Emerson Fisher L2e Configuration guide

www.Fisher.com
Replacing the Controller Assembly
(RL2E0X00C12) on the FisherrL2e Electric Level
Controller
Supplement to Fisher L2e Electric Level Controller Instruction
Manual (D103531X012)
This supplement contains information on how to replace the complete controller assembly on the L2e controller.
Refer to the L2e instruction manual (D103531X012), available from your Emerson Process Management sales office or
at www.Fisher.com, for all other information regarding the L2e electric level controller.
WARNING
Always wear protective clothing, gloves, and eyewear when performing any maintenance operations to avoid personal
injury. To avoid personal injury or property damage caused by the release of pressure or process fluid, observe the
following before starting maintenance:
D Provide some temporary means of control for the process before taking the controller out of service.
D Provide a means of containing the process fluid before removing any measurement devices from the process.
D Vent any trapped process pressure.
D Check with your process or safety engineer for any additional measures that must be taken to protect against process
media.
WARNING
For explosionproof applications, disconnect power before installing, servicing or removing electrical components.
Personal injury or property damage from fire or explosion may result if power is not disconnected.
Select junction boxes, wiring and/or cable glands that are rated for the environment of use (such as hazardous location,
ingress protection, and temperature). Failure to use properly rated electrical hardware wiring and/or cable glands can
result in personal injury or property damage from fire or explosion. Wiring connections must be in accordance with local,
regional, and national codes for any given hazardous area approval. Failure to follow the local, regional, and national codes
could result in personal injury or property damage from fire or explosion.
Instruction Manual Supplement
D104022X012
L2e Controller
September 2015

Instruction Manual Supplement
D104022X012
L2e Controller
September 2015
2
Removing the Controller From the Sensor
Refer to figure 1 for key number locations unless otherwise indicated.
1. Disconnect power from any electrical source.
2. Disconnect electrical wiring from switch.
3. Note Span adjustment setting.
4. Slide the hook end of the zero spring (key 7) over and off the controller end of the displacer rod (key 64).
5. Remove the four controller mounting screws (key 24), and pull the controller straight away from the sensor.
Figure 1. Fisher L2e Controller
SWITCH
SPAN
ADJUSTMENT
LEVER B
GG10047
w/Displacer Rod
PLUNGER
FACTORY SET - DO NOT ADJUST
LEVER A
CONTROLLER MOUNTING
SCREWS (KEY 24)
ZERO SPRING
(KEY 7)
ZERO ADJUSTMENT
DISPLACER
ROD (KEY 64)
ZERO ADJUSTMENT
HEX NUT (KEY 5)

Instruction Manual Supplement
D104022X012
L2e Controller
September 2015
3
Replacing the Complete Controller Assembly (RL2E0X00C12)
Refer to figure 1 for key number locations unless otherwise indicated.
1. Install the new controller assembly on the sensor. (Make sure lever A is under the displacer rod.)
2. Mount with the four 7/16” cap screws (key 24), supplied in the kit. Torque to 6.8 N•m (60 lbf•in), using medium
strength thread locking adhesive.
3. Slide the hook end of the zero spring (key 7) onto the controller end of the displacer rod (key 64).
4. Reconnect switch wiring.
5. Reconnect power to electrical source
6. Perform the Initial Setup (Dry Displacer) and Zero and Span Adjustment procedures below.
L2e Initial Setup (Dry Displacer)
Refer to figure 2.
1. Move Span to minimum setting.
2. Move Zero down until the valve opens, or N/C contact (red to brown leads) closes.
3. Slowly move Zero up until valve closes, or N/C contact (red to brown leads) opens.
Figure 2. Initial Setup
GG11109-C

Instruction Manual Supplement
D104022X012
L2e Controller
September 2015
4
L2e Zero and Span Adjustment (Wet Displacer)
After initial setup (dry displacer) is complete,
1. Enable process flow into the vessel.
2. Move Zero and Span Adjustment for desired liquid zero position (setting noted on previous unit) and level DG
(differential gap).
3. Tighten the Zero Adjustment hex nut (key 5), shown in figure 1, to lock the Zero setting.
Emerson Process Management
Marshalltown, Iowa 50158 USA
Sorocaba, 18087 Brazil
Chatham, Kent ME4 4QZ UK
Dubai, United Arab Emirates
Singapore 128461 Singapore
www.Fisher.com
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