Fisher FS546--4-A 546 Electro-Pneumatic Current-to-Pressure (I/P) Transducer
The Fisher FS546--4-A Electro-Pneumatic Current-to-Pressure Transducer is designed to convert electrical control signals into proportional pneumatic pressure outputs for industrial process control applications.
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- 1 Year Warranty
Product Overview
The Fisher FS546--4-A Electro-Pneumatic Current-to-Pressure Transducer is designed to convert electrical control signals into proportional pneumatic pressure outputs for industrial process control applications. Manufactured by Fisher, an Emerson brand, this transducer receives a 4–20 mA DC input signal and provides a corresponding 0–33 psi (0–2.3 bar) pneumatic output, as specified in the supplied product identification. Its electropneumatic conversion mechanism supports accurate pressure control, responsive pneumatic actuator operation, and reliable integration with industrial control systems. The instrument is suitable for applications requiring an electrical control signal to operate pneumatic equipment, including control valves, actuators, and process instrumentation.
Part of the Fisher Type 546 Series, the FS546--4-A incorporates a torque motor, nozzle-and-flapper mechanism, pneumatic relay, and pressure feedback bellows to provide proportional electrical-to-pneumatic signal conversion. The feedback mechanism helps correct differences between the electrical input command and the pneumatic output, while adjustable zero and span settings allow technicians to calibrate the instrument for its intended operating range. Its aluminium housing and field-reversible operating action support industrial installation and maintenance. The Fisher 546 is used in oil and gas processing, chemical manufacturing, power generation, water treatment, and industrial automation applications requiring dependable analogue current-to-pressure conversion.
Technical Specifications
|
Specification |
Value |
|---|---|
|
Product Name |
Electro-Pneumatic Current-to-Pressure Transducer |
|
Manufacturer / Brand |
Fisher / Emerson |
|
Supplied Model Number |
FS546--4-A |
|
Manufacturer Series |
Type 546 |
|
Product Type |
I/P Transducer |
|
Component Category |
Pneumatic Control Instruments |
|
Operating Technology |
Electropneumatic |
|
Primary Function |
Electrical-to-Pneumatic Signal Conversion |
|
Electrical Input Signal |
4–20 mA DC |
|
Pneumatic Output Range |
0–33 psig (0–2.3 bar) |
|
Signal Conversion |
Proportional Current-to-Pressure |
|
Torque Motor Resistance, 4–20 mA |
176 ±10 Ohms |
|
Control Mechanism |
Torque Motor and Nozzle-Flapper |
|
Pneumatic Amplification |
Integrated Pneumatic Relay |
|
Pressure Feedback |
Pneumatic Feedback Bellows |
|
Operating Action |
Direct or Reverse, Field Reversible |
|
Recommended Supply Pressure |
5 psi Above Maximum Output Pressure |
|
Recommended Supply for 0–33 psi Output |
Approximately 38 psig (2.6 bar) |
|
Maximum Supply Pressure |
50 psig (3.5 bar) |
|
Zero Adjustment |
Manual Screwdriver Adjustment |
|
Span Adjustment |
Manual Screwdriver Adjustment |
|
Supply Air Connection |
1/4 Inch NPT Female |
|
Pneumatic Output Connection |
1/4 Inch NPT Female |
|
Relay Vent Connection |
1/4 Inch NPT Female with Screen |
|
Electrical Connection |
1/2 Inch NPT Female |
|
Housing Material |
Aluminium |
|
Relay Body Material |
Aluminium |
|
Nozzle Material |
Stainless Steel |
|
Feedback Bellows Material |
Brass |
|
Standard O-Ring Material |
Nitrile Rubber |
|
Operating Temperature Range |
−40°C to +66°C |
|
Enclosure Rating |
NEMA 3R |
|
Reference Accuracy, Typical Series Test |
±0.75% of Output Span |
|
Accuracy for Near-Zero Output Ranges |
May Be Approximately ±3.5% of Span |
|
Electrical Classification |
Depends on Actual Certification and Nameplate |
|
Filter Regulator |
Optional |
|
Supply Pressure Gauge |
Optional |
|
Approximate Instrument Weight |
4.1 kg |
|
Working Medium |
Clean, Dry Instrument Air |
|
HART Communication |
Not Supported |
|
Application Scope |
Industrial Pneumatic Control Systems |
|
Condition |
New |
|
Warranty |
1 Year |
Key Features
Electropneumatic current-to-pressure transducer for industrial process automation
Fisher Type 546 design for accurate electrical-to-pneumatic signal conversion
Standard 4–20 mA DC electrical input for analogue control systems
0–33 psi pneumatic output range for compatible industrial control applications
Integrated torque motor for converting electrical signals into mechanical movement
Nozzle-and-flapper mechanism for proportional pneumatic pressure regulation
Pneumatic relay for amplifying the output pressure signal
Feedback bellows for maintaining stable pressure conversion
Adjustable zero and span settings for convenient calibration
Field-reversible direct and reverse operating action
Maximum instrument air supply pressure of 50 psi
Durable aluminium enclosure for industrial instrumentation applications
Standard 1/4-inch NPT pneumatic supply and output connections
Standard 1/2-inch NPT electrical connection
Suitable for integration with compatible pneumatic valve actuators
High-frequency torque motor design helps minimise vibration sensitivity
External pneumatic relay arrangement supports maintenance and replacement
Optional filter regulator arrangement for instrument air conditioning
Suitable for industrial equipment servicing and control system upgrades
Typical Applications
Industrial current-to-pressure signal conversion
Pneumatic control valve actuator systems
Oil and gas production and processing facilities
Chemical and petrochemical manufacturing plants
Petroleum refining and processing installations
Power generation and utility systems
Water and wastewater treatment facilities
Industrial manufacturing and production machinery
Electrical-to-pneumatic process control loops
Industrial flow and pressure regulation systems
Pneumatic diaphragm actuator control
Analogue PLC and distributed control system integration
Control valve instrumentation and servicing
Industrial temperature control systems
Pneumatic automation equipment maintenance
Replacement of compatible Fisher 546 transducers
Shipping & Support
Fast dispatch – Australia & Worldwide Shipping
Technical assistance available
1-year warranty
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