... apparatus (thermometer, humidity meter, electric meter, flow meter) to user or monitoring center by ... Valve controls;12. Wellheads;13. Energy saving, street lights control;14. Tanks, temperatures, water leakage; ... Sensor, Oil Overflow Level Sensor, Water Leak Sensor, Temperature Sensor, Door Sensor, PIR Motion Sensor, Smoke Sensor, Gas Leak Sensor, Glass Break Sensor, Shock Sensor, Power failure sensor ...