TRAINING FOR THE WEIGHTS AND MEASURES OFFICIAL

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TRAINING FOR THEWEIGHTS AND MEASURES OFFICIAL
COURSE CURRICULUM
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TRAINING FOR THEWEIGHTS AND MEASURES OFFICIAL
COURSE CURRICULUM
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TRAINING FOR THEWEIGHTS AND MEASURES OFFICIAL
Module SixField Standards and Test Equipment
Sixth in a series of 14
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General Overview

• This module will introduce you to the types of
  standards and equipment you will use in your
  profession.
• It will also explain the appropriate care and use
  of each.

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Module Objectives
Be familiar with the standards and equipment you
will use
Understand which standards and equipment to use
for a particular application
Know the importance of maintaining and caring for
your test standards and equipment
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Your Standards and Equipment

• What will you use to test commercial weighing and
  measuring equipment?
• A variety of standards and equipment using units
  of

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Your Standards and Equipment
Other handbooks from NIST address inspectors
standards

• design materials construction marking toleran
  ces

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Your Standards and Equipment

• Systems of Weights and Measures Used
• US Customary is the most common
• Gallons, ounces, cubic feet, etc.
• System International (SI) is also legal
• Liters, grams, meters
• Large Metric Standards are rarely used

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Your Image

• Professionalism is Important

Dont use slang terms for your standards
Carry a copy of the certificate of accuracy
Evidence of accuracy is reassuring
Maintain integrity of your equipment standards

• Remember
• Clean Equipment is Accurate Equipment

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Mass (Weight) Standards

• Mass and Weight Are Different
• Mass is quantity
• Weight is force (Force as referenced in Module
  5, Legal Metrology)
• In this module we will treat the terms as
  synonymous

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Mass (Weight) Standards

• There are Many Types of Mass Standards
• Ounces or grams
• Tons and kilograms
• Materials are generally stainless steel or cast
  iron
• NIST Handbook 105-1 discusses mass standards

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Mass (Weight) Standards
Inspectors Weight Kits

• US Customary

Metric
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Mass (Weight) Standards
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Mass (Weight) Standards

• Weight Carts

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Volumetric Standards
Many terms are used for these standards for
uniformity
Standard
Refers to all sizes and types of volume standards
Test Measure
Sizes up to and including 50 liters or 10 gallons
Prover
Sizes larger than 50 liters or 5 gallons
Flask, measuring cylinder, graduate
Generally describes glassware
Cubic Measure
Used for measuring dry products
Avoid using slang terms
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Using Volumetric Standards

• Usually requires reading a meniscus
• Meniscus curve of the surface of a liquid
  confined in a measuring cylinder or sight glass
• Most liquids curve up mercury curves down
• Reading a meniscus correctly is a skill you must
  acquire

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The Meniscus
How you read a meniscus will affect the accuracy
of the measurement
Read the bottom of the curve
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To Deliver or Contain

• Volumetric Standards fall into two types
• To Contain
• To Deliver
• Abbreviations TC, TD or IN, EX are often used

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To Deliver or Contain

• One standard will hold or contain its stated
  volume, the other delivers it
• Each type must be used correctly for accurate
  measurement

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To Contain

• A to contain standard must be clean and dry to
  measure accurately
• When drained after use, liquid residue inside
  reduces the volume
• The next measurement would be in error because of
  the volume of residual liquid

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To Deliver

• These standards are designed to hold in excess of
  their stated volume
• The excess is equal to the residual
• If filled and emptied correctly, it will
  deliver its stated volume
• In a wet condition it will hold its stated volume
• Standard can be reused without drying between
  measurements

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Conditioning a To Deliver Flask

• A to deliver flask must be conditioned or
  wetted down before use
• Flask is emptied in a specific way
• Filled flask emptied during 30 seconds

Then tilted to 80 degrees and drained for ten
seconds
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Temperature Considerations

• Temperature must be considered when making any
  volumetric measurement
• Make adjustments if necessary

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Types of Volumetric Standards

• Volume standards come in many shapes, sizes, and
  forms
• They are generally designed for specific tasks

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Glassware, Graduates and Flasks
Most common for checking quantity of packaged
goods ranging from 2 fl oz (50 ml) to 1 gal (4
L) When smaller volumes are needed, pipettes and
burettes are used Handbook 105-2 discusses
glassware
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Test Measures

• For testing gas dispensers
• 1, 5, or 10 gallon sizes

NIST Handbook 105-3 discusses test measures and
provers
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Test Measures

• Vehicle mounted test measures

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Provers

• Larger volume standards, because of size and
  weight are either static or vehicle mounted

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Bell Prover

• Specialized prover for testing vapor meters
• Kept and used in a temperature controlled
  environment

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Cubic Measures

• Used to measure dry products

Available in convenient sizes
1 cubic foot 1 cubic yard, or metric equivalent
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Precise Volume Measures

• A measure with precise volume is often called a
  pycnometer or density cup
• Used to determine density of viscous fluids
• Weigh product and use density to calculate volume

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Length Standards
Standards of length can take many forms tapes,
rulers, calipers, micrometers, depth gauges,
pre-measured distances, etc.
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Tapes and Rulers

• Tapes

Flexible metal25 100 ft.
Smaller tapes (6 25 ft ) may not havebeen
certified. Be sure to check Fabric tapes are
available to test fabric measuring
devices Decimal tapes with feet divided into
tenths instead of inches are useful for
calculation
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Micrometers

• Used for measuring small distances, up to about ½
  inch

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Calipers

• Used to determine either internal or external
  dimensions

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Depth Gauge

• Used to determine fill level of liquids
• Example Measuring the level of paint in cans

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Distance Simulators

• Used for testing taximeters

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Pre-Measured Distances

• Another method to check taximeters

A Pre-measured Mile
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Fifth Wheel

• Once used for testing taximeters

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Stopwatches
Taximeters
Parking Meters
Verify flow rates of volume meters
Coin Operated Laundry Machines
NIST Handbook 105-5 applies to stopwatches
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Thermometers

• Two principle types
• Mercury-in-glass
• Electronic

NIST Handbook 105-6 applies to thermometers
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Mercury-in-Glass Thermometers

• Two types
• Partial-immersion (left) is immersed to a line
  or graduation
• Total-immersion (right) is designed to be read
  at the mediums surface
• Know which type you are using

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Electronic Thermometers

• May have an analog or digital readout
• Digital is the most common

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Electronic Thermometers

• Sensors can be
• Thermocouple Economical and easy to use
• Thermistor Great accuracy and sensitivity 32F
  to 212F
• Resistance Temperature Detectors (RTD) Are the
  most precise, stable and repeatable

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Electric Watthour Standard

• Standard uses a high precision watthour meter
  and resistors

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Weighing Devices

• Electronic
• Primarily used for package inspection

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Weighing Devices

• Equal Arm Balance
• Is fast, accurate, and reliable
• In use before digital electronic scales
• Still valid for package checking

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Weighing Devices

• Large platform scales with 1000 lb capacity

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Pressure Gauges

• Used when checking compressed gases in cylinders

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Zeltec Octane Analyzer

• Screens gasoline samples
• Results cannot be used to remove product from sale

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Trap Tanks

• False tanks use fill pipe of original tank for
  undercover screening for accuracy of fuel
  dispensers

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Water Finding Paste

• Detects presence of water in fuels
• Changes color in presence of water

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RFI/EMF Producing Equipment

• Electronic devices should not be affectedby
  RFI/EMF interference

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Vapor Recovery Nozzle Tester

• Simulates vehicle gas tank to determine
  vapor,not liquid, is recovered

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Tools and Safety Gear

• Specialized clothing and equipment needed for
• Electric meters
• LPG meters
• Heavy capacity scales
• Chemicals and contaminants
• Dont forget a first aid kit!

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Care of Equipment

• Keep equipment clean
• Store it correctly
• Exercise care when using

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Summary
Familiar with the standards you will use
Know the importance of maintenance
Know which standards are used for what task
Have confidence in their accuracy
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Conclusion
This training module has provided you with a
better understanding of your standards, their
use, and integrity.
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TRAINING FOR THEWEIGHTS AND MEASURES OFFICIAL
This Concludes Module 6Field Standards Test
Equipment