Data Sheet

2500-249 Controllers and Transmitters
D200037X012
Product Bulletin
34.2:2500
July 2012
5
Table 4. Supply Pressure Data
OUTPUT SIGNAL
STANDARD SUPPLY AND OUTPUT
PRESSURE GAUGE INDICATIONS
(1)
NORMAL OPERATING
SUPPLY PRESSURE
(2)
AIR CONSUMPTION AT NORMAL
OPERATING SUPPLY PRESSURE
(3)
Normal m
3
/h
(6)
Scfh
(6)
Bar Psig Min
(4)
Max
(5)
Min
(4)
Max
(5)
0.2 to 1.0 bar (3 to 15 psig),
except 0 and 1.4 bar (0 and 20
psig)
(2)
for on‐off controllers
0 to 30 psig 1.4 20 0.11 0.72 4.2 27
0.4 to 2.0 bar (6 to 30 psig),
except 0 and 2.4 bar (0 and 35
psig)
(2)
for on‐off controllers
0 to 60 psig 2.4 35 0.19 1.1 7 42
1. Consult your Emerson Process Management sales office about gauges in other units.
2. Control and stability may be impaired if this pressure is exceeded (except 2503 or 2503R controller without proportional valve).
3. Except 2503 or 2503R controller, which bleeds only when relay is open at exhaust position.
4. At zero or maximum proportional band or span setting.
5. At setting in middle of proportional band or span range.
6. Normal m
3
/hr=normal cubic meters per hour at 0_C and 1.01325 bar. Scfh=standard cubic foot per hour at 60_F and 14.7 psia.
Features
n Easy Adjustment—Set point, proportional valve
opening, and reset changes are made with simple
dial‐knob controls.
n Simple, Durable Construction—Few moving parts
are used. Knife‐edged driver bearing in sensor and
plated brass instrument case ball bearing for torque
tube rotary shaft help provide low‐friction
operation. Sensors are available in ratings up to
CL2500.
n Mounting Versatility—Caged sensors are available in
a variety of orientations and connection styles, and
all sensors can be either right‐ or left‐hand
mounted.
n Sensitive to Small Changes—Displacer reaction to
small specific gravity changes allows these
instruments to be used for density applications and
in other applications where a response to low levels
of input signal change is required.
n Easy Reversibility—Action is field reversible from
direct to reverse or vice versa without additional
parts.
n Reduced Maintenance Costs—Spring‐out wire
provides for in‐service cleaning of relay orifice
(figure 1). Torque tube can be replaced without
removing torque tube arm.
n Reduced Operating Costs—Supply pressure
conservation is enhanced in all constructions
because relay exhaust opens only when output
pressure is being reduced.
n Smaller Vessel Sizes Required for Stable
Control—Caged 249 sensors come standard with a
liquid damping orifice in the lower equalizing
connection that helps stability where vessel
capacitance is small and permits narrower
proportional valve settings.