Jewelry vs. Normal Laboratory Balances - Accuracy and calibration

#1
Hi GUYS
I work in pharmaceutical company. It would be a great help if someone could tell me the difference between jewelry and normal lab. balances regarding Accuracy and calibration. Some mix-up during ordering some balances and the ones that we got (pharmaceutical co.) are mettler jewelry balances. Is it Ok to use them after in-house Cal.? Is there any guideline prohibiting using them in pharmaceuticals?
Thank you All in Advance.
 
Last edited:
Elsmar Forum Sponsor

Ninja

Looking for Reality
Trusted Information Resource
#2
To a large degree, the difference is in INTENDED use...not in function.

If it mesures what you need to measure, and does so as accurately and repeatably as you need...there's no issue.
(Accuracy by calibration, of course).

If there is any doubt, which there seems to be since you have posted, be sure to calibrate and verify/validate across the entire range of the balance to put your mind at rest.

The only thing that I would take care for is if they are PORTABLE jewelry balances...some customers, especially automotive, require recalibration if the balance is moved...and portable gets sticky pretty quick.

Due to the intended uses for a jewelry balance, they sometimes lack functions often needed by a laboratory (access doors, change of weighing pan, etc.) Check to make sure you can do everything you need to do on the scale ...

HTH
 

dwperron

Trusted Information Resource
#3
The biggest difference with your jewelry scale is that it is most probably "Legal for Trade" or NTEP approved. Here is a brief explanation:

NTEP stands for National Type Evaluation Program, which is a non-profit corporation. Scales and other weighing equipment that are NTEP approved have been tested and evaluated to ensure they meet all government standards and requirements. The government standards are set by the NIST (National Institute of Standards and Technology), and are listed in their NIST Handbook 44 The NIST standards cover every aspect of an NTEP approved scale from capacity, accuracy, effects on the scale from temperature and humidity, and even how the manufacturers label is to appear on the scale. It is the standards in the NIST Handbook 44 that your local Weights and Measures inspector(s) will typically use when inspecting your scale and certifying it for use. Each NTEP approved scale will have an NTEP certificate or conformance number listed on it so that your local inspector can obtain a copy of the conformance certificate, and verify that the brand and model of your scale was manufactured within NIST standards.

These scales meet the requirements for commercial sales, there is no problem in using them for other purposes as well. There is no reason why they cannot be calibrated in house as long as you are not using them commercially.
 
Thread starter Similar threads Forum Replies Date
T Applying design/development requirements to my inspiration design likes jewelry. Design and Development of Products and Processes 1
P ISO 9001 Implementation and Applicability in the Gem and Jewelry Business ISO 9000, ISO 9001, and ISO 9004 Quality Management Systems Standards 4
E Normal Condition Hazards in Risk Analysis ISO 14971 - Medical Device Risk Management 3
adir88 Tools for Normal and Fault Conditions ISO 14971 - Medical Device Risk Management 9
0 Interesting Discussion Analysis of half normal distribution in minitab Using Minitab Software 11
qualprod What is the Normal Flow in an ERP for Manufacturing? Manufacturing and Related Processes 0
A Touch current in single fault conditions test and earth leakage current in normal conditions test, are they really different tests? IEC 60601 - Medical Electrical Equipment Safety Standards Series 8
D Do we need normal data for gage r&r studies? Gage R&R (GR&R) and MSA (Measurement Systems Analysis) 5
L How to evaluate the process capability of a data set that is non-normal (cannot be transformed and does not fit any known distribution)? Capability, Accuracy and Stability - Processes, Machines, etc. 12
R Non Normal Data in a historically normal process Capability, Accuracy and Stability - Processes, Machines, etc. 6
N Apply control limits to a non-normal distribution Statistical Analysis Tools, Techniques and SPC 13
Q What is the difference between normal and licensed internal auditor? VDA Standards - Germany's Automotive Standards 9
J Is a stable process also normal at the same time? Manufacturing and Related Processes 7
R Non-normal Distribution Selection where the system is constantly being corrected Capability, Accuracy and Stability - Processes, Machines, etc. 11
J Is My AS9100 certification Auditor Normal? Registrars and Notified Bodies 9
Y Process Capability for Non-Normal Data - Philosophical Questions Capability, Accuracy and Stability - Processes, Machines, etc. 6
D Interpreting Normal vs Weibull Capabilities Capability, Accuracy and Stability - Processes, Machines, etc. 4
P Should Data be Normal before Computing Baselines? Statistical Analysis Tools, Techniques and SPC 4
Q Is it normal practice to lubricate Ring Gages before use? General Measurement Device and Calibration Topics 17
A Not all characteristics follow a Normal Distribution - How do you do SPC Chart Capability, Accuracy and Stability - Processes, Machines, etc. 5
A Is normal for FORD EU ask for the PSW every year APQP and PPAP 5
V Process Capability for parameters with non-normal distribution. Capability, Accuracy and Stability - Processes, Machines, etc. 16
P Non-normal Data Cpk Statistical Analysis Tools, Techniques and SPC 5
S Non-Normal Data - Measurement for "straightness" with a 0.001" max tolerance Capability, Accuracy and Stability - Processes, Machines, etc. 10
D Calculating Cpk on Non-Normal Data Distribution Capability, Accuracy and Stability - Processes, Machines, etc. 10
J Non-Normal Distribution Data - Tolerance Intervals and Minitab Using Minitab Software 7
J Can Normal Probability Paper and GPC be created with Excel Gage R&R (GR&R) and MSA (Measurement Systems Analysis) 1
M t-test with Non Normal Data Statistical Analysis Tools, Techniques and SPC 16
T Normal Distribution Test for Cpk (Minitab) Six Sigma 6
U Theory and Practice Behind Expecting a Distribution for my Data (specially the normal Statistical Analysis Tools, Techniques and SPC 48
K Computing Cpk with out determining if my data is normal Capability, Accuracy and Stability - Processes, Machines, etc. 7
L Should Internal Audit CAPAs be kept separate from "normal" CAPAs? ISO 13485:2016 - Medical Device Quality Management Systems 6
A Handling Normal Capacitor Production Fallout AS9100, IAQG, NADCAP and Aerospace related Standards and Requirements 2
K Non-Normal Data Analysis Literature, Websites, Books for Learning Quality Tools, Improvement and Analysis 2
M Is it possible to get Natural Tolerance (Tn) with Non Normal Distribution? Statistical Analysis Tools, Techniques and SPC 9
B Is this Data a Normal Distribution? Statistical Analysis Tools, Techniques and SPC 10
L "Half Normal Plot vs Normal Probability Plot" of Effects Using Minitab Software 1
R Drawing a Normal Plot of the Effects for Multilevel Factorial Design Using Minitab Software 3
B Test of Means or Medians for Non Normal Populations? Using Minitab Software 6
B Is it normal for a procedure to begin with a conditional directive? (if statement) Document Control Systems, Procedures, Forms and Templates 30
S Relationship between Normal Distribution and AQL AQL - Acceptable Quality Level 13
R Transforming or not Transforming - Dealing with Non-Normal Data Statistical Analysis Tools, Techniques and SPC 10
O Which role plays Inverse cdf of a Standard Normal Distribution in Formula for Z-Bench Using Minitab Software 8
optomist1 Non-Normal Data F test and T test Capability, Accuracy and Stability - Processes, Machines, etc. 19
2 Medical Device Hazard Risks - Normal Use Risks vs. Faulty Use Risks ISO 14971 - Medical Device Risk Management 4
P Approved Suppliers - ISO 13485 Normal Supplier Qualification Process Requirements ISO 13485:2016 - Medical Device Quality Management Systems 9
S "Normal" vs. "Between/Within" Capability Analysis Capability, Accuracy and Stability - Processes, Machines, etc. 2
S Which Normality Test more acceptable to FDA; Also, Non-Normal Threshold? Qualification and Validation (including 21 CFR Part 11) 5
T Is Cpk Analysis only for Data that came from Normal Distribution? Capability, Accuracy and Stability - Processes, Machines, etc. 7
M Non-Normal Data & Minitab Statistical Analysis Tools, Techniques and SPC 17

Similar threads

Top Bottom