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SOUTH AFRICAN QUALIFICATIONS AUTHORITY 
REGISTERED UNIT STANDARD THAT HAS PASSED THE END DATE: 

Measure percentage relative humidity using secondary humidity standards 
SAQA US ID UNIT STANDARD TITLE
230189  Measure percentage relative humidity using secondary humidity standards 
ORIGINATOR
SGB Engineering 
PRIMARY OR DELEGATED QUALITY ASSURANCE FUNCTIONARY
-  
FIELD SUBFIELD
Field 06 - Manufacturing, Engineering and Technology Engineering and Related Design 
ABET BAND UNIT STANDARD TYPE PRE-2009 NQF LEVEL NQF LEVEL CREDITS
Undefined  Regular  Level 5  Level TBA: Pre-2009 was L5  4 
REGISTRATION STATUS REGISTRATION START DATE REGISTRATION END DATE SAQA DECISION NUMBER
Passed the End Date -
Status was "Reregistered" 		 2018-07-01  2023-06-30  SAQA 06120/18 
LAST DATE FOR ENROLMENT LAST DATE FOR ACHIEVEMENT
2026-06-30   2029-06-30  

In all of the tables in this document, both the pre-2009 NQF Level and the NQF Level is shown. In the text (purpose statements, qualification rules, etc), any references to NQF Levels are to the pre-2009 levels unless specifically stated otherwise.  

This unit standard does not replace any other unit standard and is not replaced by any other unit standard. 

PURPOSE OF THE UNIT STANDARD 
This unit standard will be useful to people who are required to determine the impact of Humidity on a metrological parameter being measured in the laboratory and perform humidity mapping in environmental chambers. Persons credited with this unit standard are able to measure percentage relative humidity using secondary humidity standards taking into account the effects of humidity have on standards and equipment when performing measurements, environmental humidity and/or other relevant percentage relative humidity measured at specific locations to determine actual humidity and humidity variation with time.

Learners will be able to:
  • Understand the fundamentals of temperature and percentage relative humidity.
  • Measure percentage relative humidity using laboratory reference Psychrometer.
  • Record and evaluate impact of percentage relative humidity on measurement results.
  • Apply corrections for percentage relative humidity to metrological quantities measured, when required. 
    		•

    LEARNING ASSUMED TO BE IN PLACE AND RECOGNITION OF PRIOR LEARNING 
    It is assumed that learners are already competent in:
  • Communication and Mathematical Literacy at NQF Level 4.
  • Defining the role, functions and operation of the international measurement system.
  • Applying the ISO document: "Guide to the expression of uncertainty in measurement", to estimate uncertainty of measurement.
  • Developing calibration and test methods and procedures.
  • Reporting measurement results.
  • Using and maintaining hand tools, power tools and measuring instruments.
  • Measuring temperature using secondary temperature standards. 
    		•

    UNIT STANDARD RANGE 
    N/A 

    Specific Outcomes and Assessment Criteria: 

    SPECIFIC OUTCOME 1 
    Explain the fundamentals of temperature and percentage relative humidity. 

    ASSESSMENT CRITERIA     

    ASSESSMENT CRITERION 1 
    The laws of thermodynamics, principles of vapour pressures, are explained in accordance with required standards. 

    ASSESSMENT CRITERION 2 
    The basic operation of different psychrometers is explained with examples. 

    ASSESSMENT CRITERION 3 
    The most suitable type of psychrometer is identified and explained for a given application. 

    SPECIFIC OUTCOME 2 
    Measure percentage relative humidity. 

    ASSESSMENT CRITERIA     

    ASSESSMENT CRITERION 1 
    A suitable psychrometer for a given percentage relative to humidity measurement is selected in relation to a source of traceability with national equivalence. 

    ASSESSMENT CRITERION 2 
    The psychrometers is maintained in a condition fit for purpose. 

    ASSESSMENT CRITERION 3 
    Measurement method is selected within the range and accuracy as required. 
    ASSESSMENT CRITERION RANGE 
    Laboratory or Temperature/humidity (Environmental) humidities and temperatures are measured at specified locations to determine actual humidity and temperature and humidity and temperature variation with time.
     

    ASSESSMENT CRITERION 4 
    The selected measurement method is followed in accordance with set standards. 

    ASSESSMENT CRITERION 5 
    Calibration points are selected to satisfy calibration requirements. 

    ASSESSMENT CRITERION 6 
    The number of measurements are performed relative to the required precision. 

    SPECIFIC OUTCOME 3 
    Record and evaluate results. 

    ASSESSMENT CRITERIA     

    ASSESSMENT CRITERION 1 
    The raw measurement data is recorded in accordance with specified requirements. 

    ASSESSMENT CRITERION 2 
    The uncertainty of raw measurement data is estimated in accordance with standards. 

    ASSESSMENT CRITERION 3 
    The raw data is evaluated for conformance to given accuracy specifications. 

    SPECIFIC OUTCOME 4 
    Apply corrections for the effects of percentage relative humidity. 

    ASSESSMENT CRITERIA     

    ASSESSMENT CRITERION 1 
    Effects of humidity on a given measurement system are identified in accordance with standards. 

    ASSESSMENT CRITERION 2 
    The applicable humidity sensitivity coefficients are identified for given measurement set-up. 

    ASSESSMENT CRITERION 3 
    Humidity corrections for the specific measurand are calculated and applied in accordance with specified standards. 

    ASSESSMENT CRITERION 4 
    The effect of humidity is considered in the uncertainty estimation. 


    UNIT STANDARD ACCREDITATION AND MODERATION OPTIONS 
  • Anyone assessing a learner or moderating the assessment of a learner against this Unit Standard must be registered as an assessor with the relevant Education, Training, Quality, Assurance (ETQA) Body, or with an ETQA that has a Memorandum of Understanding with the relevant ETQA.
  • Any institution offering learning that will enable the achievement of this Unit Standard must be accredited as a provider with the relevant Education, Training, Quality, Assurance (ETQA) Body, or with an ETQA that has a Memorandum of Understanding with the relevant ETQA.
  • Assessment and moderation of assessment will be overseen by the relevant Education, Training, Quality, Assurance (ETQA) Body, or by an ETQA that has a Memorandum of Understanding with the relevant ETQA, according to the ETQA's policies and guidelines for assessment and moderation.
  • Moderation must include both internal and external moderation of assessments at exit points of the Unit Standard, unless ETQA policies specify otherwise. Moderation should also encompass achievement of the competence described both in the Unit Standards.
  • Anyone wishing to be assessed against this Unit Standard may apply to be assessed by any assessment agency, assessor or provider institution that is accredited by the relevant ETQA. 
    		•

    UNIT STANDARD ESSENTIAL EMBEDDED KNOWLEDGE 
    Essential embedded knowledge will be assessed through assessment of the specific outcomes in terms of the stipulated assessment criteria. Candidates are unlikely to achieve all the specific outcomes, to the standards described in the assessment criteria, without knowledge of the listed embedded knowledge. This means that for the most part, the possession or lack of the knowledge can be directly inferred from the quality of the candidate's performance. Where direct assessment of knowledge is required, assessment criteria have been included in the body of the unit standard.

    The following embedded knowledge is addressed in an integrated way in the unit standard:
  • Laws of Thermodynamics: What is temperature, conservation of energy, direction of heat flow, Zeroth law of thermodynamics, principles of vapour pressures.
  • Hygrometers: Different types of sensors for different applications.
  • Maintenance of Reference Hygrometer/Psychrometer: Source of Traceability, Calibration requirements, importance of cleanliness of Psychrometer components.
  • Measurement of Percentage Relative Humidity: Application of the principles in percentage relative humidity measurements. 
    		•

    UNIT STANDARD DEVELOPMENTAL OUTCOME 
    N/A 

    UNIT STANDARD LINKAGES 
    N/A 


    Critical Cross-field Outcomes (CCFO): 

    UNIT STANDARD CCFO IDENTIFYING 
    Identify and solve problems and make decisions using critical and creative thinking:
  • The ability of the candidate to identify the need to measure percentage relative humidity and apply humidity corrections for a specific measurement, assess the impact and take appropriate action.

    Evident in specific outcomes:
  • "Measure percentage relative humidity."
  • "Record and evaluate results."
  • "Apply corrections for the effects of percentage relative humidity." 
    		•

    UNIT STANDARD CCFO WORKING 
    Work effectively with others as members of a team, group, organisation or community:
  • The ability and willingness of the candidate to accept and interpret work instructions and calibration/measurement procedures from customer's correctly and to request assistance in an appropriate manner as a team member.

    Evident in specific outcome:
  • "Measure percentage relative humidity." 
    		•

    UNIT STANDARD CCFO ORGANISING 
    Organise and manage themselves and their activities responsibly and effectively:
  • The preparation for measurement of humidity, the maintenance of reference standards, the candidate must indicate what equipment, set-up and measurement procedures are required and communicates to fellow workers and laboratory manager his/her intentions.

    Evident in all specific outcomes. 
    		•

    UNIT STANDARD CCFO COLLECTING 
    Collect, analyse, organise and critically evaluate information:
  • The ability of the candidate to reconcile the measured data and information from the visual examination and constantly evaluate the changing situation.

    Evident in specific outcomes:
  • "Measure percentage relative humidity."
  • "Record and evaluate results."
  • "Apply corrections for the effects of percentage relative humidity." 
    		•

    UNIT STANDARD CCFO COMMUNICATING 
    Communicate effectively, using visual, mathematical and/or language skills in the modes of oral and/or written presentations:
  • The appropriate communication with customers, laboratory manager and personnel with regard to humidity measurements and its impact in calibration and/or testing of equipment and artefacts and the measurement results achieved, will indicate his/her proficiency in effective communication.

    Evident in all specific outcomes. 
    		•

    UNIT STANDARD CCFO SCIENCE 
    Use science and technology effectively and critically showing responsibility towards the environment and health of others:
  • The ability of the candidate to effectively use the knowledge gained to inform and protect the broader environment and health of others.

    Evident in all specific outcomes. 
    		•

    UNIT STANDARD CCFO DEMONSTRATING 
    Demonstrate an understanding of the world as a set of related systems by recognising that problem-solving contexts do not exist in isolation.
  • The ability of the candidate to understand the inter relationship of percentage relative humidity and other metrological quantities in performing measurements, reporting of results and their effect on global activities.

    Evident in all specific outcomes. 
    		•

    UNIT STANDARD ASSESSOR CRITERIA 
    N/A 

    REREGISTRATION HISTORY 
    As per the SAQA Board decision/s at that time, this unit standard was Reregistered in 2012; 2015. 

    UNIT STANDARD NOTES 
    Notes to assessors:

    Assessors should keep the following principles in mind when designing and conducting assessments against this unit standard:
  • Focus the assessment activities on gathering evidence in terms of the main outcome expressed in the title to ensure assessment is integrated rather than fragmented. Remember we want to declare the person competent in terms of the title. Where assessment at title level is unmanageable, then focus assessment around each specific outcome, or groups of specific outcomes.
  • Make sure evidence is gathered across the entire range, wherever it applies. Assessment activities should be as close to the real performance as possible, and where simulations or role-plays are used, there should be supporting evidence to show the candidate is able to perform in the real situation.
  • Do not focus the assessment activities on each assessment criterion. Rather make sure the assessment activities focus on outcomes and are sufficient to enable evidence to be gathered around all the assessment criteria.
  • The assessment criteria provide the specifications against which assessment judgements should be made. In most cases, knowledge can be inferred from the quality of the performances, but in other cases, knowledge and understanding will have to be tested through questioning techniques. Where this is required, there will be assessment criteria to specify the standard required.
  • The task of the assessor is to gather sufficient evidence, of the prescribed type and quality, as specified in this unit standard, that the candidate can achieve the outcomes again and again and again. This means assessors will have to judge how many repeat performances are required before they believe the performance is reproducible.
  • All assessments should be conducted in line with the following well documented principles of assessment: appropriateness, fairness, manageability, integration into work or learning, validity, direct, authentic, sufficient, systematic, open and consistent.

    Unit standard justification:
  • Level:

    > Attributes:
    > Applied Competence at Level 5.
    > Autonomy of Learning at Level 5.

    > Actual level assigned: 5.
  • Credits:

    Total hours required by the learner to achieve the required outcome:

    > Activities:
    > Classroom Teaching: 10 Hours.
    > On-The-Job Training: 25 Hours.
    > Mentoring required: 5 Hours.
    > Other (Specify): 0 Hours.
    > Total: 40 Hours.

    > Credits assigned: 4. 
    		•

    QUALIFICATIONS UTILISING THIS UNIT STANDARD: 
      ID QUALIFICATION TITLE PRE-2009 NQF LEVEL NQF LEVEL STATUS END DATE PRIMARY OR DELEGATED QA FUNCTIONARY
    Elective  57228   National Certificate: Metrology  Level 5  Level TBA: Pre-2009 was L5  Passed the End Date -
    Status was "Reregistered"     		 2023-06-30  EWSETA 


    PROVIDERS CURRENTLY ACCREDITED TO OFFER THIS UNIT STANDARD: 
    This information shows the current accreditations (i.e. those not past their accreditation end dates), and is the most complete record available to SAQA as of today. Some Primary or Delegated Quality Assurance Functionaries have a lag in their recording systems for provider accreditation, in turn leading to a lag in notifying SAQA of all the providers that they have accredited to offer qualifications and unit standards, as well as any extensions to accreditation end dates. The relevant Primary or Delegated Quality Assurance Functionary should be notified if a record appears to be missing from here.
     
    NONE 


    All qualifications and part qualifications registered on the National Qualifications Framework are public property. Thus the only payment that can be made for them is for service and reproduction. It is illegal to sell this material for profit. If the material is reproduced or quoted, the South African Qualifications Authority (SAQA) should be acknowledged as the source.