550ACT Electro Pneumatic Transducer
The 550ACT electro pneumatic transducer is an electronic pressure regulator that converts an electrical input signal into a...
What This Model Does
The 550ACT electro pneumatic transducer is an electronic pressure regulator that converts an electrical input signal into a proportional pneumatic output pressure. It uses electromagnetic conversion to translate electrical variations into physical displacement of a solid thin metal disk baffle inside a nozzle baffle mechanism. Built as a form fit and function replacement for ControlAir type 550 series transducers, it converts standard DC 4 to 20 mA signals into a 20 to 100 kPa pneumatic signal for process control equipment.
| Model | 550ACT |
|---|---|
| Type | Electro pneumatic transducer (I/P, E/P converter) |
| Input signal | DC 4 to 20 mA (variable current or voltage) |
| Output pressure | 20 to 100 kPa |
| Actuator spring compatibility | 20 to 100 kPa |
| Operating mechanism | Nozzle baffle with permanent magnet cylinder and coil disk |
| Housing colour | Black, blue, yellow or painted to customer requirement |
| Warranty | 18 months |
Why Buyers Specify This Model
- Converts DC 4 to 20 mA controller signals directly into a proportional 20 to 100 kPa pneumatic pressure
- Uses a nozzle baffle mechanism driven by an electromagnetic coil for reliable proportional pressure regulation
- Serves as a direct replacement for ControlAir type 550 series transducers without piping redesign
- Matches standard 20 to 100 kPa pneumatic control valve spring ranges for full stroke operation
- Supplied with standard lead times of 2 to 3 days for regular orders to keep plant maintenance moving
Problems It Solves
- Control room electrical signals cannot directly operate pneumatic valve actuators without an interface
- Long factory lead times from original transducer brands keep process lines waiting during maintenance
- Actuator fails to stroke fully when driven by mismatched pressure ranges outside 20 to 100 kPa
- Discontinued original converters require expensive re-piping or bracket redesign on existing skids
Application Scenarios
- Pneumatic control valves with a 20 to 100 kPa actuator spring range operating from a DCS output
- Replacing worn or discontinued ControlAir type 550 series transducers on process skids
- Converting 4 to 20 mA current loops to pneumatic pilot pressure for industrial automation circuits
- OEM valve packages requiring an integrated electro pneumatic converter under customer private branding
Who It Is For
- Plant instrument technicians replacing failed transducers on 20 to 100 kPa pneumatic actuators
- Pneumatic valve assemblers fitting I/P and E/P converters before shipment
- Process instrumentation distributors stocking replacements for ControlAir pattern units
- EPC contractors purchasing field instruments for process plant upgrade packages
- Trading companies sourcing form fit and function electro pneumatic converters
Technical Features
- Electromagnetic conversion driving physical displacement of an internal baffle mechanism
- Nozzle baffle system utilising a solid thin metal disk baffle in the middle
- Coil structure designed with a thin convex outside and hollow inside passing through a permanent magnet
- Converts standard DC 4 to 20 mA input into a 20 to 100 kPa proportional pneumatic output
- Single-stage proportional electronic pressure regulation designed for 20 to 100 kPa spring ranges
Materials and Construction
- Solid thin metal disk baffle component
- Thin metal electromagnetic coil structure
- Permanent magnet cylinder assembly
- Metal protective housing painted to specification
Dimensions and Connection Detail
Reference image published with this model on the original catalogue. Confirm critical dimensions against the datasheet before machining a bracket.
Manufacturing and Quality Control
Every unit is calibrated and stroke tested before it is packed. We can film or photograph your units in the sample room or warehouse before they ship.
Manufacturing Steps
Machining and preparation of transducer housing components
Winding and mounting of the hollow thin metal coil structure
Installation of the permanent magnet cylinder and metal disk baffle assembly
Pneumatic nozzle alignment and mechanical calibration for 20 to 100 kPa output
Electrical input sweep testing across the 4 to 20 mA control range
Custom painting and nameplate marking for OEM customer requirements
Protective packaging in standard or customised cartons
Quality Control
- Every converter undergoes pneumatic output pressure verification across the input signal span
- Visual and functional check of the nozzle baffle assembly prior to packaging
- Sample room or warehouse photos and video available to the buyer before dispatch
- Faulty units inside the 18 month warranty replaced on photo or video evidence without return
Customisation Options
- Customer logo and model marking on the unit nameplate
- Housing painted in custom colours including black, blue, yellow and other specified tones
- Packaging customisation including custom carton labelling
- Newly designed shape modules developed to customer drawings for OEM integration
How It Compares With the Alternatives
| Valve positioner with mechanical stem feedback | The 550ACT regulates air pressure directly to 20 to 100 kPa without reading physical stem travel, requiring matching actuator springs |
|---|---|
| Pneumatic regulator without electrical input | The 550ACT accepts automated 4 to 20 mA signals from a PLC or DCS rather than manual pressure adjustment knobs |
Fitting and Setting Up This Model
General field procedure. Always follow the datasheet for the exact calibration sequence and any hazardous area requirements.
Verify the connected control valve actuator spring compression coefficient matches 20 to 100 kPa
Mount the transducer securely in the pneumatic instrumentation circuit or valve yoke
Connect clean instrument air supply within operating specifications to the input port
Connect the pneumatic output port to the actuator diaphragm chamber or cylinder
Wire the 4 to 20 mA DC control loop observing terminal polarity
Verify output pressure reaches 20 kPa at 4 mA input and 100 kPa at 20 mA input
Check that the valve achieves complete open and close travel across the pressure span
550ACT Electro Pneumatic Transducer FAQ
What is the typical lead time for this transducer?
Regular order quantities normally ship in 2 to 3 days from stock. Large orders ship within 7 to 10 days.
Can this unit drive any control valve actuator directly?
The connected pneumatic control valve actuator must have a spring compression coefficient of 20 to 100 kPa. If the actuator uses a different spring range, full open and full close travel cannot be achieved without a positioner.
How does the conversion mechanism work inside?
An electrical signal moves a hollow metal coil within a permanent magnet cylinder. This coil moves a solid metal disk baffle against an air nozzle to regulate output pressure.
Can you supply this transducer with our company branding?
Yes. We offer OEM customisation including customer logo marking on nameplates, custom carton packaging, and housing painting in black, blue, yellow, or other colours.
What warranty covers this electro pneumatic converter?
We provide an 18 month warranty. If a unit fails, send photo or video evidence and we provide a replacement rather than repairing the old unit.
Can I see photos of the actual order before shipment?
Yes. Our team can take real photos or videos of your units in our sample room or warehouse prior to dispatch.
Applications Cases and Guides
Related Case Photos
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Get A Price on This Model
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