Explosion-proof pressure sensor handles hydrogen
An
American Sensor Technologies product story
Edited by the Engineeringtalk editorial team
Aug 19, 2004
The Model AST 4600 explosion-proof pressure sensor is ideal for use in hydrogen service and other hazardous applications.
The Model AST 4600 explosion-proof pressure sensor is ideal for use in hydrogen service and other hazardous applications such as refineries, water treatment plants, natural gas compressors and power generation.
Employing a thick one-piece 316L diaphragm free of internal O-rings, welds and fill fluids, the AST 4600 pressure transducers perform accurately and safely in hydrogen applications without the threat of sensor failure caused by hydrogen permeation.
Approved to CSA30 (UL1203) Class 1, Div.
1, Explosion Proof, Groups A, B, C and D, units can withstand the high vibration and temperature extremes common in hydrogen applications.
"Pressure transducers employing thin diaphragms with fluid fill are prone to hydrogen permeation which leads to sensor cracks and eventual unit failure", explains Karmjit S Sidhu, Vice President Business Development, American Sensor Technologies.
"Our Model AST4600 explosion-proof sensors feature a unique one-piece design that provides a hermetic seal against the media".
Constructed of 316L stainless steel wetted materials, the AST4600 explosion-proof Series provides long life and high resistance to embrittlement caused by long-term exposure to hydrogen.
The high strength stainless steel construction contains no silicone oil, no welds, and no internal O-rings, offering a full hermetic seal against corrosive media.
In addition to using strain gauge technology, the company implements its own-patented Krystal Bond technology to produce pressure transducers that yield a high output with low thermal errors.
The AST4600 explosion-proof pressure sensors provide measurement in sealed gauge up to 10,000lb/in2.
Sensors are calibrated and temperature compensated to ensure stability over specified ranges.
Units offer accuracy of better than 0.25% BFSL at 25C and long-term stability of +0.25% full scale output per annum.
AST4600 pressure sensors are available with an output of 1-5V, 1-6V or 4-20mA.
They can be configured with a variety of pressure ports and whetted materials.
"With hydrogen gaining popularity as an alternative fuel to foreign oil supplies, there will be greater demand for sensors that can perform over time in hydrogen generation and storage applications", notes Sidhu.
"The AST4600 pressure sensors are price competitive, high quality explosion-proof units that are qualified for use in these applications".
Although the AST4600 is most suitable for use in very hostile environments, any AST pressure transducer can be constructed with properties to make it suitable for use in hydrogen applications.
AST offers a complete range of pressure transducers that address different performance specifications, installations and cost parameters.
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