digital manometer calibration

darking · Dec 6, 2011

So there you have it halsoweni, I may have a bus pass but I haven't let life pass. I'll show you mine if you show me yours

Halesowen1 · Dec 6, 2011

So there have what?
Pass on that invitation, thanks.

Halesowen1 · Dec 6, 2011

Pssst said:
I'm not sure its a matter of trust. Its just using the right tool for the right job IMHO.

My gauges..well they are simple devices but i treat them as precision instruments. I periodically strip them, clean them,flush them through with bleach and water and reassemble them. In this way they remain highly readable. I ensure they are vertical when read and i use a bright LED portable torch to read them where necessary.

As for combustion analysers..well my comparison was made with draegar pumps and tubes. If you have ever used them,you will know that there is greater scope for error both in use and interpretation of results and because of this,they have largely been superseded.

Now then..if we go back to your simple low pressure water gauge,,,if it is well maintained...a simple job to do...then when its reading 20mb..the chances are that it is indeed reading 20mb or as close as makes no difference.

However, if you attach a digital guage..to the same pressure source and it read 23mb...how would you know if it was wrong or right?..you see, as long as there are no obstructions in the flow path of the u gauge and it only contains water..it IS going to read 20mb gauge pressure.

There is also the whole issue of reading differential pressures and more than one pressure..do you buy 2,3 or more electronic gauges..? It can get pricey.

If i had any doubt about let by..i;d disconnect and use LDF and/or a gas detection instrument.

Still ,each to their own

i must be old school...

The tpi 621 which I and others on here use, do read dual differential pressures up to + or - 300mb. Plus kPa, psi, in Hg, mmHg, mmH2O, inH2O. So more than enough for the domestic gas work I do.