25888 version 1
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Demonstrate knowledge of process theory for industrial measurement
and control systems
Level
5
Credits
5
Purpose
This unit standard is intended for use in the training and assessment of
industrial measurement and control technicians beyond the knowledge and
skills included in the National Certificate in Industrial Measurement and
Control (Level 4) [Ref: 0410].
People credited with this unit standard are able to demonstrate knowledge of:
– process dynamics;
– controlled variable/manipulated variable pairing;
– disturbances;
– process control criteria; and
– standard control system strategies.
Subfield
Industrial Measurement and Control
Domain
Industrial Measurement and Control - Theory
Status
Registered
Status date
21 August 2009
Date version published
21 August 2009
Planned review date
31 December 2015
Entry information
Open.
Accreditation
Evaluation of documentation and visit by NZQA, industry
and teaching professional in the same field from another
provider.
Standard setting body (SSB)
ElectroTechnology Industry Training Organisation
Accreditation and Moderation Action Plan (AMAP) reference
0003
This AMAP can be accessed at http://www.nzqa.govt.nz/framework/search/index.do.
Special notes
1
This unit standard has been designed for learning and assessment off-job.
 New Zealand Qualifications Authority 2016
25888 version 1
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2
Definition
Industry practice – those practices that competent practitioners within the industry
recognise as current industry best practice.
3
Range
a All activities and evidence presented for all elements and performance criteria in
this unit standard must be in accordance with legislation, policies, procedures,
ethical codes and standards, and industry practice; and where appropriate,
manufacturers’ instructions, specifications, and data sheets.
b Evidence of elements 1 to 4 comprise knowledge that is to be applied to element
5 which is a case study of combustion/boilers and one other process.
Elements and performance criteria
Element 1
Demonstrate knowledge of process dynamics.
Performance criteria
1.1
Processes are described in terms of equilibrium conditions and response to
imbalance.
Range
material balance, energy balance, force or momentum balance.
Evidence of two is required.
1.2
Control strategies are described in terms of effects on equilibrium.
1.3
Response rate is estimated from process data.
Element 2
Demonstrate knowledge of controlled variable/manipulated variable pairing.
Performance criteria
2.1
Requirement for one manipulated variable for each controlled variable is
explained.
2.2
Requirement to match manipulated variable to manipulated variable in
multivariable systems is explained.
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Element 3
Demonstrate knowledge of process disturbances.
Performance criteria
3.1
Disturbances are characterised and the differences explained.
Range
3.2
supply side, demand side; must be consistent with previously used
terminology.
Rate of change of disturbance is compared with process response time.
Element 4
Demonstrate knowledge of process control criteria.
Performance criteria
4.1
Requirements for control systems are described.
Range
dynamic response, control limits, operator interaction, start-up and
shut-down, safety and protection.
Element 5
Demonstrate knowledge of standard control system strategies.
Range
may include but is not limited to – boiler drum level control strategies – 1, 2, and
3 element control; cross-limiting boiler combustion control; distillation control;
pH control for wastewater treatment; steam turbine governing and pressure
control, multi-effect evaporators.
Evidence of three is required.
Performance criteria
5.1
Constraints and limitations of the controlled process are explained.
Range
5.2
Performance of the control strategy is described.
Range
5.3
constraints may include but are not limited to – safety restrictions,
loading or unloading rates, temperature rates of rise or fall,
temperature differentials, capacity of associated equipment.
normal operation, process upsets, emergency conditions.
Configuration requirements for control system are explained in terms of system
sensitivity.
Range
transmitter ranges, signal conditioning, final control element sizing
and selection, measurement span.
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Please note
Providers must be accredited by NZQA, or an inter-institutional body with delegated
authority for quality assurance, before they can report credits from assessment against
unit standards or deliver courses of study leading to that assessment.
Industry Training Organisations must be accredited by NZQA before they can register
credits from assessment against unit standards.
Accredited providers and Industry Training Organisations assessing against unit standards
must engage with the moderation system that applies to those standards.
Accreditation requirements and an outline of the moderation system that applies to this
standard are outlined in the Accreditation and Moderation Action Plan (AMAP). The
AMAP also includes useful information about special requirements for organisations
wishing to develop education and training programmes, such as minimum qualifications for
tutors and assessors, and special resource requirements.
Comments on this unit standard
Please contact the ElectroTechnology Industry Training Organisation
reviewcomments@etito.co.nz if you wish to suggest changes to the content of this unit
standard.
 New Zealand Qualifications Authority 2016