Instruction Manual

Instruction Manual
D103531X012
L2e Controller
June 2014
2
Description
The L2e electric liquid level differential gap on-off controller uses a displacement type sensor to detect liquid level or
the interface of 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.
These controllers use a single pole double throw (SPDT) dry contact electric switch to provide differential gap (DG)
control or liquid monitoring. The controller can be used to provide an electric control signal to an electrically actuated
control valve.
Unless otherwise noted, all NACE references are to NACE MR01752002.
Specifications
Specifications for the controller and sensor are listed in table 1.
Educational Services
For information on available courses for L2e electric liquid level controllers, as well as a variety of other products,
contact:
Emerson Process Management
Educational Services - Registration
Phone: [phone] or [phone]
[e-mail]
http://www.emersonprocess.com/education