Fisher 846 Electro-Pneumatic Transducer
Products Description
The Fisher 846 is an electro-pneumatic transducer that converts a standard 4–20 mA DC signal into a proportional pneumatic output. It is typically installed between an electronic controller and a pneumatic actuator or valve positioner, allowing electrical control systems to operate pneumatic equipment without changing the existing valve setup.
One reason the Fisher 846 has been used in so many process plants is its electronic feedback design. An electronic feedback circuit measures output pressure in real time. When supply pressure drifts or a downstream fitting leaks, the circuit compensates and holds the output on target.

Detailed parameters
|
Item |
Specification |
|
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 |

Key Features
Stable Pneumatic Output
The electronic feedback circuit continuously checks the output pressure and corrects small deviations caused by supply pressure changes or minor air leakage. This helps the actuator receive a more consistent pneumatic signal during operation.
Compatible with Standard Control Systems
The Fisher 846 accepts a standard 4–20 mA input, making it easy to connect with PLCs, DCSs, and other electronic control systems already used in industrial plants.
Handles Demanding Plant Conditions
Industrial environments aren't always clean. The internal pneumatic design helps reduce the effect of contaminated instrument air, while the rugged construction is well suited to continuous operation in process plants.
Faster Maintenance
The replaceable master module allows servicing without rebuilding the entire transducer. If maintenance is needed, the module can be replaced directly, helping reduce repair time and equipment downtime.
Suitable for New or Existing Valve Systems
Whether you're building a new control valve package or replacing an existing I/P transducer, the Fisher 846 can be integrated into a wide range of pneumatic control applications.
Typical Applications
The Fisher 846 is commonly used in systems where an electrical control signal needs to operate pneumatic equipment.
Typical applications include:
- Pneumatic control valves
- Valve positioners
- Pneumatic actuators
- Distributed Control Systems (DCS)
- Process automation systems
- Emergency shutdown systems
Typical industries include:
- Oil & Gas
- Petrochemical
- Chemical Processing
- Power Generation
- Refining
- LNG
- Pulp & Paper
Why Choose Us
We supply genuine Fisher products for customers involved in industrial automation and process control. If you're replacing an existing Fisher 846 or selecting one for a new project, we can help confirm the correct model before shipment.
Our team provides:
Genuine Fisher products
Technical support for model selection
Fast quotation response
Worldwide shipping
Export support for international customers
FAQ
What is the Fisher 846 used for?
The Fisher 846 converts a 4–20 mA electrical signal into a pneumatic output for operating pneumatic actuators, valve positioners, and other air-operated control equipment.
Can the Fisher 846 replace other I/P transducers?
In many applications, yes. The replacement should be selected according to the required input signal, output pressure range, and installation configuration.
Is the Fisher 846 suitable for retrofit projects?
Yes. It is often installed as a replacement for older current-to-pressure transducers without requiring major changes to the existing control valve assembly.
What information is needed before ordering?
Providing the model number, serial number, or application details will help confirm the correct configuration before quotation.
Request a Quote
Need a Fisher 846 Electro-Pneumatic Transducer?
Send us the model number or your application details, and we'll help you confirm the correct configuration, check availability, and provide a quotation.
Hot Tags: fisher 846 electro-pneumatic transducer, China fisher 846 electro-pneumatic transducer manufacturers, suppliers, factory, Compact Pressure Transmitter, Dual Input Temperature Transmitter, Explosion Proof Temperature Transmitter, Food Grade Pressure Transmitter, Low Power Consumption Valve Positioner, Submersible Level Pressure Transmitter
Previous
No InformationYou Might Also Like
Send Inquiry














