The short message system (SMS) of a standard mobile phone can be used for remote site monitoring and controlling various equipments. This feature of a standard mobile phone can be implemented for a variety of industrial applications. The main attractive feature of this system is that, the user can monitor and control his desired equipments from any part of the world. The user may get the status of a remote device like pressure, temperature, voltage, current, On/Off condition, weight etc by sending respective SMS to the remote device.

The Global Positioning System (GPS) is a satellite-based navigation system. GPS was originally intended for military applications, but in the 1980s, the government made the system available for civilian use. A Global positioning system (GPS) receiver calculates its position by precisely timing the signals sent by the GPS satellites high above the Earth. Now, with distance measurements from a few more satellites, the receiver can determine the user's position and sends this information to the user, using a GSM module through SMS. The GPS/SMS based tracking system, which uses the GPS, GSM and SMS technologies to enable users to keep track of their vehicles.

There are many way to measure continuous level of liquid. But most of them are very expensive. We have developed a very low cost high accuracy capacitive sensor which produces a frequency output signal, that is directly proportional to the height of the liquid. You may get the volume of the liquid directly if the tank is calibrated.