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Archive for the ‘Test equipment’ Category

Test equipment.
If you are to run a good maintenance workshop, you will have, at some point buy or acquire some test equipment.
This is essential to the department.
The sort of things that you will need are as follows:

A. An automatic / manual electrical safety checker. Fluke of the USA are worth looking at.

B. Anaesthetic gas analyser, this will tell you if the vaporisers on your anaesthetic machines are giving accurate outputs. Riken of Japan are worth looking at.

C. A range of high quality pressure gauges with an accuracy of around ½ percent, the range should cover all the gauges that you are likely to meet.
Obviously if you want to check the accuracy of a gauge, the one you do it with has to be more accurate than the one you are testing.

D. An oxygen analyser, don’t be tempted to buy the fuel cell type they are like a battery, they slowly run down with time so the fuel cell will seldom be good when you need it and in the long run it will cost you a great deal more, splash out and buy the paramagnetic type, these do not use a fuel cell. Servomex in the UK are leaders in this field.

E. Test flow tubes are worth having, again you will need enough to cover the expected range the you will need, you will want one from say 0 to 1 litre, one from 0 to 20 litres, one from 0 to 100 litres and one that goes to around 300 lpm.
These can be used for all sorts of things apart from checking the calibration of other flow tubes.
They will generally be the same kind as you will find on an anaesthetic machine, with a bobbin or a steel ball inside.
(a scrap anaesthetic machine will provide you with some).

F. Multi meter, for measuring electricity, resistance and current. You can buy the old type on analogue meter as seen in my photo below, this one is the best and very robust it is made by AVO in the UK,

DSCF2208

 

seldom used these days because now everyone uses digital meters as in my  photo below, in this case a Fluke made in the U.S.A.

DSCF2211

 

G. Test probes, these are used to check the wall gas and vacuum outlets. Take a good probe of the outlet you will want to check, turn a piece of Stainless steel bar on the lathe to fit the hole in the end that the tube is attached to, bend it to 45 degrees (so you have something to grip on to), silver braze it into place. Keep them all in a safe place, it is important that they do not get damaged. If someone complains that the outlet is leaking, plug-in your test probe if it doesn’t leak then the problem must lie with the probe of the item being plugged in.
Perhaps it has been dropped and bent slightly.

H. Test set up for the static and dynamic testing of pressure regulators. See section on pressure regulators.

I. An oscilloscope if you are deeply into electronics.

J. An artificial lung for testing ventilators.

Much test equipment, like that above, you can make yourself as you find a need for it.

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