Fisher 2500 Series Instruction Manual page 3

Available Configurations
Type 2500—Proportional-Only controller
Type 2500C—Proportional-Only controller with indi-
cator (see figure 12)
Type 2500R—Reverse acting proportional-only
controller
Type 2500S—Differential gap (snap acting) control-
ler. See changing controller action procedure and
figure 17.
Type 2500T—Transmitter
Type 2503—Differential gap controller without pro-
portional 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 14 inches or 32 inches
(356 mm or 812 mm). Other lengths available de-
pending 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: 3
to 15 psig (0.2 to 1 bar) or 6 to 30 psig (0.4 to 2 bar)
Type 2500S and 2503 Differential Gap Control-
lers: 0 psig (0 bar) when switched off and full sup-
ply [20 or 35 psig (1.4 or 2.4 bar) nominal depend-
ing on controller output pressure range] when
switched on.
Area Ratio of Relay Diaphragms
3:1
Supply Pressure Data
(3)
See table 3
Maximum Supply Pressure
45 psig (3 bar) to the controller or transmitter. If
controller or transmitter is equipped with an integral-
ly mounted Type 67FR filter/regulator, typical sup-
ply pressure to the regulator is from 35 psig (2.5
bar) to 250 psig (17 bar), maximum. For supply
pressures to the filter/regulator, refer to the ap-
propriate 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.
Table 1. Specifications
(1)
(3)
Proportional Band
Only Controllers)
Full output pressure change adjustable over 10 to
100% of displacer length.
(2)
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 displac-
(5)
er 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
ters 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 si-
multaneously positions both ends of the gap within
the displacer length.
Performance
Independent Linearity
of output pressure change for 100% span.
Hysteresis: 0.6% of output pressure change at
100% proportional band, differential gap, or span.
(2)
Repeatability
placement force change.
(2)
Deadband (except differential gap control-
(4)
lers ): 0.05% of proportional band or span.
Typical Frequency Response
gree phase shift at 100% proportional band with
output piped to typical instrument bellows using 20
feet of 1/4-inch tubing.
Ambient Operating Temperature Limits
For ambient temperature ranges and guidelines for
use of the optional heat insulator assembly, see
figure 2. Relay temperature limits are:
Standard Construction: -40 to 160 F (-40 to
71 C)
High-Temperature Construction: 0 to 220 F (-18
to 104 C)
(continued)
Type 2500
(2)
Adjustment (Proportional-
(5)
Adjustment (Differential Gap
(5)
(2)
(2)
(transmitters only): 1%
: 0.2% of displacer length or dis-
(2)
: 4 Hz and 90 de-
(transmit-
3