Harris products are sold and used in over 85 countries. Harris specialty gas equipment division was founded to provide complete solutions to customer’s special gas handling requirements. The breadth of the product line is used in analytical laboratoraries, chemical processing, research and development, as well as biotechnology and pharmaceuticals. In addition to pressure control equipment, Harris also offers a complete range on gas management products for flow control, gas purification, cylinder storage and audio/visual pressure indication.
Below is only a small percentage of the available range of scientific regulator. Please feel free to browse through the specialty gas equipment catalogue (link below) if our most popular HP 741 or HP 742 do not suit your specific applicaiton.
HIGH PURITY PRESSURE REGULATOR SELECTION
Gases can be supplied in compressed gas high-pressure cylinders, liquid low-pressure cylinders or from low-pressure pipeline supply. The pressure from the supply source must be reduced to the desired working pressure for the application, to accomplish this a pressure reducing valve commonly referred to a regulator needs to be selected. Proper selection is critical for a safe and effective transfer of the gas from the gas supply to the instrument. Regulators are designed to control pressure. Regulators will not measure or control flow. An external device such as a flow-meter or metering valve specifically designed for flow control should be used for that purpose.
Selection of the correct regulator involves many variables. All items must be considered in making the proper regulator selection.
MATERIAL COMPATIBILITY
Materials used to construct the pressure regulator need to be compatible with the intended gas service. All the wetted areas (parts of the regulator in contact with the gas) must be selected to avoid any reaction with the gas that can cause contamination in the gas stream or deterioration of the regulator components. Refer to Gas Materials Compatibility Table.
INLET PRESSURE RATING
Inlet pressures can range from low pressure in pipeline usage to high pressure from compressed gas cylinders. Regulators used in a pipeline will normally have only one gauge to indicate delivery pressure while a cylinder
regulator will have two gauges; one to show inlet pressure and the other to show delivery pressure. An exception to this would be the use of regulators for liquid gas cylinders. In this application, only the delivery pressure gauge would be required since the supply pressure is generally constant. When selecting the regulator it must be capable of handling the incoming inlet pressure. When the gas is supplied from a cylinder the CGA (Compressed Gas Association) inlet connection number will dictate the maximum supply pressure. This pressure can range from 100 PSI to over 6000 PSI.
DELIVERY PRESSURE RANGE
The desired working pressure for the operation may range from low pressure up to 15 PSIG to a much higher working pressure (7500-PSIG). The regulator selected must be able to supply the proper working pressure consistent with the requirements of the process.
GAS PURITY
Maintaining the purity level of the gas is of primary importance in the selection of the regulator. The selected regulator must be resistant to any introduction of contaminants that can be detrimental to the process. In addition to the proper selection of materials for gas compatibility, the design, assembly and testing of the regulator are critical items to consider in the selection process. Clean room assembly and Helium leak testing are common procedures used to insure the integrity of the regulator.
REGULATION, SINGLE OR TWO STAGE
Single-Stage regulators are best suited for applications where manual periodic adjustment of the delivery pressure settings is not a problem and the inlet pressure remains constant, such as the case in gas withdrawal from liquid cylinders.
Two-stage regulators are two regulators built into a single regulator body. The first regulator (first stage) is preset at a non-adjustable pressure to reduce the incoming pressure to a lower pressure referred to as the intermediate stage. The second regulator (second stage) is adjustable within the desired delivery range. The two-stage regulator allows for steady delivery pressure without periodic adjustment, well suited for applications requiring constant pressure from full to nearly empty cylinder.
HP 741: HIGH PURITY STAINLESS STEEL REGULATOR
Model HP 741 is a single stage stainless steel cylinder regulator
for applications where a slight rise in delivery pressure from full to
empty cylinder can be tolerated. The Model HP 741 is suitable for:
– Corrosive gas applications
– High purity gas applications
– Research sample systems gases
– Process analyzer gases
– Gas chromatography
– EPA protocol gases
– Laser gas systems
– Emission monitoring systems
Recommended for corrosive gases or purity levels of
Grade 6.0 (99.9999) and higher.
FEATURES
– 1 11/16” 316L stainless steel diaphragm
eliminates contamination from diffusion or outgassing
– One piece encapsulated seat design includes a
sintered filter to protect the seat from particulate
contamination
– Chrome plated bonnet, 316L SS body and fittings
– 2” stainless steel dual scale gauges (psi/bar)
– 1 x 10-9 cc/sec. inboard helium leak rate to maintain
gas purity levels
– Front or back panel mountable
– Maximum inlet 3000 PSIG except for models with
– CGA 240, 300 and 510 equipped with 400
PSIG inlet gauge
HP 742: HIGH PURITY STAINLESS STEEL REGULATOR
Model HP 742 is a two stage stainless steel cylinder regulator for constant delivery pressure from full to near empty cylinder
conditions. The HP 742 is suitable for:
– Corrosive gas applications
– High purity gas applications
– Research sample systems gases
– Process analyzer gases
– Gas chromatography
– EPA protocol gases
– Laser gas systems
– Emission monitoring systems
Recommended for corrosive gases or purity levels of
Grade 6.0 (99.9999) and higher.
FEATURES:
– 1 11/16” 316L stainless steel diaphragm eliminates contamination from diffusion or outgassing
– One piece encapsulated seat design includes a sintered filter to protect the seat from particulate contamination
– Chrome plated bonnet, 316L SS body and fittings
– 2” stainless steel dual scale gauges (psi/bar)
– Designed to 1 x 10-9 cc/sec. inboard helium leak rate to maintain
gas purity levels
– Maximum inlet 3000 PSIG except for models with CGA
240, 300 and 510 equipped with 400 PSIG inlet gauge
– Front panel mountable
HARRIS SPECIALTY GAS EQUIPMENT FULL CATALOGUE
Open the latest Catalogue from Harris. This is a comprehensive document that includes pressure control equipment, gas managment products, gas purification and cylinder storage solutions.