Model G31 alarm system supports the quad band GSM at 850, 900, 1800, and 1900MHz, and is designed specifically for use in the transformers worldwide. If for any reason one phase of the 3-phase, 4-wire transformer encounters problems, the alarm would sound. Below is a list of several desirable features found in this transformer theft alarm system:
1. When a thief tries to open or strikes the GSM alarm, the tamper proof alarm or shockproof alarm would be tripped.
2. Users can set a time at which the alarm system would automatically send self-diagnosis data to transformer supervisors for convenient equipment management on a daily basis.
3. Up to 6 alarm messages and 2 mobile phone numbers can be put into the wireless alarm module. In the event of theft, the alarm module would send pre-set messages or make phone calls to those 2 mobiles
4. 4 wireless zones & 4 wired zones
5. Users can edit the name of each detection zone for easier identification.
6. Up to 10 seconds of speech can be recorded into the alarm module. When the alarm sounds, it would first play that speech to repel any timid thieves.
7. The alarm receiving center enables alarm users to centralize alarm management. In addition to displaying the time, location, and type of the emergency, the alarm receiving center can also control the alarm system via various software.
8. Intelligent temperature monitoring system automatically activates the heater when the ambient temperature drops below -20℃. The heater remains functional at a temperature as low as -30℃.

Technical Specifications
GSM frequency: 850/900/1800/1900MHZ (with quad-band suitable for worldwide use)
Wireless signal frequency: 315MHz/433MHz Wireless distance：100-200m(for open-air applications)
Response time: ≤8s (when the GSM communication system functions normally)
Power Supply
Voltage：AC 220V 50Hz/60Hz
Standby power: < 0.6W
Back-up battery: DC12V/1200mAH
Battery working life≥10h
Operating Conditions
Temperature: -45~ 60℃ humidity: ≤95% (without condensation)
Recording Time: 10s

Standard Configurations
1×SMS-Activated Power Alarm Module
1×Wireless Digital Keypad
1×Built-in Rechargeable Lead-Acid Battery
1×User Guide