I am just in the process of pulling a faulty one apart, faulty as in
not getting up to pressure so showing an error. They are quite
intricate for what little they cost - there is a tiny compressor,
pressure relief valve, over pressure safety valve, then a pressure
sensor IC unit, mounted on the PCB - which has the usual LCD display,
driver, buttons and rest of the electronics on it.

Then there is the pressure cuff itself, with two air ports, one for air
in, one going to the release valve.

My thinking is it is either the over pressure relief valve (which is
adjustable), pump, or release valve which has failed.

For the cost, not worth bothering to repair and a replacent is on its
way, but just interesting to see what was inside.

On Thu, 07 Sep 2017 12:16:11 +0100, Harry Bloomfield wrote:

I am just in the process of pulling a faulty one apart, faulty as in not
getting up to pressure so showing an error. They are quite intricate for
what little they cost - there is a tiny compressor, pressure relief
valve, over pressure safety valve, then a pressure sensor IC unit,
mounted on the PCB - which has the usual LCD display, driver, buttons
and rest of the electronics on it.

Then there is the pressure cuff itself, with two air ports, one for air
in, one going to the release valve.

My thinking is it is either the over pressure relief valve (which is
adjustable), pump, or release valve which has failed.

For the cost, not worth bothering to repair and a replacent is on its
way, but just interesting to see what was inside.

Mine is getting a bit iffy. When I replace it I shall do the same!



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On 07/09/2017 12:16, Harry Bloomfield wrote:
I am just in the process of pulling a faulty one apart, faulty as in not
getting up to pressure so showing an error. They are quite intricate for
what little they cost - there is a tiny compressor, pressure relief
valve, over pressure safety valve, then a pressure sensor IC unit,
mounted on the PCB - which has the usual LCD display, driver, buttons
and rest of the electronics on it.

Then there is the pressure cuff itself, with two air ports, one for air
in, one going to the release valve.

My thinking is it is either the over pressure relief valve (which is
adjustable), pump, or release valve which has failed.

For the cost, not worth bothering to repair and a replacent is on its
way, but just interesting to see what was inside.


I have two BP monitors and I've found the £20 one from Argos is small
enough to carry around in luggage and in the car and works well. The
problem with a lot of models is the size of the (arm) cuff that comes
with the meter which I guess may be too small for anyone who isn't a
size zero fashion model. The £20 model from Argos comes with a larger
cuff. This BP meter works different in that it records the pressures
whilst inflating the cuff rather than the more traditional way of
inflating the cuff first, releasing the pressure and then taking the
readings on deflation. This cheap meter gives the same results as my
much more expensive model.

http://www.argos.co.uk/product/6167662

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Yes I have a talking one with umpteen memories and a calendar in it.
I don't know how they do it for the cost and its pretty accurate and can
spot problems when the velcro slips.
Brian

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"Harry Bloomfield" wrote in message
news
I am just in the process of pulling a faulty one apart, faulty as in not
getting up to pressure so showing an error. They are quite intricate for
what little they cost - there is a tiny compressor, pressure relief valve,
over pressure safety valve, then a pressure sensor IC unit, mounted on the
PCB - which has the usual LCD display, driver, buttons and rest of the
electronics on it.

Then there is the pressure cuff itself, with two air ports, one for air
in, one going to the release valve.

My thinking is it is either the over pressure relief valve (which is
adjustable), pump, or release valve which has failed.

For the cost, not worth bothering to repair and a replacent is on its way,
but just interesting to see what was inside.

Brian Gaff has brought this to us :
Yes I have a talking one with umpteen memories and a calendar in it.
I don't know how they do it for the cost and its pretty accurate and can
spot problems when the velcro slips.

Mine is now fixed. The over pressure release valve was adjustable and
it had either moved through vibration or the adjustment had slipped. It
was just a screw in the end of the valve, with nothing to make it stay
put. A quarter turn tighter and it now works. There was absolutely
nothing in there, to calibrate, so it must self calibrate using air
pressure as the reference.