Emerson Fisher L2 Instruction Manual page 2

L2 Controller
July 2015
Table 1. Specifications
Available Configurations
Controller: Snap‐acting or throttling
Sensor: Displacer‐type liquid level sensor for
mounting to side of tank. Displacer travel is
transmitted to controller by pivotal movement of
displacer rod
Input Signal
Type: Liquid level or liquid‐to‐liquid interface
Level Change Required for Full Change in Output
Signal in 1.0 Specific Gravity Liquid, with 1.4 Bar (20
Psig) Supply Pressure, Direct Action, and Standard 48
x 305 mm (1‐7/8 X 12‐Inch) Vertical Displacer with
Standard Lever Arm Length:
Minimum Proportional
Control
Band Level Change, mm
Mode
(Inches
Throttling 102 (4)
On/Off 127 (5)
Snap‐acting 13 (0.5)
Minimum Specific Gravity
Throttling and On/Off Controllers: Minimum specific
gravity, or specific gravity differential for interface
applications, is 0.1 (see footnote 3)
Snap‐Acting Controllers: Minimum specific gravity, or
specific gravity differential for interface applications,
is 0.1
Output Signal
Pneumatic J on‐off or J proportional pressure
signal
Ranges:
Throttling: J 0.2 to 1.0 bar (3 to 15 psig) or J 0.4 to
2.0 bar (6 to 30 psig)
On/Off: 0 (off) or full supply pressure (on)
Action: Field‐reversible between direct (increasing
level increases output signal) and reverse (increasing
level decreases output signal)
Supply Pressure Requirements
Throttling and On/Off Controller
Throttling: 1.4 bar for 0.2 to 1.0 bar output signal (20
psig for 3 to 15 psig output signal) and 2.4 bar for 0.4
to 2.0 bar output signal (35 psig for 6 to 30 psig
output signal)
On/Off: Any desired pressure between 1.4 and 3.4 bar
(20 and 50 psig).
Snap‐Acting Controller: Any desired pressure
2
Maximum Proportional
Band Level Change, mm
)(1) (1)
(Inches)
305 (12)
305 (12)
20 (0.8)
(2)
between 1.4 and 5.2 bar (20 and 50 psig) direct, and
1.4 bar and 2.4 bar (20 and 35 psig) reverse
Do not use supply pressure below 1.4 bar (20 psig)
Supply Medium
Air or natural gas
Steady‐State Air Consumption
Throttling Controller: ≤0.03 normal m
at 1.4 bar (20 psig) supply pressure
Snap‐Acting Controller: ≤0.03 normal m
scfh) at 1.4 bar (20 psig) supply pressure or ≤0.04
3
normal m /hr (1.5 scfh) at 2.4 bar (35 psig) supply
pressure in tripped condition; air consumption
increases during trip
Sensor to Vessel Connection
J 2 NPT threaded or J NPS 2 CL150 through 1500
slip‐on flange connection
Controller Connections
Supply: 1/4 NPT internal located on the bottom of the
case
Output: 1/4 NPT internal located on the top of the
case
Case Vent: 1/4 NPT internal with vent screen
assembly located on the back of the case
Standard Displacer Size
48 x 305 mm, 541 cm
Maximum Displacer Insertion Length
Standard lever arm length plus one 6‐inch extension,
horizontal or vertical
Displacer Material and Maximum Sensor Working
(8)
Pressure
PVC Displacer: Consistent with CL1500 pressure
temperature ratings per ASME B16.34 up to
maximum pressure of 258 bar (3750 psig)
For PED (97/23/EC) maximum pressure limited to 200
bar (2900 psig)
S31603 SST Displacer: CL600 pressure temperature
ratings per ASME B16.34 up to maximum pressure of
99.3 bar (1440 psig)
Note: For slip‐on flange connection, maximum sensor
working pressure must be consistent with the flange
ratings
-Continued-
Instruction Manual
(4)
(5)
3
/hr (1.0 scfh)
3
(6)
3
(1‐7/8 x 12 inches, 33 in
(7)
D103032X012
/hr (1.0
3)