What is it?

The SG6100 is a pneumatic indicating controller designed to measure and regulate process variables such as pressure and temperature. It uses mechanical sensing elements (like Bourdon tubes, bellows, or temperature bulbs) and produces a standard pneumatic output signal for control (3–15 psi / 0.2–1 bar). It also displays the measured value locally on an analog scale.

Where is it used?

It is used in industrial process environments where pneumatic control loops are still common, such as chemical plants, refineries, steam systems, and older process installations that rely on air-powered instrumentation. It is suited for controlling temperature, liquid, gas, or steam pressure, and for any application where electrical instrumentation is not preferred or allowed.

How does it work?

The instrument senses a physical variable through a mechanical element: for pressure using Bourdon tubes or bellows, and for temperature using a liquid-filled thermal bulb system. As the process variable changes, the mechanical movement is converted into a pneumatic control signal. This signal is modulated between 3–15 psi to drive valves or other pneumatic actuators. At the same time, the front scale provides a clear local indication of the measured value.

What problems does it solve?

The SG6100 provides accurate process control in environments where electrical instruments are unsuitable (e.g., hazardous areas, high temperatures, or locations without power). Its purely pneumatic operation ensures high reliability, immunity to electrical noise, and long service life. It also solves the need for both measurement and control in a single device, reducing complexity and making maintenance easier in traditional pneumatic process systems.