The Cove Business Standards Discussion Forums
Thermohygrometer Calibration - Number of Required Calibration Points
Please read this thread...
Software update
Thermohygrometer Calibration - Number of Required Calibration Points
Go Back   The Elsmar Cove Business Systems and Standards Discussion Forums > > >
Forum Username

Elsmar Cove Forum Visitor Notice(s)

Wooden Line

Thermohygrometer Calibration - Number of Required Calibration Points

Monitor the Elsmar Forum
Courtesy Quick Links


Links Elsmar Cove visitors will find useful in the quest for knowledge and support:

Jennifer Kirley's
Conway Business Services


Howard's
International Quality Services


Marcelo Antunes'
SQR Consulting, and
Medical Devices Expert Forum


Bob Doering
Bob Doering's Blogs and,
Correct SPC - Precision Machining


Ajit Basrur
Claritas Consulting, LLC



International Standards Bodies - World Wide Standards Bodies

AIAG - Automotive Industry Action Group

ASQ - American Society for Quality

International Organization for Standardization - ISO Standards and Information

NIST's Engineering Statistics Handbook

IRCA - International Register of Certified Auditors

SAE - Society of Automotive Engineers

Quality Digest

IEST - Institute of Environmental Sciences and Technology


Some Related Topic Tags
laboratory environmental conditions, thermohygrometer, calibration (metrology) laboratories, calibration (general topics)
Reply
 
Thread Tools Search this Thread Rate Thread Content Display Modes
  Post Number #1  
Old 7th November 2006, 01:04 AM
corollax

 
 
Total Posts: 41
Question Thermohygrometer Calibration - Number of Required Calibration Points

Hi, we have a thermohygrometer which charts our environmental conditions. Our calibration laboratory temperature is controlled at 21±3°C. Question: Is it acceptable to have the thermohygrometer calibrated at only one point (ie. 21°C), or does the calibration requires any minimum set of points (eg. 18°, 21°, 24°). Thanks.

Sponsored Links
  Post Number #2  
Old 7th November 2006, 02:34 AM
Ajit Basrur's Avatar
Ajit Basrur

 
 
Total Posts: 6,214
Re: Thermohygrometer calibration

Quote:
In Reply to Parent Post by corollax View Post

Hi, we have a thermohygrometer which charts our environmental conditions. Our cal lab temperature is controlled at 213C. Question: Is it acceptable to have the thermohygrometer calibrated at only one point (ie. 21C), or does the calibration requires any minimum set of points (eg. 18, 21, 24). Thanks.
I would recommend to go for a 3 point calibration.

Additionally, visit your city statistics information for the highest and lowest values of temp and humidity and accordingly select the high, low and optimum value for calibration.

So, you could use this thermohygrometer in any area within your facility.
  Post Number #3  
Old 7th November 2006, 12:56 PM
Jerry Eldred's Avatar
Jerry Eldred

 
 
Total Posts: 530
Re: Thermohygrometer Calibration - Number of Required Calibration Points

As a metrologist, I have oft been quoted as saying "3 points is a cal." So I would concur with that recommendation.

However, it is not uncommon or unacceptable to do a one point cal. Some brand names of hygrometers in their OEM procedures even give you the option of single point or a variety of multi-point cals.

Whether it is acceptable or not may be a factor of your quality policy. It is a cost/convenience saving to do a single point cal, and may be satisfactory.

However, if you ever have an excursion away from your single point, you have no way to know how accurate your hygrometer (hygrothermograph) is.
  Post Number #4  
Old 7th November 2006, 01:02 PM
chergh - 2008

 
 
Total Posts: 389
Re: Thermohygrometer Calibration - Number of Required Calibration Points

What is going to happen if your calibration labratory falls to 17 C or rises to25C? If the answer is everything needs to stop while it is sorted out you probably want a multi point calibration. If all that is going to happen is an employee goes "brrr...I'm cold" then you could probably get away with a less rigourous calibration.
  Post Number #5  
Old 7th November 2006, 07:48 PM
Hershal's Avatar
Hershal

 
 
Total Posts: 2,498
Re: Thermohygrometer Calibration - Number of Required Calibration Points

Often, a cal lab may cal that type instrument at 50% and 23 C.

I recommend at least two points, three is preferred.....and for RH you low and high end of what you monitor, and one in the middle.....

One other point, make sure to get the uncertainties, and not just a pass/fail.....

Hershal
  Post Number #6  
Old 8th November 2006, 12:08 AM
corollax

 
 
Total Posts: 41
Re: Thermohygrometer Calibration - Number of Required Calibration Points

THANKS to ALL for your replies. I am now convinced we'll need a 3 cal points for thermohygrographs in our lab.

PS. I hope no one will feel I'm using the "Thanks" too indiscriminately!!
  Post Number #7  
Old 8th November 2006, 01:08 AM
Ajit Basrur's Avatar
Ajit Basrur

 
 
Total Posts: 6,214
Re: Thermohygrometer Calibration - Number of Required Calibration Points

Quote:
In Reply to Parent Post by corollax View Post

PS. I hope no one will feel I'm using the "Thanks" too indiscriminately!!
Not at all, thats an appreciaition for the valuable inputs which we get in this Cove.
  Post Number #8  
Old 8th November 2006, 01:31 PM
Hershal's Avatar
Hershal

 
 
Total Posts: 2,498
Re: Thermohygrometer Calibration - Number of Required Calibration Points

Qualityalways is correct.....our hope is to help you succeed.

Hershal
Reply

Lower Navigation Bar
Go Back   The Elsmar Cove Business Systems and Standards Discussion Forums > > >

Bookmarks



Visitors Currently Viewing this Thread: 1 (0 Registered Visitors (Members) and 1 Unregistered Guest Visitors)
 
Thread Tools Search this Thread
Search this Thread:

Advanced Forum Search
Display Modes Rate Thread Content
Rate Thread Content:

Forum Posting Settings
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Emoticons are On
[IMG] code is On
HTML code is Off


Similar Discussion Threads
Discussion Thread Title Thread Starter Forum Replies Last Post or Poll Vote
Number of Calibration Verification Points - Calipers, height gages, etc qu1nn General Measurement Device and Calibration Topics 6 19th June 2014 05:01 PM
Required Complete calibration SOP, calibration Plan and master list template! swapan2u IATF 16949 - Automotive Quality Systems Standard 3 30th September 2011 09:35 AM
Gage pin calibration - Actual calibration readings required on the calibration cert mfr11 General Measurement Device and Calibration Topics 3 9th April 2009 12:58 PM
Calibration required? We buy part of our machined parts - Supplier gage calibration? svance General Measurement Device and Calibration Topics 6 21st February 2007 02:18 PM
Pressure Transducer - Number of Calibration Test Points Charles Wathen General Measurement Device and Calibration Topics 12 16th March 2004 07:18 PM



The time now is 02:50 AM. All times are GMT -4.
Your time zone can be changed in your UserCP --> Options.



Misc. Internal Links


NOTE: This forum uses "Cookies"