Instruction Manual
D200158X012
4194S Controllers
July 2018
3
Table 1-1. Specifications
Available Configurations
Sensing Element Range (Input Signal)
Lower and Upper Range Limits:
Maximum Allowable Pressure:
Process Scale
Matched to the range of the process differential
pressure as standard. Optional scales available
Process Connections
Standard:
1/4 NPT internal stainless steel (all input
ranges)
Optional:
1/2 NPT internal stainless steel
Output Signal
Differential Gap Range:
0 and 1.4 bar (0 and 20 psig)
or 0 and 2.4 bar (0 and 35 psig)
Action:
Field‐reversible between direct (increasing
differential pressure increases output pressure) or
reverse (increasing differential pressure decreases
output pressure).
Supply and Output Connections
1/4 NPT internal
Supply Pressure Requirements
Supply Pressure Medium
Air or Natural Gas
Supply medium must be clean, dry and non-corrosive
Per ISA Standard 7.0.01
A maximum 40 micrometer particle size in the air
system is acceptable. Further filtration down to 5
micrometer particle size is recommended. Lubricant
content is not to exceed 1 ppm weight (w/w) or
volume (v/v) basis. Condensation in the air supply
should be minimized.
Per ISO 8573-1
Maximum particle density size:
Class 7
Oil content:
Class 3
Pressure Dew Point:
Class 3 or at least 10°C less than
the lowest ambient temperature expected
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)
Controller Adjustments
Differential Gap Control:
5 to 100% of process scale
range
Set Point:
Continuously adjustable from 0 to 100% of
the scale range
Steady‐State Air Consumption
0 to 1.4 Bar (0 to 20 Psig) Output:
0.08 m
3
/hr (2.8 scfh)
0 to 2.4 Bar (0 to 35 Psig) Output:
0.07 m
3
/hr (2.5 scfh)
Operative Ambient Temperature Limits
-40 to 70
_
C (-40 to 160
_
F)
Housing
Designed to NEMA 3 (weatherproof) and IEC 529 IP54
specifications
Hazardous Area Classification
4194S differential pressure indicating controllers
comply with the requirements of ATEX Group II
Category 2 Gas and Dust
Mounting
Controller can be mounted on actuator, panel, wall,
or pipestand.
Approximate Weight
4.5 kg (10 pounds)
Declaration of SEP
Fisher Controls International LLC declares this
product to be in compliance with Article 4 paragraph
3 of the PED Directive 2014/68/EU. It was designed
and manufactured in accordance with Sound
Engineering Practice (SEP) and cannot bear the CE
marking related to PED compliance.
However, the product
may
bear the CE marking to
indicate compliance with
other
applicable European
Community Directives.
NOTE: Specialized instrument terms are defined in ANSI/ISA Standard 51.1 - Process Instrument Terminology.
1. Consult your Emerson sales office or Local Business Partner for additional information.
2. Normal m3/hour - 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
3. Also for transportation and storage limits.
