Fishe 846 Electro-Pneumatic Transducer

The FISHER 846 electrical converter receives an electronic input signal and converts it into a pneumatic output signal. The converter includes a patented guide/nozzle design in which two nozzles are placed to keep air flowing continuously through the source nozzle. It has vibration resistance and can be applied to dirty air source.

FISHER846 Electrical converters take an electronic input signal and convert it into a pneumatic output signal. The converter includes a patented guide/nozzle design in which two nozzles are placed to keep air flowing continuously through the source nozzle. It has vibration resistance and can be applied to dirty air source.

The functional characteristics of the United States FISHER846 electric-gas converter:

2.1 Vibration resistance - lightweight pilot stage, mechanically damped guide bar and robust construction provide vibration stability.

2.2 Large diameter nozzles - Large diameter nozzles, free flow pilot design and large internal air ducts reduce the impact of pollutant accumulation and erosion, thus showing in dirty air source applications.

2.3 Improved accuracy and reduced sensitivity to air source pressure changes and downstream leaks - the electronic feedback control network monitors the pneumatic output signal and can detect and correct any input-output deviations. This allows for precision and allows the 2.4 converter to sense changes in the condition of the final element, thereby quickly optimizing the air output.

2.5 Easy maintenance - The main mechanical and electronic components are integrated in a single, field-replaceable "master module". There is no need to remove the converter for troubleshooting or servicing. Vertical field wiring area simplifies installation and maintenance.

2.6 Quick diagnostic checks and remote performance monitoring - Continuous exhaust from the pilot stage exhaust port through the hole in the module cover via the stroke port. If this hole is covered, the output of the converter can be increased, thus ensuring that the pilot and amplifier are working properly and driving the actuator. By providing an optional remote pressure reading, the frequency is directly scaled up to the output pressure and superimposed onto the output signal cable.

2.7 With a 275 HART® communicator or frequency counter, the operator can monitor the output pressure of the Model 846.

Specifications

• Area Classification

• Explosion Proof, Intrinsically Safe, Non-incendive, General Purpose, Flame Proof

• Certifications

• CSA, FM, ATEX, IECEx, CUTR, Regional

• Communication Protocol

• 4-20mA Analog

• Data Interface

• Wired

• Diagnostics

• No

• Input Signal

• Electric

• Max Outlet Pressure

• 35 psig

• Mounting Type

• Remote Mount, Actuator Mount

• Operating Temperature

• Standard Temperature

• Position Control

• Modulating Control

• Power Source

• Local

• Supply Media

• Air

• Other Configurations

• Contact your local Emerson business partner or sales office to learn about additional specifications or options for this product.

The Fisher®646 electrical converter features a patented converter module that converts a 4 to 20 mA input signal to a proportional 0.2 to 1.0 bar (3 to 15 psig) pneumatic output signal. Small size, vibration resistance, high output capacity, low air consumption.

Small size - The converter is small in size and light in weight for easy installation and improved space utilization.

Vibration resistance - When used in applications with standard valves/actuators, the converter is tested in accordance with SAMA standard PMC 31.1 Condition 3 with an output offset of less than 1% of the test range.

High output capability - The output of the converter is sufficient to drive the valve/actuator combination without the need for a positioner or gas flow amplifier.

Low gas consumption - The converter consumes very little gas, which reduces operating costs.

Easy maintenance - The modular design of the converter facilitates field replacement, which reduces maintenance costs.

Excellent performance - accuracy, linearity and hysteresis minimization of frequency response far exceed the requirements of most control systems.