NZQA registered unit standard
28077 version 1
Page 1 of 4
Title
Demonstrate knowledge of the physical principles of instrumentation
systems
Level
3
Credits
5
Purpose
People credited with this unit standard are able to demonstrate
knowledge of the physical principles of:
 pressure measurement;
 level measurement;
 temperature measurement;
 flow measurement;
 density measurement.
Classification
Industrial Measurement and Control > Industrial Measurement
and Control - Theory
Available grade
Achieved
Explanatory note
1
Reference
ANSI/ISA-51.1-1979 (R1993) Process Instrumentation Terminology;
and all subsequent amendments and replacements.
Outcomes and evidence requirements
Outcome 1
Demonstrate knowledge of the physical principles of pressure measurement.
Evidence requirements
1.1
Describe units used for pressure measurement.
Range
1.2
Explain gas laws and perform calculations.
Range
1.3
gauge pressure, absolute pressure, atmospheric pressure, bar,
kilo Pascals (kPa), pounds per square inch (psi), millimetres of
water (mmH2O), millimetres of mercury (mmHg), millibar (mbar).
gas laws – Boyle's Law, Charles' Law, General Gas Law.
Describe effects of liquid pressure head and perform calculations.
Range
The Skills Organisation
SSB Code 100401
level, manometers, head correction.
 New Zealand Qualifications Authority 2016
NZQA registered unit standard
1.4
28077 version 1
Page 2 of 4
Use calculations and tables to convert pressure units.
Range
bar, kPa, psi, mmH2O, mmHg, mbar.
Outcome 2
Demonstrate knowledge of the physical principles of level measurement.
Evidence requirements
2.1
Describe effects of liquid pressure head and perform calculations.
Range
2.2
Use calculations and tables to convert pressure units used in level
measurement.
Range
2.3
level, manometers, head correction, density.
bar, kilo Pascals (kPa), pounds per square inch (psi), millimetres
of water (mmH2O), millimetres of mercury (mmHg), millibar (mbar).
Explain Archimedes’ Principle as used in displacer level measurement.
Outcome 3
Demonstrate knowledge of the physical principles of temperature measurement.
Evidence requirements
3.1
Define common temperature scales.
Range
3.2
centigrade (°C), fahrenheit (°F), kelvin (K), rankin (R).
Use calculations to convert units used in temperature measurement.
Range
°C, °F, K.
Outcome 4
Demonstrate knowledge of the physical principles of flow measurement.
Evidence requirements
4.1
State the units for volumetric and mass flow measurement.
Range
The Skills Organisation
SSB Code 100401
cubic metres per second (m3s), litres/sec (l/s), kilograms per
second (kg/sec), pounds per hour (lb/hr), litres/minute(l/min),
Normal cubic metres per hour (Nm3/hr), Standard cubic metres per
hour (Sm3/hr), tonnes per hour (tonne/hr).
 New Zealand Qualifications Authority 2016
NZQA registered unit standard
4.2
Define laws and equations relating to flow measurement and apply to
calculations.
Range
4.3
28077 version 1
Page 3 of 4
Reynolds number, equation of continuity, Bernoulli's equation.
Describe pressure and temperature compensation required on oil, gas and
mass flowmeters.
Range
turbine, vortex, orifice plate.
Outcome 5
Demonstrate knowledge of the physical principles of density measurement.
Evidence requirements
5.1
Define terms and units used in density measurement and perform unit
conversions by calculation.
Range
kilograms per cubic metre (kg/m³), relative density, specific gravity.
Planned review date
31 December 2017
Status information and last date for assessment for superseded versions
Process
Version Date
Last Date for Assessment
Registration
1
28 November 2013
N/A
Consent and Moderation Requirements (CMR) reference
0003
This CMR can be accessed at http://www.nzqa.govt.nz/framework/search/index.do.
Please note
Providers must be granted consent to assess against standards (accredited) by NZQA,
before they can report credits from assessment against unit standards or deliver courses
of study leading to that assessment.
Industry Training Organisations must be granted consent to assess against standards by
NZQA before they can register credits from assessment against unit standards.
Providers and Industry Training Organisations, which have been granted consent and
which are assessing against unit standards must engage with the moderation system that
applies to those standards.
Requirements for consent to assess and an outline of the moderation system that applies
to this standard are outlined in the Consent and Moderation Requirements (CMR). The
CMR 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.
The Skills Organisation
SSB Code 100401
 New Zealand Qualifications Authority 2016
NZQA registered unit standard
28077 version 1
Page 4 of 4
Comments on this unit standard
Please contact The Skills Organisation reviewcomments@skills.org.nz if you wish to
suggest changes to the content of this unit standard.
The Skills Organisation
SSB Code 100401
 New Zealand Qualifications Authority 2016