Emerson Fisher 249, Fisher 249P, Fisher 249VS, Fisher 249W, Fisher 2500 Data Sheet

...

Product Bulletin

2500-249 Controllers and Transmitters

D200037X012

34.2:2500 July 2012

Fisherr 2500‐249 Pneumatic Controllers and Transmitters

Typical caged and cageless sensor/instrument configurations are shown below and in figure 1. Caged sensors (figure 2) provide more stable operation than do cageless sensors (figure 3) for vessels with internal obstructions or considerable internal turbulence. Cageless sensors are generally used on specific gravity and interface control applications requiring large displacers that are more easily accommodated by flange connections up to NPS 8. The availability of many different displacer stem lengths permits lowering the displacer down to the most advantageous depth in the vessel.

CAGELESS SENSORS CAN MOUNT

ON VESSEL SIDE OR TOP WITH

DISPLACER INSIDE VESSEL

Fisher pneumatic controllers and transmitters are used wherever rugged, dependable, and simply constructed displacer‐style pneumatic instrumentation is required in liquid level, interface level, or density service. The ruggedness of these products is demonstrated by their use in many kinds of demanding applications, including those in the power, chemical process, oil and gas production, and petrochemical industries.

STANDARD CAGED SENSORS

MOUNT ON VESSEL SIDE WITH

DISPLACER INSIDE CAGE

W9354‐1

www.Fisher.com

W8334

FISHER L3 PNEUMATIC LEVEL CONTROLLER

(2500 CONTROLLER IN COMBINATION WITH A

249W SENSOR) CAN MOUNT ON VESSEL TOP OR

BE INSTALLED IN A CUSTOMER‐SUPPLIED CAGE

W8679

Product Bulletin

34.2:2500 July 2012

Specifications

2500-249 Controllers and Transmitters

D200037X012

Available Configurations

See tables 1, 5, and 6

Input Signal

Fluid Level or Fluid‐to‐Fluid Interface Level: From 0 to 100 percent of displacer length—standard lengths for all sensors are

J 356 mm (14 inches) or J 813 mm

(32 inches); other lengths available depending on sensor construction Fluid Density: From 0 to 100 percent of displacement force change obtained with given displacer volume—standard volumes are

J 980 cm

J 1640 cm

(60 inches3) for 249C and 249CP sensors

(100 inches3) for most other sensors; other volumes available depending upon sensor construction

Allowable Specific Gravity

Specific gravity with standard volume displacers and standard wall torque tubes:

Fluid Level and Fluid‐to‐Fluid Interface

2500 Controllers, except 2503 and 2503R: Specific gravity range, 0.20 to 1.10 2503 and 2503R: Specific gravity range, 0.25 to 1.10

Fluid Density

2500 Controllers, except 2503 and 2503R: Minimum change in specific gravity, 0.20 2503 and 2503R: Minimum change in specific gravity,

0.25

Contact your Emerson Process Management sales office for information on non‐standard applications

Output Signal

See table 1

Output Action

J Direct (increasing fluid or interface level or specific

gravity increases output pressure) or

J Reverse (increasing fluid or interface level or

specific gravity decreases output pressure)

Area Ratio of Relay Diaphragms

3:1

Supply Pressure

(1)

Normal Operation: See table 4.

Maximum to Prevent Internal Part Rupture

(2)

3 bar (45 psig)

‐continued‐

Steady‐State Air Consumption

See table 4

Proportional Band, Differential Gap, or Span

See table 1

Set Point (Controllers Only)

Continuously adjustable to position control point or differential gap of less than 100 percent anywhere within displacer length (fluid or interface level) or displacement force change (density)

Zero Adjustment (Transmitters Only)

Continuously adjustable to position span of less than 100 percent anywhere within displacer length (fluid or interface level) or displacement force change (density)

Performance

Independent Linearity (Transmitters Only):

1 percent of output pressure change at span of 100 percent Hysteresis: 0.6 percent of output pressure change at 100 percent of proportional band, differential gap, or span Repeatability: 0.2 percent of displacer length or displacement force change

Deadband (Except Differential Gap Controllers

(3)

0.05 percent of proportional band or span Typical Frequency Response: 4 Hz and 90‐degree phase shift at 100 percent of proportional band, differential gap, or span 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 28_C (50_F) of temperature change at 100 percent of proportional band, differential gap, or span when using sensor with standard wall N05500 torque tube

Reset (Proportional‐Plus‐Reset Controllers Only):

Continuously adjustable from 0.005 to over 0.9 minutes per repeat (from 200 to under 1.1 repeats per minute)

Anti‐Reset Differential Relief (2502F and 2502FR Controllers Only): Continuously adjustable from 0.14

to 0.48 bar (2 to 7 psi) differential to relieve excessive difference between proportional and reset pressures

2500-249 Controllers and Transmitters

D200037X012

Specifications (Continued)

Standard Tubing Connections

1/4 NPT internal

Allowable Process Temperatures

See table 2

Product Bulletin

34.2:2500 July 2012

(1)

Sensor Connection Sizes

See tables 5 and 6

Maximum Working Pressures (Sensors Only)

(1)

Hazardous Area Classification

2500 controllers comply with the requirements of ATEX Group II Category 2 Gas and Dust

Consistent with applicable ASME pressure/temperature ratings for the specific sensor constructions shown in tables 5 and 6

Operative Ambient Temperatures

(1)

Construction Materials

See tables 2, 3, and 7

Controller.

J Standard: -40 to 71_C (-40 to 160_F) J High Temperature: -18 to 104_C (0 to 220_F)

Sensor.

Mounting Positions

See figure 9

See table 2 For ambient temperature ranges, guidelines, and use of optional heat insulator, see figure 4

Caged Sensor Connection Styles

See figure 10

Standard Supply and Output Pressure Gauge Indications

See table 4

NOTE: Specialized instrument terms are defined in ANSI/ISA Standard 51.1 - Process Instrument Terminology.

1. The pressure/temperature limits in this document and any applicable code or standard should not be exceeded.

2. Also see Supply Pressure Overpressure Protection section.

3. For 2500S, 2500SC, and 2503 adjusting the differential gap is equivalent to adjusting the deadband.

Options

See Options section

Table of Contents

Specifications 2................................

Features 5.....................................

Supply Pressure Overpressure Protection 10........

Principle of Operation 10........................

Proportional Controller or Transmitter 11.........

Proportional-Plus-Reset Controller 11............

Anti-Resetup Windup 12.......................

On-Off Controller With Proportional Valve 12......

On-Off Controller Without Proportional Valve 12...

Options 12....................................

Installation 12.................................

Ordering Information 15.........................

Construction 15................................

Product Bulletin

34.2:2500 July 2012

2500-249 Controllers and Transmitters

D200037X012

Table 1. Additional Specifications for Selected Fisher 2500 Controller Configurations

Control or Transmission Mode Controller

Proportional control 2500, 2500C

Proportional‐plus‐reset control 2502, 2502C Proportional‐plus‐reset control with

anti‐reset windup

With proportional valve and full differential

Differential Gap (On‐off) Control

Proportional transmission 2500T, 2500TC

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.

gap adjustment

Without proportional valve - has limited differential gap adjustment

2502F

2500S, 2500SC

2503

Table 2. Allowable Process Temperatures for Common Fisher 249 Sensor Component Materials

MATERIAL

(1)

Cast Iron

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

Bolting

B7 steel B7M steel B8M stainless steel

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).

PROCESS TEMPERATURE

Minimum Maximum

-29_C (-20_F) 232_C (450_F)

-198_C (-325_F)

-73_C (-100_F)

-29_C (-20_F)

-46_C (-50_F)

-29_C (-20_F)

-198_C (-325_F)

(1)

(2)

427_C (800_F) 204_C (400_F) 427_C (800_F)

427_C (800_F) 427_C (800_F) 427_C (800_F)

Full Output Signal Change Obtainable Over Input Of: Output Signal

Proportional band of 0 to 100 percent of displacer length or displacement force change (10 to 100 percent recommended)

Proportional band of 0 to 200 percent of displacer length or displacement force change (20 to 200 percent recommended)

Differential gap of 0 to 100 percent of displacer length

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)

Span of 0 to 100 percent of displacer length or displacement force change (20 to 100 percent recommended)

(3)

0.2 to 1.0 bar (3 to 15 psig) or

0.4 to 2.0 bar (6 to 30 psig)

0 and 1.4 bar (0 and 20 psig) or 0 and 2.4 bar (0 and 35 psig)

0 and full supply pressure

0.2 and 1.0 bar (3 to 15 psig) or

0.4 to 2.0 bar (6 to 30 psig)

Table 3. Displacer and Torque Tube Materials

Part Standard Material Other Material

316 Stainless Steel,

Displacer 304 Stainless Steel

Displacer Stem, Driver Bearing, Displacer Rod and Driver

Torque Tube N05500

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.

316 Stainless Steel

(1)

N10276, N04400, Plastic, and Special Alloys

N10276, N04400, other Austenitic Stainless Steels, and Special Alloys

316 Stainless Steel, N06600, N10276

(4)

2500-249 Controllers and Transmitters

D200037X012

Table 4. Supply Pressure Data

OUTPUT SIGNAL

0.2 to 1.0 bar (3 to 15 psig), except 0 and 1.4 bar (0 and 20

(2)

psig)

for on‐off controllers

0.4 to 2.0 bar (6 to 30 psig), except 0 and 2.4 bar (0 and 35

(2)

psig)

for on‐off controllers

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

/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.

STANDARD SUPPLY AND OUTPUT

PRESSURE GAUGE INDICATIONS

0 to 30 psig 1.4 20 0.11 0.72 4.2 27

0 to 60 psig 2.4 35 0.19 1.1 7 42

NORMAL OPERATING

(1)

SUPPLY PRESSURE

(2)

Bar Psig Min

Product Bulletin

AIR CONSUMPTION AT NORMAL OPERATING SUPPLY PRESSURE

Normal m3/h

(4)

Max

(6)

(5)

Min

(4)

34.2:2500 July 2012

(3)

(6)

Scfh

Max

(5)

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.

+ 11 hidden pages