Instruction Manual
D103531X012
L2e Controller
June 2022
2
Description
The L2e electric liquid level differential gap on-off controller uses a displacement type sensor to detect liquid level or
the interface between two liquids of different specific gravities.
The L2e controls the lower trip point (zero) that closes the dump valve, allowing the vessel to fill to the upper trip
point. Once the upper trip point is reached, the dump valve opens to drain the fluid down to the zero or lower trip
point. The difference between the upper trip point and the zero or lower trip point is called differential gap or DG. The
L2e operates as a two position (on-off) controller.
The instrument uses an electronic switch (solid state relay) that provides one Normally Closed (NC) and one Normally
Open (NO) contact. The electronic switch can be used to provide liquid monitoring or to provide differential gap (DG)
control by operating an electrically-actuated valve.
Unless otherwise noted, all NACE references are to NACE MR01752002.
Specifications
Specifications for the controller and sensor are listed in table 1.
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