SBS - The Best Value in QMS software

Calibration of Pressure Gauge, How to Determine Calibration Tolerance

A

aufa_fadhli

#1
Hi All,

My company just buy new digital pressure with regulator. It can use unit Kpa and mmHg. the pressure range is 0~100 for kpa and 0~750 for mmHg

In the process we use mmHg unit and we use 150mmHg as constant setting.

Here are my questions?
1. how to determine the calibration tolerance when the process tolerance is constant (fix)?
2. How to calibrate this equipment?

Thank You
Aufa
 
Elsmar Forum Sponsor

Ninja

Looking for Reality
Staff member
Super Moderator
#2
Howdy,

There are typically two ways to choose a calibration tolerance...factory, and need.

For a pressure gage (which is part of the regulation system), I would almost always use an outside service for calibration...simply ask if the service can calibrate pressure gages to the needed range before engaging their services.

1. Factory: If you don't tell the calibration company what your acceptance criteria are, they will typically judge against manufacturing tolerances...it works as new, or it fails. While this is fine if it passes...it can be expensive if the gage fails but still meets your needs.

2. Need: You leave the gage at 150mmHg all the time...but what does your process actually NEED? Will your process still run fine at 140mmHg? 180mmHg?
Basing calibration acceptance criteria on what actually matters to your process is a more effective way to judge if the gage is good enough.

Example: Factory acceptance as new requires +/- 1mmHg accuracy.
Your process needs +/- 20mmHg.
- Your gage meets factory specs...great, move on.
- Your gage cannot hold +/- 30mmHg reliably...fail, get a new gage.
- Your gage holds +/- 2mmHg, no better.
In this third situation, using factory settings as your criteria means you have to buy a new gage...but your real process needs dictate that the gage is still fine for that use.

Note that I used a 10:1 accuracy:need ratio.
If your process needs +/- 20mmHg, and your gage can only hold +/- 15mmHg, you may be tempted to use it...but you'd be better off getting a new gage...

HTH
 
Thread starter Similar threads Forum Replies Date
S Pressure Gauge Calibration Uncertainty Calibration and Metrology Software and Hardware 5
V Analog Pressure Gauge Calibration - smallest resolution practice General Measurement Device and Calibration Topics 12
J Pressure Gauge Tolerances after Calibration General Measurement Device and Calibration Topics 5
W Pressure Gauge Calibration Procedure needed General Measurement Device and Calibration Topics 3
R Looking for calibration specification for Fluke 7250 pressure controller General Measurement Device and Calibration Topics 5
D Calibration and Tolerance Ranges of Pressure Gages General Measurement Device and Calibration Topics 8
K ASME BPVC (Boiler & Pressure Vessel Code) Calibration Requirements General Measurement Device and Calibration Topics 6
W Pressure Calibration to psiA (psi Absolute) General Measurement Device and Calibration Topics 8
W Pressure Transducer Calibration Standards General Measurement Device and Calibration Topics 6
N Calibration Certificate Requirements for Pressure Gauges General Measurement Device and Calibration Topics 9
M Manufacturing Equipment Pressure Gages Calibration Requirements ISO 9000, ISO 9001, and ISO 9004 Quality Management Systems Standards 30
G Calibration of Temperature, Pressure Displays of Molding Machines General Measurement Device and Calibration Topics 13
C Setting up Pressure Calibration In-House Lab General Measurement Device and Calibration Topics 7
O Calibration Supplier needed for Digital Temperature/Pressure Controllers General Measurement Device and Calibration Topics 6
C Pressure Transducer - Number of Calibration Test Points General Measurement Device and Calibration Topics 12
B Injection Molding: Pressure, Time, Temperature and Calibration General Measurement Device and Calibration Topics 7
B Published standards dealing with calibration of pressure and vacuum gauges? General Measurement Device and Calibration Topics 5
V Calibration of Temperature and Pressure Controller General Measurement Device and Calibration Topics 1
D Calibration of pressure/air gages General Measurement Device and Calibration Topics 1
M Calibration of equipment IATF 16949 - Automotive Quality Systems Standard 2
Q Gage calibration / tracking software General Measurement Device and Calibration Topics 2
C Should resolution be included in uncertainty budget for digital caliper or micrometer calibration? Measurement Uncertainty (MU) 4
S Calibration Due date-Critical Connie General Measurement Device and Calibration Topics 16
Q Request Calibration Info Calibration and Metrology Software and Hardware 16
R Calibration Log - Archive Manufacturing and Related Processes 2
U Calculate acceptance of equipment reading after calibration General Measurement Device and Calibration Topics 2
D Question on Documented Calibration versus ISO 17025 Accredited Calibration ISO 13485:2016 - Medical Device Quality Management Systems 2
U Calculate acceptance of calibration reading Measurement Uncertainty (MU) 1
D Air hood calibration ISO 13485:2016 - Medical Device Quality Management Systems 1
K Ground Bond Test for Class I Medical Electrical Equipment - calibration problems IEC 60601 - Medical Electrical Equipment Safety Standards Series 2
E Calibration/Verification Report Durometer ISO 17025 related Discussions 2
S Medical device equipment calibration Qualification and Validation (including 21 CFR Part 11) 1
J Scrap Material Scale Calibration Required? IATF 16949 - Automotive Quality Systems Standard 21
S 7.1.5.2.1 Calibration/Verification Records IATF 16949 - Automotive Quality Systems Standard 6
K Is Calibration Required for Non-Adjustable Commercial Inspection Devices? General Measurement Device and Calibration Topics 11
F Calibration in GPC/SEC General Measurement Device and Calibration Topics 1
Q Changing calibration frequency Calibration and Metrology Software and Hardware 18
M IATF 16949 SI # 10: Integrated self-calibration of measurement equipment- Needs for explanation IATF 16949 - Automotive Quality Systems Standard 2
M Storing Calibration Certificate Document Control Systems, Procedures, Forms and Templates 7
B Risk analysis for defective measuring or measuring equipment out of calibration General Measurement Device and Calibration Topics 2
S Placing a calibration sticker with someone other than your initials Records and Data - Quality, Legal and Other Evidence 8
J IATF 16949 Calibration/Verification records question ISO 26262 - Road vehicles – Functional safety 6
M Approval of Calibration Certificates General Measurement Device and Calibration Topics 1
lanley liao Question regarding the calibration of monitoring and measure equipment. Oil and Gas Industry Standards and Regulations 3
N IATF Calibration Lean in Manufacturing and Service Industries 5
Q Do these certificates of calibration meet ISO 9001 requirements for traceability to NIST? ISO 9000, ISO 9001, and ISO 9004 Quality Management Systems Standards 23
T Plug Gage Calibration Calibration and Metrology Software and Hardware 1
M Load Cell Calibration using a totalizer on a flow meter General Measurement Device and Calibration Topics 0
E Calibration Records needed ISO 9000, ISO 9001, and ISO 9004 Quality Management Systems Standards 1
D Limited Range Calibration - 5000 lb Industrial floor scale General Measurement Device and Calibration Topics 3

Similar threads

Top Bottom