The LC40 is a head pressure-operated level controller meant for use on atmospheric storage vessels. The unit can be used as an easy-to-read, real-time visual indicator showing the height of the liquid in a vessel or tank. 

The LC40 senses the head pressure of the liquid in the vessel by means of a diaphragm. The pressure is then translated to height by means of the linkages in the unit. The fluid height is indicated by the position of the pointer on the height scale. As the pointer moves across the scale with rising liquid height, it triggers the switch.

  • The switch option includes a SPDT electric switch that can be set to trigger at different heights for rising and falling level.
  • It has adjustment knobs for zero offset as well as for span which is used to set it for different specific gravity fluids.

FW Murphy is the exclusive BMD distributor for new equipment packages.  

FW Murphy Production Controls offers support for all our products. If you are unable to find the product that you need, please call us at 918-957-1000.


2” NPT
2” grooved
Scale Ranges Available:
0-16’, 0-24’, 0-30’
Max Diaphragm Pressure:
25 psi
Temperature Range:
-20° F to 225°  F (-28°  C to 107°  C) (varies by material selections)
Electric Switch Ratings:
SPDT: 5A @ 125, 250, 480 VAC
1/2A @ 125 VDC, 1/4 @ 250 VDC
Case: Aluminum
Inlet: Ductile iron, 316 SST
Diaphragm: Buna, Viton®
Electrical Connection:
1/2” female NPT

Tank-Level Indicator