I would like to ask about the selection of standard tables for building codes

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This post was last edited by krlf on 2017-1-23 at 22:36. Regarding the calibration of pressure gauges and pressure transmitters, instead of using modules for selecting standard instruments, it is planned to use digital pressure gauges with an accuracy class of 0.05 as the standard instruments. The range of the instrument to be calibrated is -0.1–60 MPa. In order to use as few standard gauges as possible (as the cost of a full set of them is too high), I calculated based on the fact that the allowable error of the standard gauges should be 1/4 of that of the instrument under calibration. As a result, I selected the following ranges: -0.1–0, 0–250 KPa, 0–600 KPa, 0–1.6 MPa, 0–4 MPa, 0–10 MPa, 0–60 MPa. Will these standard gauges be sufficient to meet the requirements of calibrating this instrument? In this case, when calibrating a 0-25MPa pressure transmitter of class 0.5 using a standard gauge in the 0-60MPa range, the maximum allowable error of the standard gauge is set at 0.03125MPa; whereas the allowable error for that standard gauge is 0.03MPa. Isn’t that a bit too tight?