What this solves
When the cabinet itself needs to keep the story straight.
The S6SA records every reading from −200°C cryogenic to +150°C, uploads in real time over 4G, and exports tamper-resistant PDFs on demand. Built-in door magnetic, light, and vibration sensors capture chain-of-custody events alongside the temperature record. The audit gets the full picture, not just the curve.
Door + Light + Vibration
three built-in event sensors alongside temp + humidity. Full chain-of-custody on high-value cabinet loads — every event timestamped.
−200 / +150°C
PT100 cryogenic probe option. CGT cryogenic transport, ULT freezers, GMP cabinets, ambient pharma — one device covers every zone.
App + SMS + Voice
multi-channel alarm routing beyond local sound + light. Cloud push to mobile app, SMS to QA, voice call to on-call escalation.
Why operations teams choose S6SA
Built for cell therapy. Works for everything else.
−200°C to +150°C — single device
PT100 cryogenic probe covers ULT freezers, cryogenic transport, and cell therapy. NTC covers 2°C–8°C. One SKU, every zone.
Audit-grade records
Tamper-resistant PDF and CSV exports, timestamped, ±0.5°C (0°C to +65°C). Built for regulated electronic-record standards.
4G real-time + LBS location
LTE-FDD, LTE-TDD, GSM. LBS gives city-level location on every reading. 60,000 local readings buffer through outages.
Door, light, vibration sensors
Built-in detection for cabinet door events, light exposure, and handling shocks. Every event timestamped — chain-of-custody for high-value loads.
Why ZKSCool
Why ZKSCool S6SA — the audit-grade flagship.
| OTHER SUPPLIERS | ZKS-S6K | ZKS-S6SA | |
| PT100 cryogenic (−200°C to +150°C) | ~ Separate cryogenic SKU · premium tier | ✓ Same SKU — pluggable probe option | ✓ Same SKU — pluggable probe option |
| Built-in event sensors | — Temperature only · door/light/vibration external add-on if at all | ~ Customizable: oxygen, vibration, light | ✓ Built-in door magnetic + light + vibration — standard |
| On-device records | — Cloud-only · portal trip required | ✓ On-device PDF · USB export · Bluetooth printer pairing | ~ Cloud-based · multi-channel push |
| Multi-channel alarm routing | ~ Email + SMS via vendor dashboard | ✓ On-device PDF · USB export · Bluetooth printer pairing | ✓ Sound + light · cloud · App · SMS · voice |
| Transport / aviation testing | ~ Regional shipping certs vary | ✓ IP66 test certified · multi-mode shipping reports | ✓ DO-160 aviation tested · drop tested |
| Validation service | ~ Vendor-locked cloud · premium kits | ✓ One-stop · GSP global · GxP/IQ-OQ-PQ in selected countries | ✓ One-stop · GSP global · GxP/IQ-OQ-PQ in selected countries |
How it works
From sensor to audit report — in four steps.
1
Place & activate
Mount in your refrigerator, freezer, or shipment. Long-press to power on, no setup tools required.
2
Continuous logging
Configurable sampling and upload intervals. Internal probe + external PT100/NTC/humidity options.
3
Real-time upload
4G streams to zTMS Cloud with LBS location. Local buffer holds data through signal outages.
4
Alert & report
Local sound + light alarm fires instantly. PDF report exports via USB or Bluetooth printer on demand.
Specifications
| Model | ZKS-S6SA |
|---|---|
| Display | 1.3-inch OLED |
| On-device controls | Sound + light indicators (no on-device menu) |
| On-device menu functions | App-driven · alarm log via cloud |
| On-device PDF + USB export | — |
| Bluetooth printer pairing | — |
| On-device alarm log | Cloud-based alarm history |
| Storage capacity | 60,000 readings |
| Internal sensor | Built-in temperature + humidity |
| External probe options | NTC · Temp + humidity · PT100 |
| External probe channels | External probe port |
| Additional built-in event sensors | Door magnetic · light sensor · vibration detection |
| NTC operating range | −40°C to +80°C |
| PT100 cryogenic operating range | −200°C to +150°C |
| Temperature accuracy | ±0.5°C (0 to +65°C) · ±1°C (−40 to 0°C) |
| Humidity accuracy | ±5% |
| Local alarm | Sound + light · over-temp, power loss, low battery |
| Cellular | 4G — LTE-FDD, LTE-TDD, GSM |
| WiFi | — |
| Bluetooth | BLE 4.0 |
| Location | LBS · uploaded with each reading |
| SIM | — |
| Cloud platform | zTMS · REST API · webhooks |
| Cloud alarms | Cloud push + App + SMS + voice call |
| Offline buffer | 60,000 readings local · auto-upload on reconnect |
| Battery | Polymer lithium 6,000 mAh (standard) · 5,000 mAh (low-temp variant) |
| Operating duration | 30 days continuous use |
| Standby current | ≤100 µA |
| Charging | USB · DC 5V / 1A |
| Low-battery behavior | Red LED blinks every 5s when <20% · cloud platform low-battery push |
| IP rating | IP66 — AIoT catalog spec; test certificate pending engineering |
| Mounting | Embedded in cabinet |
| Storage temperature | −40°C to +65°C |
| Working temperature | Normal battery: −10°C to +55°C · Low-temp battery: −40°C to +55°C |
| CE marking (EU) | ✓ Certified (2025-08-20) |
| FCC certification (US) | ✓ Certified (2025-08-19) |
| RoHS (EU) | ✓ Certified (2025-04-02) |
| China 3C / CCC | — Not in current registry |
| Explosion-proof certification | — |
| GSP compliance | ✓ Meets national pharmaceutical GSP requirements |
| 21 CFR Part 11 / EU Annex 11 design alignment | ✓ Designed around electronic-records principles |
| ISO 17025 traceable calibration | Available via our validation service |
| IQ / OQ / PQ validation | One-stop service — available in selected countries · scoped per customer environment · confirm coverage with our team |
Where the S6SA is deployed
Built for the cold chain that crosses temperature classes.
Cell & gene therapy
Cryogenic CGT transport
PT100 probe handles −80°C to −196°C cryogenic shipment monitoring. LBS location on every reading. Per-patient chain-of-custody export ready for QA audit.
Audit-grade pharma
GMP-aligned manufacturing + distribution
2°C–8°C standard pharma cold chain with multi-sensor capability (humidity, door, light, vibration). zTMS Cloud exports into your existing QMS — Veeva, MasterControl, TrackWise via REST API.
Hospital + clinical lab
ULT freezer + blood bank monitoring
−80°C ULT freezer monitoring for samples, biologics, and blood components. PT100 cabinet probe + door/light/vibration alerts. Local sound + light alarm for staff response, cloud push for facility leadership.
Validation service
GSP confirmed. GxP, IQ, OQ, PQ — scoped to your environment.
ZKSCool operates a one-stop validation service. Standard scope is GSP. International scope (GxP, IQ/OQ/PQ aligned with EU GMP Annex 15 and US FDA expectations) is built per customer environment by our validation team in partnership with your QA leads. Talk to us about your jurisdiction, regulatory framework, and validation timeline.
✓ GSP — confirmed since 2022
✓ GxP scoped to customer environment
✓ IQ / OQ / PQ documentation packages
✓ Calibration certificate (traceable)
✓ Recalibration program
Frequently asked
Questions buyers screen for.
Yes. The device logs locally to internal memory throughout any signal outage and auto-uploads queued data the moment connectivity returns. No reading is lost in transit.
Yes. The S6SA generates tamper-resistant PDF and CSV exports with timestamped records suitable for audit defense, and is compatible with electronic records standards used in regulated industries. Our one-stop validation service scopes the appropriate qualification package — GSP, GxP, or IQ/OQ/PQ — to match your environment. Talk to our team about which protocols apply to your deployment.
Built-in NTC and temp+humidity sensors. External support for PT100, NTC, and temp+humidity probes. Customisable options for oxygen, vibration, and light sensing on request.
IP66 — protected against powerful water jets, dust ingress, mechanical shock, and drops. Suitable for refrigerated trucks, outdoor loading docks, and field deployment.
Yes. zTMS exposes a REST API and webhook events for integration with SAP, Oracle, and major QMS platforms. Custom connector development is available through our engineering team.
Different category. Service-led 3PLs manage your shipment end-to-end and own the data. ZKSCool gives you the device, the platform, and the records — you keep ownership of your cold chain data and you stay free to choose any logistics partner. Many of our customers use both: a 3PL for execution, S6SA for independent monitoring and audit defense.
Yes. S6SA is logistics-agnostic. Deploy it inside any shipment, refrigerator, or vehicle — Marken, Quick, CSafe, Cryoport, Biocair, World Courier, your own fleet, or a regional carrier. zTMS dashboards and exports work the same regardless of carrier.
With the external PT100 probe, the S6SA measures from −200°C to +150°C — covering liquid nitrogen vapor (~−196°C), ULT (−80°C), deep frozen (−20°C), refrigerated (2°C–8°C), controlled room temperature, and high-temperature thermal validation. The probe goes where the sample goes; the logger body remains in its operating range.
zTMS is designed around the principles of electronic records and electronic signatures — timestamped readings, audit-trail logging, user access controls, and tamper-resistant exports. Final Part 11 / Annex 11 qualification depends on your validation scope (intended use, SOPs, training). Our team scopes IQ/OQ/PQ to match your environment as part of the validation service.
The S20 is a logistics-grade tracker — built for in-transit shipments with GPS, 4G, and a 60,000-reading capacity. The S6SA is built for fixed and mobile monitoring of high-value or wide-temperature-range environments: cryogenic to high-temp coverage via PT100, OLED display, door/light/vibration sensors, and integrated platform reporting. Many customers run both — S20 on shipments, S6SA on freezers and CGT-grade loads.
Direct technical support from our San Francisco team (North America) and partner network across Europe. Headquarters and engineering in Shenzhen serve our Asia-Pacific customers directly.
Ready to evaluate the S6SA for your CGT or audit-grade cold chain?
Reply within 1 business day · Sample units available · Validation scope on request