Analytical Sensors & Instruments Ltd. provides innovative, high quality electrochemical sensors to users and OEM customers worldwide. The ASI team can provide you with unlimited designs for measurement in a wide variety of applications including medical, environmental monitoring, process monitoring and control, education, recreational water purity monitoring and others. For users, ASI stocks a variety of popular models of pH, conductivity, dissolved oxygen and ion selective electrodes. In addition, ASI engineers and sales professionals can design custom solutions to satisfy even the most complex and challenging projects.

About Us

ASI owes her humble beginning to her founders, Peter and Yuxian Cai. In 1989 Peter and Yuxian started ASI in the garage of their own house. Prior to the founding of ASI, Peter and Yuxian each had already spent 25 years working for electrode manufacturing companies, learning and contributing to the progression of this industry. Yuxian was trained as a glass blower for various pH bulbs in China and has trained all glass blowers at ASI and Aurora.

Starting with a handful of electrode designs, Peter and Yuxian set out to develop different glass formularies to differentiate ASI from the competition. Today, ASI has 5 regularly used pH formulas, one sodium formula, 24 ion selective electrode formulas, 4 ORP (Redox) formats, and close to 10 conductivity designs and many other techniques that Peter and Yuxian have developed at ASI to satisfy our customer needs.

In 1989, ASI only had two employees working in a converted home garage. Today ASI employs over 170 employees worldwide with offices in Texas, Colorado, and Shanghai, China with a total manufacturing space of 40,000 square feet. ASI also has two engineering groups and a fully functioned R&D lab to service our customers in the US and abroad. To meet our customer needs, the plastic molding shop in Shanghai has the full capability of custom mold manufacturing and design as well as plastic injection for high quality but small volume plastic parts. The plastic molding shop has been one of the fastest growing segments of ASI business over the past few years.

We would like to thank all our customers for their years of loyalty and we look forward to many more years of providing them customers with great customer service, quality, and affordable products as well as worldwide engineering and manufacturing services.


Twistlock - Model PT Series - Industrial/Process Sensors

The ASI PT Twistlock design is o very popular design with its ability to be inserted and removed from the process with a simple V* turn of the electrode. This electrode can be purchased as a kit (including the adapter and safety ring) or as a stand alone electrode. If the application changes to a submersible installation, we provide Vi' NPT threads on the bock of the electrode. Triple O-rings provide redundant process seals and the locking pins are ...

Model 25 Series - Stainless Steel Temperature Probes

The ASI model T025 stainless steel temperature probe provides accuracy over a broad range of temperatures   The Santoprene handle resists damage from charmed contact while the molded strain relief protects the coble, Additionally the T025 is completely submersible.


Pittcon 2012

Company details

Business Type:

Industry Type:
Monitoring and Testing

Market Focus:
Globally (various continents)

Year Founded:


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