Available Configurations

See table 1

Sensing Element Range (Input Signal(1))

See table 2

Process Scale

■ Linear, ■ square root, or ■ others(2) on request

Process Connections

Standard: 1/4 inch NPT female stainless steel (all input ranges)
Optional: 1/2 inch NPT male stainless steel

Output Signal(1)

Proportional or Proportional-Plus-Reset Range: ■ 0.2 to 1.0 bar (3 to 15 psig) or ■ 0.4 to 2.0 bar (6 to 30 psig)
Differential Gap Output: ■ 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 sensed pressure increases output pressure) or ■ reverse (increasing sensed pressure decreases output pressure)

Supply and Output Connections

1/4 inch NPT female

Supply Pressure Requirements(6)

See table 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 4

Controller Adjustments

Proportional Band(1): 5 to 500% of process scale range
Reset(1): Adjustable from 0.01 to more than 74 min per repeat (from 100 to less than 0.0135 repeats per min)
Differential Gap(1) Controllers: Adjustable from 1 to 100% of process scale range
Set Point: Continuously adjustable from 0 to 100% of the scale range.
■Internal Set Point Adjustment (standard): Internal adjustment knob

Controller Performance(3)

Repeatability(1): 0.09% of process scale range
Dead Band(1): Less than 0.2% of process scale range
Typical Frequency Response(1): 1.5 Hz and 90 deg phase shift with 3.05 m (10 feet) of 6.44 mm (1/4 inch) tubing and 1639 cm3 (100 in.3) volume

Steady-State Air Consumption(1,3,4)

0.2 to 1.0 Bar (3 to 15 psig) Output: 0.13 normal m3/hr (5.0 scfh)
0.4 to 2.0 Bar (6 to 30 psig) Output: 0.19 normal m3/hr (7.0 scfh)

Delivery Capacity(3)

0.2 to 1.0 Bar (3 to 15 Psig) Output: 6.4 normal m3/hr (240 scfh)
0.4 to 2.0 Bar (6 to 30 Psig ) Output: 12.9 normal m3/hr (480 scfh)

Exhaust Capacity(3)

0.2 to 1.0 Bar (3 to 15 Psig) Output: 4.6 normal m3/hr (170 scfh)
0.4 to 2.0 Bar (6 to 30 Psig ) Output: 7.0 normal m3/hr (260 scfh)

Operative Ambient Temperature Limits(5,6)

-40 to 70°C (-40 to 160°F)

Hazardous Area Classification

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

Mounting

Controller can be mounted on ■ actuator,
■ panel, ■ wall, or ■ pipestand

Approximate Weight

4.5 kg (10 lb)

• Easy Maintenance—Simple design of the controller allows fast, easy maintenance and minimal spare parts inventory.
• 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.
• Vibration Resistant—Simple design and low mass of internal parts allow the controller to withstand vibration encountered in most plant environments.
• Low Air Consumption—Relay and nozzle design reduces steady-state air consumption to as low as 0.13 normal m3/hr (5 scfh).
• Corrosion Resistant—Tough plastic housing resists corrosive environments. Internal constructions are available to resist a corrosive supply pressure media.
• Mounting Versatility—The controller can mount directly on the actuator (as shown in figure 1) or it can mount on a pipestand, on a wall, or in a panel.
• 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.

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 prevent excessive pressure buildup from occurring inside the case before structural damage can take place.

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 3).

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 differential gap control requires the addition of one piece of tubing.

Anti-Reset Windup

Anti-reset windup is available with proportional-plus-reset controllers. Relief valve may be installed to limit reset windup in either direction.

Remote Set Point

The capability of adjusting the set point from a remote location is available as an option on the 4194 Series controllers.

Auto/Manual Capability

An internal auto/manual station is available for smooth bumpless transfer from automatic to manual and manual to automatic control of the controller output.

Application

1. Description of the service, such as throttling or on-off
2. Pressure range, composition, and temperature of process fluid
3. Ambient temperature

Construction

Refer to the specifications and 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 R to any type number if reverse action is desired.

Note
Neither Emerson ® , Emerson Process Management, Fisher ® , nor any of their affiliated entities assumes responsibility for the selection, use, and maintenance of any product. Responsibility for the selection, use, and maintenance of any product remains with the purchaser and end-user.