Emerson Fisher 4195K Data Sheet

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Page 1

Product Bulletin

4195K Pressure Controllers

D200050X012

Fisherr 4195K Gauge Pressure Indicating Controllers

34.5:4195K July 2014

Fisher 4195K gauge pressure indicating controllers show process pressure and set point on an easy‐to‐read process scale. The controllers compare process pressure with an operator‐adjusted set point and delivers a pneumatic signal to a control element so that process pressure changes toward the set point. Controller types are available for proportional‐only,

proportional‐plus‐reset, proportional‐plus‐reset‐ plus‐rate, and differential gap for on‐off control. 4195K controllers are used in industries where accurate pressure control and process monitoring are required.

Unless otherwise noted, all NACE references are to NACE MR0175-2002.

W5660‐1

W5663‐1

YOKE‐MOUNTED CONTROLLER

Notes: 1 An internal cover protects the proportional band adjustment mechanism. In this photograph, the cover has been removed. 2 Controller components are indicated in figure 1.

www.Fisher.com

INTERIOR OF A FISHER 4195KBME CONTROLLER

Page 2

Product Bulletin

34.5:4195K July 2014

Specifications

4195K Pressure Controllers

D200050X012

Available Configurations

See table 1

Process Sensor Range (Input Signal)

Lower and Upper Range Limits: As shown in tables 2 and 5

Maximum Allowable Pressure:

As shown in tables 2 and 5

Process Scale

Standard scale is matched to the range of the sensing element, with exception of receiver controllers.

(1)

Optional scales available

Process Connections

Standard: 1/4 NPT internal stainless steel (all input ranges) Optional: 1/2 NPT adaptors (see table 3)

Output Signal

Proportional, Proportional‐Plus‐Reset, or Proportional‐Plus‐Reset‐Plus‐Rate Range:

1.0 bar (3 to 15 psig) or Differential Gap Range:

 0 to 2.4 bar (0 to 35 psig)

Action: Field‐reversible between

 0.4 to 2.0 bar (6 to 30 psig)  0 to 1.4 bar (0 to 20 psig) or

 direct (increasing

 0.2 to

sensed pressure increases output pressure), and

 reverse (increasing sensed pressure decreases

output pressure) action

Supply and Output Connections

1/4 NPT internal

Supply Pressure Requirements

(2)

See table 4

(continued)

Supply Pressure Medium

Air or natural gas

(3)

Remote Set Point Pressures

 0.2 to 1.0 bar (3 to 15 psig) or  0.4 to 2.0 bar

(6 to 30 psig)

Construction Materials

See table 6

Controller Adjustments

Proportional Band: 5 to 500% of process scale span Reset: Adjustable from 0.01 to more than 74 minutes

per repeat (from 100 to less than 0.0135 repeats per minute)

Rate: Adjustable from 0 to 20 minutes Differential Gap Controllers: Adjustable from 5 to

100% of process scale span Set Point: Adjustable from 0 to 100% of the scale span

Controller Performance

Repeatability: 0.4% of output span Dead Band: Less than 0.4% of process scale span Typical Frequency Response: 1.5 hertz and 90 degree

phase shift with 3.05 m (10 feet) of 6.4 mm (1/4‐inch) tubing and 1639 cm

Steady‐State Air Consumption

0.2 to 1.0 Bar (3 to 15 Psig) Output:

0.09 m

0.4 to 2.0 Bar (6 to 30 Psig) Output:

0.13 m

/hr (3.5 scfh)

/hr (5.0 scfh)

Delivery Capacity

0.2 to 1.0 Bar (3 to 15 Psig) Output:

6.4 m

/hr (240 scfh)

(100 cubic inch) volume

(4)(5)

(4)

0.4 to 2.0 Bar (6 to 30 Psig) Output:

9.4 m

/hr (350 scfh)

Table of Contents

Features 4.....................................

Construction Features 4.........................

Principle of Operation 8.........................

Proportional-Only Controllers 8..................

Proportional-Plus-Reset and

Proportional-Plus-Reset-Plus Rate Controllers 8..

Differential Gap Controllers 10..................

Remote Set Point Option 10....................

Auto/Manual Station Option 10..................

Anti-Reset Windup Option 11...................

External Feedback Option 11....................

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

Ordering Information 12.........................

Application 12................................

Construction 12...............................

Page 3

4195K Pressure Controllers

D200050X012

Specifications (continued)

Exhaust Capacity

0.2 to 1.0 Bar (3 to 15 Psig) Output:

/hr (186 scfh)

5.0 m

0.4 to 2.0 Bar (6 to 30 Psig) Output:

7.9 m

/hr (295 scfh)

(4)

Product Bulletin

34.5:4195K July 2014

Housing

Designed to NEMA 3 (Weatherproof) and IEC 529 IP54 Specifications

Operative Ambient Temperature Limits

-40 to 71C (−40 to 160F)

Hazardous Area Classification

(2)(6)

Mounting

Controller can be mounted on

 wall, or  pipestand

Complies with the requirements of ATEX Group II Category 2 Gas and Dust

Approximate Weight

4.5 kg (10 pounds)

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

1. Consult your Emerson Process Management sales office for additional information.

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

3. This product can be used with natural gas. Natural gas should not contain more than 20 ppm of H

4. Normal m

5. Without auto/manual station. With auto/manual station air consumption is 0.28 normal m

6. Also use these temperatures for transportation and storage limits.

/hr‐‐normal cubic meters per hour (m3/hr, 0C and 1.01325 bar, absolute). Scfh‐‐standard cubic feet per hour (ft3/hr, at 60F and 14.7 psig).

/hr (10.0 scfh).

Table 1. Available Configurations

MODES OPTIONS

TYPE

NUMBER

4195KA

4195KAE

4195KAM

4195KAME

4195KB 4195KBE 4195KBF

4195KBFE

4195KBM 4195KBME 4195KBFM

4195KBFME

4195KC 4195KCE 4195KCF

4195KCFE

4195KCM 4195KCME 4195KCFM

4195KCFME

4195KS

4195KSE

4195KSM 4195KSME

1. Reverse‐acting constructions are designated by the suffix letter R in the type number.

(1)

Proportional‐

Only

X X X X

- - -

Proportional‐

Plus‐Reset

- - -

- - X

X X X X X X X

- - -

Proportional‐

Plus‐Reset‐

Plus‐Rate

- - -

X X X X X X X X

- - -

Differential

Gap

- - -

X X X X

Anti‐Reset

Windup

(suffix letter F)

- - -

- - X X

- - -

- - X X

- - -

- - X X

- - -

- - X X

- - -

 actuator,  panel,

Remote

Set Point

(suffix letter M)

- - -

- - X X

- - -

- - X X X X

- - -

- - X X X X

- - -

- - X X

Internal Auto/

Manual Station

(suffix letter E)

- - X

Page 4

Product Bulletin

34.5:4195K July 2014

4195K Pressure Controllers

D200050X012

Features

n Easy Maintenance—Simple design allows fast, easy

maintenance and minimal spare parts inventory.

n Easy Adjustment—Adjusting the set point, the zero

and span of the process pointer, and switching between direct and reverse action are accomplished quickly and without special tools. Additionally, the set point and proportional band can be adjusted with no interaction between the two adjustments.

n Application Versatility—Either a Bourdon tube or

capsular input element is available to control a wide range of positive pressures, vacuum pressures, or compound pressures.

n Mounting Versatility—A 4195K controller can be

mounted directly on the actuator or it can mount on a pipestand, wall, or in a panel.

n Vibration Resistance—The simple design and low

mass of internal parts allow a 4195K controller to withstand the vibration levels encountered in most plant environments.

Construction Features

Simplified Relay Maintenance

A clean‐out wire provides a fast, easy means of cleaning the relay primary orifice during service.

Pressure Protection for the Case

A rubber plug in the plastic case pops out to relieve excessive pressure buildup inside the case.

Easy Direct/Reverse Switching

Controller action can be switched from direct to reverse or vice versa by simply loosening the screws on the proportional band cover and moving the cover out to rotate the proportional band knob to the desired action (see figure 1).

Easy Mode Conversion

Conversion from proportional to proportional‐plus‐reset control requires the addition of a reset valve and two pieces of tubing. Conversion from proportional to proportional‐plus‐reset‐plus‐rate control requires the addition of a reset/rate valve and three pieces of tubing. Conversion from proportional to differential gap for on/off control requires the addition of one piece of tubing.

n High‐Visibility Display—Two red pointers on a

114 mm (4 1/2‐inch) long, white‐on‐black scale show process pressure and deviation from set point at a glance. Two other gauges monitor supply pressure and output pressure.

n Low Air/Gas Consumption—The relay and nozzle

design reduces the steady-state consumption rate to as low as 0.09 m 6 scfh requirement set for the oil and gas industry by the US Environmental Protection Agency (New Source Performance Standards Subpart OOOO, EPA‐HQ‐QAR‐2010-0505).

n Corrosion Resistance—Tough, plastic housing resists

such corrosive environments as chemical plants and the salt spray atmosphere on an offshore oil platform. Internal constructions are available to resist a corrosive supply pressure media.

/hr (3.5 scfh); less than the

Anti‐Reset Windup

Anti‐reset windup is available with proportional‐plus‐reset controllers. A relief valve may be installed to limit reset windup in either direction.

Remote Set Point

The capability to adjust the set point from a remote location is available as an option on 4195K controllers.

Auto/Manual Capability

An optional internal auto/manual station permits smooth, bumpless transfer between automatic control and manual operation without disturbing the controller output. A positive‐acting, two‐position switch, showing either automatic or manual control mode, is clearly visible with the controller cover closed.

Page 5

4195K Pressure Controllers

D200050X012

Product Bulletin

34.5:4195K July 2014

Table 2. Process Sensor (Capsular Element) Pressure Ratings

(1)

CAPSULE

MATERIAL

Metric

units

N09902

Nickel Alloy

U.S. units

1. Minimum or maximum span or any span in between may be positioned anywhere within the operating range. For example, if a 0 to 350 mbar (0 to 5 psig) sensing element is used and the minimum span of 175 mbar (2.5 psig) is set, the process indication can be calibrated to a range of 340 mbar to 203 mbar (10 inch Hg to 6 inch Hg), 0 to 172 mbar (0 to 2.5 psig), 172 to 345 mbar (2.5 to 5 psig), 305 to 480 mbar (4.5 to 7 psig), or any value between minimum and maximum values of operating range.

2. Capsules with the travel stops set may be pressured to this value without permanent zero shift.

CAPSULAR

STANDARD RANGES

0 to 150 mbar 0 to 400 mbar 0 to 0.6 bar

Positive

pressure

Vacuum

Compound

Positive

pressure

Vacuum

Compound

0.2 to 1 bar 0 to 1 bar

0 to 1.4 bar 0 to 1.6 bar

0.4 to 2 bar 0 to 2 bar

-150 to 0 mbar

-340 to 0 mbar

-400 to 0 mbar

-0.6 to 0 bar

-1 to 0 bar

-50 to 100 mbar

-175 to 175 mbar

-150 to 250 mbar

-0.2 to 0.4 bar

-0.4 to 0.6 bar

-0.6 to 0.8 bar

-1 to 0.6 bar

-1 to 1 bar 0 to 60 inch wc

0 to 5 psig 0 to 10 psig 3 to 15 psig 0 to 15 psig

0 to 20 psig 6 to 30 psig 0 to 30 psig

-5 to 0 inch Hg

-10 to 0 inch Hg

-20 to 0 inch Hg

-30 to 0 inch Hg

-30 to 30 inch wc

-5 inch Hg to 2.5 psig

-10 inch Hg to 5 psig

-15 inch Hg to 7.5 psig

-20 inch Hg to 10 psig

-30 inch Hg to 15 psig

100 mbar 350 mbar

0.35 bar

0.4 bar

0.5 bar

0.7 bar 1 bar

0.8 bar 1 bar

85 mbar 170 mbar 350 mbar

0.35 bar

0.5 bar 100 mbar

175 mbar 350 mbar

0.35 bar

0.5 bar

0.7 bar 1 bar 1 bar

40 inch wc

2.5 psig 5 psig 6 psig

7.5 psig 10 psig

12 psig 15 psig

2.5 inch Hg 5 inch Hg 10 inch Hg 15 inch Hg

40 inch wc

2.5 psig 5 psig

7.5 psig 10 psig 15 psig

SPAN

Min Max Min Max

160 mbar 700 mbar

0.7 bar

0.8 bar 1 bar

1.4 bar 2 bar

1.6 bar 2 bar

170 mbar 340 mbar 700 mbar

0.7 bar 1 bar

160 mbar 350 mbar 700 mbar

0.7 bar 1 bar

1.4 bar 2 bar 2 bar

60 inch wc 5 psig 10 psig 12 psig 15 psig

20 psig 24 psig 30 psig

5 inch Hg 10 inch Hg 20 inch Hg 30 inch Hg

60 inch wc 5 psig 10 psig

15 psig 20 psig 30 psig

OPERATING RANGE

-350 mbar

-1 bar

-350 mbar

-480 mbar

-1 bar

-350 mbar

-480 mbar

-1 bar

-10 inch Hg

-14 inch Hg

-30 inch Hg

-10 inch Hg

-14 inch Hg

-30 inch Hg

-10 inch Hg

-14 inch Hg

-30 inch Hg

350 mbar 1 bar 1 bar

1.4 bar

1.7 bar

2.4 bar 2 bar

2.4 bar 350 mbar

480 mbar 1 bar 1 bar

1.4 bar 350 mbar

480 mbar 1 bar 1 bar

1.4 bar

1.7 bar

2.4 bar

2.4 bar 5 psig

7 psig 15 psig 20 psig 20 psig

25 psig 30 psig 35 psig

5 psig 7 psig 15 psig 20 psig

5 psig 7 psig 15 psig

20 psig 25 psig 35 psig

OPERATING

LIMIT

510 mbar

1.5 bar

1.5 bar 2 bar 2 bar

2.5 bar

3.5 bar 3 bar

3.5 bar 510 mbar

724 mbar

1.5 bar

1.5 bar 2 bar

510 mbar 724 mbar

1.5 bar

1.5 bar 2 bar

2.5 bar

3.5 bar

7.5 psig

10.5 psig

22.5 psig 30 psig 30 psig

37.5 psig 45 psig

52.5 psig

7.5 psig

10.5 psig

22.5 psig 30 psig

7.5 psig

10.5 psig

22.5 psig

30 psig

37.5 psig

52.5 psig

(2)

Table 3. Optional Process Connection Adaptors

BAR INPUT

RANGE

Up to 0 to 400

0 to 400 to 0 to 600

PSIG INPUT

RANGE

Up to 0 to 5000

0 to 5000 to 0 to 10,000

CONNECTION

Size Material

 1/2 NPT external or  1/2 NPT internal

1/2 NPT internal stainless

1/2 NPT external stainless

 steel or  stainless

steel

Table 4. Supply Pressure Data

Normal

Output Signal Range

0.2 to 1.0 or 0 and 1.4 (diff gap)

Bar

0.4 to 2.1 or 0 and 2.4 (diff gap)

3 to 15 or 0 and 20 (diff gap) 20 40

Psig

6 to 30 or 0 and 35 (diff gap) 35 40

1. If this pressure is exceeded, control stability may be impaired.

2. If this pressure is exceeded, damage to controller components may result.

Operating

Supply

(1)

Pressure

1.4 2.8

2.4 2.8

Maximum

Pressure

(2)

Limit

Page 6

Product Bulletin

34.5:4195K July 2014

4195K Pressure Controllers

D200050X012

Table 5. Process Sensor (Bourdon Tube) Pressure Ratings and Materials

(1)

1 2 2

3.5 7

20 20 55 76

160

15 30

50 100 150

300 750

1100 2200 3700

SPAN

2 4 4 7

14 40

70 100 200

60 100 200 300

600

1000 1500 3000 5000

BOURDON TUBES

0 to 1.6 0 to 2.5

0 to 4 0 to 6

Metric units

U.S. units

1. Minimum or maximum span or any span in between may be positioned anywhere within the operating range. For example, if a 0 to 2 bar (0 to 30 psig) sensing element is used and the minimum span of 1 bar (15 psig) is set, the process indication can be calibrated to a range of 1 to 0 bar (30 in. Hg to 0 psig), 0 to 1 bar (0 to 15 psig), 1 to 2 bar (15 to 30 psig), 2 to 3 bar (27 to 42 psig) or any value between minimum and maximum values of operating range.

2. Travel stops should be used when the maximum or minimum process pressure will be 5% over or under the calibrated range. For example, a 0 to 2 bar (0 to 30 psig) sensing element is calibrated for 0.7 to 2 bar (10 to 30 psig), the desired range. The minimum expected pressure is 0 psig and the maximum expected pressure is 2.8 bar (40 psig). Travel stops must be used to prevent excessive overtravel and undertravel since the maximum allowable overpressure and underpressure is higher than 5% of the 1.4 bar (20 psig) span which is

3. Bourdon tube without travel stops may be pressured to this value without permanent zero shift.

4. Bourdon tube with travel stops set may be pressured to this value without permanent zero shift.

0 to 10 0 to 25

0 to 40

0 to 60 0 to 100 0 to 160

Psig Psig Psig In. Hg Psig Psig Standard Material

0 to 30

0 to 60 0 to 100 0 to 200 0 to 300

0 to 600

0 to 1000 0 to 1500 0 to 3000 0 to 5000

Minimum Maximum Minimum Maximum

OPERATING RANGE

Bar

-1

-1 0

0 0 0 0

-30

-30 0

0 0 0 0

(2)

3 6

6 10 20

60 60 90

135 270

42 84

140 280 420

840 1300 1950 3900 6000

OPERATING

(3)

LIMITS

3.3

6.6

6.6 11 22

66 66

103 155 310

48 96

160 320 480

960 1500 2250 4500 7000

(4)

STANDARD MATERIAL

S31600

(316 SST)

S31600

±70 mbar (1 psig).

Table 6. Construction Materials

Part Standard Material Optional Material

Case and cover Polyester plastic - - -

Exterior tubing Copper

Exterior fittings C36000 (brass)

Interior tubing Copper S30400 (304 stainless steel)

Bourdon tube

Nozzle S30300 (303 stainless steel) - - -

Flapper S31600 - - -

Relay springs

Relay O‐rings Nitrile - - -

Relay diaphragms Nitrile - - -

Other relay metal parts

Feedback bellows assembly C51000 (bronze) S32100 (321 stainless steel)

Supply, output gauges Brass (wetted parts only) stainless steel (wetted parts only)

Remote set point element

Capsular input element N09902 nickel alloy S31600

1. Consult your Emerson Process Management sales office for information on other materials.

(1)

S31600 (316 stainless steel)

 S30200 (302 stainless steel), steel

 Aluminum,  stainless steel

 N09902 nickel alloy  S30300

 stainless steel, polyethylene

 N09902 nickel alloy,  N05500 nickel alloy (for NACE applications)

- - -

Page 7

4195K Pressure Controllers

D200050X012

Figure 1. Controller Construction Details

SET POINT INDICATOR

PROCESS PRESSURE INDICATOR

INPUT ELEMENT

(BOURDON TUBE)

REMOTE SET POINT ASSEMBLY

Product Bulletin

34.5:4195K July 2014

METAL BALL

SWITCHING ZONE INDICATOR

LOADER KNOB

AUTO/MANUAL SWITCH

W3679

AUTO/MANUAL STATION

W3439

PROPORTIONAL BAND ADJUSTMENT

W3712‐1

INPUT ELEMENT

ZERO ADJUSTMENT

W5660‐2

SUPPLY PRESSURE GAUGE

SET POINT SPAN ADJUSTMENT

RESET ADJUSTMENT (PROPORTIONAL‐PLUS‐RESET CONTROLLERS ONLY)

ADJUSTABLE RELIEF VALVE (ANTI‐RESET WINDUP)

OUTPUT PRESSURE GAUGE

RELAY

POINTER SPAN ADJUSTMENT

(CAPSULAR ELEMENT)

RATE ADJUSTMENT

W3599-1

Notes: 1 White portion of proportional band adjustment enables direct controller action; black portion enables reverse controller action. 2 For the process pointer. 3 Input element is a bourdon tube or a capsular element (as shown in inset) depending on input range. See tables 2 and 5.

FOR PROPORTIONAL‐PLUS‐

RESET‐PLUS‐RATE CONTROLLERS

RESET ADJUSTMENT

Page 8

Product Bulletin

34.5:4195K July 2014

4195K Pressure Controllers

D200050X012

Principle of Operation

Refer to the schematic diagrams in figures 2, 3, and 4. Refer to table 1 for a complete description of type number suffixes.

Proportional‐Only Controllers (4195KA)

The input element is connected to the process pointer and to the flapper by connecting links. As the process pressure increases (in a direct‐acting controller), the flapper moves toward the nozzle, restricting flow through the nozzle and increasing nozzle pressure. When this occurs, relay action increases the output pressure (delivery) of the controller. Output pressure is fed back to the proportional bellows. The action of the proportional bellows counteracts the flapper movement that resulted from the process pressure change and backs the flapper away from the nozzle until equilibrium is reached.

The set point adjustment changes the proximity of the nozzle and flapper as does a change in process pressure except that when the set point is changed, the nozzle moves with respect to the flapper.

Decreasing (narrowing) the proportional band moves the nozzle toward a position where more input and less feedback motion occurs, which increases the gain. The controller action is changed from direct to reverse by turning the proportional band adjustment knob to position the nozzle on the flapper quadrant to a point where the direction of the flapper motion versus input motion is reversed (see flapper detail in figure 2). With the controller in the reverse‐acting mode, an increase in process pressure causes a decrease in output pressure.

controllers, output pressure is fed back to the reset bellows as well as to the proportional bellows. In operation, proportional‐plus‐reset controllers minimize the offset between the process pressure and set point.

As the process pressure increases (in a direct‐acting controller), the flapper moves toward the nozzle, restricting flow through the nozzle and increasing nozzle pressure. When this occurs, relay action increases the output pressure (delivery) of the controller. Output pressure is fed back to the proportional bellows and to the reset bellows.

The action of the proportional bellows quickly counteracts the flapper movement that resulted from the process pressure change and backs the flapper away from the nozzle. Pressure in the reset bellows opposes the action of the proportional bellows and slowly moves the flapper closer to the nozzle. Thus, when the process pressure changes, proportional action temporarily reduces the gain of the controller for improved stability. The process pressure then slowly returns to set point, as pressure in both bellows equalizes via the reset action.

The set point adjustment changes the proximity of the nozzle and flapper as does a change in process pressure. However, when the set point changes, the nozzle moves with respect to the flapper.

The proportional band adjustment knob positions the nozzle on the flapper. Increasing (widening) the proportional band moves the nozzle to a position on the flapper where less input and more feedback motion occurs, which decreases the gain of the controller. Decreasing (narrowing) the proportional band moves the nozzle toward a position where more input and less feedback motion occurs, which increases the gain.

The controller action is changed from direct to reverse by turning the proportional band adjustment knob to position the nozzle on the flapper quadrant to a point where the direction of the flapper motion versus input motion is reversed. With the controller in the reverse‐acting mode, an increase in process pressure causes a decrease in output pressure.

Proportional‐Plus‐Reset and Proportional‐Plus‐ Reset‐Plus‐Rate Controllers (4195KB and KC)

The operation of proportional‐plus‐reset controllers (4195KB) is similar to that of proportional‐only controllers (described above). However, in 4195KB

A 4195KC controller also has a rate valve, which is an adjustable restriction that momentarily increases the controller gain to accelerate the corrective action for slow pressure systems. A proportional‐plus‐reset‐plus‐ rate controller responds to a change in process pressure as follows: First, the rate action delays the proportional action just long enough to allow the

Page 9

4195K Pressure Controllers

D200050X012

Figure 2. Schematic of Fisher 4195K Controllers

Product Bulletin

34.5:4195K July 2014

MANUAL SET POINT ADJUSTMENT

PROCESS POINTER REMOTE SET POINT

CONNECTED HERE

INPUT ELEMENT

CONNECTED HERE

CONNECTING

LINK

BEAM

TO RESET BELLOWS

TO PROPORTIONAL BELLOWS

RESET VALVE

PROPORTIONAL‐PLUS‐RESET

CONTROL

SUPPLY PRESSURE

OUTPUT PRESSURE

NOZZLE PRESSURE

RESET PRESSURE

PROPORTIONAL PRESSURE

TO RESET

TO PROPORTIONAL BELLOWS

BELLOWS

PROPORTIONAL BELLOWS

FLAPPER

NOZZLE

TO NOZZLE

TO POSITIVE FEEDBACK BELLOWS (RESET BELLOWS)

TO NOZZLE

RESET BELLOWS (VENTED)

PROPORTIONAL‐ONLY

OUTPUT PRESSURE TO FINAL CONTROL ELEMENT

RELAY

SUPPLY PRESSURE

TO NOZZLE

SUPPLY PRESSURE

DIFFERENTIAL GAP CONTROL

OUTPUT PRESSURE TO FINAL CONTROL ELEMENT

PROPORTIONAL BAND ADJUSTMENT

CONTROL

OUTPUT PRESSURE TO FINAL CONTROL ELEMENT

DIRECT ACTION QUADRANT

SUPPLY PRESSURE

TO PROPORTIONAL BELLOWS

RELAY

TO PROPORTIONAL BELLOWS

REVERSE ACTION QUADRANT

FEEDBACK LINK

FEEDBACK

MOTION

INPUT MOTION

FLAPPER PIVOT

FLAPPER DETAIL

OUTPUT PRESSURE TO FINAL CONTROL ELEMENT

RELAY

TO RESET BELLOWS

DIFFERENTIAL RELIEF VALVE

TO NOZZLE

RESET VALVE

OUTPUT

RELAY

SUPPLY PRESSURE

PROPORTIONAL‐PLUS‐RESET CONTROL

WITH ANTI‐RESET WINDUP

TO RESET BELLOWS

TO NOZZLE

OUTPUT

RELAY

46A9764‐C C0756‐2

RELAY

SUPPLY

RATE VALVE

RESET VALVE

PRESSURE

PROPORTIONAL‐PLUS‐RESET‐PLUS‐RATE CONTROL

DIFFERENTIAL RELIEF VALVE

RATE VALVE

RESET VALVE

PROPORTIONAL‐PLUS‐RESET‐PLUS‐RATE

CONTROL WITH ANTI‐RESET WINDUP

SUPPLY PRESSURE

Page 10

Product Bulletin

34.5:4195K July 2014

4195K Pressure Controllers

D200050X012

controller to respond to the change quickly with high gain, but not long enough for the high gain to cause instability. Then, the low gain provided by the proportional action keeps the system stable. Finally, reset action slowly increases the gain and returns the process pressure toward the set point.

Differential Gap (For On‐Off Control) Controllers (4195KS)

The operation of differential gap controllers (4195KS) is similar to that of proportional‐only controllers (described above). However, in 4195KS controllers, as the process pressure increases, approaching the upper switching point, the flapper moves toward the nozzle (in a direct‐acting controller). This movement restricts the flow through the nozzle and increases nozzle pressure. When this occurs, relay action increases the output pressure (delivery) of the controller. Output pressure is fed back to the positive feedback bellows. The action of the positive feedback bellows moves the flapper closer to the nozzle, increasing nozzle pressure, which in turn, increases the relay output. Output pressure to the final control element switches to full supply pressure.

switching point. On a reverse‐acting controller, changing the proportional band adjustment will widen or narrow the differential gap between the two switching points by moving the position of the upper switching point.

Remote Set Point Option (Suffix Letter M)

The capability to adjust the controller set point from a remote location is available for all 4195KA controllers. With this option, a control pressure is applied to the capsular element within the remote set point assembly. The expansion and contraction of the capsule moves the set point adjustment via connecting linkage. Increasing the control pressure to the capsule increases the set point setting, and decreasing the control pressure reduces the set point setting. This option is designated by the letter M in the type number.

Auto/Manual Station Option (Suffix Letter E)

As the process pressure decreases, approaching the lower switching point, the flapper moves away from the nozzle (in a direct‐acting controller) reducing nozzle pressure. Through relay action, pressure to the positive feedback bellows is reduced, moving the flapper farther away from the nozzle, and further reducing nozzle pressure. Output pressure to the final control element switches to zero.

The set point adjustment changes the proximity of the nozzle and flapper as does a change in process pressure except that, when the set point is changed, the nozzle moves with respect to the flapper. The set point adjustment moves both the upper and lower switching points.

The proportional band knob positions the nozzle on the flapper. Increasing (widening) the proportional band moves the nozzle away from the input connection. When the proportional band adjustment moves the nozzle across the feedback connection, the controller action changes between direct and reverse. On a direct‐acting controller, changing the proportional band adjustment will widen or narrow the differential gap between the two switching points. This is accomplished by moving the position of the lower

A controller with the auto/manual option (designated by the letter E in the type number) has piping on the output side of the relay as shown in figure 3. Supply pressure to the relay is also applied to the manual loader. The manual loader, functioning as a regulator, applies pressure to one side of the plastic tube and to the auto/manual switch. Output pressure from the relay registers on the other side of the plastic tube as well as in the auto/manual switch.

When the auto/manual switch is in the MANUAL position, the manual loader output is channeled through the auto/manual switch and becomes the controller output. When the auto/manual switch is in the AUTO position, the relay output is channeled through the switch to become the controller output.

Before the auto/manual switch is operated, the relay output must equal the manual loader output to avoid bumping the process. Adjusting the set point varies the pressure on the left‐hand side of the plastic tube. Adjusting the manual loader knob varies the pressure on the right‐hand side of the plastic tube. When the pressures are equal, the metal ball is centered in the tube and is held in place by a small magnet. Pressure imbalance forces the ball to one end of the tube where it forms a seal, blocking air flow through the tube.

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4195K Pressure Controllers

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Figure 3. Schematic of Auto/Manual Station

Product Bulletin

34.5:4195K July 2014

AUTOMATIC POSITION

OUTPUT PRESSURE TO FINAL CONTROL ELEMENT

RELAY OUTPUT PRESSURE

SUPPLY PRESSURE

MANUAL LOADER OUTPUT PRESSURE

48A5230‐A A2927‐2

SUPPLY PRESSURE

Anti‐Reset Windup Option (Suffix Letter F)

Anti‐reset windup is available for all 4195KB and KC controllers and is designated by the letter F in the type number. The differential relief valve operates when the difference between the proportional bellows pressure and the reset bellows pressure reaches a predetermined value. Anti‐reset windup reduces overshoot of the process pressure that can result from a large or prolonged deviation from set point.

External Feedback Option

External feedback is available for all 4195KB controllers. Controllers with this option have an external connection on the bottom of the controller case (see figure 6). This connection breaks the positive feedback (reset) loop inside the controller and brings it outside (see figure 4).

The connection allows the positive feedback loops of two controllers (primary and secondary) to be tied together when the controllers are used in an override application. When connected, the secondary controller reset pressure tracks the primary controller output pressure, minimizing reset windup in the secondary controller.

AUTO/MANUAL SWITCH

RELAY

Figure 4. Schematic of External Feedback Option

TO PROPORTIONAL BELLOWS

47A0975-A A3342-1

PLASTIC TUBE

METAL BALL

OUTPUT PRESSURE TO FINAL CONTROL ELEMENT

TO RESET BELLOWS

RESET VALVE

EXTERNAL FEEDBACK TO OUTPUT OF HIGH OR LOW SELECT RELAY

SUPPLY PRESSURE

OUTPUT PRESSURE

MANUAL LOADER

MANUAL LOADER KNOB

MANUAL POSITION

AUTO/MANUAL SWITCH

TO NOZZLE

OUTPUT

RELAY

SUPPLY PRESSURE

NOZZLE PRESSURE

RESET PRESSURE

SELECT RELAY OUTPUT

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Product Bulletin

34.5:4195K July 2014

4195K Pressure Controllers

D200050X012

Installation

4195K gauge pressure controllers can be shipped alone for a separate installation or for installation on a control valve actuator. The controllers can also be mounted on a pipe stand, on a wall, or in a panel. When a controller is mounted on an actuator and a positioner is not used, the controller will usually be opposite the supply regulator as shown in figure 5. If a positioner is used, the supply regulator can be mounted on the actuator casing.

The controller must be installed so the vent points down. Basic controller dimensions are shown in figure 6. Dimensions for specific mounting configurations are shown in figure 7.

Ordering Information

When ordering a 4195K controller, specify:

Application

1. Description of the service, such as throttling or on‐off

2. Pressure range, composition, and temperature of process fluid

3. Ambient temperature

Figure 5. Typical Yoke Mounting

657 ACTUATOR

4195K

CONTROLLER

67FR FILTER REGULATOR

MOUNTING PLATE

W5661

Construction

Refer to the specifications and to the Construction Features section. Carefully review each specification and feature, indicating your choice whenever a selection is to be made. Refer to table 1 for type numbers; add an R to any type number if reverse action is desired.

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4195K Pressure Controllers

D200050X012

Figure 6. Controller Dimensions and Connections

260

(10.25)

330 (13.00)

130

(5.13)

102

(4.00)

(2.00)

Product Bulletin

34.5:4195K July 2014

5/16‐18 UNC‐2B 3 HOLES (MOUNTING)

87 (3.44)

255 (10.04)

FRONT VIEW

1/4‐18 NPT CONTROLLER OUTPUT CONNECTION

1/4‐18 NPT VENT CONNECTION

1/4‐18 NPT SUPPLY PRESSURE CONNECTION

147

(5.80)

(2.56)

(1.22)

1/4 NPT 4 HOLES

REAR VIEW

1/4 NPT REMOTE SET POINT CONNECTION

BOTTOM VIEW TOP VIEW

(INCH)

Notes: 1 1/4-18 NPT process connection (marked A) for all bourdon tube controllers and for those capsular element controllers used in vacuum pressure applications. 2 1/4-18 NPT process connection (marked B) for capsular element controllers used in positive and compound pressure applications. 3 For the external feedback connections (4195KB controllers only), either the A or B connection is used, depending on the location of the process connection.

46A9765‐A A2892‐4

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Product Bulletin

34.5:4195K July 2014

Figure 7. Mounting Dimensions

4195K Pressure Controllers

D200050X012

(3.62)

TOP VIEW

HORIZONTAL PIPE

222

(8.75)

(2.43)

36A9757‐A

SIDE VIEW VERTICAL PIPE

PIPESTAND MOUNTING

(3.29)

(2.49)

(0.50)

(2.43)

(3.75)

161

(6.35)

TOP VIEW

260

(10.25)

B1473‐3

36A9759‐A

REAR VIEW

PANEL MOUNTING WALL MOUNTING

14R

(0.56)

236

(9.31)

306

(12.06)

(0.50)

36A9761‐B

152

(6.00)

(2.43)

(0.50)

REAR VIEWDIMENSIONS OF PANEL CUTOUT

(INCH)

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4195K Pressure Controllers

D200050X012

Product Bulletin

34.5:4195K July 2014

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Product Bulletin

34.5:4195K July 2014

4195K Pressure Controllers

D200050X012

Neither Emerson, Emerson Process Management, nor any of their affiliated entities assumes responsibility for the selection, use or maintenance of any product. Responsibility for proper selection, use, and maintenance of any product remains solely with the purchaser and end user.

Fisher is a mark owned by one of the companies in the Emerson Process Management business unit of Emerson Electric Co. Emerson Process Management, Emerson, and the Emerson logo are trademarks and service marks of Emerson Electric Co. All other marks are the property of their respective owners.

The contents of this publication are presented for informational purposes only, and while every effort has been made to ensure their accuracy, they are not to be construed as warranties or guarantees, express or implied, regarding the products or services described herein or their use or applicability. All sales are governed by our terms and conditions, which are available upon request. We reserve the right to modify or improve the designs or specifications of such products at any time without notice.

Emerson Process Management

Marshalltown, Iowa 50158 USA Sorocaba, 18087 Brazil Chatham, Kent ME4 4QZ UK Dubai, United Arab Emirates Singapore 128461 Singapore

www.Fisher.com

Emerson Fisher 4195K Data Sheet

Specifications and Main Features

Frequently Asked Questions

User Manual