PT700 Electro Pneumatic Transducer
The PT700 electro pneumatic transducer converts a 4 to 20 mA electrical signal into a proportional 0 to 100% pneumatic...
What This Model Does
The PT700 electro pneumatic transducer converts a 4 to 20 mA electrical signal into a proportional 0 to 100% pneumatic output pressure. It serves as the interface between a control system and a pneumatic actuator in industrial process applications such as chemical, petrochemical, and refinery plants. The device is a form fit and function replacement for the Flowserve PT700 series transducer already installed on existing systems. It operates on a two-wire circuit, drawing power from the input signal, and uses piezoelectric microvalves for low power consumption and compact design.
| Model | PT700 |
|---|---|
| Type | Electro pneumatic transducer |
| Input signal | DC 4 to 20 mA, split range available at 4 mA or 12 mA |
| Output signal | Pneumatic 0 to 100% of supply pressure |
| Power supply | Two-wire system, powered by input signal |
| Control loop | Internal PI control with feedback from silicon pressure sensor |
| Valve technology | Piezoelectric microvalve |
| Mounting | Universal NAMUR mounting kit in stainless steel |
| Warranty | 18 months |
Why Buyers Specify This Model
- Converts 4 to 20 mA electrical signal directly to proportional pneumatic output pressure
- Operates on a two-wire system; no separate power supply required
- Uses piezoelectric microvalves for low power consumption and high reliability
- Provides precise control with high dynamic response due to internal PI control loop
- Maintains stable output despite variations in supply air pressure
- Robust modular design allows easy maintenance and field servicing
- Resists shock and vibration, suitable for harsh industrial environments
Problems It Solves
- Original Flowserve PT700 transducer is on long lead time or no longer available
- Existing transducer draws too much power, requiring a separate power supply
- Control loop response is slow due to outdated analog control algorithm
- Pneumatic output drifts with changes in supply air pressure
- Transducer fails in high vibration environments due to mechanical wear
- Need to replace a transducer without changing the actuator or mounting configuration
Application Scenarios
- Replacing a failed Flowserve PT700 transducer on a pneumatic actuator in a refinery control loop
- Upgrading a control system where the existing transducer has poor dynamic response
- Installing a transducer in a new skid-mounted unit where space is limited
- Rebuilding a control loop where the original transducer is discontinued
- Integrating a transducer into a system using a 4 to 20 mA signal without adding external power
Who It Is For
- Plant instrument technicians replacing worn or failed transducers on pneumatic actuators
- EPC contractors procuring transducers in bulk for plant construction projects
- Valve and actuator OEMs needing transducers under their own brand
- Distributors stocking spares for Flowserve PT700 series users
- Maintenance teams needing a direct replacement without reconfiguring the control system
Technical Features
- Two-wire system powered by the 4 to 20 mA input signal
- Input signal range: 4 to 20 mA, split range start at 4 mA or 12 mA
- Output pressure range: 0 to 100% of supply pressure
- Uses silicon pressure sensor for feedback in the control loop
- Piezoelectric microvalve-based electro-pneumatic converter
- Internal PI control loop for improved dynamic response
- Universal NAMUR mounting kit in stainless steel
- Modular design for easy field maintenance
- Infinite resolution valve position sensor for accurate feedback
Materials and Construction
- Die-cast aluminium housing with corrosion-resistant finish
- Stainless steel mounting kit and internal structural components
- Silicon pressure sensor and piezoelectric microvalve assembly
- Full material and finish breakdown is provided in the datasheet PDF
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
Housing die-casting and machining
Assembly of piezoelectric microvalve and pneumatic amplifier
Integration of silicon pressure sensor and feedback circuit
Calibration of input-output response on air bench
Two-wire signal and power test across 4 to 20 mA range
Final inspection and packaging in standard or custom cartons
Quality Control
- Every unit is tested for signal-to-pressure accuracy and response time
- Photos or video of actual units can be provided on request via WhatsApp
- Faulty units within the 18 month warranty are replaced, not repaired
- Replacements are shipped with the next order or separately if urgent
- All units pass a vibration and shock test before packing
Customisation Options
- Customer logo and nameplate marking
- Housing painted in black, blue, yellow or other colours to order
- Custom carton and inner packaging for OEM or project orders
- Supplied with or without limit switch box or position transmitter module
- Newly designed shape modules developed to customer drawings
How It Compares With the Alternatives
| Traditional pneumatic transducer with solenoid valve | The PT700 uses piezoelectric microvalves, which consume less power and are more responsive than solenoid valves |
|---|---|
| Transducer with separate power supply | The PT700 operates on a two-wire system; no external power source is needed |
| Intelligent digital transducer with HART | The PT700 is an analog device; it offers simpler integration without digital protocol overhead |
| Flowserve PT700 original | This is a form fit and function replacement; it matches the original in dimensions, mounting, and signal handling |
Fitting and Setting Up This Model
General field procedure. Always follow the datasheet for the exact calibration sequence and any hazardous area requirements.
Mount the transducer using the NAMUR stainless steel mounting kit
Connect clean, dry instrument air to the supply port and the actuator to the output port
Wire the 4 to 20 mA signal to the two-wire terminals, observing polarity
Set the split range start point to 4 mA or 12 mA as required by the control system
Verify the output pressure response across the full 4 to 20 mA range
Check the air filter regulator regularly; dirty air causes drift and reduced lifespan
If replacing an existing unit, match the mounting orientation and cable routing
PT700 Electro Pneumatic Transducer FAQ
Will this fit the bracket already on my actuator?
Yes, if the existing transducer uses a NAMUR mounting pattern. Send a photo of the current mounting setup via WhatsApp and we will confirm before you order.
What is the lead time?
Regular quantities ship in 2 to 3 days. Large project orders take 7 to 10 days.
Can I get it in our own colour with our logo?
Yes. The housing can be painted in black, blue, yellow or any other colour to your specification. Your logo is printed on the nameplate.
What is the difference between this and the original Flowserve PT700?
This is a form fit and function replacement. It matches the original in dimensions, mounting, signal input, and output performance.
What happens if a unit fails on site?
The 18 month warranty covers replacement. Send a photo or video of the failure, and we will ship a new unit—usually with your next order or immediately if needed.
Can I see the actual units before they ship?
Yes. Request a photo or video of the actual units from our sample room or warehouse via WhatsApp before shipment.
Does it need a separate power supply?
No. It operates on a two-wire system powered directly by the 4 to 20 mA signal.
Applications Cases and Guides
Get A Price on This Model
Tell us the quantity, the actuator it goes on and the destination port. We come back with price, lead time and confirmation that the model matches your valve.