# Cold Chain Monitoring System

> ColdTag sensors and door contacts reporting to a wall-mounted gateway, so hundreds of coldrooms show up on one dashboard with a local alarm at each site.

- **Page** - https://iotready.com/hardware/coldchain-monitoring
- **Family** - [Cold Chain](https://iotready.com/hardware/family/coldchain)
- **Form factor** - System
- **Datasheet** - https://iotready.com/downloads/coldchain-system-datasheet.pdf

## At a glance

- **100 m*** Range, free space
- **25,000** Readings buffered per tag
- **100s** Sites, one dashboard
- **Local + cloud** Alarm - siren and dashboard

Pairs ColdTag sensor tags and door contacts with a wall-mounted Gateway that
bridges every reading to a centralized dashboard and a mobile app. Sensors
stream over Bluetooth LE to the nearest Gateway - up to 100 m in free space,
and reliably through a standard coldroom door, including metal. The Gateway
drives a local siren or strobe the instant a threshold or a door event trips,
while raising the same alert on the dashboard.

The dashboard watches hundreds of sites from one screen, with live temperature
status, alert history and gateway and door health side by side. The mobile app
handles on-site commissioning: mapping each tag and door sensor to its site, and
diagnosing signal and gateway status during a visit.

## Specifications

| Parameter | Value |
| --- | --- |
| Sensors | ColdTag BLE temperature tags and battery-powered door contacts |
| BLE range | Up to 100 m free-space; reliable through a standard coldroom door, incl. metal |
| Gateway uplink | Wi-Fi and wired Ethernet; GSM/cellular optional |
| Local alarm | Dry relay output (siren/strobe) and onboard buzzer on the Gateway |
| Gateway power | 12 V or 24 V DC, wall-mount enclosure |
| Dashboard | Live per-site temperature status, alert history, gateway/door health |
| Mobile app | On-site commissioning - maps tags and door sensors to a site |
| Offline behaviour | Each ColdTag buffers 25,000 readings locally; drains to the Gateway on reconnect |

## Used by

- [Cold chain monitoring for Flipkart Minutes](https://iotready.com/case-studies/flipkart-cold-chain.md): Wireless sensors in every freezer, chiller and tropical zone across sourcing hubs and dark stores, with local alarms that keep working when the internet does not.