October 30, 2007 (PRLEAP.COM) Technology News
American Sensor Technologies, Inc announces its compliance to ANSI/ISA 12.27.01-2003 for their AST4600 Explosionproof Pressure Transmitter.
ANSI/ISA - 12.27.01-2003 “provides specific requirements for process sealing between electrical systems and flammable or combustible process fluids where a failure could allow the migration of process fluids directly into the electrical system.

Examples of this type of seal include diaphragm seals, thermowells, and pump seals.” (*

The AST4600 will withstand the following burst pressure test; please refer to chart.

P max < 14 MPa 3x Pmax
14 Mpa < Pmax < 70 MPa 2.5x Pmax + 7 MPa
70 MPa < Pmax 2x Pmax + 42 MPa

Tested by the Canadian Standards Association (CSA), all AST4600 pressure sensors will now be engraved with the Single Seal marking to indicate compliance. The housing will include the ambient (-40° to 85°C) and process (-40̊ to 125̊C) temperature range information, along with the CSA 30 Class 1 Division 1 Explosionproof [Groups A, B, C, D] approval marking. A single seal pressure sensor has a significant cost savings and is much more compact than dual seal devices. AST4600s offer the added benefit of Krystal Bondä Technology, allowing pressure measurement through a solid piece of stainless steel [no welds, oil-filled cavities, or internal O-rings].

The approval most notably effects equipment subjected to inspection by mechanical, electrical, and instrumentation inspectors in Canada. Effective October 1, 2007, sensors on new or repaired equipment must be marked as a "Single Seal" or "Dual Seal" device in order to continue operation.
For more information, please refer to our web site at or contact the factory directly at

About AST
AST manufactures state-of-the-art, MEMS-based pressure sensing products that offer the best price-performance ratio in the industry. Common applications of AST sensor products are in industrial OEM, hydraulic systems, fuel cells, medical gases, HVAC/R, refrigeration (ammonia, Freon, CO2), oil & gas exploration and production, and off-road vehicles. By combining exotic metals and AST’s exclusive, proprietary Krystal Bond™ Technology (an advanced process in which inorganic materials are molecularly diffused onto a metallic surface in the presence of certain gases), AST can produce high-performance strain gauge pressure sensors that support the specialized needs of key niche markets. Many AST products are UL listed as intrinsically safe and certified for explosion-proof required environments. Some of the world’s most highly respected industrial Fortune 500 corporations have tested and now use AST products in a wide range of critical and harsh environments. For more information on AST products and technology, go to AST’s website at