Contact Pressure Gauge

The chlorine supply and pressure must be monitored constantly in chlorination. The tanks filled with liquid chlorine are under saturated steam
pressure depending on the prevailing temperature.

A pressure of 5.8 bar prevails at 20 °C, increasing to 10.5 bar at 40 °C. Chlorine tanks in chlorination systems, particularly in industrial applications, could be exposed to impermissibly high temperatures. It is therefore advisable to monitor the cylinder pressure so that the heating can be switched off in time and the temperature reduced.

Contact pressure gauges are frequently used to control electrical chlorine changeover valves. When
the minimum pressure is reached in the cylinder, the contact pressure gauge generates a pulse
actuating the changeover valve.

The pressure gauge is available with a single magnetic spring contact which can be used both
as a minimum-level closing contact (contact makes as the pressure drops) and as a maximum-level
break contact (contact opens as the pressure rises).