AST manufactures pressure transducers, transmitters, and switches for hazardous locations, including explosion-proof, non-incendive and intrinsically safe areas. These three classifications each have their own unique product lines to support their applications, yet share the same leading sensor technologies to meet various challenges associated with hazardous areas. From 1 PSI to 20,000 PSI, AST has a pressure sensing product that can be manufactured to your needs.
The AST4600 and AST46HA pressure transmitters currently support explosion-proof requirements for the Energy, Oil and Gas industries. Explosion-proof transmitters are available as factory sealed (non-vented) for pressure ranges above 500 PSI, which will not allow the hazardous atmosphere to penetrate the sensor or any environmental conditions such rain or snow to affect performance. For lower pressure ranges, AST manufactures ex-proof transmitters vented to atmosphere, for high accuracy readings.
AST46HA Explosion-Proof Pressure Transmitter
AST has developed the AST46DS for explosion-proof applications that require a local display, push-button zero capability and low current consumption. With pressure ranges from 1 to 20,000 PSI, the AST46DS pressure transducer is a cost-effective choice for a wide range of on and offshore applications.
The most popular output signals are 4-20mA and 1-5V. 4-20mA is a common output signal that is usable with most modern PLC's. It can also travel long distances. A 1-5V output signal offers the benefit of lower current consumption. For applications that are powered by a solar panel in a remote site, 1-5V output signals help preserve the battery to ensure continuous operation.
The AST46SW is an explosion-proof SPDT pressure switch with system pressure capability up to 20,000 PSI. The compact design, sensing technology, and competitive pricing make the AST46SW an ideal fit for on and off-shore applications.
For differential pressure transducer applications requiring explosion proof ratings, AST manufactures the AST5300 explosion-proof differential pressure transmitter. Capable of extremely high line pressure with a 5 or 10 PSID differential pressure measurement range, this is a very accurate DP over a wide temperature range using the latest in LVDT technology. The AST54ED differential pressure transducer is manufactured to handle line pressures up to 5,000 PSI for hydraulic systems and filtration monitoring in explosion proof areas.
AST currently offers three products for non-incendive applications: AST4300, AST43LP and AST54EN. These products will need conduit installed over the cable or into the DIN43650A mating connector, with the exception of the Mini-Fast electrical connection. When ordered with CSA certification, customers can purchase the AST4300, AST43LP or AST54EN with a Mini-Fast connection, lock out device and certified cable assembly that does not require conduit.
The AST4300 pressure transmitter is the standard offering. It is available with pressure ranges from -14.7 to 20,000 PSI. Options such as sealed gauge and heavier gauge wire are available within this product family.
The AST43LP product was added to the product line in order to offer low pressure measurements to the AST customer base. With pressure ranges of 0-1 to 15 PSIG, the AST43LP completes the non-incendive product family. Available with bi-directional measurement ranges, it is ideal for vapor recovery applications.
The AST54EN differential pressure transducer is a simple, cost effective solution for monitoring differential pressure in Class I Div 2 environments. From CNG Compressor filters and dryers to hydraulic filtration systems, the AST54EN is an accurate, reliable solution that offers higher performance than two independent transmitters with lower costs than traditional process instrumentation.
The Intrinsically Safe rating currently covers five AST products. Approvals cover UL, CSA, ATEX and IECEx approvals.
The AST4400, AST4401 and AST44LP series offer the same features and benefits as the AST43xx family with two exceptions. Rather than the requirement to install a conduit over a cable, intrinsically safe transmitters need the sensor installed with an approved barrier. Non-Incendive products offer the cost savings of no barrier requirement, where as intrinsically safe products offer flexibility in the electrical connection options, including cable or DIN, Bendix and the M12x1 connectors. The AST4401 series offers approval for Groups A, B, C, and D with a supply voltage of 10-15.5VDC whereas the AST4400 and AST44LP are approved for Groups C and D with a supply maximum of 28VDC.
AST also offers submersible level sensors with Intrinsically safe ratings. The AST4500 is primarily used for deep well applications, with pressure ranges above 15 PSI. The AST4510 is commonly installed for tank level monitoring for pressure ranges from 0-1 to 15 PSIG. The AST4520 series is used for monitoring level of viscous media in areas such as waste water treatment plants and ship tanks. The AST4530 PVDF / PTFE submersible pressure transducer is becoming a popular product for liquid level monitoring in corrosive liquids and gases where stainless steel, ultrasonic or radar level devices cannot survive.
CSA File Number: 212120 & UL Numbers: E214980 & E210825
Single Seal Approval
All hazardous location products are available with CSA Single Seal Approval. Under ANSI 12.27.01-2003, pressure instrumentation in Canada requires a single seal or dual seal approval. Dual Seal devices require a secondary device to protect against a rupture of the transmitter's diaphragm. Single Seal pressure transmitters do not require a secondary device. To achieve the approval, AST's pressure sensors were tested to withstand the burst pressure requirements by CSA.