Setra 264 Low Differential Pressure Transducer
Overview
Setra 264 is the industry-standard very low differential pressure transducer, with millions of units installed worldwide across building automation, cleanroom, and healthcare facilities. The Setra 264 uses a dead-ended, micro-TIG welded all-stainless-steel capacitive sensing element that needs minimal signal amplification, giving it exceptional long-term stability compared to strain-gauge and piezoresistive alternatives at the very low pressure ranges — as low as 0.1 in. W.C. full scale — where room pressurization and fume hood control operate. Over two decades of field deployment have made the 264 the trusted reference sensor for facility engineers who cannot afford drift once a cleanroom or isolation room is commissioned.
As the official authorized partner and exclusive regional representative for Setra Systems, Seven Star LLC proudly supplies the Setra 264 transducer to hospitals, pharmaceutical plants, semiconductor fabs, and commercial HVAC contractors across Oman and the GCC. Facility teams in Muscat and across the Sultanate specify the 264 because it ships with genuine Setra factory calibration and a documented 3-year unconditional warranty, both of which matter when a health authority or accreditation body audits room pressure logs.
Measurement Principle
The Setra 264 senses differential or gauge (static) pressure and converts the pressure difference into a proportional 0 to 5 VDC or 4 to 20 mA electrical output, supporting both unidirectional and bidirectional pressure ranges. The core sensing element is a dead-ended, welded stainless steel diaphragm forming one plate of a variable capacitor; as differential pressure deflects the diaphragm, the capacitance changes in a predictable, repeatable relationship that Setra’s electronics linearize into an analog output. Because the sensing element itself is stainless steel and welded rather than bonded, there is no adhesive or bonding layer to creep or fatigue over years of service, which is the primary reason the 264 achieves 0.5% FS/year long-term stability.
In practice this translates to zero moving parts exposed to the process air, no diaphragm rupture risk from routine overpressure up to 10 PSI (range dependent), and a sensor that continues reading accurately without periodic re-zeroing. For a VAV box, an isolation room, or a fume hood control loop, that stability is what keeps the space in specification between scheduled calibration cycles rather than drifting silently out of compliance.
Engineering Design of the Setra 264
Physically, the Setra 264 ships in a fire-retardant, glass-filled polyester case rated UL 94 V-0, with a removable zinc-plated steel mounting base built around a 2.75 inch snap track for fast, tool-light installation. Two 3/16 inch O.D. barbed brass pressure fittings accept 1/4 inch push-on tubing, and the zero and span trim potentiometers are accessible from the top of the case without removing the cover, so a technician can field-adjust the sensor without breaking the pressure connections.
Electrical termination is available as a screw terminal strip (T1) or an optional 1/2 inch conduit enclosure (A1) for installations that require conduit-run wiring per local electrical code. The 3-wire voltage version (common, output, excitation) accepts 9 to 30 VDC unregulated supply thanks to internal regulation, while the 2-wire 4 to 20 mA current-loop version simplifies wiring in longer cable runs. Reverse wiring protection is built in, reducing commissioning callbacks when contractors wire dozens of these units across a multi-zone facility.
Key Features
The Setra 264 combines proven sensing technology with a rugged, field-serviceable package built for high-volume BAS deployment:
- Dead-ended, all-stainless-steel welded capacitive sensing element delivers long-term stability without adhesive bond-line creep.
- Standard accuracy of ±1.0% FS, with optional ±0.4% FS and ±0.25% FS versions for critical applications.
- Pressure ranges from 0.1 in. W.C. to 100 in. W.C. full scale cover both cleanroom and general HVAC duties.
- Selectable 0 to 5 VDC or 4 to 20 mA analog output for direct wiring into BMS, DDC, or SCADA controllers.
- Up to 10 PSI overpressure rating, range dependent, protects against accidental line surges during commissioning.
- Snap-track mounting base and top-accessible zero/span trims minimize installation and calibration labor.
- Fire-retardant UL 94 V-0 case and reverse-wiring protection support safe, low-maintenance long-term operation.
- Backed by a 3-year unconditional factory warranty, extending well past typical BAS contractor warranty terms.
Industrial Applications
The Setra 264 is deployed wherever precise, low-range differential pressure control protects a process or an occupied space. In hospitals and healthcare facilities it maintains negative pressure in isolation rooms and positive pressure in operating theaters and clean corridors; in pharmaceutical and semiconductor manufacturing it holds cleanroom pressure cascades within GMP or ISO cleanliness limits. VAV boxes, fan control loops, and energy management systems use the 264 to modulate airflow and reduce fan energy consumption, while laboratories rely on it for fume hood face velocity and containment verification.
As the officially authorized partner for Setra Systems, Seven Star LLC distributes the Setra 264 to district cooling operators, hospital groups, and industrial facilities across Oman and the wider GCC, including projects in the Sohar and Salalah economic zones where reliable, factory-calibrated pressure sensing is essential for both process control and regulatory compliance. Regional stock and local technical support mean facility teams are not waiting on international freight when a sensor needs urgent replacement.
Technical Specifications
The table below summarizes the core specifications of the Setra 264 low differential pressure transducer.
| Parameter | Specification |
|---|---|
| Model | Setra 264 |
| Pressure Ranges | 0.1 in. W.C. to 100 in. W.C. FS (unidirectional and bidirectional) |
| Accuracy | ±1.0% FS standard; ±0.4% FS, ±0.25% FS optional |
| Output | 0 to 5 VDC (3-wire) or 4 to 20 mA (2-wire) |
| Excitation | 9 to 30 VDC |
| Overpressure | Up to 10 PSI (range dependent) |
| Long-Term Stability | 0.5% FS/year |
| Operating Temperature | 0°F to +175°F (-18°C to +79°C) |
| Compensated Temperature Range | 0°F to +150°F (-18°C to +65°C) |
| Media Compatibility | Clean air or similar non-conducting gases |
| Case Material | Fire-retardant, glass-filled polyester (UL 94 V-0) |
| Pressure Fittings | 3/16 in. O.D. barbed brass for 1/4 in. push-on tubing |
| Electrical Termination | Screw terminal strip (T1) or 1/2 in. conduit enclosure (A1) |
| Weight | Approx. 10 ounces |
| Warranty | 3-year unconditional |
Request a Quote for Setra 264 Low Differential Pressure Transducer
Seven Star LLC stocks the Setra 264 low differential pressure transducer for immediate quotation, technical datasheet download, and formal RFQ submission. As the authorized partner for Setra Systems in Oman and the GCC, we supply genuine, factory-calibrated units from regional warehouse stock, with our instrumentation division on hand to confirm range, output, and termination options for your specific BAS or process application. Contact Seven Star LLC today to request a quote or speak with an engineer about deploying the Setra 264 across your facility.
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