Articles by Robert Henderson

Lower limits lead to conservative sensor settings

May 10, 2013
Recently lowered exposure limit guidelines for H2S, SO2 and NO2 have forced many instrument users to revisit where to set the alarms in their atmospheric monitors.


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Gas detector calibration

January 4, 2012
Failure to periodically test and document the performance of your atmospheric monitors can leave you open to regulatory citations or fines, as well as increased liability exposure in the event that a worker is injured in an accident.


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Detecting gas in confined spaces

Your sensors have benefits — and limits
July 11, 2011
Detectors use sensors that measure the most common gases.
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New TLV® exposure limit: Measuring hydrogen sulfide

June 2, 2011
In the past, the most widely recognized occupational exposure limits for hydrogen sulfide (H2S) have referenced an 8-hour TWA of 10 ppm, and a 15-minute STEL of 15 ppm. In February 2010, the American Conference of Governmental Industrial Hygienists (ACGIH®) adopted a new threshold limit value (TLV®) recommendation for H2S, lowering the 8-hour TWA to 1.0 ppm, and the STEL to 5.0 ppm.
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Docking stations: Let automation take the pain out of calibration

July 1, 2006
In the world of gas detection instrumentation, the expression “better safe than sorry” certainly holds true. Manufacturers and regulatory agencies agree the safest and most conservative approach to assuring instrumentation accuracy is to perform a functional test by exposing the instrument to known concentration test gas before each day’s use.
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