Reader Feedback: Long-Distance Calibration

A Reader Writes In to Tell Us That the Users We Quoated in an Article Are Not Considering the Latest Technology Presented at an ISA International Instrumentation Seminar

I read with interest your article, "Long-Distance Calibration" in the March issue of  Control. However, they [the users in Ceuta] are not considering the latest technology presented at an ISA International Instrumentation Seminar ("Calibration of Differential Pressure Transmitters On-Line at Process Conditions," Proceedings of the 54th International Instrumentation Symposium, May 5-8, 2008. IIS08 P004).

Understanding the difficulty, costs and production upsets caused by calibration deficiencies, I conceived and presented a method for assuring calibration of a differential pressure transmitter on a flow or liquid level application from a remote control room while on-line, without process interruption, compensating for all steady-state and equilibrated-state, combined, simultaneous process and ambient influences within the entire limits of operation to  0.005% of reading, traceable to NIST with no technician involved. Thus, I could assure calibration from a remote site on demand or as scheduled—a significant advantage compared to shipping three flight cases and a specialist traveling to site. Furthermore, the specialists could not assure calibration to 0.005% of reading under combined simultaneous process and ambient conditions!

George Sgourakes
President, Avgi Engineering

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