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Model 101 Portable Photoionizers from HNU Systems, Inc., are the photoionizers most preferred by industrial hygienists, plant operators, and field investigators. This is evidenced by the more than 20,000 Model 101s currently in use throughout the world. The Model 101 is written into more standards and protocols than any other similar instrument.


HNU has been manufacturing quality environmental monitoring instrumentation since 1973. The Model 101 has proven reliable time and time again under demanding and hazardous conditions. The PI-101 was one of the first hydrocarbon monitors to be use at a hazardous waste site (Love Canal-1976).


with a detection limit of less than 0.2 ppm, the Model 101 provides the best low-end sensitivity of any comparably priced instrument. lt provides accurate detection and measurement of concentrations at or below the PELs (personal exposure limits) established by OSHA and other regulatory agencies.

Easy To Use

Our unique patented ion chamber allows the use of an electronic zero, thereby eliminating the need for zero gas. The Model 101 is the most convenient and easy-to-use portable photoionization detector available.

List of photoionization - charakteristics

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