Bob Henderson

Bob Henderson is President of GfG Instrumentation, Inc. in Ann Arbor, Michigan.Robert has been a member of the American Industrial Hygiene Association since 1992. He is an active member of the AIHA Real Time Detection Systems Technical Committee, and the AIHA Confined Spaces Committee. He is also a past chair of the Instrument Products Group of the International Safety Equipment Association. Robert has over 37 years of experience in the design, sale and marketing of atmospheric monitoring instruments used in confined space, industrial safety, and industrial hygiene monitoring applications.

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Articles by Bob Henderson


Confined Spaces: Standards and Guidelines to Know Confined Spaces: Standards and Guidelines to Know Confined Spaces: Standards and Guidelines to Know Confined Spaces: Standards and Guidelines to Know


Confined spaces open the door to a host of associated hazards. Learn what a confined space is, and how to stay safe when working in one.

Q&A by Bob Henderson


What are the most common toxic gases in confined spaces? What are the most common toxic gases in confined spaces? What are the most common toxic gases in confined spaces? What are the most common toxic gases in confined spaces?


Toxic gases can be produced by materials deliberately used or stored in confined spaces, can be produced by natural processes, can be...

What kinds of sensors are used to detect LEL combustible gas? What kinds of sensors are used to detect LEL combustible gas? What kinds of sensors are used to detect LEL combustible gas? What kinds of sensors are used to detect LEL combustible gas?


Confined space instruments almost always include a sensor used to measure percent LEL combustible gas. There are two types of widely used...

What combustible gases are associated with confined spaces? What combustible gases are associated with confined spaces? What combustible gases are associated with confined spaces? What combustible gases are associated with confined spaces?


Combustible gases and vapors can be produced by materials used or stored in confined spaces, as well as natural processes. The most common...

What is a hazardous combustible gas atmosphere? What is a hazardous combustible gas atmosphere? What is a hazardous combustible gas atmosphere? What is a hazardous combustible gas atmosphere?


In order for an atmosphere to be capable of burning explosively, four conditions must be met.Adequate oxygenAdequate fuelA source of...

Oxygen enrichment in confined spaces Oxygen enrichment in confined spaces Oxygen enrichment in confined spaces Oxygen enrichment in confined spaces


The concentration of oxygen in confined spaces is a concern from two standpoints. Too little oxygen can cause asphyxiation. Excessively...

What is oxygen deficiency? What is oxygen deficiency? What is oxygen deficiency? What is oxygen deficiency?


Fresh air contains approximately 20.9% oxygen (O2). According to OSHA, atmosphere that contains less than 19.5% by volume is hazardous due...

What is a hazardous atmosphere? What is a hazardous atmosphere? What is a hazardous atmosphere? What is a hazardous atmosphere?


According to OSHA, “hazardous atmosphere” means an atmosphere that may expose employees to the risk of death, incapacitation,...

What is a permit required confined space (PRCS)? What is a permit required confined space (PRCS)? What is a permit required confined space (PRCS)? What is a permit required confined space (PRCS)?


Many confined spaces are associated with serious safety hazards, and require special procedures to ensure worker safety.According to 29 CFR...

What is a confined space? What is a confined space? What is a confined space? What is a confined space?


According to 29 CFR 1910.146, a confined space is characterized by the simultaneous existence of three conditions:It must be large enough...