• Installation Versatility—With the integration of a wafer-style liquid level sensor and transmitter into one product, the L3 enables users to install pneumatic level controllers to a variety of industry standard or custom process vessel connections. Installing the L3 in a customer-supplied external cage gives process equipment designers freedom to select the best process vessel connection location and configuration to meet specific application requirements.
• Easy Adjustment—Set point and proportional valve opening are made with simple dial-knob controls.
• Simple, Durable Construction—Few moving parts are used. Knife-edged driver bearing in sensor and plated brass instrument case ball bearing for torque tube rotary shaft help provide low-friction operation.
• Easy Reversibility—Action is field reversible from direct to reverse or vice versa without additional parts.
• Reduced Maintenance Costs—Spring-out wire provides for in-service cleaning of relay orifice (figure 3).
• Reduced Operating Costs—Supply pressure conservation is enhanced because relay exhaust opens only when output pressure is being reduced.
• NACE Compliant— The materials used in the L3 wafer-style sensor (see table 1) meet the metallurgical requirements of NACE MR0175-2002. Environmental limits may apply.

• Size—NPS 3 or 4 raised-face flange wafer-style sensor suitable for CL150 through 600 flange rating
• Material—Steel or stainless steel
• Application—Level or interface

Notes
Right-hand mounting is standard, and can be field configured to left-hand mounting as required by installation.

During shipment, displacers are detached from the sensors.

Equalizing piping, stillwells, or other equipment may be required for installation. Emerson Process Management does not provide this equipment.

Instruction manuals used with the L3 pneumatic displacer level controller are 2500 and 2503 Series Controllers and Transmitters (part number D200124X012) and 249W Cageless Wafer Style Level Sensor (part number D102803X012).

Note
A cage is not supplied with the L3 .

For a factory built cage-style construction, contact your Emerson Process Management sales office.

Figure 6 provides guidelines for fabricating a cage.
When fabricating a cage or chamber, maintain at least a minimum clearance of 10 mm (3/8-inch) between the diameter of the displacer and the inside diameter of the cage or displacer. Dirty or viscous fluids may require a larger clearance. Provide sufficient cage length below the displacer to ensure that the displacer does not hit the bottom of the cage. When installing the cage, it must be vertically plumb so that the displacer does not strike the side of the cage.
See figure 7 for overall envelope dimensions for mounting an L3.

Available Configurations

Controller: 2500, proportional only
Wafer-Style Sensor: 249W
Matches NPS 3 or 4 raised face flange, suitable for CL150 through 600 flange rating

Displacer length: 356 mm (14-inches)

Input Signal

Level or Interface Level: From 0 to 100 percent of displacer length

Allowable Specific Gravity

Liquid Level: 0.4 to 1.2
Interface Level: NPS 3 wafer: 0.17 differential
NPS 4 wafer: 0.11 differential

Output Signal

0.2 to 1.0 bar (3 to 15 psig) or
0.4 to 2.0 bar (6 to 30 psig)

Output Action

■Direct (increasing fluid or interface level or specific gravity increases output pressure) or
■Reverse (increasing fluid or interface level or specific gravity decreases output pressure)

Supply Pressure(1)

Normal Operation: 0.2 to 1.0 bar (3 to 15 psig): 1.4 bar (20 psig)
0.4 to 2.0 bar (6 to 30 psig): 2.4 bar (35 psig)
Maximum Recommended:
3 bar (45 psig)

Steady-State Air Consumption(2)

0.2 to 1.0 bar (3 to 15 psig):
Minimum(3): 0.11 normal m3/hr (4.2 scfh)
Maximum(4): 0.72 normal m3/hr (27 scfh)
0.4 to 20. bar (6 to 30 psig):
Minimum(3): 0.19 normal m3/hr (7 scfh)
Maximum(4): 1.1 normal m3/hr (42 scfh)

Proportional Band

Proportional band of 0 to 100 percent of displacer length or displacement force change (10 to 100 percent recommended).

Set Point

Continuously adjustable to position control point or differential gap of less than 100 percent anywhere within displacer length (fluid or interface level)

Performance

Hysteresis and Deadband: <1% of output span at 100% proportional band
Repeatability: NPS 3 sensor: 0.3% of displacer length or displacement force change
NPS 4 sensor: 0.2% or displacer length or displacement force change
Typical Frequency Response: 4 Hz and 90-degree phase shift at 100 percent of proportional band, differential gap, or span with output piped to typical instrument bellows using 6.1 meters (20 feet) of 6.4 mm (1/4-inch) tubing
Ambient Temperature Error: ±1.5 percent of output pressure change per 28°C (50°F) of temperature change at 100 percent of proportional band, differential gap, or span when using sensor with standard wall N05500 torque tube

Standard Tubing Connections

1/4 NPT internal

Sensor Working Pressures(1)

CL600 maximum

Standard Supply and Output Pressure Gauge Indications

0.2 to 1.0 bar (3 to 15 psig): 0 to 30 psig
0.4 to 2.0. bar (6 to 30 psig): 0 to 60 psig

Construction Materials

Controller: Die cast aluminum case
Wafer-Style Sensor: See table 1

Mounting Positions

Mounts on top of vessel or on customer supplied cage (see figure 5)

Operating Limits

Allowable Process Temperatures(2) Maximum: 232°C (450°F). See figure 8.
Operative Ambient Temperatures(2)
-40 to 71°C (-40 to 160°F)

Hazardous Area Classification

2500 Series controllers comply with the requirements of ATEX Group II Category 2 Gas and Dust

Note
Neither Emerson, Emerson Process Management, nor any of their affiliated entities assumes responsibility for the selection, use, or maintenance of any product. Responsibility for the selection, use, and maintenance of any product remains with the purchaser and end-user.