SAQA 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.
SOUTH AFRICAN QUALIFICATIONS AUTHORITY 
REGISTERED UNIT STANDARD: 

Perform Liquid in Glass Thermometry measurements and calibrate Liquid in Glass Thermometers (LIGs) 
SAQA US ID UNIT STANDARD TITLE
230196  Perform Liquid in Glass Thermometry measurements and calibrate Liquid in Glass Thermometers (LIGs) 
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 
REGISTRATION STATUS REGISTRATION START DATE REGISTRATION END DATE SAQA DECISION NUMBER
Reregistered  2018-07-01  2023-06-30  SAQA 06120/18 
LAST DATE FOR ENROLMENT LAST DATE FOR ACHIEVEMENT
2024-06-30   2027-06-30  

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 
Since Metrology covers a wide spectrum of measurement disciplines, this unit standard should be seen as covering only one of the disciplines. Although many metrology processes are similar, there are distinct competency differences between various technically specialized parameters within each discipline.

This unit standard will be useful to metrologists who are required to perform measurements and calibrations within the Temperature discipline in the following parameters:

Liquid in Glass Thermometry and liquid in Glass Thermometers (LIG's)

Persons credited with this unit standard are able to calibrate devices and artefacts for metrology. This includes all aspects related to the work of performing measurements and maintaining the necessary standards and transferring accuracy traceability from National Measurement Standards to a unit under test.

The Metrology process, referred to above, is generically the same for all disciplines within metrology fields, but the embedded knowledge is uniquely different. The process is to:
  • Maintain reference standards.
  • Derive, generate and measure quantities and calibrate devices.
  • Record, evaluate and report the results.

    When Liquid in Glass thermometers (LIG) are to be calibrated, the generic Metrology process mentioned above, will focus specifically on Liquid in Glass thermometry measurement which includes:
  • Generate the Ice Point (0.0 C).
  • Generate specific temperatures using isothermal media.
  • Measure the Ice point and other temperatures with reference Thermometers.
  • Repeat Ice point measurements after 24 hours.
  • Record, evaluate and report the results.

    Therefore, the purpose of this unit standard is to calibrate Liquid in Glass Thermometers (LIG's), including all aspects of using isothermal media to generate stable temperatures; measuring the temperatures generated using Liquid in Glass thermometer standards or thermometry systems to generate a known temperature; and calibrate Liquid in Glass thermometers (LIG's) at specific temperature points for transferring accuracy traceability.

    Learners will be able to:
  • Prepare Liquid in Glass Thermometers (LIG's) for calibration.
  • Calibrate Liquid in Glass Thermometers (LIG's) against Reference Platinum Resistance Thermometer (PRT) or Liquid in Glass standards and thermometry systems, over specific temperature ranges.
  • Record, evaluate and report results. 

  • 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.
  • Developing calibration and test methods and procedures.
  • Reporting measurement results.
  • Measuring temperature using secondary temperature standards.
  • Generate reference temperatures and scales. 

  • UNIT STANDARD RANGE 
    N/A 

    Specific Outcomes and Assessment Criteria: 

    SPECIFIC OUTCOME 1 
    Prepare Liquid in Glass Thermometers (LIGs) for calibration. 

    ASSESSMENT CRITERIA
     

    ASSESSMENT CRITERION 1 
    The fundamentals of liquid-in-glass thermometry are explained with examples. 

    ASSESSMENT CRITERION 2 
    Thermometer liquid column faults are rectified in accordance with procedures. 

    ASSESSMENT CRITERION 3 
    The correct realisation of an Ice point (0,0C) is demonstrated with examples. 

    ASSESSMENT CRITERION 4 
    The correct iso-thermal media is selected and a temperature is generated to calibrate a Liquid-in-glass Thermometer(LIG) at a given temperature. 
    ASSESSMENT CRITERION RANGE 
    Isothermal media suitable for type of calibration (partial or total immersion).
     

    ASSESSMENT CRITERION 5 
    A reference measurement is correctly performed by means of an Ice point. 

    ASSESSMENT CRITERION 6 
    The correct temperature of iso-thermal media is confirmed by measurement. 

    SPECIFIC OUTCOME 2 
    Calibrate Liquid in Glass Thermometers (LIG). 

    ASSESSMENT CRITERIA
     

    ASSESSMENT CRITERION 1 
    The measurement method selected, is suitable for the immersion depth requirements of the thermometer, and satisfies the range and accuracy required. 

    ASSESSMENT CRITERION 2 
    The measurement method is selected and followed in accordance with procedures. 

    ASSESSMENT CRITERION 3 
    The temperature indicated by the Emergent liquid column (ELC), for partial immersion thermometers, is recorded and ELC corrections are correctly applied. 

    ASSESSMENT CRITERION 4 
    Calibration points are selected to satisfy calibration requirements. 

    ASSESSMENT CRITERION 5 
    Measurements are performed within the required precision. 

    ASSESSMENT CRITERION 6 
    Applicable safety requirements are adhered to in accordance with current legislation. 

    SPECIFIC OUTCOME 3 
    Record, evaluate and report results. 

    ASSESSMENT CRITERIA
     

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

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

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

    ASSESSMENT CRITERION 4 
    An appropriately detailed measurement report/certificate is generated for given measurement results in accordance with applicable standards. 


    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 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:
  • Fundamentals of Temperature.

    Laws of thermodynamics.
  • Generation of Reference Temperatures and Scales.

    Realisation of an Ice point, generating stable temperatures using isothermal media, operating principles of isothermal media e.g. Isothermal media include the following : Ice point, Stirred liquid baths (alcohol, water, oil).
  • Calibration of Liquid in Glass thermometers.

    Specification of thermometer, Design principle, Zero reference point measurement for determining secular change, Correct use of thermometers w.r.t depth of immersion, Calibration against thermometry system or standard LIG thermometer, Calibration process of LIG and range- and measurement applications of these thermometers. 

  • 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.

    Note: The ability of the candidate to identify incorrect conditions with reference standards, incorrect measurements taken for a specific parameter, assess and taken appropriate action.

    Refer to specific outcomes:
  • Prepare Liquid in Glass Thermometers (LIG's) for calibration.
  • Calibrate Liquid in Glass Thermometers (LIG).
  • Record, evaluate and report results. 

  • UNIT STANDARD CCFO WORKING 
    Work effectively with others as members of a team, group, organisation or community.

    Note: The ability and willingness of the candidate to accept and interpret work instructions and calibration/measurement procedures from customers correctly and to request assistance in an appropriate manner as a team member.

    Refer to specific outcomes:
  • Record, evaluate and report results. 

  • UNIT STANDARD CCFO ORGANISING 
    Organise and manage themselves and their activities responsibly and effectively.

    Note: The preparation for measurement of liquid in glass temperature devices, the maintenance of reference standards, the candidate must indicate what tools, equipment, set-up and calibration procedures is required and communicates to fellow workers and laboratory manager his/her intentions.

    Refer to specific outcomes:
  • Prepare Liquid in Glass Thermometers (LIG's) for calibration.
  • Calibrate Liquid in Glass Thermometers (LIG).
  • Record, evaluate and report results. 

  • UNIT STANDARD CCFO COLLECTING 
    Collect, analyse, organise and critically evaluate information.

    Note: The ability of the candidate to reconcile the measured data and information from the visual examination and constantly evaluate the changing situation.

    Refer to specific outcomes:
  • Prepare Liquid in Glass Thermometers (LIG's) for calibration.
  • Calibrate Liquid in Glass Thermometers (LIG).
  • Record, evaluate and report results. 

  • UNIT STANDARD CCFO COMMUNICATING 
    Communicate effectively, using visual, mathematical and / or language skills in the modes of oral and / or written presentations.

    Note: The appropriate communication with customers, laboratory manager and personnel with regard to maintenance of Reference Standards, calibration and/or testing of equipment and artefacts and the measurement results achieved, will indicate his/her proficiency in effective communication. 

    UNIT STANDARD CCFO SCIENCE 
    Use science and technology effectively and critically showing responsibility towards the environment and health of others.

    Note: The ability of the candidate to effectively use the knowledge gains to inform and protect the broader environment and health of others

    Refer to specific outcomes:
  • Prepare Liquid in Glass Thermometers (LIG's) for calibration.
  • Calibrate Liquid in Glass Thermometers (LIG).
  • Record, evaluate and report results. 

  • 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.

    Note: The ability of the candidate to understand the inter relationship between temperature measurements, maintenance and calibration of standards, reporting of results and their effect on global activities.

    Refer to specific outcomes:
  • Prepare Liquid in Glass Thermometers (LIG's) for calibration.
  • Calibrate Liquid in Glass Thermometers (LIG).
  • Record, evaluate and report results. 

  • 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:

    Attribute: Level
  • Applied Competence: 5
  • Autonomy of learning: 5

    Actual Level Assigned: 5
  • Credits:

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

    Activity: Hours
  • Classroom Teaching: 20
  • On-The-Job Training: 30
  • Mentoring required: 10
  • Other (Specify): -
    Total: 60

    Credits Assigned: 6 

  • 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  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.
     
    1. NATIONAL METROLOGY INSTITUTE OF SOUTH AFRICA 



    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.