ISA-RP92.04.02, Part II : 1996(R2013)

1 Scope
2 Purpose
3 General requirements
4 Unpacking
5 Storage
6 User record keeping
7 Maintenance
8 Preparing instruments for use
9 Installation of stationary instruments
9.1 Installation in hazardous (classified) locations
9.2 Detector locations
10 Equipment checkout procedures
10.1 Portable instruments
10.2 Stationary instruments
11 General considerations
11.1 Precautions
11.2 Desensitizing agents
11.3 Entering atmospheres of potentially depleted/enriched oxygen
11.4 Use of appropriate accessories
11.5 Electromagnetic interference (EMI)
11.6 Maintenance schedule..
12 Operational check
13 Maintenance procedures
13.1 General
13.2 Preliminary checkout
13.3 Detector head
13.4 Flow system
13.5 Readout devices
13.6 Alarms
13.7 Shop calibration test
14 External power supply systems
14.1 General
14.2 AC supplies
14.3 DC supplies
8 ISA-RP92.04.02, Part II-1996 (R2013)
Annex A  Environmental and application checklist for oxygen-deficient/
oxygen-enriched (typical)
Annex B  Instrument maintenance record for oxygen-deficient/
oxygen-enriched detectors (typical)
Annex C  References

ISA-RP92.04.02 – Part II-1996 (R2013), Installation, Operation, and Maintenance of Instruments Used to Detect Oxygen-Deficient/Oxygen-Enriched Atmospheres, is a detailed guide for setting up, operating and maintaining instruments that detect when oxygen levels in the air are too low or too high. These devices play a critical role in workplace safety, particularly in factories and confined spaces where changes in oxygen can pose serious risks. This recommended practice explains proper installation procedures, including special considerations for hazardous areas and outlines regular maintenance and calibration steps to maintain accuracy. It addresses important topics such as power supply management, protection against electrical interference and testing of alarms and failure systems. Environmental factors like temperature and humidity are highlighted to help select suitable instruments, along with recommendations for keeping thorough maintenance records and using accessories to enhance performance in challenging conditions. Additionally, it supports careful management of oxygen detection equipment to create safer environments.