In the operation of industrial cold storage, Temperature and pressure gauges and dataloggers (self-recording thermometers) It is a mandatory "eyes and ears" measuring device for controlling the storage conditions of food, seafood, and medical pharmaceuticals according to standards. HACCP, ISO 22000 and GSP (Good Storage Practices). A small deviation in temperature monitoring can lead to the entire shipment being damaged or failing export inspection. Tan Long We provide and integrate a complete range of mechanical measuring instruments, digital controllers, and 24/7 remote IoT monitoring solutions that meet quality and measurement standards.
🏢 Tan Long's Automated Surveillance Solutions
Tan Long is an integrator of automated control and measurement systems for large-scale projects:
- ASRS NECS cold storage SCADA system (102,642 pallets): Manages over 500 real-time temperature, pressure, and humidity readings with an accuracy of ±0.1°C.
- Pharmaceutical warehouse meeting GSP standards: Temperature mapping monitoring, automatic SMS alerts, and an audible alarm when temperature fluctuations occur.
- Siemens/Schneider PLC control cabinets: Includes a digital clock and Modbus RS485 communication port.
1. Classification of Cold Storage Temperature Gauges and Devices
| Type of Measuring Device | Principles & Measurement Ranges | Outstanding Brand | Practical Applications |
|---|---|---|---|
| Mechanical thermometer (Metal pin / Capillary wire) | Bourdon tube or bimetallic strip, measuring range -50°C to +50°C, no power supply required. | Wika (Germany), Wise (Korea), Yamaki | Mount it outside the warehouse door or on the compressor housing for on-site visual observation. |
| Electronic digital controller & display | NTC/PT100 sensor, sharp LED display, compressor and defrost relay switching. | Dixell (Emerson – Italy), Carel (Italy), Elitech, Conotec | Installed on the main control panel of all industrial cold storage facilities. |
| Datalogger thermometer (GSP/HACCP standard) | Stores 16,000–32,000 measurement points, connects via USB port to export PDF/Excel reports. | Testo (Germany), Elitech RC-5+, LogTag (New Zealand) | Mandatory for warehouses storing medicines, vaccines, refrigerated vehicles, and seafood for export. |
| Remote wireless IoT monitoring system | Zigbee/LoRaWAN wireless sensors connect to the cloud, providing 24/7 alerts via SMS/App. | Tan Long SCADA, Siemens, Advantech | Large logistics center, multi-branch food distribution warehouse chain. |
2. Standards for Calibration and Verification of Cold Storage Meters According to State Regulations
- Periodic inspection requirements (Circular of the Ministry of Science and Technology): Temperature measuring devices used in food and pharmaceutical storage are required to have calibration certificates from reputable metrology centers (Quatest 1, Quatest 3, or the Metrology Institute's Testing Center).
- Accuracy allowed:
- Cold storage for food and seafood: Standard deviation should not exceed ±1.0°C.
- Pharmaceutical and vaccine cold storage (GSP): Strict standard deviation not exceeding ±0.5°C.
- Temperature Mapping Evaluation: Position the sensors at the most unfavorable points (near doorways, sheltered corners, highest points on shelves) to ensure there are no overheated areas.
3. Refrigerant Pressure Gauges (High & Low Pressure) for Operating Technicians
In addition to the warehouse air temperature gauge, industrial air conditioning systems are required to install pairs of... Oil pressure gauge, measuring suction pressure (low pressure) and discharge pressure (high pressure).:
- It helps engineers accurately monitor the condensation pressure and evaporation pressure of refrigerants (R22, R404A, R507A, NH3).
- Timely detection of gas shortages, clogged expansion valves, condenser buildup, or compressor overload is crucial for addressing issues before compressor fires or explosions occur.
Is your business in need of a survey, upgrade, or new design for your industrial refrigeration system?
With over 18 years of practical experience leading more than 29 major national projects, Tan Long's team of HVAC engineers is committed to providing accurate thermal load calculations, optimizing the COP efficiency coefficient, switching between natural refrigerants NH3/CO2, and saving 20–30% in operating electricity costs.
Engineer Nguyen Toan Thinh (Technical Director)
With over 18 years of practical experience in directing, consulting, designing, and constructing heavy industrial refrigeration systems, ASRS automated warehouses, and IQF freezing systems across more than 29 major national projects.
