Emerson Level-Trol 2500 Series Instruction Manual page 3

Instruction Manual
Form 1013
December 2005
Available Configurations
Type 2500—Proportional-Only controller
Type 2500C—Proportional-Only controller with
indicator (see figure 10)
Type 2500R—Reverse acting proportional-only
controller
Type 2500S—Differential gap (snap acting)
controller. See changing controller action
procedure and figure 15
Type 2500T—Transmitter
Type 2503—Differential gap controller without
proportional valve; for applications requiring very
little adjustment
(2)
Input Signal
Fluid Level or Fluid-to-Fluid Interface Level:
From 0 to 100% of displacer length—standard
lengths for all sensors are 356 mm or 812 mm
(14 inches or 32 inches). Other lengths available
depending on sensor construction.
Fluid Density: From 0 to 100% of displacement
force change obtained with given displacer
volume. Standard volume for displacers are listed
in table 2.
(2)
Output Signal
Type 2500 Controller and 2500T Transmitter:
0.2 to 1 bar (3 to 15 psig) or 0.4 to 2 bar (6 to 30
psig)
Type 2500S and 2503 Differential Gap
Controllers: 0 bar (0 psig) when switched off and
full supply [1.4 or 2.4 bar (20 or 35 psig) nominal
depending on controller output pressure range]
when switched on.
Area Ratio of Relay Diaphragms
3:1
Supply Pressure Data
(3)
See table 3
Supply Medium
(7)
Air or natural gas
Maximum Supply Pressure
3 bar (45 psig) to the controller or transmitter. If
controller or transmitter is equipped with an
Table 1. Specifications
(1)
(3,6)
integrally mounted Type 67FR filter/regulator,
typical supply pressure to the regulator is from 2.5
bar (35 psig) to 17 bar (250 psig), maximum. For
supply pressures to the filter/regulator, refer to the
appropriate regulator instruction manual.
Steady-State Air Consumption
2500 Series Controllers and Transmitters
(2500, 2500C, 2500R, 2500S, and 2500T): See
table 3
Type 2503 Controller: Vents only when relay is
exhausting
Proportional Band
(Proportional-Only Controllers)
Full output pressure change adjustable over 10 to
100% of displacer length
Differential Gap
Controllers)
Type 2500S Controller: Full output pressure
change adjustable from 20 to 100% of displacer
(5)
length.
Type 2503 Controller: Full output pressure
change adjustable over approximately 25 to 40%
of displacer length
(2)
Span Adjustment (Type 2500T Transmitter)
Full output pressure change adjustable from 20 to
100% of displacer length
(2)
Set Point (controllers only) or Zero
(transmitters only) Adjustment
For proportional-only controllers or transmitters,
level adjustment positions the set point or zero for
the fluid level, interface level, or displacer force
change (density) within the displacer length.
For differential gap controllers, level adjustment
simultaneously positions both ends of the gap
within the displacer length.
Performance
Independent Linearity
1% of output pressure change for 100% span.
Hysteresis: 0.6% of output pressure change at
100% proportional band, differential gap, or span
(continued)
Type 2500
(2)
Adjustment
(5)
(2)
Adjustment (Differential Gap
(5)
(5)
(2)
(2)
(transmitters only):
3