American Sensor Technologies, Inc. is a leading manufacturer of explosion proof transmitters and transducers for Class I and II / Zone 1 environments. Available in pressure ranges from 1 PSI to 20,000 PSI and various outputs, sensor types and pressure ports, the AST family of explosion-proof rated products will fit your performance and pricing requirements.
All AST explosion-proof products share a CSA 30 (UL1203/FM3615) Class I Division 1 Zone 1 Group IIC rating for Groups A, B, C, and D. Each product is also certified to ANSI/ISA 12.27.01-2007 Single Seal as required in the Canadian market. All products are also designed with a factory sealed conduit, including low pressure vented gauge transmitters. Other approvals such as ABS certification for marine and offshore equipment as well as Class II Division 1 approval for mining, are available on select products.
The following table will help you in the selection from the many options available. Please contact AST with any questions in the selection process for assistance.
as low as
|Class II Division 1
E, F, G
above 10,000 PSI
|AST4600 Vented (low pressure)||X||X|
|AST4600 Sealed Gauge (high pressure)||X||X||X||X|
|AST46HA Vented (low pressure / high accuracy)||X||X||X||X|
|AST46HA Sealed Gauge (high pressure / high accuracy)||X||X||X||X||X||X|
|AST46PT Vented (low pressure / temperature)||X||X||X||X|
|AST46PT Sealed Gauge (high pressure / temperature)||X||X||X||X||X||X|
|AST46DS with local display||X||X||X||X|
|AST46SW Pressure Switch||X||X||X|
The top of the diaphragm is "vented" or "open" to atmospheric pressure through the use of a sintered plug. This allows the sensor to adjust for differences in barometric pressure. The plug itself is constructed of small holes that allow pressure through, but do not allow a flame to penetrate. The vent design has been tested and certified by CSA to continue to meet all explosion proof requirements.
Sealed Gauge (PSIS)
The sensor measuring pressure is sealed from atmospheric pressure on the date of calibration. The sensor will not adjust for changes in barometric pressure. For higher pressure ranges, this is less of a factor, because the difference in barometric pressure is a smaller percentage of the full scale output signal.
All AST products with explosion-proof ratings feature a conduit fitting that is certified as factory sealed. Vented sensors adjust for barometric pressure through the side of the transmitter.
American Sensor Technologies, Inc. (AST) has released the AST5300 differential pressure transducer with explosion proof and non-incendive ratings. With a high line pressure and low differential pressure measurement. Free of oil-filled cavities, the AST5300 is an ideal fit for critical measurement of liquids and gases.