Molbox 1 A700K — Drift Analysis
Drift analysis and trend monitoring for Molbox 1 A700K.
Assessment
TODO: Review drift history and write metrological assessment.
Internal Specification: Analyt MTC — identical to manufacturer spec (Fluke as-found with 1-year drift)
Manufacturer Specification: Fluke Calibration certificates 1500149737 (2013) and 1500224220 (2017) — pressure: max(0.01% rdg, 0.003% of 700 kPa FS) + 0.005% FS/year; resistance: ±0.04Ω (±0.05°C for one year)
Pressure Downstream (mbar)
| Setpoint (mbar) | 2010 | 2011 | 2012 | 2013 | 2014 | 2015 | 2016 | 2018 |
|---|---|---|---|---|---|---|---|---|
| Adjusted | Yes | Yes | Yes | Yes | Yes | Yes | — | Yes |
| As-found Dev/Spec — measured error normalized to internal specification | ||||||||
| 200 | — | — | — | -0.64 | -0.28 | -0.67 | — | — |
| 350 | — | — | — | — | — | — | -0.46 | -0.69 |
| 550 | — | — | — | — | — | — | -0.37 | -0.55 |
| 1000 | — | — | — | -0.24 | +0.18 | -0.17 | — | — |
| 1100 | — | — | — | — | — | — | -0.20 | -0.28 |
| 1650 | — | — | — | — | — | — | -0.13 | -0.14 |
| 2000 | — | — | — | -0.13 | +0.27 | -0.12 | — | — |
| 2200 | — | — | — | — | — | — | -0.15 | -0.09 |
| 2750 | — | — | — | — | — | — | -0.18 | -0.10 |
| 3000 | — | — | — | -0.16 | +0.17 | -0.23 | — | — |
| 3300 | — | — | — | — | — | — | -0.18 | -0.14 |
| 3825 | — | — | — | — | — | — | -0.22 | -0.17 |
| 4375 | — | — | — | — | — | — | -0.25 | -0.22 |
| 4500 | — | — | — | -0.26 | +0.03 | -0.34 | — | — |
| 4925 | — | — | — | — | — | — | -0.24 | -0.26 |
| 5475 | — | — | — | — | — | — | -0.27 | -0.25 |
| 6000 | -2.28 | -0.39 | -0.45 | -0.41 | +0.04 | -0.31 | — | — |
| Inter-calibration drift Dev/Spec (Δ) — change since previous calibration, normalized | ||||||||
| 200 | — | — | — | — | -0.10 | -0.36 | — | — |
| 350 | — | — | — | — | — | — | — | -0.23 |
| 550 | — | — | — | — | — | — | — | -0.18 |
| 1000 | — | — | — | — | +0.11 | -0.32 | — | — |
| 1100 | — | — | — | — | — | — | — | -0.09 |
| 1650 | — | — | — | — | — | — | — | -0.01 |
| 2000 | — | — | — | — | +0.13 | -0.33 | — | — |
| 2200 | — | — | — | — | — | — | — | +0.06 |
| 2750 | — | — | — | — | — | — | — | +0.08 |
| 3000 | — | — | — | — | +0.10 | -0.31 | — | — |
| 3300 | — | — | — | — | — | — | — | +0.04 |
| 3825 | — | — | — | — | — | — | — | +0.05 |
| 4375 | — | — | — | — | — | — | — | +0.03 |
| 4500 | — | — | — | — | +0.09 | -0.27 | — | — |
| 4925 | — | — | — | — | — | — | — | -0.01 |
| 5475 | — | — | — | — | — | — | — | +0.02 |
| 6000 | — | -0.31 | -0.37 | -0.35 | +0.07 | -0.24 | — | — |
Figure 1 shows each calibration's as-found deviation normalized to the internal specification. Values at ±1.0 reach the specification limit. The shaded blue envelope covers the full spread across all setpoints; the amber band adds measurement uncertainty (RSS). For the full methodology, see Equipment Monitoring & Drift Analysis.
Figure 2 shows the drift between consecutive calibrations — how much the device changed since it was last calibrated or adjusted. This isolates the device’s instability from corrections applied during calibration.
Pressure Upstream (mbar)
| Setpoint (mbar) | 2010 | 2011 | 2012 | 2013 | 2014 | 2015 | 2016 | 2018 |
|---|---|---|---|---|---|---|---|---|
| Adjusted | Yes | Yes | Yes | Yes | Yes | Yes | — | Yes |
| As-found Dev/Spec — measured error normalized to internal specification | ||||||||
| 200 | — | — | — | -0.44 | +0.03 | -0.27 | — | — |
| 350 | — | — | — | — | — | — | -0.70 | -0.36 |
| 550 | — | — | — | — | — | — | -0.52 | -0.28 |
| 1000 | — | — | — | -0.21 | +0.37 | -0.01 | — | — |
| 1100 | — | — | — | — | — | — | -0.26 | -0.13 |
| 1650 | — | — | — | — | — | — | -0.17 | -0.07 |
| 2000 | — | — | — | -0.11 | +0.59 | +0.07 | — | — |
| 2200 | — | — | — | — | — | — | -0.22 | -0.07 |
| 2750 | — | — | — | — | — | — | -0.26 | -0.10 |
| 3000 | — | — | — | -0.13 | +0.55 | -0.02 | — | — |
| 3300 | — | — | — | — | — | — | -0.28 | -0.14 |
| 3825 | — | — | — | — | — | — | -0.32 | -0.17 |
| 4375 | — | — | — | — | — | — | -0.35 | -0.22 |
| 4500 | — | — | — | -0.22 | +0.45 | -0.15 | — | — |
| 4925 | — | — | — | — | — | — | -0.35 | -0.26 |
| 5475 | — | — | — | — | — | — | -0.37 | -0.26 |
| 6000 | -2.10 | -0.30 | -0.50 | -0.15 | +0.48 | -0.16 | — | — |
| Inter-calibration drift Dev/Spec (Δ) — change since previous calibration, normalized | ||||||||
| 200 | — | — | — | — | +0.20 | -0.09 | — | — |
| 350 | — | — | — | — | — | — | — | +0.34 |
| 550 | — | — | — | — | — | — | — | +0.24 |
| 1000 | — | — | — | — | +0.32 | -0.07 | — | — |
| 1100 | — | — | — | — | — | — | — | +0.12 |
| 1650 | — | — | — | — | — | — | — | +0.10 |
| 2000 | — | — | — | — | +0.45 | -0.09 | — | — |
| 2200 | — | — | — | — | — | — | — | +0.15 |
| 2750 | — | — | — | — | — | — | — | +0.16 |
| 3000 | — | — | — | — | +0.47 | -0.10 | — | — |
| 3300 | — | — | — | — | — | — | — | +0.14 |
| 3825 | — | — | — | — | — | — | — | +0.15 |
| 4375 | — | — | — | — | — | — | — | +0.13 |
| 4500 | — | — | — | — | +0.51 | -0.10 | — | — |
| 4925 | — | — | — | — | — | — | — | +0.09 |
| 5475 | — | — | — | — | — | — | — | +0.11 |
| 6000 | — | -0.25 | -0.45 | -0.09 | +0.53 | -0.10 | — | — |
Figure 3 shows each calibration's as-found deviation normalized to the internal specification. Values at ±1.0 reach the specification limit. The shaded blue envelope covers the full spread across all setpoints; the amber band adds measurement uncertainty (RSS). For the full methodology, see Equipment Monitoring & Drift Analysis.
Figure 4 shows the drift between consecutive calibrations — how much the device changed since it was last calibrated or adjusted. This isolates the device’s instability from corrections applied during calibration.
Resistance (Ω)
| Setpoint (Ω) | 2010 | 2011 | 2012 | 2013 | 2014 | 2015 | 2016 | 2018 |
|---|---|---|---|---|---|---|---|---|
| Adjusted | Yes | Yes | Yes | Yes | Yes | Yes | — | Yes |
| As-found Dev/Spec — measured error normalized to internal specification | ||||||||
| 100 | — | — | — | +0.00 | +0.00 | +0.00 | +0.08 | -17.04 |
| 110 | — | — | — | +0.00 | +0.00 | +0.00 | +0.24 | — |
| 115 | — | — | — | — | — | — | — | — |
| Inter-calibration drift Dev/Spec (Δ) — change since previous calibration, normalized | ||||||||
| 100 | — | — | — | — | +0.00 | +0.00 | +0.08 | -17.12 |
| 110 | — | — | — | — | +0.00 | +0.00 | +0.24 | — |
| 115 | — | — | — | — | — | — | — | — |
Figure 5 shows each calibration's as-found deviation normalized to the internal specification. Values at ±1.0 reach the specification limit. The shaded blue envelope covers the full spread across all setpoints; the amber band adds measurement uncertainty (RSS). For the full methodology, see Equipment Monitoring & Drift Analysis.
Figure 6 shows the drift between consecutive calibrations — how much the device changed since it was last calibrated or adjusted. This isolates the device’s instability from corrections applied during calibration.
