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CPR Force Sensing Resistor (FSR) Test Report
In cardiopulmonary resuscitation (CPR), chest compressions must reach 5–6 cm in depth at 100–120 compressions per minute — with adult compression forces typically between 40 and 60 kg, peaking near 80 kg. The sensor that measures this is not a comfort feature; it is a component in a life-critical feedback loop. Between 15 and 27 August 2026, the VMANX laboratory completed an 11-item reliability testing protocol on the VF-3119-030 flexible FSR force sensor. Every item passed. In parallel, the customer completed a 10-million-cycle compression life test on the integrated device — also passed.
CPR compression feedback: the flexible FSR sensor measures compression force and rhythm in real time
Q1. What does this sensor actually do in a CPR device?
VF-3119-030 est resistor sensoris flexibilis ad vim in pellicula tenui (FSR). Resistentia eius decrescit monotone dum vis applicata crescit, itaque resistentia mensurata directe converti potest in vim compressionis. Inter manus salvatoris et pectus patientis positus — aut in manichino ad exercitationem RCP aut in cuspide ad retroactionem incorporatus — indicat instrumento, et ideo salvatori, utrum quaelibet compressio sufficiens sit, et utrum ritmus servetur.
In hac applicatione sensor non premens interruptorem metitur. Qualitatem conatus resuscitationis metitur, saepe milies per instrumentum, interdum in ambulanti, in aula exercitationis, aut in scena emergentiae extra aedificium.
Quaeritur 2. Cur fiducia magis importat hic quam in typica applicatione sensoris?
Quia modi defectus sunt silentes. Sensor qui post decem dies continuos oneris derivat, aut cuius basis post frigidam noctem in ambulanti commutatur, non se indicat — simpliciter vim falsam refert. Pro instrumento ad auxilium CPR, hoc significat rescissorem posse moneri compressionem esse sufficientem, cum tamen non sit.
Ideo protocollum VMANX non sistit ad quaestionem "an operetur?". Interrogat: an etiam post viginti cycli scissurae thermicae inter +85 °C et −40 °C identice operetur? Post ducentos quadraginta horas conservationis ad temperaturas altas et bassas? Post decem dies sub onere constante 5 kgf? An unitas #1 eadem est ac unitas #10?
Q3. Quod protocollum experimentale adhibitum est?
Undecim articuli, executi a die 15 usque ad 27 Augusti 2026 in laboratorio VMANX, referentes ad methodos ambientales IEC 60068-2 et ISO 16750. Haec est delineatio qualitatis et fidibilitatis quam ad componentes sensus vis vitalium applicamus:
| # | Test Item | Condicio / Methodus | Resultatum | Iūdicium |
| 1 | Vis excitans | 10 pecuniae, inspectio plena | 4–9 gf (media 5.9 gf) | Permitte |
| 2 | Mensuratio dolor | 50–3 000 gf, 10 pecuniae | 6.47 KΩ @50gf → 1.01 KΩ @3,000gf | Permitte |
| 3 | Constituentia a Loto ad Lotum | 10 PCS, identical force points | CV ≤ 12.9% (≤ 6% at high force) | Permitte |
| 4 | No-load impedance | 10 PCS, before / after climate test | 9.8–11.3 KΩ → 9.9–11.0 KΩ | Permitte |
| 5 | Hysteresis error | 3 PCS, loading / unloading 50–2,000 gf | ≤ 2% at 2,000 gf | Permitte |
| 6 | Continuous load endurance | 2.5 kgf × 24 h | 1.0–1.1 KΩ, drift < 5% | Permitte |
| 7 | Long-term drift | 5 kgf × 10 dies, 30 lectiones | 153.2–160.9 Ω (±2.5%) | Permitte |
| 8 | Scelerisque inpulsa | +85 °C ↔ −40 °C, 20 cycli | Curva profili immutata, functio normalis | Permitte |
| 9 | Alta / bassa temperatura depositum | −40 °C et +85 °C, 120 h utraque (240 h totalis) | Aspectus et praestatio conformis | Permitte |
| 10 | Verificatio fortitudinis maximalis | onus applicatum 80 kg | 89,7 Ω, nullum defectum | Permitte |
| 11 | Calibratio sensibilitatis | Correlatio inter resistentiam et fortitudinem | 100 Ω ↔ 27,95 kg | Permitte |
Constitutio experimenti: dynamometrum digitale SUNDOO cum multimetro Precision MT-1280 in stativo calibrato
Q4. Quae ex his resultatis maxime momenti sunt ad ingenium dispositivi CPR?
Tria eorum.
▪ Intervalum amplectitur usum realem. Fortitudines compressionis CPR ascendunt ad circiter 80 kg in extremo. Ad 80 kg sensor ostendit 89,7 Ω et redit ad normam — nulla saturatio, nullum damnum. Totus curvus a 50 gf sursum est lenis et monotonicus, quod calibrationem fidelem facit.
▪ Non derivat sub onere constante. Decem dies ad constantem 5 kgf produxerunt totalem dispersionem 153,2–160,9 Ω, circa ±2,5 % — melius quam referentia designata ±4 %. Apparatus calibratus die primo adhuc accuratus est die decimo.
▪ Supervivit ambienti. Post 20 cyclorum thermicarum inter +85 °C et −40 °C, curva resistentiae versus fortiam eandem retinuit formam et sensor adhuc plene functus est; post 240 horas conservationis ad −40 °C et +85 °C, et aspectus et performantia erant conformes.
Fig. 1 Caracteristica campi mensurandi — 10 PCS, angustus fascis dispersionis, lenis responsio monotona
Fig. 2 Derivatio longi temporis — onus constans 5 kgf per 10 dies, variatio totalis ±2,5 %
Fig. 3 Shock thermalis, ante et post 20 cyclorum (+85 °C ↔ −40 °C) — forma curvae servata
Q5. Quomodo probata est durabilitas longi temporis?
Ab customero, super dispositivo finito. Customerus testum vitam compressionis decem millionum cyclorum super producto integrato perfecit et id transivisse confirmavit.
Ad numerum illum in contextum ponendum: ad 100–120 compressiones per minutum, resuscitatio completa decem-minutaria est circiter 1 000–1 200 compressiones. Decem milliones cyclorum ergo aequivalent plus quam 8 000 eventibus resuscitationis completis — multo ultra vitam operationalem instrumenti, in quo integratur. Data laboratorii ostendunt quomodo sensor agit; hic autem testus ostendit quam diu eodem modo agat.
| Confirmatio durabilitatis | Ambitus | Resultatum |
| testus vitam compressionis decem millionum cyclorum | Ab parte customeri, dispositivo integrato | Superavit |
Exemplaria 1–5 intra cameram temperaturae/umiditatis HQ-TPH150 pro 240 horis in deposito ad temperaturas altas et bassas
Q6. Quid hoc ad customerum significat qui VMANX aestimat?
It means the data exists before you ask for it. Every figure quoted above comes from a dated laboratory record — trigger force, range, consistency, impedance, hysteresis, endurance, drift, thermal shock, climate storage, peak load and calibration — and can be supplied as raw test sheets on request.
For medical and life-critical applications, VMANX applies this protocol as standard practice rather than as a one-off exercise. Sensors are characterised across units, not just as a single golden sample; they are stressed environmentally before release; and where the customer runs an independent life test, we align our data with theirs.
VF-3119-030 flexible FSR force sensor — samples from the tested batch
Ad Primum Aspectum
▪ 11 reliability test items — 100% pass rate (15–27 Aug 2026)
▪ Trigger force 4–9 gf | range verified to 80 kg (89.7 Ω, no failure)
▪ Long-term drift ±2.5% over 10 days at 5 kgf constant load
▪ Functionalis post 20 cyclorum thermicorum (85 °C ↔ −40 °C) et 240 h conservationis climaticae
▪ Testis vitae compressionis 10 000 000 cyclorum verificatus a cliente — superatus
