SBS - The best value in QMS software

Controlling Humidity in a Textile Testing Laboratory

A

Abdul Ghaffar

#1
Hi
Iam a new to the forum,i got this link through my best friend Mr Amanbhai.
I have question regarding Control Humidification in Textile Lab which is as per the standard RH 65% +/- 2. (or from 63 to 67 %) and Temperature 21 C +/- 1
Question is that if we are using thermohygro graph for monitering the humidity
and it shows up/below to the given uncertainity like lower value 61-62 % and higher value 68-69% then in this case we deviate from the standard values.
Requesting you please guide me how we can solve this problen even it is some difficult to maintained under given low tolarance values.

Thanks and best reqards
Abdul Ghaffar
 
Elsmar Forum Sponsor
D

Dale D. Barnes

#2
Re: Control humidification in Lab

Abdul,
I had a similar problem with my lab. I was trying to control the temperature at 68 degrees F. plus or minus 2 degrees and humidity at 40%RH plus or minus 10%RH. I started having problems controlling both aspects especially humidity. I bought a Dayton 65pint dehumidifier and set it on 40%rh. The model I bought has a temperature reading and RH reading. I am able to control my humidity within plus or minus 2% and my temperature stays on 68 degrees F. constantly. This unit is capable of being hooked up to a hose for automatic draining or you can use the bucket. When I first got the unit I had to use the bucket until I got the hose hooked up. I would empty the bucket twice a day. (close to 6 gallons a day of water it would pull out of the air)
The cost is inexpensive at about $250.00 USD.

Hope this helps
Dale
 

Jerry Eldred

Forum Moderator
Super Moderator
#3
Re: Control humidification in Lab

If I understand correctly, it sound like the issue is that perhaps your measuring instrument is not accurate enough for your requirement. Many of the hygrothermographs (such as Newport, Dickson, Omega, etc.) have accuracies of +/-2%RH or sometimes more. There are some high accuracy instruments available. But since this is not a commercial website, I don't want to recommend specific companies.

Regarding the uncertainty issue, You could use a higher accuracy instrument and set your control limits to include the uncertainty. In the semiconductor industry, we used to do that a lot -- If we had a product limit, we woulld set control limits with smaller limits. When ever our control limits were exceeded, we had an out-of-control action plan (what was the product impact). Our control limits were set small enough so that we almost never exceeded product tolerance limits.
 

BradM

Staff member
Admin
#4
Re: Control humidification in Lab

Jerry's post is a good one. In addition to the accuracy of the measuring instrument, there is the basic consideration of whether the room and the environmental control equipment can even monitor/maintain those considerations.

Also, where you locate your measuring equipment should be considered. If it is by a door or high-traffic area, everyday movement might unduly affect your readings.
 
A

Abdul Ghaffar

#6
Re: Control humidification in Lab

If I understand correctly, it sound like the issue is that perhaps your measuring instrument is not accurate enough for your requirement. Many of the hygrothermographs (such as Newport, Dickson, Omega, etc.) have accuracies of +/-2%RH or sometimes more. There are some high accuracy instruments available. But since this is not a commercial website, I don't want to recommend specific companies.

Regarding the uncertainty issue, You could use a higher accuracy instrument and set your control limits to include the uncertainty. In the semiconductor industry, we used to do that a lot -- If we had a product limit, we woulld set control limits with smaller limits. When ever our control limits were exceeded, we had an out-of-control action plan (what was the product impact). Our control limits were set small enough so that we almost never exceeded product tolerance limits.
You are right. I believe that the tolerance limit set maybe too tight, we go out of the limits very frequently. But like my Manager says long as it goes out of the limit momentarly it is alright.
 
H

HarrySen

#7
Nice discussion going on! I may be late but for future viewers, this might help ! This has info. on humidifiers ---> xxxx
Thanks for letting me in!
 
Last edited by a moderator:

tony wardle

Registered Visitor
#8
Also a bit late - but, the way we sorted our issue out was to use a conditioning cabinet.

In textiles they have to pre condition a samples at a set temp / RH for mass and test in a controlled environment.

The conditioning takes at least 4 hours, so for a 30 lab minute test where the environment may be out by 1- 2% or 1 - 2 degress, the result will be acceptable, and the UOM would take this into account anyway.
 

LUV-d-4UM

Quite Involved in Discussions
#10
Hi
Iam a new to the forum,i got this link through my best friend Mr Amanbhai.
I have question regarding Control Humidification in Textile Lab which is as per the standard RH 65% +/- 2. (or from 63 to 67 %) and Temperature 21 C +/- 1
Question is that if we are using thermohygro graph for monitering the humidity
and it shows up/below to the given uncertainity like lower value 61-62 % and higher value 68-69% then in this case we deviate from the standard values.
Requesting you please guide me how we can solve this problen even it is some difficult to maintained under given low tolarance values.

Thanks and best reqards
Abdul Ghaffar
Apologize for indruding this unfamiliar space. But do you calibrate your Thermo hygrometer? If so what is the tolerance? If this parameter is critical to your testing, then you have to increase the frequency of calibration or buy a new measuring equipment. I've seen this type of equipment in the diagnostic lab and there is a calibration schedule on the label. I hope this helps. This is just my own opinion.
 
Thread starter Similar threads Forum Replies Date
J Controlling Temperature and Humidity in the CMM Room and does anyone use Artifacts? Inspection, Prints (Drawings), Testing, Sampling and Related Topics 8
R Controlling Quick Reaction Checklists Document Control Systems, Procedures, Forms and Templates 1
C Identifying and Controlling External Documents Document Control Systems, Procedures, Forms and Templates 3
qualprod Controlling documents in two different Applications ISO 9000, ISO 9001, and ISO 9004 Quality Management Systems Standards 10
M AS9100d Controlling External Provided Processes (purchasing 8.4) - The customer want us to use supplier X AS9100, IAQG, NADCAP and Aerospace related Standards and Requirements 3
qualprod Minor non-conformance for not controlling local regulation laws? ISO 9000, ISO 9001, and ISO 9004 Quality Management Systems Standards 20
Q Controlling Multi-Tab Microsoft Excel Forms Excel .xls Spreadsheet Templates and Tools 5
C Controlling Software Versions that are part of a medical device IEC 62304 - Medical Device Software Life Cycle Processes 2
A ISO 13485 - Controlling Production and Service Provision - Product Catalogues ISO 13485:2016 - Medical Device Quality Management Systems 3
M Difficulties Controlling Foreign Suppliers Supplier Quality Assurance and other Supplier Issues 8
R OHSAS 18001:2007 Section 3 - Controlling Work Place Risks Occupational Health & Safety Management Standards 3
T Controlling an Excel Spreadsheet (Database) ISO 9000, ISO 9001, and ISO 9004 Quality Management Systems Standards 3
C ISO 9001:2008 4.2.3(f) - Controlling Documents of External Origin Quality Manager and Management Related Issues 9
M Controlling Flow Charts that are hung in workplace. Quality Manager and Management Related Issues 6
N Controlling Records query that may cause some serious trouble for me ISO 9000, ISO 9001, and ISO 9004 Quality Management Systems Standards 8
T Controlling Manual - Control of 10 Printed Manuals throughout our 9 Branches Document Control Systems, Procedures, Forms and Templates 8
Fender1 Controlling Documents and Records in a Custom Weld/Fabrication Company Document Control Systems, Procedures, Forms and Templates 10
C Tool Monitoring - Controlling a Process with Better Tool Monitoring Manufacturing and Related Processes 4
C Controlling QMS - We are expanding globally and want to keep our QMS Confidential Quality Manager and Management Related Issues 20
C Controlling Documents: Beyond the standard, how do we truly define what to control ISO 9000, ISO 9001, and ISO 9004 Quality Management Systems Standards 9
R Referencing and Controlling Labels & Stickers used internally throughout Production Document Control Systems, Procedures, Forms and Templates 1
Q Controlling Prints in Shop - Audit Finding Question ISO 9000, ISO 9001, and ISO 9004 Quality Management Systems Standards 4
L Controlling "Stamps" used throughout our processing Records and Data - Quality, Legal and Other Evidence 16
T Requirements - Controlling and Maintaining Sheet Metal Templates for Production Use ISO 9000, ISO 9001, and ISO 9004 Quality Management Systems Standards 5
P Controlling Solidworks model, CAD & Gerber files Document Control Systems, Procedures, Forms and Templates 3
M Defining and Controlling External Documents (Documents of External Origin) Quality Tools, Improvement and Analysis 5
M Controlling Temperature and Time - Do I need to calibrate the thermostat? IATF 16949 - Automotive Quality Systems Standard 4
S Controlling Documentation - Which procedures to control Document Control Systems, Procedures, Forms and Templates 12
C HACCP in Egg Production - Controlling hazards at the farm level Food Safety - ISO 22000, HACCP (21 CFR 120) 6
M Controlling Data Labels on Graphs - Number of Decimal Places Reported - Minitab Using Minitab Software 7
I Controlling Minitab by vba (visual basic) or vb Using Minitab Software 6
T Procedure for "Controlling Nonconformity" for a software company Document Control Systems, Procedures, Forms and Templates 2
R Controlling and monitoring of measuring devices - AS9100 General Measurement Device and Calibration Topics 3
D Establishing and controlling process capability - Meaning of Phrases Capability, Accuracy and Stability - Processes, Machines, etc. 2
E Controlling CNC Machine Programs - Your recommendations appreciated Manufacturing and Related Processes 12
T Controlling filled out "forms" (eg Operator job specific work instructions) Document Control Systems, Procedures, Forms and Templates 3
B Controlling Reference Material Document Control Systems, Procedures, Forms and Templates 1
R Procedure for Controlling Transmitted Technical Data - ITAR compliance Document Control Systems, Procedures, Forms and Templates 18
S Identifying and Controlling External Documents Document Control Systems, Procedures, Forms and Templates 8
Raffy Controlling Handler, Tester, Computer and other Equipment Manuals. Document Control Systems, Procedures, Forms and Templates 2
H Controlling Continuously Changing Forms IATF 16949 - Automotive Quality Systems Standard 12
W Controlling Revisions of External Documents - Documents of External Origin Document Control Systems, Procedures, Forms and Templates 10
M Polyurethane Foam Testing and Controlling the Foaming Process Manufacturing and Related Processes 6
G Controlling a male 6% Luer with permanent collar according to EN1707? General Measurement Device and Calibration Topics 5
C Controlling External Customer Documents (Documents of External Origin) Document Control Systems, Procedures, Forms and Templates 5
L "Document Controlling" Queries run to obtain information reported to customer Document Control Systems, Procedures, Forms and Templates 7
A Still Confused About "Controlling Suppliers Records" AS9100, IAQG, NADCAP and Aerospace related Standards and Requirements 3
A Controlling the records of suppliers - AS9100 Rev B Clause 4.2.4 AS9100, IAQG, NADCAP and Aerospace related Standards and Requirements 2
S Controlling external processes - Alternatives ISO 9000, ISO 9001, and ISO 9004 Quality Management Systems Standards 3
K Controlling Forms made in word .doc, excel .xls, and lotus Document Control Systems, Procedures, Forms and Templates 14

Similar threads

Top Bottom