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Elements and Performance Criteria
Range Statement
Performance Evidence
Knowledge Evidence
Evidence required to demonstrate competence in this unit must be relevant to and satisfy all of the requirements of the elements and performance criteria and include knowledge of: |
maintenance procedures in hazardous areas that will ensure the integrity of the explosion-protection technique, including:the purpose of a maintenance schedulethe purpose and extent of ‘close’, ‘sample’ and ‘periodic’ inspectionsthe features of each explosion-protection techniques that should be included in a maintenance schedulethe impact of environmental conditions on explosion-protected equipment, including corrosion and frequency of maintenancethe documentation requirements for recording the maintenance process and resultsthe use of standards in determining the requirements with which the design of explosion-protected apparatus shall complytechniques for the installation and maintenance of fixed gas detection equipment, including:use of manufacturer instruction manuals; for example, operating instructions, adjustments procedures and operational limitationsinstallation and maintenance of standards and/or codes of practice for gas detection equipmentlocation of fixed sample points or sensors, including:optimal sensingmaintainability and ease of calibrationprotection against environmental and mechanical damagegas and vapour releases, including:the nature of a sitenatural and mechanical ventilationcommon problems with fixed gas detectorscalibration and response checkingfactors to consider in the evaluation and selection of portable and fixed gas detection equipment, including:requirements for gas detection for a given situation, including:sources for obtaining data on physical chemistry of the gas to be detectedsources for obtaining data on the conditions under which the gas may be presentprocesses of assessing the specifications of gas detection equipment against established requirementsdetecting gases and vapours, including:apparatus capability and users’ knowledgepropagation of gases - release of gas and vapours, ventilation, density, and temperature and locationgases to be detected and not to be detectedintended applicationenvironmental effectssafety when monitoring for flammable gases where personnel could be presentcommon properties of gases and vapours - density of gases, vapours and their mixtures; effect of temperature on density; lower explosive limit (LEL) and upper explosive limit (UEL) of combustibles and toxicitythe differences between detecting gases and vapours - added complication of evaporation, condensation and temperature effects of vapours and their effect on propagation, calibration and detection, including samplingoxygen deficiency and effects on safety, including:chemical reaction of oxygen with solid productschemical reaction of oxygen with gaseous productsdilution of the air by displacement by some other gas or vapourmeasuring principles of catalytic sensors, electrochemical sensors, infrared sensors and semi-conductor sensors, including:common applicationslimitations and safetyinterferences of other gases with the measurementpoisoning of the sensormeasuring principles of thermal conductivity sensors, flame ionisation, detectors (FID), flame temperature analysers (FTA), photo ionisation detectors (PID) and paramagnetic oxygen detectorsselection of apparatus, including:environmentsystem response delaygas to be detected with respect to measurement principlesbehaviour of gas and vapour releases, including:rate of releasedensitytemperature/pressuredesign and installation, including:sensor, sampling or open pathlocationsiteenvironmental conditions (adverse weather, excess temperature, vibration and other mechanical interference, hosing, airborne contaminants and corrosion)integrity and safety, including:redundancyprotection against loss of power supplycommissioning and scheduled maintenance, including:sample linesdiffusion sensor screensinitial gas calibrationadjustment of alarm set pointsplans and records. |