Calibration Checklist
Calibration Checklist
Counting Accuracy
Assurance through Calibration
Counting scales can help you increase productivity and achieve reliable goods control.
Contrary to popular belief, the count value displayed is not always the exact count of the
objects on the scale. Every measuring device has a related uncertainty due to the
counting device’s capabilities, environmental conditions and the weighing process.
The only way to determine the suitability of a measurement for meeting your process specifications, or for
delivering acceptable cost and revenue impact, is to
calibrate the measurement device with a traceable reference standard and to determine accuracy. Additionally, to have traceability in your process, you must
document calibration results and certify that measurements meet quality and regulatory requirements.
Finally, for critical processes or when a measurement
device is used at the low end of its range, it is critical
to determine measurement uncertainty and minimum
reference weight.
Counting Accuracy - Calibration Checklist
Calibration and Certification
You should select calibration and certification services
to meet the objectives of your project, in accordance
with the requirements of your process and to complement the capabilities of your personnel. These recomB
I
A
mended steps provide guidance for specifying the
appropriate calibration and certification services to
meet your objectives. Each step is classified according
to level of difficulty as follows:
Basic – Performed by individuals with knowledge of weighing equipment and concepts
Intermediate – Performed by individuals with specialized know-how of weighing equipment and processes
Advanced – Performed by individuals with training and tools from the equipment manufacturer
Calibration &
Certification
Classification
Recommended Steps
B
I
1.Evaluate / confirm calibration and certification requirements
according to process, quality and regulatory requirements
2.Decide if “As Found” results should be determined and
documented
4.Perform a visual inspection of the weighing system’s
operational condition
x
x
x
5.Select sufficient reference weights of the required class and
tolerance according to the scale classification
Testing
Procedures
“As Found’
Make
Adjustments
Testing
Procedures
“As Left’
Create
Certificate
x
6.Select or record device serial number, model and
metrological details
x
7.Select or record scale owner, location, asset and other
information
x
1.Perform and record results of tests that were determined to
be required
x
2.Perform and record results of the
• Sensitivity Test
• Eccentricity Test
• Linearity Test
• Repeatability Test
x
1.Make any needed adjustments to the scale and terminal in
order to improve weighing performance to meet requirements
x
1.Perform and record results of tests that were determined to
be required
x
2.Perform and record results of the
• Sensitivity Test
• Eccentricity Test
• Linearity Test
• Repeatability Test
x
1.Record comments regarding the condition of the calibration
tests or other relevant information
x
2.Record the next calibration due date
x
3.Calculate measurement uncertainty and minimum weight
values (as required)
4.Print and archive the test certificate
x
x
5.Review test results to ensure that scale is suitable for use
in the required processes and applications
6.Check if re-verification is required
2
METTLER TOLEDO - White
Paper - Bench Scale Service Checklist
My Notes
x
3.Select an appropriate calibration procedure and certificate
type
Preparatory
Tasks
A
x
x
© 2013 Mettler-Toledo, LLC
Counting Accuracy - Calibration Checklist
Your Qualified Service Provider
Contact METTLER TOLEDO to ensure you maximize the return on your investment. Our technicians have the
advanced skill-set to safeguard the life of your weighing equipment through these comprehensive service
offerings:
Calibration and Certificates
METTLER TOLEDO advisors are
experts in global standards and local
and industry-specific requirements.
They can determine the appropriate
frequency and calibration procedures
required to maintain compliance.
MiraCal
METTLER TOLEDO’s calibration
service-management solution is
designed to produce and electronically archive the highest-quality
calibration documentation.
Efficient Lifecycle Management
With GWP®, METTLER TOLEDO performs a comprehensive analysis of
your weighing process and recommends weighing equipment and
the right services.
Preventative Maintenance
METTLER TOLEDO provides the
right level of periodic preventive
maintenance to match equipment
utilization, process criticality and
equipment lifecycle.
METTLER TOLEDO will assist you in determining the key requirements before defining a services program:
• How important is maximizing uptime to your process and business?
• What measurement accuracy will ensure required quality and profitability?
• What are your regulatory, quality and customer compliance requirements?
• How should your equipment be integrated into your process and systems?
• What is the optimal equipment configuration for your process and operation?
• Can your staff safely and productively operate and maintain your equipment?
Benefits of Using METTLER TOLEDO Service:
• Consultation for an optimal service plan to achieve your desired business results
• A global network of factory-trained technicians delivering exceptional service
• A field service force backed by local and global support personnel to provide ideal solutions
• Proprietary service tools to realize and maintain the best performance for your equipment
• Factory maintenance procedures to maximize your return on investment
• Consistent procedures to ensure measurement results that lower costs and increase revenues
• Certification solutions that are compliant with local and global regulations and standards
• Calibration services that are ISO17025 accredited, giving third-party credibility to results
Mettler-Toledo AG
Industrial
CH 8606 Greifensee
Switzerland
Phone +41-44-944 22 11
Fax +41-44-944 30 60
Subject to technical changes
© 03/2013 Mettler-Toledo AG
www.mt.com/service
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