ABH-200-E
External-probe fridge monitor
Probe through the seal
Fridge monitor with a cabled SHT45 T+RH probe on 1.5 m PUR cable — the door stays sealed, the sensor sits where the product sits.
Design visualization · 88.2 × 69.9 × 23.8 mm
ABH-200-E — every number a QA team asks for
Channel-level accuracy, memory depth in readings, enclosure geometry and the firmware trust chain — the full picture before you ask for the pilot.
| Product type | Online · Wi-Fi monitor |
| Sensing channels | 4 (Probe T + RH · Ambient T + RH) |
| Probe T + RH | PRB-SHT45 · ±0.1 °C typ · ±1.0 %RH · head −40…+85 °C · 1.5 m PUR |
| Ambient T + RH | SHT41 on-board (monitor body) |
| Measurement accuracy | Sensor ±0.2 °C typ · ±0.4 °C max (0–65 °C) on-board SHT41 · system class 1 as-shipped on live USB (class 0.5 on battery / with USB power save) |
| Display & indication | 1.54″ e-paper 200 × 200 · −25…+50 °C · holds last reading while asleep |
| Connectivity | Wi-Fi 2.4 GHz (ESP32-C3-MINI-1U) · MQTT over TLS 1.2+ — Internal FPC · ≤2.33 dBi |
| Power | USB 5 V · CR2032 RTC ≈10 yr |
| Battery life | Always on when powered · RTC cell ≈10 yr — Exp-F port card carries the probe |
| Memory | 16 MB W25Q128JV · 409,600 readings · separate never-erased audit region |
| Sample interval | 1 s minimum · configurable |
| Enclosure | 88.2 × 69.9 × 23.8 mm · Healthcare-grade disinfectant-resistant PC/ABS · UL94 V-0 · white |
| Ingress protection | IP54 in use / IP65 capped (design targets) · probe IP65 at head |
| Mounting | Keyhole (2×) + bonded 10×2 mm magnets |
| Operating band | −25 to +50 °C (monitor) · probe head −40…+85 °C |
| Firmware | Signed .abhfw packages · dual-bank A/B · RSA-2048 · trial boot with automatic rollback · MQTT over TLS 1.2+ with per-device credentials · X.509 client certificates / mTLS on the roadmap |
| Factory identity | ABH-[model]-[YYWW]-[5-digit sequence] — factory identity written to the ID EEPROM |
| Ports | USB-C power · JST-GH probe port (Exp-F) |
The ABH line is at the design-frozen, pre-production stage: every enclosure has passed generated fit-check geometry (791/791 checks, 20/20 SKUs) and every battery-life, drop, thermal and IP figure shown is a calculated or simulated design estimate — measured values replace them as validation hardware runs. Regulatory marks above are the certification roadmap, not held certificates.
- No door-seal breach debate: cable gland route, sealed monitor outside
- SHT45 factory serial number is the probe's calibration identity
- Probe and ambient channels in one record — see the door-cycle signature
- Vaccine & pharma fridges (2–8 °C)Always-on USB monitor with e-paper, alarm LED and PT100 probe — the WHO-PQS-style vaccine-fridge use case.
- PRB-SHT45-1M5 — Cabled T+RH probePRB-SHT45-1M5 · PRB-SHT45-2M0
- ABH-200 — Online fridge monitor
- ABH-200-E datasheetPDFFull specification, applications and probe options
- ABH range overviewAll 20 SKUs and the platform story
- Platform capability briefSoftware, compliance and architecture
Datasheets describe the current design release (ABH-PLATFORM 0.0.4). Battery-life and IP figures inside are calculated design estimates; measured values follow validation hardware.
One PCB, one firmware, one compliant record
One 80 × 50 mm 4-layer platform PCB — 146 parts, single-sided SMT — becomes 20 SKUs by BOM selection and a SKU record in the on-board ID EEPROM.
Signed .abhfw packages · dual-bank A/B · RSA-2048 · trial boot with automatic rollback
MQTT over TLS 1.2+ with per-device credentials · X.509 client certificates / mTLS on the roadmap
Plug an offline logger into a PC and it enumerates a FAT16 drive with README.TXT, DATA.CSV and an ECDSA P-256-signed REPORT.PDF — a self-verifying trip record.
Probe channel templates live in the ID EEPROM; the platform tracks NIST-traceable calibration certificates, due dates and reminders per probe.
Certification roadmap: EN 12830:2018 — temperature recorders · CE — RED / EMC / safety · FCC Part 15 · WHO PQS E006 — vaccine cold chain · IEC 61010-1 / IEC 62368-1 · UN 38.3 / IEC 62133-2 — cells & packs — targets, not held certificates.
Put the ABH-200-E to work
Book a demo and we'll scope a pilot around your sites — quantities, probes, alert rules and the reports your QA team will hand the inspector.