Per ASME PTC 19.2, a Fixed system’s total uncertainty (at 95% confidence) is:

For a fixed pressure measurement system to comply with ASME PTC 19.2, the physical installation—often referred to as the sensing line or impulse piping—must follow specific geometry rules. To avoid errors caused by fluid dynamics or gravity, the standard highlights several critical factors. Sensing lines should be as short as possible to reduce response lag. They must be sloped correctly to prevent gas pockets in liquid lines or liquid traps in gas lines. Additionally, the use of high-quality isolation valves and manifolds is required to facilitate zero-checks without disturbing the process flow. Mitigating Measurement Errors

A permanently installed pressure sensing system, including all impulse lines, manifolds, transmitters, and displays, that is not intended for removal or replacement during normal operation or during a performance test.

The document is structured to guide engineers through every phase of pressure measurement: Pressure Standards

Using a standardized code like PTC 19.2 creates a "level playing field" for both manufacturers and users. By following these uniform rules, both parties can be confident that the test results represent the highest level of accuracy possible given current engineering knowledge. Conclusion Performance Test Codes - ASME

Yes. ASME B40.7 covers the construction and performance requirements for deadweight testers, while ASME PTC 19.2 covers their use in calibration procedures.