Model: GS5A is a device used to monitor and alert temperature fluctuations in cold storage facilities when temperature exceeds preset thresholds or in case of power outages.
I. Functions
Programmed for web-based temperature monitoring, connected to one temperature sensor placed inside the storage facility.
Transmits temperature data to the server via Wi-Fi. Sends SMS notifications to predefined phone numbers when the actual temperature exceeds preset limits (either lower or higher than permissible). The device sends SMS alerts to 1 to 5 configured phone numbers and simultaneously triggers a relay to activate the alarm siren.
Upon loss of main power supply (grid power), the embedded SIM module will send SMS alerts to up to 5 preconfigured phone numbers.
Equipped with 2 expansion relays. These can be used to connect to additional sensors such as smoke detectors, fire alarms, door open/close sensors, etc. (When these expansion relays are in use, SMS alerts will be sent to up to 5 phone numbers with customizable messages, e.g., “Cold storage door open,” “Cold storage door closed,” “Smoke detected,” “Fire detected,” etc.)
On-site audible alarm (a built-in buzzer will sound locally within the device).
Temperature displayed via 7-segment LED displays.
Temperature data is transmitted to the server every 3 minutes.
II. Technical Specifications
Temperature range: -35ᴼC to 70ᴼC
Temperature sensor cable length: 2 meters (extendable)
One on/off relay connected to an external siren (2 terminals)
Two input signals (Alarm 01, Alarm 02) for extended alerts (2 terminals)
Temperature displayed using four 7-segment LED digits (e.g., -12.5 or 50.7)
4G SIM module, SMS-enabled
The device is equipped with 2 external antennas mounted on the enclosure (1 for Wi-Fi signal, 1 for mobile/SMS signal)
Power supply via external adapter: 5 VDC - 2A
Internal lithium battery: 3.7V 1000 mAh (provides 5–6 hours of operation during power outages)
Includes one power connector and connectors for sensor input, relay output, and power cut-off.
For further information, please contact:
Services Technology Number One Viet Nam Company Limited
Office Address: 509 Thuy Phuong Street, Thuy Phuong Ward, Bac Tu Liem District, Hanoi City, Vietnam.
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