Instruction Manual
D200126X012
2502 Controllers
June 2017
3
Table 1. Specifications
Available Configurations
2502:
A direct‐acting controller which provides
proportional‐plus‐reset control
2502C:
A 2502 with a level indicator assembly
2502F:
A 2502 with a differential relief valve
These products are also available with reverse action.
For example, 2502R, 2502CR, and 2502FR
Input Signal
Liquid Level or Liquid‐to‐Liquid Interface Level:
From
0 to 100 percent of displacer length—standard
lengths for all sensors are 356 mm (14 inches) or 813
mm (32 inches). Other lengths available depending
on sensor construction
Liquid Density:
From 0 to 100 percent of
displacement force change obtained with given
displacer volume—standard volumes are 980 cm
3
(60
inches
3
) for 249C and 249CP sensors, or 1640 cm
3
(100 inches
3
) for most other 249 sensors; other
volumes available depending on construction
Output Signal
0.2 to 1.0 bar (3 to 15 psig) or 0.4 to 2.0 bar
(6 to 30 psig)
Action:
Field reversible between direct (increasing
liquid or interface level or specific gravity increases
output pressure) and reverse (increasing liquid or
interface level or specific gravity decreases output
pressure)
Area Ratio of Relay Diaphragms
3:1
Supply Medium
Air or Natural Gas
Supply medium must be clean, dry, and noncorrosive
Per ISA Standard 7.0.01
A maximum 40 micrometer particle size in the air
system is acceptable. Further filtration down to 5
micrometer particle size is recommended. Lubricant
content is not to exceed 1 ppm weight (w/w) or
volume (v/v) basis. Condensation in the air supply
should be minimized
Per ISO 8573-1
Maximum particle density size:
Class 7
Oil content:
Class 3
Pressure Dew Point:
Class 3 or at least 10
_
C less than
the lowest ambient temperature expected
Supply Pressure Requirement
1.4 bar
(20 psig) for 0.2 to 1.0 bar (3 to 15 psig)
output signal or 2.4 bar
(35 psig) for 0.4 to 2.0 bar
(6 to 30 psig) output signal
Maximum Supply Pressure
3.4 bar (50 psig)
Supply Pressure Consumption
At 1.4 bar (20 Psig)
Minimum:
0.11 normal m
3
/h (4.2 scfh) at proportional
band setting of 0 or 200 percent
Maximum:
0.72 normal m
3
/h (27 scfh) at proportional
band setting of 100 percent
At 2.4 bar (35 psig)
Minimum:
0.2 normal m
3
/h (7 scfh) at proportional
band setting of 0 or 200 percent
Maximum:
1.1 normal m
3
/h (42 scfh) at proportional
band setting of 100 percent
Performance
Hysteresis:
0.6 percent of output pressure change at
100 percent of proportional band
Repeatability:
0.2 percent of displacer length or
displacement force change
Dead Band:
0.05 percent of proportional band or
span
Typical Frequency Response:
4 Hz and 90‐degree
phase shift at 100 percent of proportional band with
output piped to typical instrument bellows using 6.1
meters (20 feet) of 6.4 mm (1/4 inch) tubing
Ambient Temperature Error:
$
1.5 percent of output
pressure change per 50
_
F (28
_
C) of temperature
change at 100 percent of proportional band when
using sensor with standard‐wall N05500 torque tube
with 249 sensors
Reset:
Adjustable from 0.01 to 74 minutes per repeat
(100 to 0.01 repeats per minute)
Differential Relief (2502F and 2502FR Controllers
Only):
Adjustable from 0.1 to 0.48 bar differential (2
to 7 psi) to relieve excessive difference between
proportional and reset pressures. Differential relief
can be switched between rising output pressure and
falling output pressure.
Standard Tubing Connections
1/4 NPT internal
Maximum Working Pressures (Sensors Only)
Consistent with applicable ASME
pressure/temperature ratings
(continued)
