TA7800 Electro Pneumatic Transducer
The TA7800 electro pneumatic transducer converts a DC input signal into a linear proportional pneumatic output pressure.
What This Model Does
The TA7800 electro pneumatic transducer converts a DC input signal into a linear proportional pneumatic output pressure. It uses a solid state controlled piezoelectric ceramic actuator that functions as a flapper against a nozzle in the primary converting section. An internal electronic feedback circuit monitors and maintains precise output pressure regardless of line vibration or mounting position. Built with a pneumatic relay section incorporating upper and lower control diaphragms, it serves as a form fit and function replacement for Fairchild T7800 series transducers across industrial instrumentation and process control loops. The housing carries NEMA 4X, Type 4 and IP65 ratings for indoor and outdoor installations.
| Model | TA7800 (T7800 Series) |
|---|---|
| Type | Electro pneumatic I/P and E/P transducer |
| Input signal | DC input signal, split range capable |
| Output action | Linear proportional pneumatic output, field reversible |
| Primary actuator | Solid state controlled piezoelectric ceramic actuator |
| Feedback | Internal electronic feedback |
| Enclosure rating | NEMA 4X, Type 4, IP65 |
| Certifications | Canadian Registration Numbers (CRN) for all territories and provinces |
| Warranty | 18 months |
Why Buyers Specify This Model
- Piezoelectric ceramic actuator provides solid state control with no moving coils or torque motors
- Internal electronic feedback maintains exact output pressure regardless of field vibration or unit position
- Field reversible operation allows direct or inversely proportional pneumatic output from the DC input
- Built in RFI and EMI protection eliminates susceptibility to radio and electromagnetic interference
- Damping adjustment allows fine tuning of loop response to eliminate instability or overshoot
- Split range capability enables one common DC signal source to control two or more downstream functions
- Compact enclosure fits easily into restricted control panels, skid assemblies and crowded valve yokes
Problems It Solves
- Output pressure drifting when process lines vibrate or when transducers are mounted off horizontal
- Radio frequency or electromagnetic interference causing output spikes in plants with high power equipment
- Control loop instability caused by sluggish or overly sensitive pneumatic relay response
- Inability to reverse output action in the field without purchasing a dedicated reverse acting model
- Space constraints preventing standard sized electro pneumatic transducers from fitting inside enclosures
- Original brand transducer lead times causing delays during routine maintenance or project turnarounds
Application Scenarios
- Converting DCS or PLC analog outputs to pneumatic drive pressure on vibrating process piping skids
- Replacing discontinued or high lead time Fairchild T7800 series transducers in plant loops
- Mounting inside restricted instrument cabinets where standard body transducers cannot clear panel doors
- Outdoor valve automation requiring NEMA 4X, Type 4 enclosure and IP65 ingress protection
- Split range pneumatic operations where two separate control elements sequence off a single DC loop
- Control loops exposed to radio interference or strong electromagnetic fields from nearby drives and switchgear
Who It Is For
- Plant instrument technicians replacing worn or drifting Fairchild pattern transducers on running units
- Control valve and skid OEMs needing compact I/P and E/P conversion modules under their own branding
- EPC contractors sourcing process instrumentation packages for plant automation and expansion projects
- Instrumentation distributors maintaining stock of form fit and function transducer replacements
- Automation panel builders requiring vibration resistant electro pneumatic converters with IP65 protection
Technical Features
- Piezoelectric ceramic actuator functioning as a flapper in the primary converting section
- Pneumatic relay section with upper control diaphragm and lower output sensing diaphragm
- Internal electronic feedback loop for continuous correction of output pressure
- Field reversible output providing inversely proportional pressure to the input signal
- Built in RFI and EMI protection against industrial electrical interference
- Damping adjustment feature for tuning dynamic response to match the process loop
- Compact design with versatile mounting configurations for installation flexibility
Materials and Construction
- Die cast housing rated to NEMA 4X, Type 4 and IP65
- Piezoelectric ceramic flapper actuator element
- Elastomeric upper and lower control diaphragms inside pneumatic relay
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 finishing of transducer body components
Assembly of solid state electronic circuit boards with RFI and EMI shielding
Integration of piezoelectric ceramic actuator and precision nozzle assembly
Assembly of upper and lower control diaphragms within the pneumatic relay block
Bench calibration across input signal span and zero set points
Damping adjustment and field reversal functional verification
Enclosure painting in black, blue, yellow or custom OEM colours
Final packing in standard or customer specified packaging
Quality Control
- Every unit undergoes pneumatic calibration and signal response verification before dispatch
- Real product photos and video clips can be recorded in the warehouse before packing
- Faulty units within the 18 month warranty are replaced on photo or video evidence without requiring repair
- Urgent replacement units are dispatched in the fastest way if a plant is down or order goods are missed
Customisation Options
- Customer logo marking and custom nameplate details
- Housing painted in specified colours including black, blue, yellow or custom paint codes
- Custom packaging and carton marking to match distributor or OEM requirements
- Newly designed shape modules developed to buyer technical specifications
How It Compares With the Alternatives
| Conventional torque motor I/P transducer | The TA7800 uses a solid state piezoelectric ceramic actuator and internal feedback that resist vibration better than coil assemblies |
|---|---|
| Standard direct acting transducer | The TA7800 features field reversible output so inverse proportional operation can be set without replacing the unit |
| Unshielded electro pneumatic converter | The TA7800 incorporates RFI and EMI protection to eliminate measurement drift near motors, radios and switchgear |
| Full digital valve positioner | A positioner provides stem feedback on an actuator whereas the TA7800 converts DC signals to proportional pressure for open loop or remote drive |
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 in any orientation using available mounting configurations to fit your space
Connect clean, dry instrument supply air to the supply port and tube the output to the receiver device
Wire the DC input signal to the terminal block observing correct polarity
Set direct or reverse acting operation using the field reversible adjustment feature as required
Tune the damping adjustment screw to stabilize output response if the downstream loop exhibits oscillation
For split range control, calibrate the zero and span settings to the corresponding portion of the input signal
Ensure the housing cover is tightened fully to maintain NEMA 4X and IP65 weather tightness
TA7800 Electro Pneumatic Transducer FAQ
Can this replace my existing Fairchild T7800 transducer directly?
Yes. The TA7800 provides form fit and function replacement for Fairchild T7800 series transducers, sharing identical operating principles and compact enclosure sizing.
What is the lead time for regular and bulk quantities?
Regular quantities typically ship within 2 to 3 days from stock. Large orders or custom batches require 7 to 10 days.
Does vibration affect the pneumatic output pressure?
No. The solid state piezoelectric actuator and internal electronic feedback continuously maintain accurate output pressure regardless of line vibration or mounting position.
Can the transducer be set for reverse action on site?
Yes. The unit features a field reversible setting that provides an output inversely proportional to the DC input signal without needing extra parts.
What enclosure protection does the housing have for outdoor use?
The housing is rated NEMA 4X, Type 4 and IP65, making it suitable for both indoor control rooms and harsh outdoor process environments.
What is the warranty and how are defective units handled?
We provide an 18 month warranty. If a unit fails, send photo or video evidence and we replace it directly rather than asking for it to be repaired.
Can we order these transducers with our own branding and paint colour?
Yes. We provide OEM service including customer logo nameplates, custom cartons, and housing painting in black, blue, yellow, or other customer colours.
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