This describes the essential skills and knowledge and their level required for this unit

Evidence shall show that knowledge has been acquired of safe working practices and designing gas detection systems

All knowledge and skills detailed in this unit should be contextualised to current industry practices and technologies

KSEMA Gas detection systems

Evidence shall show an understanding of gas detection systems to an extent indicated by the following aspects

T Maintenance procedures in hazardous areas that will ensure the integrity of the explosionprotection technique encompassing

the purpose of a maintenance schedule

the purpose and extent of close sample and periodic inspections

the features of each explosionprotection techniques that should be included in a maintenance schedule

the impact of environmental conditions on explosionprotected equipment including corrosion and frequency of maintenance

the documentation requirements for recording the maintenance process and results

the use of Standards in determining the requirements with which the design of explosionprotected apparatus shall comply

T Techniques for the installation and maintenance of fixed gas detection equipment encompassing

Use of manufacturers instruction manual for example operating instructions adjustments procedures and operational limitations

Installation and maintenance of Standards andor Codes of Practice for gas detection equipment

T Location of fixed sample points or sensors encompassing

optimal sensing

maintainability and ease of calibration and

protection against environmental and mechanical damage

T Gas and vapour releases encompassing

the nature of a site and

natural and mechanical ventilation

T Common problems with fixed gas detectors

T Calibration and response checking

T Factors to consider in the evaluation and selection of portable and fixed gas detection equipment encompassing

Requirements for gas detection for a given situation

sources for obtaining data on physical chemistry of the gas to be detected and

sources for obtaining data on the conditions under which the gas may be present

processes of assessing the specifications of gas detection equipment against established requirements

T Detecting gases and vapours encompassing

apparatus capability and users knowledge

propagation of gases This includes release of gas and vapours ventilation density temperature and location

gases to be detected and not to be detected

intended application

environmental effects

safety when monitoring for flammable gases where personnel could be present

common properties of gases and vapours This includes density of gases vapours and their mixtures effect of temperature on density LEL and UEL of combustibles and toxicity

the differences between detecting gases and vapours These include added complication of evaporation condensation and temperature effects of vapours and their effect on propagation calibration and detection including sampling

T Oxygen deficiency and effects on safety encompassing

chemical reaction of oxygen with solid products

chemical reaction of oxygen with gaseous products and

dilution of the air by displacement by some other gas or vapour

T Measuring principles of catalytic sensors electrochemical sensors infrared sensors and semiconductor sensors encompassing

common applications

limitations and safety

interferences of other gases with the measurement and

poisoning of the sensor

NOTE Detailed information on gas detection is given in ASNZS

T Measuring principles of thermal conductivity sensors flame ionization detectors FID flame temperature analyzers FTA photo ionisation detectors PID and paramagnetic oxygen detectors

T Selection of apparatus encompassing

environment

system response delay and

gas to be detected with respect to measurement principles

T Behaviour of gas and vapour releases encompassing

rate of release

density and

temperaturepressure

T Design and installation encompassing

sensor sampling or open path

location

site and

environmental conditions

NOTE These include adverse weather excess temperature vibration and other mechanical interference hosing airborne contaminants and corrosion

T Integrity and safety encompassing

redundancy and

protection against loss of power supply

T Commissioning and scheduled maintenance encompassing

sample lines

diffusion sensor screens

initial gas calibration

adjustment of alarm set points and

plans and records

This provides essential advice for assessment of the unit and must be read in conjunction with the performance criteria and the range statement of the unit and the Training Package Assessment Guidelines

The Evidence Guide forms an integral part of this unit It must be used in conjunction with all components parts of this unit and performed in accordance with the Assessment Guidelines of this Training Package

Overview of Assessment

Longitudinal competency development approaches to assessment such as Profiling require data to be reliably gathered in a form that can be consistently interpreted over time This approach is best utilised in Apprenticeship programs and reduces assessment intervention It is the industrypreferred model for apprenticeships However where summative or final assessment is used it is to include the application of the competency in the normal work environment or at a minimum the application of the competency in a realistically simulated work environment It is recognised that in some circumstances assessment in part or full can occur outside the workplace However it must be in accord with industry and regulatory policy

Methods chosen for a particular assessment will be influenced by various factors These include the extent of the assessment the most effective locations for the assessment activities to take place access to physical resources additional safety measures that may be required and the critical nature of the competencies being assessed

The critical safety nature of working with electricity electrical equipment gas or any other hazardous substancematerial carries risk in deeming a person competent Sources of evidence need to be rich in nature to minimise error in judgment

Activities associated with normal everyday work influence decisions about howhow much the data gathered will contribute to its richness Some skills are more critical to safety and operational requirements while the same skills may be more or less frequently practised These points are raised for the assessors to consider when choosing an assessment method and developing assessment instruments Sample assessment instruments are included for Assessors in the Assessment Guidelines of this Training Package

Critical aspects of evidence required to demonstrate competency in this unit

Before the critical aspects of evidence are considered all prerequisites shall be met

Evidence for competence in this unit shall be considered holistically Each element and associated performance criteria must be demonstrated on at least two occasions in accordance with the Assessment Guidelines UEE Evidence shall also comprise

Evidence for competence in this unit shall be considered holistically. Each element and associated performance criteria must be demonstrated on at least two occasions in accordance with the 'Assessment Guidelines - UEE07 '. Evidence shall also comprise:

A representative body of work performance demonstrated within the timeframes typically expected of the discipline work function and industrial environment In particular this shall incorporate evidence that shows a candidate is able to

Implement Occupational Health and Safety workplace procedures and practices including the use of risk control measures as specified in the performance criteria and range statement

Apply sustainable energy principles and practices as specified in the performance criteria and range statement

Demonstrate an understanding of the essential knowledge and associated skills as described in this unit It may be required by some jurisdictions that RTOs provide a percentile graded result for the purpose of regulatory or licensing requirements

Demonstrate an appropriate level of skills enabling employment

Conduct work observing the relevant Anti Discrimination legislation regulations polices and workplace procedures

Demonstrated consistent performance across a representative range of contexts from the prescribed items below

Design gas detection systems as described in and including

A

Accessing and interpreting gas detection needs and parameters

B

Providing selection options based on parameters for gas detection and economic considerations

C

Following checking and documentation procedures

D

Applying relevant contingency management skills

Context of and specific resources for assessment

This unit should be assessed as it relates to normal work practice using procedures information and resources typical of a workplace This should include

OHS policy and work procedures and instructions

Suitable work environment facilities equipment and materials to undertake actual work as prescribed by this unit

These should also be part of the formal learningassessment environment

Note

Where simulation is considered a suitable strategy for assessment conditions must be authentic and as far as possible reproduce and replicate the workplace and be consistent with the approved industry simulation policy

The resources used for assessment should reflect current industry practices in relation to designing gas detection systems

Method of assessment

This unit shall be assessed by methods given in Volume Part Assessment Guidelines

Note

Competent performance with inherent safe working practices is expected in the Industry to which this unit applies This requires assessment in a structured environment primarily intended for learningassessment which incorporates all necessary equipment and facilities for learners to develop and demonstrate the essential knowledge and skills described in this unit

Concurrent assessment and relationship with other units

For optimisation of training and assessment effort competency development in this unit may be arranged concurrently with any of the following units

UEENEEMA Design explosionprotected electrical systems and installations gas atmospheres

UEENEEM056A Design explosion-protected electrical systems and installations gas atmospheres

UEENEEMA Design explosionprotected electrical systems and installations gas atmospheres

UEENEEM057A Design explosion-protected electrical systems and installations gas atmospheres

UEENEEMA Design explosionprotected electrical systems and installations dust atmospheres

UEENEEM058A Design explosion-protected electrical systems and installations dust atmospheres