Product category:
Pressure measurement systems
News Release from: American Sensor Technologies | Subject: AST4600
Edited by the Processingtalk Editorial
Team on 25 October 2007
'Single Seal' CSA tested pressure
transmitters
American Sensor Technologies announces single seal compliance to ANSI/ISA 12.27.01-2003 for their AST4600 Explosion-proof pressure transmitter series
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, according to data on the ISA website The AST4600 is now designed to withstand the a burst pressure test with the following characteristics
This article was originally published on Processingtalk on 19 Aug 2004 at 8.00am (UK)
Related stories
Pressure sensor is safe for hydrogen service
The Model AST 4600 explosion-proof pressure sensor is ideal for use in hydrogen service and other hazardous applications.
Wet/wet DP sensors for corrosive conditions
AST wet/wet DP sensors are designed for use in water management, gas pipeline instrumentation, filtration, natural gas compressors and applications where corrosive liquids and gases are present
Maximum working pressure up to 14 MPa, Burst test pressure 3xPmax.
Maximum working pressure 14 Mpa < Pmax < 70 MPa, Burst test pressure 2.5xPmax + 7MPa.
Maximum working pressure greater than 70MPa, Burst test pressure 2xPmax + 42MPa.
Tested by the Canadian Standards Association (CSA), all AST4600 pressure sensors will now be engraved with the 'Single Seal' marking to indicate compliance with this pressure characteristic.
The housing will include the ambient (-40 to 85C) and process (-40C to 125C) 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 saving and is much more compact than dual seal devices.
AST4600s offer the added benefit of Krystal Bond 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 from 1 October 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 website, or contact the factory direct.
• American Sensor Technologies: contact details and other news
• Email this article to a colleague
• Register for the free Processingtalk email newsletter
• Processingtalk Home Page
Search the Pro-Talk network of sites
