What this solves
Cold chain operations break at the connectivity seam.
Your warehouse has Ethernet. Your reefer trucks need cellular. Your remote vaccine sites only have LoRa or NB-IoT. Most gateway products force you to deploy three different vendors. The G20 handles every radio in one device, so the same gateway hardware ships across your entire footprint.
6 + 1
wireless options (5G, 4G, NB-IoT, WiFi, LoRa, 485) plus Ethernet standard. One SKU across every site condition.
2 in 1
standalone collector with built-in temperature + humidity sensing AND gateway aggregator for downstream sensor mesh. Same device, both jobs.
Wall + Vehicle
mount options — same gateway runs in cold storage and refrigerated trucks. Optional GPS for fleet visibility.
Why operations teams choose G20
One gateway architecture across your full footprint.
Six radios in one device
Ethernet standard. Optional 5G, 4G, NB-IoT, WiFi, LoRa, and 485. Choose the radio per site instead of stocking multiple gateway SKUs.
Standalone + aggregator
Built-in temperature and humidity sensing means G20 works as a complete monitoring node on day one — and also aggregates downstream S20K, S6K, and external probe mesh.
Wall mount or vehicle bracket
Same hardware deploys on a cold-storage wall, mounted to a refrigerated truck, or attached to a portable insulated container. Optional GPS adds real-time location to every reading.
Audit-ready records
Same zTMS cloud platform as S20K and S6K. Real-time visibility, tamper-resistant exports, and compatibility with electronic records standards for regulated industries.
Why ZKSCool
Why ZKSCool G20 — one gateway across cold storage, transport, and remote sites.
| SINGLE-RADIO GATEWAY | MULTI-VENDOR STACK | ZKS-G20 | |
| Wireless options | ~ One radio only (WiFi OR cellular) | ~ Multiple boxes, multiple SKUs | ✓ Ethernet standard + optional 5G · 4G · NB-IoT · WiFi · LoRa · 485 — one SKU |
| Standalone collector mode | — Gateway only · separate sensor required | — Separate sensor procurement | ✓ Built-in temperature + humidity sensing — one device, both jobs |
| Mount options | ~ Fixed install only | ~ Varies per vendor | ✓ Wall plate + vehicle bracket — same SKU |
| Location data | — Not available on gateway | ~ Separate GPS tracker product | ✓ Optional integrated GPS — every site, every reading |
| Downstream sensor aggregation | ~ Limited mesh size | ~ Cross-vendor integration overhead | ✓ Aggregates ZKSCool S20, S20K, S6K, S6SA and external probes natively |
| Operations platform | ~ Vendor-specific dashboard | — Three separate dashboards | ✓ One zTMS dashboard for entire cold-chain stack |
| Validation service | ~ Vendor-locked cloud · premium kits | — Coordination overhead across vendors | ✓ One-stop · GSP global · GxP/IQ-OQ-PQ in selected countries |
How it works
From sensor mesh to zTMS Cloud — your choice of radio.
1
Choose the radio.
Ethernet ships standard. Specify 5G, 4G, NB-IoT, WiFi, LoRa, or 485 per site. The same G20 hardware accepts the module that matches your environment.
2
Mount it.
Wall-plate the gateway in a cold storage facility, or fit it to the vehicle bracket for refrigerated truck deployment. Optional GPS adds live location to every reading.
3
Pair the mesh.
G20 acts standalone with built-in temperature and humidity sensing, or aggregates downstream S20K, S6K, and external probes across the site. Quick WiFi config from the device menu.
4
Stream to zTMS.
All readings flow into one zTMS Cloud dashboard — real-time visibility, threshold alerts, audit-ready exports. Same platform as every other ZKSCool device on your network.
Specifications
| Model | G20 |
|---|---|
| Mode | Standalone collector + gateway aggregator (switchable) |
| Display | 5-inch TFT colour LCD |
| Controls | Power · menu · up · down (4 buttons) |
| Menu functions | System info · alarm history · quick WiFi config · restart · power off |
| Alarms | Local sound + light · cloud push (over-temp, power loss, low battery) |
| Internal probe | Optional built-in temperature + humidity sensing |
| External probe support | Optional external temperature + humidity probe |
| Sensor mesh support | Aggregates downstream ZKSCool collectors (S20K, S6K, external probes) |
| Accuracy | ±0.5°C (0°C to +65°C) · ±1°C (−40°C to 0°C) · Humidity ±5% |
| Ethernet | Standard (built-in) |
| Cellular | Optional 5G · 4G · NB-IoT |
| WiFi | Optional (with quick WiFi config menu) |
| LoRa | Optional (long-range, low-power — for remote sites) |
| RS-485 | Optional (legacy equipment integration) |
| Location | Optional GPS |
| Cloud platform | zTMS · REST API · webhooks |
| Offline buffer | Local memory holds readings through signal loss; auto-uploads on reconnect |
| Battery | Rechargeable Li-ion (built-in) |
| Battery capacity | 6,000 mAh polymer lithium |
| Operating life | ~1 day on internal battery (mains-powered for fixed deployments) |
| Charging | Power input + USB |
| Low-battery alarm | Red LED blinks every 5s + cloud push when capacity drops below 20% |
| IP rating | IP54 (catalog-confirmed) |
| Mounting | Wall mount (with base plate) · vehicle bracket (in-truck deployment) |
| Dimensions | [NEED DATA — engineering to confirm L×W×H] |
| Weight | [NEED DATA — engineering to confirm grams] |
| Operating environment | −10°C to +55°C (normal battery) |
Where the G20 is deployed
From multi-zone warehouses to refrigerated trucks.
Cold storage facility
Multi-zone warehouse aggregation
Refrigerated transport
In-vehicle gateway with GPS
Vehicle bracket mount + 4G or 5G + optional GPS = real-time temperature, route, and ETA visibility for every reefer in your fleet. Same hardware as your warehouse deployment.
Remote vaccine site
LoRa or NB-IoT for low-signal sites
Validation support
Same one-stop validation service across every G20 deployment.
ZKSCool has offered a one-stop validation service . Whether your G20 sits in a pharma warehouse, a refrigerated truck, or a remote vaccine clinic, the qualification package (GSP globally available; GxP / IQ/OQ/PQ in selected countries) is scoped to your environment — so your QA team starts qualified.
✓ GSP — globally available · GxP / IQ-OQ-PQ — selected countries only (confirm with team)
✓ Calibration certificate (traceable)
✓ Standard Operating Procedure templates
✓ Pre-deployment qualification support
✓ System integration support (ERP / WMS / QMS)
Pairs with
The full cold-chain stack — one accountable team.
Frequently asked
Questions buyers screen for.
Standalone mode is for single-fridge or single-cabinet sites where G20 itself does the temperature and humidity sensing. Gateway mode is for multi-sensor sites where G20 aggregates dozens of downstream S20K, S6K, or external probe units into one zTMS uplink. The hardware is the same — choose at deployment based on the site.
Ethernet for facility installations with wired network. WiFi for sites with reliable corporate WiFi. 4G or 5G for refrigerated trucks and locations without LAN. NB-IoT or LoRa for low-power, long-range remote sites where cellular signal is weak. RS-485 for integration with legacy equipment. Each radio is a module — you pick what fits the site.
Yes. G20 ships with both a wall mounting plate and a vehicle bracket option. The same gateway hardware deploys in cold storage and refrigerated transport. Optional GPS adds live location to every reading from the moving asset.
The G20 RS-485 module supports integration with legacy and third-party equipment via standard protocols. For deeper compatibility with specific sensor brands, contact our engineering team — custom integration work is part of our integrated delivery model.
The G20 logs every reading to local memory throughout any signal outage. When connectivity returns, the queued data auto-uploads to zTMS. No reading is lost.
Yes. All G20 traffic enters the same zTMS Cloud platform that supports tamper-resistant exports and is compatible with electronic records standards for regulated industries. Our one-stop validation service offers GSP qualification globally and GxP / IQ/OQ/PQ qualification in selected countries — scoped to your deployment environment.
Ready to evaluate the G20?
Reply within 1 business day · Sample units available · Validation package on request