Table of Contents
Instruction Manual
Form 1013
December 2005
b. For reverse-acting controllers, set it between
3.5 and 4.0.
4. The OUTPUT gauge should read 0 bar (0 psig)
for direct or full supply pressure for reverse action.
5. Increase the process variable until the OUTPUT
gauge changes to full supply pressure for direct or 0
bar (0 psig) for reverse action. The process variable
should be at the desired high trip value.
6. Decrease the process variable until the OUTPUT
gauge changes to 0 bar (0 psig) for direct or full
supply pressure for reverse action. The process
variable should be at the desired low trip value.
7. If all prestartup checks are satisfactory, proceed
to the Startup section. If performance is
unsatisfactory, proceed to the Calibration section.
Adjustments
This section explains controller/transmitter action
and adjustments. Figure 10 shows adjustment
locations.
Control Action
The following is a definition of control action.
D Direct Action—Increasing fluid level, interface
level, or density, increases the output signal.
D Reverse Action—Increasing fluid level,
interface level, or density, decreases the output
signal. Controller/transmitters factory-set for
reverse-acting have the suffix letter R added to their
type number.
The control action is determined by the cage head
mounting position and by the Bourdon tube-flapper
arrangement in the controller/transmitter. Refer to
figure 4 for mounting positions and to figure 15 for
Bourdon tube-flapper arrangements. To change the
action, refer to the changing action procedure in the
Maintenance section.
Level Adjustment (Controllers Only)
To make a level adjustment, open the controller
cover, loosen the knurled adjustment screw, and
rotate the adjustment lever around the RAISE
LEVEL dial. To raise the fluid or interface level, or
increase density, rotate this knob in the direction of
the arrows. To lower the level or decrease density,
rotate the knob in the opposite direction. This
procedure is the same for either direct or reverse
action. Tighten the knurled screw.
The RAISE LEVEL dial does not reflect
actual fluid level in the tank or fluid
level position on the displacer.
Zero Adjustment (Transmitters Only)
To make a zero adjustment, open the transmitter
cover, loosen the adjustment screw and rotate the
adjustment lever around the ZERO ADJUSTMENT
dial. This adjustment sets the output pressure to
correspond to a specific level on the displacer.
Tighten the knurled screw.
Proportional Band Adjustment (Except
Transmitters and 2503 Series
Controllers)
The proportional band adjustment varies the amount
of process variable change required to obtain a full
output pressure change. To perform this adjustment,
open the controller cover and turn the
PROPORTIONAL BAND adjustment (see figure 10).
Refer to the prestartup check procedures to
determine the proper setting.
Specific Gravity Adjustment
(Transmitters Only)
This adjustment also varies the amount of process
variable change required to obtain a full output
pressure change. To perform this adjustment, open
the transmitter cover and turn the SPECIFIC
GRAVITY adjustment (see figure 10). Refer to the
prestartup check procedures to determine the proper
setting.
Calibration
Precalibration Requirements
The controller/transmitter can be calibrated in the
field, mounted on the vessel containing the process
fluid. It may also be done in the shop, but other
means of obtaining a displacement force change
must be provided. There are wet and dry methods of
adapting the calibrating procedure.
Type 2500
Note
15
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