EBME Forums Forums Maintenance Test Equipment Pressure calibration syringe

If you click on "calibration syringe" in my earlier post it takes you to a US site that is currently selling said article...

but its not cheap, then these "one offs" never are.

Or (probably better) the OEM.

Not so sure about "one offs" ... every biomed workshop should have something like a DPM-1B ... even if it's a "home grown" version (see Richard's opening post).

Maybe you meant "all biomed test equipment" (is expensive), Malcolm. "Biomed" being a relatively small market, I suppose.

Meanwhile ... which one is the most "sought after":- the Delta-Cal or the Veri-Cal (or both)?

My understanding (?) is that the Delta-Cal can verify and calibrate pressure transducers; it can apply pressure whilst the Veri-Cal only tests accuracy.

There is a nice YouTube video showing the Delta-Cal in use.

It would be interesting to hear @brompton's views on all this.

In my opinion, the only advantage of the DPM-1B is that the micro-adjusting pump is integrated into the pressure gauge.The key point is its mechanical fine-tuning pump.It is not excellent for the digital pressure gauge and mechanical potentiometer zero adjustment device on the upper part,Only "mmHg" is displayed,Mechanical potentiometer zero adjustment is not user-friendly and its service life is not expected to be long.
If biomedical engineers only use it for NIBP calibration, DPM-1B is fully sufficient,However, in actual work, in addition to "NIBP" calibration, other medical equipment such as ventilators and anesthesia machines also need calibration and maintenance.And they are usually displayed as "CMH2O or PSI" etc.

What I am most interested in is the mechanical voltage regulation part of DPM-1B.If this part can be separated into a separate mechanical attachment,and use our most readily available syringes,Regardless of any pressure adjustment, it is always used for fine-tuning at the end.Then this enhanced attachment has practical value.

Hi

I've found a 3D printed model that seems to be a better alternative. Please see the link below.


https://makerworld.com.cn/zh/models...fen-pei-qi?from=search#profileId-1248623

Yes; that's the sort of thing ... although the thread pitch may need to be a bit finer for our purposes.

Some years ago, back when plastic item "printing" became a thing, I was looking forward to whole "libraries" (databases of STL files) of printable plastic parts becoming available. With regard to medical equipment, so far I haven't noticed any evidence of this. Would it be too cynical to wonder if the Big Players in the medical equipment world have jumped on such a possibility?

In parts of the world where "Regulations" are often lightly enforced (indeed if such exist at all) - that is, most of the world - many old and "much loved" items of equipment could well be brought back to life by replacement of worn-out, broken, or missing plastic parts.

If I were forty years (or more) younger, I would be tempted to set up somewhere suitable and "have a go"!