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| ASI Product |
| Fast-Response Gas Sensor Products Product Overviews
miniPID The miniPID photo-ionization detector combines small size, fast response, and high sensitivity in an easy-to-use, competitively priced package. The sensor has a true frequency response of 330 Hz with a 10-90% rise time of 0.5 msec. The detection limit is 50 ppb (parts per billion) propylene gas in air and the full-scale measurement range is 1000 ppm. The sensor head contains the detection cell, electrometer, RF-excited UV lamp and lamp control circuitry. The easy-to-use controller has on/off switches for instrument and pump power, a three position switch for gain range selection, and a potentiometer for setting the zero. LEDs provide indication of power, pump, and lamp status. A front-panel display provides a fast-response indication of the output signal from the sensor. The miniPID has been used
successfully during concentration fluctuation field trials at U.S. Army Dugway
Proving Ground and during wind tunnel studies at the University of Utah. The
sensor has proven to be easy to use, reliable, and robust.
digitalPID The digitalPID digital photo-ionization detector combines fast response, high sensitivity and micro-processor control in an easy-to-use package. The sensor has a frequency response of 50 Hz and a detection limit of 40 ppb (parts per billion) propylene gas in air. It is self-contained and only requires a 12 volt battery or AC adapter for power. A built-in micro-processor allows all functions of the sensor (on/off, gain, zero, data transmission, and temperature control) to be remotely controlled through either the RS-232 or RS-485 communications interface. A 20-bit charge-digitizing analog-to-digital converter provides precision conversion of the sensor output. Easy-to-use control software provides the functions required for control, data retrieval, and calibration of up to 16 sensors. Data from up to 16 sensors can be simultaneously displayed on the computer screen in real-time while data logging is underway. The software operates under the DOS operating system and requires a PC with an i486 or better processor. Eighty digitalPID sensors have been constructed for U.S. Army Dugway Proving Ground and a further four for Defence Research Establishment Suffield. These sensors have been used successfully at Dugway Proving Ground for concentration fluctuation field trials and biological field trials. In addition the sensors have been used for dense gas dispersion studies at the Nevada Test Site. In each of these trials the sensors have proven to be easy to use, reliable and robust. |
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