Safety insurance for millions of USD of goods: A power outage, compressor failure or staff forgetting to close the warehouse door at night can destroy an entire batch of vaccines, pharmaceuticals or hundreds of tons of exported seafood in just a few hours. Tan Long IoT smart temperature monitoring system acts as a Chief Engineer on duty 24/7, immediately detecting temperature abnormalities even as small as 0.5°C and proactively calling management to warn.
3. Standards for Hot/Cold Spot Evaluation Using Thermodynamic Method (Temperature Mapping)
To achieve GSP good drug storage practice certification from the Ministry of Health or FDA seafood export standards, a temperature monitoring system needs to go through the Temperature Mapping 24-72 hour appraisal process:
- Arrange a minimum of 9 - 15 sensor points: Place at the upper corners, lower corners, center of the warehouse, near the import and export door and right in front of the evaporator fan's flow.
- Determine the hottest spot (Hot Spot) & coldest spot (Cold Spot): Official monitoring sensors will be fixed at these highest risk locations to ensure that when the risk point meets the standard, 100% of the remaining space is absolutely safe.
- Power failure & warehouse door opening test (Door Open Test): Measure the time it takes for the temperature to increase from the safe threshold to the red alert level to create an emergency rescue plan for the business.
4. Comparison Table of Traditional Wire Sensors and LoRaWAN / Zigbee Wireless Sensors
| Technical Criteria | Wired Sensor PT100 / Modbus RS485 | Industrial LoRaWAN Wireless Sensor |
|---|---|---|
| Signal stability | Absolutely 100%, not affected by thick metal panel walls | It is very good if the Gateway receiving station is arranged properly in the cold storage |
| Cost and installation work | Special conduit must be inserted, drilling through the panel is laborious | Attach with magnets or super-fast screws in 5 minutes, without punching the wall |
| Power source active | Use 24VDC power from the central electrical cabinet | Dedicated battery that can withstand -40°C cold for continuous use for 3 - 5 years |
| Ability to expand the number of measurement points | Limited by number of PLC analog input ports | Easily add hundreds of sensors on the same management Gateway |
| Most suitable application | Large industrial cold storage, refrigeration compressor station, pressure tank | Refrigerated trucks, modular cold rooms, wireless mobile pallet data points |
5. Audit Trail Feature to Prevent Data Fraud
Immutable SHA-256 Encryption
All temperature records, door opening times, compressor running times and alarm history are recorded with a real-time Timestamp cryptographic hash. No individual, including administrators, can retroactively edit metrics.
Automated Inspection Appraisal Report
Automatically synthesize MKT (Mean Kinetic Temperature) index, Max/Min value, standard deviation and export PDF files with electronic digital signatures ready to serve Drug Administration inspection teams and HACCP assessment teams.
1. Multi-layer IoT SCADA Temperature Monitoring System Architecture
- Highly sensitive industrial sensor: PT100 thermal detector or IP68 waterproof SHT35 digital sensor, measuring range from -70°C to +100°C with extremely low error of only ±0.1°C, with Quatest 3 measurement inspection stamp.
- Gateway central controller with 4G/WiFi connection: Collect data wirelessly LoRa or wired RS485 Modbus to prevent interference from probes, integrated UPS backup battery to power itself for 12 hours when mains power is lost.
- Cloud Dashboard cloud monitoring platform: Intuitive Web/App interface, showing real-time thermometer temperature floor plan, automatically drawing temperature variation graphs and exporting Excel/PDF files for storage to serve HACCP, ISO and FDA inspection teams.
- Multi-channel emergency warning mechanism: When the temperature exceeds the set safety threshold or there is a power outage, the system activates the on-site siren, and automatically makes direct phone calls (Voice Call) and sends SMS to 5 emergency phone numbers.
2. Integrated Energy Management
Not only stopping at passive monitoring function, Tan Long's SCADA system connects directly to the compressor inverter and evaporator fan:
- Automatically increase cold storage capacity at night when electricity prices are low (off-peak hours).
- Automatically reduce compressor load during peak electricity prices while still maintaining safe cargo temperatures. Solution Details can be found at optimizing industrial cold storage energy.
In-Depth Technical FAQs on IoT SCADA Temperature Monitoring
1. Does the system work and send warnings when there is a power outage in the entire factory?
Completely normal. The central controller has a built-in backup Lithium battery that provides power for at least 12 hours. When there is a power outage, the system immediately activates messages and calls reporting 'Main power failure' to let the manager know to run the backup generator.
