2026-08-01
For a test record to be traceable to the process that produced it, several questions must be answered: was the site environment measured? Were the pressure and temperature channels verified on site? How is the orifice differential pressure converted into mass flow? And where did the operator leave the marker for this particular test? This note explains the test-platform data workflow in five steps: environment, verification, calculation, operation, and retention.
01 / Environment measurement
Before each test, the team measures the local atmospheric pressure and local temperature. Atmospheric pressure is read with an aneroid barometer; the reading is then corrected according to the instrument's temperature-correction rule using the measured site temperature. This is a reading-level temperature correction and is not equivalent to statutory metrological verification.
The pressure upstream of the orifice plate must be absolute, and gas density depends on the actual temperature and pressure. Recording the local atmospheric pressure and temperature ensures the calculation uses on-site conditions rather than a fixed off-site value.
02 / Channel verification
Before testing, the team performs a two-point linear verification of the pressure and temperature channels used, and the procedure can be completed directly in the test-platform system.
The temperature channel is compared against a standard mercury thermometer at two points — an ice-water mixture and the actual air temperature — to verify and linearly check the Pt1000 platinum-resistance channel. The pressure channel uses a long U-tube as the reference and is verified at two standard points.
Engineering boundary: this is an on-site linear check within the current operating range; it is not a full-range multi-point calibration and does not replace statutory metrological verification or a complete uncertainty assessment.
03 / Standard orifice-plate calculation
The platform uses a standard orifice-plate flowmeter supplied by a specialist manufacturer. The orifice plate is manufactured to ISO 5167 / GB/T 2624, and the manufacturer provides the parameters for this plate, which the system uses for engineering calculation.
Mass flow uses the standard formula without iteration: q_m = [C / √(1 − β⁴)] × ε × (π / 4) × d² × √(2 × ρ₁ × Δp).
The gas expansibility factor is calculated as: ε = 1 − (0.351 + 0.256β⁴ + 0.93β⁸) × [1 − (p₂ / p₁)^(1/κ)]. Temperature determines the on-site gas state and upstream density, local atmospheric pressure establishes the absolute-pressure boundary, and the expansibility factor reflects the compressible behaviour of the gas through the orifice.
Manufacturer orifice parameters, dimension tables, pressure-tap configuration and software parameter mappings remain in internal technical documentation and are not published on this page.
04 / Operation and monitoring
The operator console answers 'what to do now': operators can start, stop, mark points and set variable frequency, and review running data and trends. The monitor console answers 'how the process is changing': connected fields and trends share one view for continuous observation, and trends provide context for later review.
05 / Point-marking and data retention
The point-marking function is complete: positions that must be retained are marked during the test.
Test data are automatically saved to a PostgreSQL database and can be exported to Excel in one click for later review and consolidation.
The team is preparing to generate blower performance and power curves automatically from the consolidated data. Curve generation is currently in preparation and does not represent an established performance guarantee or product specification.
Screen captures and readings on this page are for process illustration only and are not performance, accuracy or test conclusions.