AST Pressure Sensor Blog

Hastelloy C276 Pressure Transducers

Sep 13th 13

American Sensor Technologies, Inc. (AST) manufactures pressure transducers using Hastelloy* C276 material for use with corrosive liquids and gases.  Using both Krystal Bond Technology and LP Technology, AST has a full range of capability from 2.5 PSI up to 10,000 PSI.  The material is a perfect compliment to stainless steel by offering a high yield strength and superior corrosion resistance.  

one piece pressure sensor designWith Krystal Bond Technology, customers receive a monolithic piece of material with no welds, O-rings, or fluid fills.  Bulk silicon strain gages are mounted directly to the top of the metal diaphragm using a special glass firing process.  With high raw output signal, inorganic materials, and a thick diaphragm membrane, users benefit from complete isolation of the pressure to the fitting and long-term stability. 

Applications for Hastelloy pressure transducers include salt water and reverse osmosis systems, chemical tank level monitoring, oil and gas processing equipment, semiconductor processing systems, and more.  The sensor material is available on hazardous and non-hazardous area pressure transducers and available as a gauge pressure transducer or differential pressure transducer. 

Sea Water Pressure Transducer

desalination plant

Measuring sea water is more complicated than a standard residential well water pump.  Depending on the system, the introduction and presence of oxygen can increase corrosion of standard stainless steels.  Scaling from minerals can also lead to the long-term break down of standard stainless steel pressure transducers.  Microbial organisms can also grow within a system to clog openings and break down material.  
Higher pressures can also increase erosion and speed up the process within a system.  With the diaphragm being the thinnest and most critical piece of a pressure transducer, ensuring it will withstand a long-term installation is critical.   AST uses the thickest Hastelloy diaphragm in the industry for a given pressure to ensure long term use and long-term stability of the sensor’s output signal.

Process Chemical Pressure and Level Management

oil refinery

With the increased use and development of specialty liquids and gases, special attention is being given to the materials used in contact with them.  As such, increased awareness and regulations aide in this process to ensure safety of those individuals around them.

AST pressure transducers are being used in hazardous and non-hazardous locations to monitor the level and/or pressure of such chemicals using Hastelloy C276 (N10276) material.  In the oil production and process industries, NACE MR0175/ISO 15156 and NACE MR0103 allow for the use of Hastelloy C276 with liquids and gases that come in contact with materials that can cause sulfide stress cracking (SSC) or stress cracking corrosion (SCC).  Canadian regulations for piping and fittings in upstream and midstream piping requires provinical registration (Canadian Registration Number - CRN) of sensor fittings and materials under ASME B31.3.

Offering Hastelloy material compliments AST’s other materials that are limited in this environment (316L) or not allowed (17-4 PH).  With the presence of hydrogen sulfide and chlorides in many chemical processes, nickel alloys offer higher survivability than standard stainless steels.  Combined with AST’s sensor technology, the material, diaphragm thickness and low operating strain combine to create an ideal match for long term pressure measurement.

AST has a standard price adder of $100 per transmitter, with quantity discounts available.  Contact AST to help configure your pressure transmitter with the best material option.  Within the AST model matrix, AST utilizes the number "4" to designate Hastelloy material when ordering.  As a resource for chemical compatibility, Cole Parmer offers information on Hastelloy C276.

*Hastelloy is a registered trademark of Haynes International


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