Data Sheet

2500-249 Controllers and Transmitters
D200037X012
Product Bulletin
34.2:2500
July 2012
4
Table 1. Additional Specifications for Selected Fisher 2500 Controller Configurations
Control or Transmission Mode Controller
(1)
Full Output Signal Change Obtainable Over Input Of: Output Signal
Proportional control 2500, 2500C
(2)
Proportional band of 0 to 100 percent of displacer length or
displacement force change (10 to 100 percent recommended)
0.2 to 1.0 bar
(3 to 15 psig) or
0.4 to 2.0 bar
(6 to 30 psig)
Proportional‐plus‐reset control 2502, 2502C
(2)
Proportional band of 0 to 200 percent of displacer length or
displacement force change (20 to 200 percent recommended)
Proportional‐plus‐reset control with
anti‐reset windup
2502F
Differential
Gap (On‐off)
Control
With proportional valve
and full differential
gap adjustment
2500S, 2500SC
(2)
Differential gap of 0 to 100 percent of displacer length
0 and 1.4 bar
(0 and 20 psig) or
0 and 2.4 bar
(0 and 35 psig)
Without proportional
valve - has limited
differential gap
adjustment
2503
Differential gap of approximately 25 to 40 percent of displacer
length, when a 356 millimeter (14-inch) ideal‐volume displacer is
used on 1.0 specific gravity liquid level service and a standard 1.4
bar (20 psig) supply regulator setting is varied between 1.0 and 1.7
bar (15 and 25 psig)
(3)
0 and full supply
pressure
(4)
Proportional transmission 2500T, 2500TC
(2)
Span of 0 to 100 percent of displacer length or displacement force
change (20 to 100 percent recommended)
0.2 and 1.0 bar
(3 to 15 psig) or
0.4 to 2.0 bar
(6 to 30 psig)
1. The suffix R is added to the type number for reverse action, and all types have a 67CFR supply regulator mounted as standard.
2. The suffix C is added to the type number for indicator assembly.
3. Other displacer lengths and volumes, or service conditions, will result in other differential gaps.
4. 1.4 bar (20 psig) and 2.4 bar (35 psig) are the standard factory‐set supply regulator pressures, but these values will vary whenever the supply pressure is changed to adjust the differential gap.
Table 2. Allowable Process Temperatures for
Common Fisher 249 Sensor Component Materials
MATERIAL
PROCESS TEMPERATURE
Minimum Maximum
Cast Iron
(1)
-29_C (-20_F) 232_C (450_F)
Steel -29_C (-20_F) 427_C (800_F)
Stainless Steel -198_C (-325_F) 427_C (800_F)
N04400 -198_C (-325_F) 427_C (800_F)
Aluminum -195_C (-320_F) 99_C (210_F)
Gaskets
Graphite Laminate/SST
N04400/PTFE
Soft Iron Gasket
-198_C (-325_F)
-73_C (-100_F)
-29_C (-20_F)
427_C (800_F)
204_C (400_F)
427_C (800_F)
Bolting
B7 steel
B7M steel
B8M stainless steel
-46_C (-50_F)
-29_C (-20_F)
-198_C (-325_F)
427_C (800_F)
427_C (800_F)
427_C (800_F)
1. Cast iron may be used to -73_C (-100_F) provided a heat insulator is used below
-18_C (0_F) and stainless steel studs and nuts are used below -46_C (-50_F).
Table 3. Displacer and Torque Tube Materials
Part Standard Material Other Material
Displacer 304 Stainless Steel
316 Stainless Steel,
N10276, N04400,
Plastic, and Special
Alloys
Displacer Stem,
Driver Bearing,
Displacer Rod and Driver
316 Stainless Steel
N10276, N04400,
other Austenitic
Stainless Steels, and
Special Alloys
Torque Tube N05500
(1)
316 Stainless Steel,
N06600, N10276
1. N05500 is not recommended for spring applications above 232_C
(450_F). Contact your Emerson Process Management sales office or
application engineer if temperatures exceeding this limit are required.