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ELECTRO-PNEUMATIC TRANSDUCER FISHER 546
- PRESSURE CONTROLLER
- TYPE 546
- FISHER
- 4..20mA
In stock
ℹ️ Additional Information
| Condition |
USED/EXCELLENT CONDITION |
|---|---|
| Manufacturer |
EMERSON |
| Product Code |
100.199.04966 |
📦 Guarantee Terms
🗂️ Product Files
🖹 Description
Type 546: Electro-pneumatic signal transducer with explosion-proof case and cover
Input Signals:1 to 5 mA dc, 4 to 20mA dc,10 to 50 mA dc,1 to 9 Vdc, or Twoway split range using either half of one of the standard input signal spans
Output Signals:3 to 15 psig(0.2 to 1.0 bar),6 to 30 psig(0.4 to 2.0 bar),3 to 27 psig(0.2 to 1.9 bar),or 0 to 33 psig (0 to 2.3 bar)
The electro-pneumatic transducer model 546 by Emerson is a classic and widely used industrial control device designed to convert electrical signals into proportional pneumatic pressure. Commonly referred to as an I/P converter (current-to-pressure), this device plays a central role in process control systems where precise modulation of valves and actuators is required.
What It Is
The Model 546 is an electro-pneumatic transducer that receives an electrical input signal—typically 4–20 mA—and converts it into a corresponding air pressure output, usually in the range of 3–15 psi (0.2–1 bar). This proportional relationship allows accurate and continuous control of pneumatic devices.
What It Does
This device acts as a bridge between electronic control systems and pneumatic equipment. It:
- Receives an electrical signal from a PLC or DCS
- Converts it into a proportional pneumatic pressure
- Sends that pressure to control a pneumatic actuator or control valve
This makes it an essential component in automated industrial processes.
Design and Components
The Emerson 546 features a rugged and reliable industrial design:
- Round metal housing: Protects internal components in harsh environments
- Internal electronics with nozzle/flapper system: Ensures precise pressure regulation
- Electrical terminals: For input signal connection
- Air ports: For supply air and regulated output pressure
The nozzle-flapper mechanism is a proven technology that provides stable and accurate control.
How It Works
The operating principle is straightforward:
- A controller sends a 4–20 mA signal
- An internal coil and nozzle/flapper system adjust airflow
- Output pressure changes proportionally
- The pressure signal drives a pneumatic actuator
Example Output
| Input Signal | Output Pressure |
| 4 mA | ~3 psi |
| 12 mA | ~9 psi |
| 20 mA | ~15 psi |
Typical Applications
The Model 546 is widely used in:
- Control valves (such as modulating globe valves)
- Pneumatic actuators
- Process control loops (temperature, flow, pressure)
- Industrial automation systems
Role in a Control Loop
In a typical system:
PLC / DCS → I/P Transducer → Pneumatic actuator → Control valve → Process
Advantages
- Reliable and proven technology
- Accurate signal-to-pressure conversion
- Durable construction for industrial environments
- Easy integration with existing control systems
In Simple Terms
Think of the Emerson 546 as a translator between electricity and air pressure, enabling electronic systems to control pneumatic equipment precisely.
Big Picture
In a complete automation system:
- Sensors and switches → monitor conditions
- Converters and regulators → translate and control signals
- Valves and actuators → execute control actions
This device sits at the heart of the control loop, ensuring smooth and accurate operation of industrial processes.
