Attaching The Sensor To The Vessel; Pressure Connections - Emerson Fisher L2 Instruction Manual

Instruction Manual
D103032X012

Attaching the Sensor to the Vessel

Insert the displacer end of the controller‐sensor assembly into the tank connection, and screw the sensor threads into
the tank connection. Tighten sufficiently to seal the threads. If necessary, loosen or tighten slightly to obtain the
orientation shown in figure 2. Make sure that the controller case is level.
CAUTION
Do not pick up the controller/sensor by lifting the displacer rod (key 64). This action could place excessive stress on the
displacer rod and cause the unit to malfunction.
Figure 2. Sensor Orientation
CORRECT CONTROLLER MOUNTING
HOLE ORIENTATION WHEN MOUNTED ON VESSEL
A6639

Pressure Connections

WARNING
Personal injury or property damage may occur from an uncontrolled process if the supply medium is not clean, dry, oil‐free
air, or non‐corrosive gas. While use and regular maintenance of a filter that removes particles larger than 40 micrometers
in diameter will suffice in most applications, check with an Emerson Process Management field office and industry
instrument air quality standards for use with corrosive air or if you are unsure about the proper amount or method of air
filtration or filter maintenance.
1. Provide a source of clean, dry air that meets the requirements of ISA Standard 7.0.01 as the operating medium.
Refer to table 1 to determine supply pressure.
2. Connect the supply pressure to the 1/4 NPT internal connection on the bottom of the controller case.
3. Connect the output signal line to the equipment being operated and to the 1/4 NPT output connection on the top
of the controller case.
L2 Controller
July 2015
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