The KELLER PAA-33X Piezoresistive Absolute Pressure Transmitter (Product Identification Number: 233345.0037) represents a premium-grade, high-precision industrial instrumentation platform engineered and manufactured by KELLER Druckmesstechnik (Switzerland)—the global pioneer and standard-setter in piezoresistive silicon pressure sensing technology. The Series 33X transmitter is highly distinguished in the automation sector by its embedded microprocessor-based digital electronics core, which facilitates mathematical linearity and thermal error compensation algorithms with exceptional analytical precision. The instrument quantifies absolute pressure across a standard range of 0 to 10 bar, utilizing an internally sealed high-vacuum reference chamber within the sensor capsule architecture. This configuration guarantees that the returned telemetry remains completely isolated from volatile atmospheric barometric shifts, delivering an ideal measurement roadmap for critical process control networks, petrochemical processing complexes, automated pneumatics leak testing beds, food-grade manufacturing utilities, and advanced municipal water management grids demanding uncompromised system uptimes.

The core technological edge distinguishing the KELLER PAA-33X centers on its integrated Dual-Output architecture, packaging a traditional analog 4...20 mA current loop (2-wire system) alongside a high-speed digital RS485 serial communication interface (supporting Modbus RTU protocols) on a single physical unit. This unique layout empowers instrumentation and control engineers to drive legacy analog PLC switchboards while simultaneously tapping deep digital bus networks for real-time remote diagnostics, programmatic scaling, zero-point adjustments, and sensor recalibration without decommissioning the device from the pipeline. Boasting an accuracy class of 0.05% FS at room temperature and an expanded active thermal compensation band spanning -10 to 80°C, the transmitter entirely neutralizes temperature-induced signal drift errors. The structural enclosure is meticulously machined from high-tensile premium stainless steel, bundled with an industrial Binder Series 723 (5-pin) electrical quick-disconnect interface under rigorous IP67 environmental ingress protection standards. This ensures uninterrupted 24/7 continuous operations under dense multi-axis physical shock, severe machinery vibration ripples, and corrosive heavy industrial chemical environments.

• Manufacturer: KELLER (Keller Druckmesstechnik)
• Country of Origin: Switzerland
• Product Category: Piezoresistive Absolute Pressure Transmitter
• Product Line Family: KELLER Series 33X
• Product Inventory Number (Product No.): 233345.0037
• Model Designation: PAA-33X / 10bar / 80794
• Standard Measuring Range: 0…10 bar abs (Absolute Pressure configuration)
• Output Configuration Matrix: Dual-Output integrating Analog 4...20 mA (2-wire) and Digital RS485 (Modbus RTU)
• Sensing Accuracy at Room Temperature (RT): ± 0.05% FS (Full Scale)
• Total Error Band Analog Signal Loop: ± 0.15% FS (Within the thermal band -10...80°C)
• Total Error Band Digital Signal Loop: ± 0.1% FS (Within the thermal band -10...80°C)
• Compensated Thermal Range limits: -10°C to +80°C
• Operating Temperature Limits: -40°C to +120°C
• Mechanical Pressure Port Interfacing: Standard G ¼ thread configuration
• Electrical Termination Interface: Binder Series 723 Quick-Disconnect 5-pin circular connector (Binder 723 / 5-pin)
• Auxiliary Operating Supply Input: 8…32V DC range (Incorporates reverse polarity protection circuitry)
• Environmental Ingress Protection: Certified to IP67 standard specifications (Total fine dust isolation and short-term submersion proof)
• Structural Enclosure Material: Premium industrial-grade heavy-duty Stainless Steel construction