Madison Company offers several level indication products designed specifically for standard 20-, 30- and 55-gallon drums. These level indicators will fit-up directly with standard 3/4” NPT bungs.
This family of standard level indicators comes in low-level, high-level and multi-level designs, for both low- and high-level indication. The basic level switches require a power source. When configured with an alarm, battery power is on-board.
Optional alarms are available in either a fixed-mount (to the level switch) or a remote-mount design. This option provides both the level switch and the alarm with battery power for ease of use in remote sites where a power source is not readily available.
For those drum applications requiring a non-contact level device, the Madison U3M Mini Ultrasonic Sensor is the way to go. This sensor also mounts directly into a 3/4” NPT bung and requires a power source. The sensor is calibrated by the user using an on-board push button. The U3M is available in two configurations: one that is designed for infrequent removal and the other with a connector lead-wire termination for quick disconnect and removal from the drum head. These sensors are configured with RS485 communications for PC networks.