counting Mixture
     4% ISO Butane
      96% Helium
HP600 / 200 HP610 / 210 HP620 / 220 350
Proportional Counting Mixture
     1.5% ISO Butane
      98.5% Helium
HP600 / 200 HP610 / 210 HP620 / 220 350



Auto Emission Test Gases
Line Regulator
Cylinder Regulator
Single Stage
Single Stage
Two Stage
CGA Inlet
 1 - 8% Carbon Monoxide 500 - 5,000 ppm Propane in Nitrogen None HP610 HP620 / 220 350
 1 - 8% Carbon Monoxide
 10 - 20% Carbon Dioxide
500 - 5,000 ppm Propane in Nitrogen
None HP610 HP620 / 220 350
 I/M Field Calibration Gas
1.6% Carbon Monoxide
11.0% Carbon Dioxide
 600 ppm Propane Balance Nitrogen
None HP610 HP620 / 220 350


Laser Gases
Line Regulator
Cylinder Regulator
Single Stage
Single Stage
Two Stage
CGA Inlet
EXCIMER LASER GAS MIXTURES
     Hydrogen Chloride in Helium
HP300 HP310 HP320 330
MOLECULAR LASER GAS MIXTURES
     4.5% Carbon Dioxide
      13.5% in Helium
HP600 / 200 HP610 / 200 HP620 / 220 580



On orders over $200.00.
CONUS, Standard Ground Shipping
Orders may take up to 5 days to ship.
Prices are subject to change.
All products subject to availability.

Last update 1 Jan 2009