Go Back   Team-BHP > Around the Corner > Shifting gears > Gadgets, Computers & Software


Reply
 
Thread Tools Search this Thread
Old 23rd June 2013, 18:21   #31
Senior - BHPian
 
Join Date: Mar 2007
Location: Mumbai
Posts: 1,444
Thanked: 281 Times
Default Re: Any suggestions for a Blood Pressure measuring machine?

Quote:
Originally Posted by DerAlte View Post
As I wrote earlier, the modern pressure sensors which are the heart of these boxes really don't need recalibration. The servicing will only look for blocks in the air path (with removable straps) and may check for cracks & leakage due deterioration of plastics. At the same time they may compare it with a standard setup.
DerAlte - What I am asking is - where did you get this info - that modern BP Monitors do not need calibration because of above reasons?
carboy is online now   Reply With Quote
Old 24th June 2013, 02:55   #32
BHPian
 
ghpk's Avatar
 
Join Date: Mar 2009
Location: Ghaziabad
Posts: 869
Thanked: 192 Times
Default Re: Any suggestions for a Blood Pressure measuring machine?

I am using "Omron HEM-7111" one since last 2 years and even after too many misleading advices I got before actually buying it,
this small beast certainly has some nice maintenance free system inside.

I clearly remember that Once I was very dizzy and measured and found it to be low, Immediately headed towards a near by doctor and before he used the mercury one on my upper hand was all against the pic I had in cellphone to show him.

But to his surprise I was indeed in "Hypotension BP Range" what my machine showed.
Although I would not deny it being +/-5 mm Hg, but that also depends on your position while measuring it etc etc.

Also Guys be careful why buying this from your fav. chemist, This machine sells for Rs.1000 cheaper than MRP, check the online stores before buying it on huge premium from local chemist.
ghpk is offline   Reply With Quote
Old 24th June 2013, 12:01   #33
Distinguished - BHPian
 
DerAlte's Avatar
 
Join Date: Mar 2007
Location: Bangalore
Posts: 8,076
Thanked: 2,867 Times
Default Re: Any suggestions for a Blood Pressure measuring machine?

Quote:
Originally Posted by carboy View Post
... that modern BP Monitors do not need calibration because of above reasons?
The basic pressure sensor (made by Honeywell, Freescale, Cypress etc.) in your BP monitor is the same as one finds with injection ECUs for sensing altitude (not the O2 sensor in exhaust line). Ever heard of a car being taken to A.S.S. to recalibrate the ECU?
DerAlte is offline   Reply With Quote
Old 24th June 2013, 12:27   #34
Senior - BHPian
 
Join Date: Mar 2007
Location: Mumbai
Posts: 1,444
Thanked: 281 Times
Default Re: Any suggestions for a Blood Pressure measuring machine?

Quote:
Originally Posted by DerAlte View Post
The basic pressure sensor (made by Honeywell, Freescale, Cypress etc.) in your BP monitor is the same as one finds with injection ECUs for sensing altitude (not the O2 sensor in exhaust line). Ever heard of a car being taken to A.S.S. to recalibrate the ECU?
DerAlte - Please understand that I am not trying to disprove you or anything. I know very little about this - hence my questions. And the main reason for my question is because the manufacturers themselves recommend calibration once in a couple of years for light usage & calibration every year for more than 4 readings per day - that's all. And outside India all these manufacturers seem to have a process by which you can send the device back to the company for calibration and pay a nominal amount and get the calibration done.
carboy is online now   Reply With Quote
Old 24th June 2013, 13:05   #35
Distinguished - BHPian
 
DerAlte's Avatar
 
Join Date: Mar 2007
Location: Bangalore
Posts: 8,076
Thanked: 2,867 Times
Default Re: Any suggestions for a Blood Pressure measuring machine?

Quote:
Originally Posted by carboy View Post
... outside India all these manufacturers seem to have a process by which you can send the device back to the company for calibration and pay a nominal amount and get the calibration done.
Maybe 'calibration' is too strong a word for it, but generally all instrumentation theoretically does need a bit of service, whether in industrial use or medical electronics. I say 'theoretically' since maintenance / upkeep is a good practice, but not an absolute must if the usage environment is within expected limits. (I think by saying 'calibration' you mean the same. For me calibration is at a very low level - ensuring X volts output from sensor corresponding to Y bar pressure)

For example, if the electronic sphygmomanometer (BP machine!) were to be kept in direct sunlight or such harsh environment, it definitely would have an effect on the exposed plastic parts, resulting in small cracks or pinholes etc. This would then give wrong readings - from slightly to grossly as the case may be - due to air leakage during pressurization. Now if the instrument has been kept protected, this is unlikely to happen (even plastics have improved over the years). All the BP machines have error detection built-in, so if the pressurization is taking longer than expected (leakage) it will show an error.

Calibration of sensors alone, after all these years (around 30 years or more) of R&D, has either resulted in it not being required all, or at best self-calibration. Pressure sensors are type calibrated (during design cycle), and the equipment / instruments using them is tested against a standard setup after manufacturing. Sending the instrument back to the manufacturer would result in testing against the standard setup.

However, by experience most people know that they can still rely on the readings they have taken by comparing it with the occasional double checking with a doctor's mercury based sphygmomanometer operated by the doctor. For those who want to, the manufacturers have a channel for doing it for them - so that no one can accuse them of "not being conscious on issues of users' health".
DerAlte is offline   Reply With Quote
Old 25th June 2013, 04:31   #36
Senior - BHPian
 
Join Date: Mar 2007
Location: Mumbai
Posts: 1,444
Thanked: 281 Times
Default Re: Any suggestions for a Blood Pressure measuring machine?

I wrote to Omron India and Microlife USA. Both said that even after 5 years, it's highly likely that there would be no problem with the calibration.

Omron India also said that they can do a check of the machine for Rs. 200.
carboy is online now   Reply With Quote
Old 6th July 2013, 16:48   #37
Senior - BHPian
 
Join Date: Mar 2007
Location: Mumbai
Posts: 1,444
Thanked: 281 Times
Default Re: Any suggestions for a Blood Pressure measuring machine?

I bought a 2nd BP machine for my parents just because the older Microlife one is almost 6 years old - but still no problems. The new one is a Omron 7113 from Flipkart for Rs. 1700. Excellent machine and gives the reading faster than the older machine.
carboy is online now   Reply With Quote
Reply


Thread Tools Search this Thread
Search this Thread:

Advanced Search


Similar Threads
Thread Thread Starter Forum Replies Last Post
Measuring fuel economy- KMPL VS Liters/100 kms - Which is better? Pri2 Technical Stuff 42 8th June 2011 17:50
DIY: Testing/Measuring the true power output of your Amplifier. cvc2145 In-Car Entertainment 6 21st December 2009 05:37
The Blue Machine- A 540 converted into my dream machine.. DesertKing 4x4 Vehicles 117 24th January 2009 14:30
Whats is the accurate method of measuring FE Anju Technical Stuff 9 10th December 2007 16:52
Great Article on measuring Horsepower GTO Technical Stuff 4 1st May 2004 00:17


All times are GMT +5.5. The time now is 22:16.

Copyright 2000 - 2017, Team-BHP.com
Proudly powered by E2E Networks