The Greystone Model UPF2AX Ultra Low Pressure Transducer, engineered and manufactured by Greystone Energy Systems Inc. in Moncton, New Brunswick, Canada, is an ultra-precise micro-differential pressure sensing instrument designed specifically for mission-critical environmental containment and building automation systems (BAS/BMS).

Unlike conventional differential pressure transmitters designed for wide spans across several hundred or thousand Pascals, the UP Series focuses on ultra-low, micro-pressure differentials (measured in fractions of an inch water column or down to tens of Pascals). These microscopic pressure gradients are essential for preventing cross-contamination in medical isolation wards, pharmaceutical clean manufacturing suites, and high-tech semiconductor fabrication plants.

Model Code Breakdown & Configuration (UPF2AX):
- UP: Ultra Low Differential Pressure Transducer Series.
- F: Heavy-duty grey polycarbonate enclosure featuring a hinged gasketed cover with a secure snap latch, supplied complete with an integrated 1/2" NPT to M16 thread adapter and a liquid-tight cable gland fitting.
- 2: Multi-range micro-pressure span covering field-selectable ranges: ±0.25 “WC, ±0.125 “WC, ±60 Pa, or ±30 Pa via on-board DIP switches.
- A: Analog output architecture (Field-selectable: 4-20 mA, 0-5 Vdc, or 0-10 Vdc).
- X: Standard configuration with No Mechanical Relays (No Relay).

Key Engineering Features & Operational Advantages:
- High-Sensitivity Silicon Piezoresistive MEMS Technology: Incorporates an ultra-sensitive micro-machined silicon diaphragm sensor engineered to detect minute pressure differentials down to fractions of a Pascal with virtually zero positional sensitivity. Active temperature compensation across 0°C to 50°C maintains a calibrated accuracy of ±1% F.S.O. with minimal long-term drift.
- Field-Selectable Multi-Range Versatility: Provides 4 user-selectable bidirectional micro-pressure ranges (±0.25 “WC, ±0.125 “WC, ±60 Pa, ±30 Pa) easily configured via on-board DIP switches. This eliminates stocking multiple part numbers and allows field technicians to fine-tune sensitivity to match exact facility pressurization regimes.
- 3-in-1 Universal Analog Output: Features on-board switch selection between 4 to 20 mA current loop (2-wire connection) or 0 to 5 VDC / 0 to 10 VDC voltage outputs (3-wire connection), ensuring effortless integration with any commercial DDC controller, PLC platform, or BMS system.
- Pushbutton Auto-Zero Functionality: Equipped with a tactile pushbutton on the electronics board. With both ports vented to ambient atmospheric pressure, depressing the auto-zero button for several seconds causes the internal processor to calculate and store a new zero reference point, eliminating manual potentiometer calibration.
- Heavy-Duty Weatherproof IP65 / NEMA 4X Enclosure (F-Style): Molded from UL94-V0 flame-retardant, UV-resistant grey polycarbonate with a continuous perimeter silicone gasket. The hinged lid design with a snap latch facilitates rapid one-handed field wiring without dropped cover screws. Supplied complete with a 1/2" NPT to M16 thread adapter and liquid-tight cable gland.

Typical Industrial Applications:
- Cleanroom positive pressure containment in semiconductor wafer fabrication, optical coating, and pharmaceutical GMP facilities.
- Hospital negative pressure isolation suites (infectious airborne pathogen containment), surgical operating rooms, and protective environment suites.
- High-containment biological research laboratories conforming to BSL-3 and BSL-4 biosafety standards.
- Micro-differential static pressure control in specialized pharmaceutical air delivery ductwork.
- Fume hood sash velocity monitoring and laboratory exhaust tracking.

• Manufacturer: Greystone Energy Systems Inc.
• Country of Origin: 100% Canada (Made in Canada)
• Product Line: UP Series Ultra Low Pressure Transducers
• Model Designation: UPF2AX
• Sensing Element: Ultra-sensitive Silicon Piezoresistive MEMS sensor
• Measured Media: Clean dry air or non-corrosive, non-conductive inert gases
• Operating Pressure Ranges (DIP Switch Selectable):
  - Imperial Ranges: ±0.25 “WC, ±0.125 “WC
  - Metric Ranges: ±60 Pa, ±30 Pa
• Measurement Accuracy: ±1% F.S.O. (Full Scale Output) across selected range
• Response Time: 250 milliseconds (250 ms)
• Long-Term Stability: < ±1% F.S.O. per year
• Thermal Effects: < ±3% over compensated temperature range
• Compensated Temperature Range: 0°C to 50°C (32°F to 122°F)
• Proof Pressure: 40” W.C. (~10 kPa)
• Burst Pressure: 120” W.C. (~30 kPa)
• Analog Output Signals (Field-Selectable):
  - Current Loop: 4 - 20 mA (2-wire configuration)
  - Voltage Output: 0 - 5 Vdc or 0 - 10 Vdc (3-wire configuration)
• Output Drive Capability:
  - Current Loop: 400 Ω maximum @ 24 Vdc
  - Voltage Output: 10 kΩ minimum
• On-Board Relays: None (No Relay - Option X)
• Zero Calibration: Pushbutton auto-zero functionality on-board
• Power Supply Requirements: 20 to 28 Vac/dc (non-isolated half-wave rectified)
• Current Consumption: Current mode: 20 mA maximum; Voltage mode: < 4 mA
• Protective Circuitry: Reverse polarity protected and output current limited
• Pneumatic Pressure Ports: Dual 6.35 mm (0.25") Nylon barb fittings compatible with 3.175 mm to 4.762 mm (1/8" to 3/16" ID) flexible tubing
• Electrical Connections: Screw terminal block accommodating 14 to 22 AWG wiring
• Cable & Conduit Entry: 1/2" NPT knockout with included 1/2" NPT to M16 adapter and liquid-tight cable gland
• Enclosure Construction: Grey Polycarbonate, UL94-V0 flame retardant, hinged cover with latch and perimeter gasket
• Ingress Protection Rating: IP65 / NEMA 4X (dust-tight and water-jet resistant)
• Ambient Operating Conditions: 0°C to 50°C (32°F to 122°F), 5% to 95% RH non-condensing
• Regulatory Compliance: CE marked, RoHS compliant, ISO 9001 certified manufacturing
• Unit Net Weight: Approximately 250 g (8.8 oz).