Span Adjustment; Preliminary Checks - Emerson Fisher L2 Instruction Manual

L2 Controller
July 2015

Span Adjustment

Except where indicated, key numbers referenced in the following procedures are shown in figure 8. The span levers
and other proportional band information are shown in figure 5.
Figure 5. Proportional Band Adjustments
SPAN LEVER GAP
MINIMUM SPAN (MOST SENSITIVE) POSITION
FOR THROTTLING AND ON/OFF CONTROLLER.
MAXIMUM SPAN (LEAST SENSITIVE) POSITION
FOR SNAP‐ACTING CONTROLLER
GB0137-2
E0787

Preliminary Checks

1. Check the supply pressure gauge (key 10) to be certain that the supply pressure is at the desired value. Adjust the
supply pressure as required.
2. Adjust the displacer rod to the horizontal position with the spring adjustment (key 4).
3. Bounce the end of the displacer rod (key 64, figure 7) up and down to check that the sensor is operating freely.
4. Place the span adjuster (key 9) at the desired position (see figure 5).
8
LEVER A
LEVER B
MAXIMUM SPAN (LEAST SENSITIVE) POSITION FOR
THROTTLING AND ON/OFF CONTROLLER. MINIMUM SPAN
(MOST SENSITIVE) POSITION FOR SNAP‐ACTING
CONTROLLER
LEVER A CONTACTING
THE DISPLACER ROD
Instruction Manual
D103032X012