Emerson Fisher 4194 Data Sheet

Product Bulletin

4194 Differential Pressure Controllers

D200048X012

34.4:4194
May 2013

Fisherr 4194 Differential Pressure Indicating
Controllers

Fisher 4194 (low pressure) differential pressure
indicating controllers show process differential
pressure and set point on an easy‐to‐read process
scale. The controllers sense two different pressures
and compare the difference between these pressures
with an operator‐adjusted set point. A pneumatic
signal is then delivered to a control element to change
the process differential pressure toward the set point.
The controllers use a capsular element for differential

pressure up to 2.0 bar (30 psi). They are available for
proportional only, proportional‐plus‐reset, and
differential gap control. The controller is also available
(see table 1) with anti‐reset windup, internal
auto/manual station, and remote set point
adjustability (see table 1). 4194 controllers are used in
industry where process monitoring and accurate
measurement of differential pressures are required.

PROCESS

SET POINT
ADJUSTMENT

PRESSURE
INDICATOR

W5850‐1

CONTROLLER YOKE‐MOUNTED ON

ACTUATOR OF CONTROL VALVE

www.Fisher.com

W5827‐2

SUPPLY
PRESSURE
GAUGE

INTERIOR OF CONTROLLER

OUTPUT
PRESSURE
GAUGE

Product Bulletin

34.4:4194
May 2013

Specifications

4194 Differential Pressure Controllers

D200048X012

Available Configurations

See table 1

Sensing Element Range (Input Signal)

See table 2

Process Scale

J Linear, J square root, or J others on request

(1)

Process Connections

Standard: 1/4 NPT internal stainless steel (all input
ranges)
Optional: 1/2 NPT external stainless steel

Output Signal

Proportional or Proportional‐Plus‐Reset Range:

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

(6 to 30 psig)
Differential Gap Output:

(0 and 20 psig) or
Action: Field‐reversible between

sensed pressure increases output pressure) or

J 0 and 1.4 bar

J 0 and 2.4 bar (0 and 35 psig)

J direct (increasing

J

reverse (increasing sensed pressure decreases output
pressure)

Supply and Output Connections

1/4 NPT internal

Supply Pressure Requirements

(2)

See table 3

Supply Pressure Medium

Air or natural gas

(3)

Remote Set Point Pressures

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

(6 to 30 psig)

Differential Gap Controllers: Adjustable from 1 to
100% of process scale range

Set Point: Continuously adjustable from 0 to 100% of
the scale range.

J Internal Set Point Adjustment (standard): Internal

adjustment knob

Controller Performance

(4)

Repeatability: 0.09% of process scale range
Dead Band: Less than 0.2% of process scale range
Typical Frequency Response: 1.5 Hz and 90 deg phase

shift with 3.05 m (10 feet) of 6.44 mm (1/4 inch)
tubing and 1639 cm

Steady‐State Air Consumption

3

(100 in.3) volume

(4)(5)

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

3

0.09 m

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

0.13 m

Delivery Capacity

/hr (3.5 scfh)

3

/hr (5.0 scfh)

(4)

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

3

/hr (240 scfh)

6.4 m

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

3

9.4 m

/hr (350 scfh)

Exhaust Capacity

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

3

5.0 m

/hr (186 scfh)

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

3

7.9 m

/hr (295 scfh)

Operative Ambient Temperature Limits

(4)

(2)(6)

–40 to 70_C (–40 to 160_F)

Hazardous Area Classification

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

Construction Materials

See table 4

Mounting

Controller can be mounted on

Controller Adjustments

Proportional Band: 5 to 500% of process scale range
Reset: Adjustable from 0.01 to more than 74 min per

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

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. Natural gas should contain no more than 20 ppm of H

4. Normal m

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

6. Also for transportation and storage limits.

2

3

/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).

S.

2

3

/hr (10.0 scfh).

J panel, J wall, or J pipestand

Approximate Weight

4.5 kg (10 lb)

J actuator,

4194 Differential Pressure Controllers

D200048X012

Table 1. Available Configurations

TYPE

NUMBER

4194A

4194AE

4194AM

4194AME

4194B
4194BE
4194BF

4194BFE

4194BM
4194BME
4194BFM

4194BFME

4194C
4194CE
4194CF

4194CFE

4194CM
4194CME
4194CFM

4194CFME

4194S

4194SE
4914HSM
4194SME

1. Reverse‐acting constructions are designated by an R added to the type number.

2. Consult your Emerson Process Management sales office for information on rate.

(1)

Proportional‐

Only

X
X
X
X

‐ ‐ ‐
‐ ‐ ‐
‐ ‐ ‐
‐ ‐ ‐
‐ ‐ ‐
‐ ‐ ‐
‐ ‐ ‐
‐ ‐ ‐

‐ ‐ ‐
‐ ‐ ‐
‐ ‐ ‐
‐ ‐ ‐
‐ ‐ ‐
‐ ‐ ‐
‐ ‐ ‐
‐ ‐ ‐

‐ ‐ ‐
‐ ‐ ‐
‐ ‐ ‐
‐ ‐ ‐

Proportional‐

Plus Reset

‐ ‐ ‐
‐ ‐ ‐
‐ ‐ ‐
‐ ‐ ‐

X
X
X
X
X
X
X
X

‐ ‐ ‐
‐ ‐ ‐
‐ ‐ ‐
‐ ‐ ‐
‐ ‐ ‐
‐ ‐ ‐
‐ ‐ ‐
‐ ‐ ‐

‐ ‐ ‐
‐ ‐ ‐
‐ ‐ ‐
‐ ‐ ‐

Proportional‐Plus
Reset‐Plus‐Rate

‐ ‐ ‐
‐ ‐ ‐
‐ ‐ ‐
‐ ‐ ‐

‐ ‐ ‐
‐ ‐ ‐
‐ ‐ ‐
‐ ‐ ‐
‐ ‐ ‐
‐ ‐ ‐
‐ ‐ ‐
‐ ‐ ‐

‐ ‐ ‐
‐ ‐ ‐
‐ ‐ ‐
‐ ‐ ‐

Product Bulletin

34.4:4194
May 2013

CONFIGURATIONS

Differential

(2)

X
X
X
X
X
X
X
X

Gap

‐ ‐ ‐
‐ ‐ ‐
‐ ‐ ‐
‐ ‐ ‐

‐ ‐ ‐
‐ ‐ ‐
‐ ‐ ‐
‐ ‐ ‐
‐ ‐ ‐
‐ ‐ ‐
‐ ‐ ‐
‐ ‐ ‐

‐ ‐ ‐
‐ ‐ ‐
‐ ‐ ‐
‐ ‐ ‐
‐ ‐ ‐
‐ ‐ ‐
‐ ‐ ‐
‐ ‐ ‐

X
X
X
X

Anti‐Reset

Windup

‐ ‐ ‐
‐ ‐ ‐
‐ ‐ ‐
‐ ‐ ‐

‐ ‐ ‐
‐ ‐ ‐

X

X
‐ ‐ ‐
‐ ‐ ‐

X

X
‐ ‐ ‐

‐ ‐ ‐

X

X
‐ ‐ ‐
‐ ‐ ‐

X

X
‐ ‐ ‐

‐ ‐ ‐
‐ ‐ ‐
‐ ‐ ‐

Remote Set

Point

‐ ‐ ‐
‐ ‐ ‐

X
X

‐ ‐ ‐
‐ ‐ ‐
‐ ‐ ‐
‐ ‐ ‐

X
X
X
X

‐ ‐ ‐
‐ ‐ ‐
‐ ‐ ‐
‐ ‐ ‐

X
X
X
X

‐ ‐ ‐
‐ ‐ ‐

X
X

Internal Auto/

Manual Station

‐ ‐ ‐

X

‐ ‐ ‐

X

‐ ‐ ‐

X

‐ ‐ ‐

X

‐ ‐ ‐

X

‐ ‐ ‐

X

‐ ‐ ‐

X

‐ ‐ ‐

X

‐ ‐ ‐

X

‐ ‐ ‐

X

‐ ‐ ‐

X

‐ ‐ ‐

X

Features

n Easy Maintenance—Simple design of the controller

allows fast, easy maintenance and minimal spare
parts inventory.

n Easy Adjustment—Adjusting the set point and the

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

n Vibration Resistant—Simple design and low mass of

internal parts allow the controller to withstand
vibration encountered in most plant environments.

n Low Air Consumption—Relay and nozzle design

reduces steady‐state air consumption to as low as

0.09 m

n Corrosion Resistant—Tough plastic housing resists

3

/hr (3.5 scfh).

corrosive environments. Internal constructions are
available to resist a corrosive supply pressure
media.

n Mounting Versatility—The controller can mount

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

n Highly Visible Display—Two red pointers on a

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

3