scope:

This standard sets performance requirements for the construction and testing of toxic gas and oxygen depletion gas detection instruments. Instruments used to detect flammable (explosive) concentrations of toxic gas(es) when the LFL exceeds the TLV are excluded.

For apparatus used for sensing the presence of multiple gases that are both toxic and flammable, this document applies only to the portion sensing the presence of toxic gas or vapor.

Note: Some gases may be both toxic and flammable, and even though the concentrations required to reach the flammable limit are typically many times greater than the toxic levels, consideration of the gas detector method of protection for hazardous locations should be made when using toxic gas detectors in locations where flammable gases may be present.

This standard does not address gas monitoring or monitoring apparatus of the laboratory or scientific type used for analysis or measurement, apparatus used for process control and process monitoring purposes, or apparatus used for residential purposes.

The user should be aware of environmental effects on both the instrument and the toxic gas. The effects are not intended to be evaluated by this standard.

Toxic Gases (for gases listed in ANSI/ISA-92.00.01-2010)

Note: The 2010 edition is considered to be the minimum requirements. A later edition is permitted to be used once published.

Toxic gas detectors for the detection of the gases listed in ANSI/ISA-92.00.01 shall comply with the requirements of this standard and all applicable requirements in ANSI/ISA-92.00.01 including acceptance criteria as defined within Annex A of ANSI/ISA-92.00.01.

Toxic Gases (for gases not listed in ANSI/ISA-92.00.01-2010)

Toxic gas detectors for the detection of the gases not listed in ANSI/ISA-92.00.01-2010 shall comply with the requirements of this standard and all applicable requirements in ANSI/ISA-92.00.01-2010 with acceptance criteria defined as the manufacturer's claimed performance for each gas type. The performance parameters shall be clearly identified within the manufacturer's instruction manual. The performance parameters of each gas shall include all of the following:

the gas name and common formula

range(s) (for multiple ranges performance parameters shall be stated for each range)

accuracy (to be in the format: "± xx ppm or ± xx % of reading whichever is greater")

Response Time (T20), Response Time (T50), Response Time (T90), Recovery Time (T10). Response and Recovery time shall be of Final Value (seconds), where Final Value = value

after stabilization.

Temperature range over which the stated accuracy applies.

Oxygen Depletion

Gas detectors for the detection of oxygen levels below 21% by volume shall comply with the requirements of this standard and all applicable requirements in ANSI/ISA-92.04.01-1996.

Note: The 1996 edition is considered to be the minimum requirements. A later edition is permitted to be used once published.

Common Low Concentration Gases

For a gas detector which measures a gas that is also flammable, this standard is applicable for ranges from ppm level up to 3% of the lower flammable limit. For example, hydrogen - with an LFL of 4%v/v (40,000 ppm) shall be tested as a toxic gas up to a concentration of 1200 ppm. Measurement levels above 1200 ppm shall be tested as a flammable gas.

Purpose

This standard states testing and certification requirements for toxic gas and oxygen depletion gas detection instruments.

Testing and certification criteria may include, but are not limited to, performance requirements, marking requirements, examination of manufacturing facility(ies), audit of quality assurance procedures, and a surveillance program.