Emerson Fisher 4660 Data Sheet

4660 Pressure Pilot

D200051X012

Fisherr 4660 High-Low Pressure Pilot

The Fisher 4660 pneumatic high-low pressure pilot
activates safety shutdown systems for flowlines,
production vessels, and compressors. This pilot is
available with either single or dual set point capability,
using switch points to maintain full output pressure
when the process pressure is within the set point
range. If the process pressure is outside this range, the
pilot switches from full output pressure to zero output
pressure.

The primary switching mechanism in this pilot is a
block-and-bleed relay assembly. This construction can
be used in both block-and-bleed and bleed-only
systems.

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

X0231

Product Bulletin

34.5:4660

January 2014

Features

n Safety Certification—The 4660 is certified for use in

Safety Instrumented System (SIS) applications.
Certification is by exida Consulting LLC, a global
provider of functional safety and control system
security (see figure 1). SIS certification is identified
on the product by a label affixed to the case.

The functional safety assessment was performed to
the requirements of IEC 61508: ed2, 2010, SIL3 for
mechanical components.

n Superior Performance—Repeatability meets the U.S.

Minerals Management Service test tolerances
referenced in Outer Continental Shelf (OCS) Order
No. 5 and defined in the American Petroleum
Institute (API) RP14C standard.

n Cost-Effective Design—One pilot provides either a

high-low function or a single switch point,
whichever the application requires.

FISHER 4660 HIGH-LOW PRESSURE PILOT

WITH BLOCK AND BLEED RELAY

Figure 1. exida Certificate

www.Fisher.com

Product Bulletin

34.5:4660
January 2014

4660 Pressure Pilot

D200051X012

n NACE Conformance—A NACE compliant Bourdon

tube is available for those applications where the
pilot must meet the requirements of NACE
MR0175-2002.

n Environmental Packaging—Construction materials

have been selected to protect the pilot from
corrosive environments such as the salt spray
atmosphere of offshore platforms.

n Reliable Operation—The pilot uses a field-proven

Bourdon tube process pressure sensing element,
shown in figure 2, that reduces maintenance by
eliminating the need for wetted dynamic O-rings.

n Reduced Air/Gas Consumption—The 4660

pneumatic high-low pressure pilot is an energy
efficient choice. The low bleed relay provides a
steady state consumption rate that is less than the
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 Vibration Resistance—The rugged Bourdon tube

sensing element and shock-absorbing switch points
dampen the effects of vibration while maintaining
performance.

n Set Point Accuracy—Standard high-resolution set

point adjustments are easy to set, non-interactive,
and can be locked in place to maintain the desired
set point. The optional set point indication
assemblies on the front panel are easy to read and
let you simply dial in the desired set point.

Figure 2. Fisher 4660 High-Low Pressure Pilot with
Block and Bleed Relay; Left Side with Case Cover Off

SET POINT ADJUSTMENTS

X0232

n Easy Maintenance—Simple modular construction

BOURDON TUBE

BLOCK AND
BLEED RELAY

plus a line of prepackaged parts kits makes pilot
maintenance fast and easy.

n Installation Versatility—Panel, rack, pipestand, or

actuator mounting is available to meet field
requirements.

n Operational Indications—A supply pressure test

function is provided. The optional output indicator
lets you check at a glance whether the pilot output
pressure is at full output or zero output pressure.

Table of Contents

Features 1.....................................

Principle of Operation 6.........................

Performance 6.................................

Applications 7.................................

2

Installation 7..................................

Ordering Information 11.........................

Application 11................................

Construction 11...............................

4660 Pressure Pilot

D200051X012

Specifications

Product Bulletin

34.5:4660

January 2014

Available Configurations

J High-low, J low-only, or J high-only set point

capability

Input Signal

Type: Process pressure sensed with a Bourdon tube
Bourdon Tube Ratings: See table 1 or 2
Overpressure Protection: Maximum allowable

emergency process pressures and maximum
allowable process pressures to ensure set point
readjustability are shown in table 3

Output Signal

J Zero pressure or J full supply pressure

(automatically resets)

Supply Pressure

(1)

Normal Operating Pressure: 1.4 to 4.4 bar
(20 to 65 psig)
Medium: Air or natural gas

(2)

Quality: Should be dry with solid particles removed

Steady-State Air Consumption

(3)

Output Signal at 0 psig: ≤0.134 normal m3/hr
(≤5 scfh)

Output Signal at Full Supply Pressure:

≤0.00134 normal m3/hr (≤0.05 scfh)

Exhaust Capacity

≥15

C

g

Construction Materials

Case and Cover: Polyester
Front Cover: Tinted polycarbonate with

scratch-resistant coating

Base: Hard-anodized nickel-sealed aluminum alloy
Bourdon Tube:

J S31600 SST or J NACE compliant

material

Relay Body, Relay Flange, Nozzle/Flapper Assembly
Orifice Block, and Switch Point. Housings: Glass-filled

polyphenylene sulfide

Relay Diaphragm: Fluorosilicone/Polyester
Relay Discs: Fluorosilicone
Process Pressure Block, Tubing, Front Plate, Flapper,
Linkages, and Other Major Metal Parts: Stainless steel
Gaskets: Chloroprene and nitrile
O-Rings.

Relay: Nitrile
Switchpoint Assembly: Nitrile impregnated with

molybdenum disulphide
Base/Case: Nitrile

Operating Conditions

Condition Normal Operating Limits

Ambient

Temperature

(1)

Nominal

Reference

-59 to 71_C (-75 to 160_F) 21_C (70_F)

Set Point Adjustments

Continuously adjustable between 3% and 97% of
Bourdon tube rating; see table 1 or 2 for ranges

Performance in Percentage of Bourdon Tube Rating

Repeatability:
Set Point ΔP

≤0.25%

.

min

(See table 1 or 2)
Single High-Low Unit: 10% for up to 170 bar (2500
psig) Bourdon tubes; 15% for 350, 500, and 700
(NACE) bar (5000, 7500, and 10,000 (NACE) psig)
Bourdon tubes
Low-Only and High-Only Pair: 3%

Trip-to-Reset Zone: ≤1.5% (see table 1 or 2)

Operating Influences on Switch Point Sensitivity

Supply Pressure: ≤0.05% of Bourdon tube rating for a
10% change in supply pressure

Ambient Temperature: ≤2% of Bourdon tube rating
throughout normal operating limits with nominal
reference

Time: ≤1% of Bourdon tube rating over 30 days at
ambient temperature nominal reference

Process Pressure: Range shift or set point drift can
occur if process pressure exceeds the Bourdon tube
rating

Pressure Connections

1/4 NPT internal

-continued-

3

Product Bulletin

34.5:4660
January 2014

Specifications (continued)

4660 Pressure Pilot

D200051X012

Mounting

J Panel, J rack, J pipestand, or J actuator

Safety Instrumented System Classification

SIL3 capable  certified by exida Consulting LLC

Approximate Weight

Hazardous Area Classification

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

2.3 kg (5 pounds)

Options

J Visual output indication J stainless steel panel

mounting flange,

J tamper-resistant front cover

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 standard or code limitation for valve should not be exceeded.

2. Natural gas to contain no more than 20 ppm of H

3. Normal m

3

/h--Normal cubic meters per hour at 0_C and 1.01325 bar, absolute. Scfh--Standard cubic feet per hour at 60_F and 14.7 psia.

S.

2

Table 1. Additional Specifications, Bar

BOURDON TUBE

7
17
35
70

100
170
350
500
700

1. Rating indicated on Bourdon tube and set range on front panel are in kPa (1 bar = 100 kPa).

2. Available in NACE compliant material only.

RATING

(2)

(1)

SET RANGE

0.6 to 16.6

1.1 to 33.4

2.1 to 67.9

3.2 to 100.2

5.2 to 167.2

10.4 to 334.4

15.6 to 501.5

20.7 to 668.8

(1)

Single High-Low Unit

0.3 to 6.6

SET POINT ΔP

ALLOWABLE DIFFERENCE

BETWEEN HIGH AND LOW SETTINGS)

0.7

1.7

3.5

6.9

10.3

17.2

51.7

70.7

103.4

(MINIMUM

MIN

J set point indication, and

High-Only/

Low-Only Pair

0.2

0.5

1.0

2.1

3.1

5.2

10.3

15.5

20.7

TRIP-TO-RESET ZONE

≤0.1

0.3

0.5

1.0

1.6

2.6

5.2

7.8

10.3

Table 2. Additional Specifications, Psig

BOURDON TUBE

RATING

100
250
500
1000

1500
2500
5000
7500

(1)

10,000

1. Available in NACE compliant material only.

4

SET RANGE

3 to 97
8 to 242
5 to 485

30 to 970

45 to 1455

75 to 2425
150 to 4850
225 to 7275
300 to 9700

SET POINT ΔP

ALLOWABLE DIFFERENCE

BETWEEN HIGH AND LOW SETTINGS)

Single

High-Low Unit

10
25
50

100
150

250

750
1025
1500

(MINIMUM

MIN

Low-Only Pair

High-Only/

3.0

7.5
15
30

45
75
150
225
300

TRIP-TO-RESET ZONE

≤1.5

3.8

7.5
15

23
38
75
113
150