PFEIFFER PKR 251 (D-35614) Compact Full Range Vacuum Gauge – PKR Series
Imagine a critical vacuum process suddenly losing pressure integrity — a coating line halts, a semiconductor chamber vents unexpectedly, or a leak-detection system goes blind across a decade-wide pressure range. Without a reliable, wide-range vacuum gauge capable of measuring from atmospheric pressure down to ultra-high vacuum in a single instrument, operators are forced to switch between multiple sensors, introducing dead zones, calibration mismatches, and costly downtime. The PFEIFFER PKR 251 eliminates this vulnerability entirely.
The PKR 251 (Part No. D-35614) occupies a flagship position within PFEIFFER VACUUM’s PKR Compact Full Range Gauge series — a product line engineered for demanding industrial and scientific vacuum environments. Combining a Pirani thermal conductivity sensor with a cold cathode ionization gauge in a single compact housing, the PKR 251 delivers seamless, uninterrupted pressure measurement from 5×10⁻⁹ mbar to 1,000 mbar — a range of twelve decades. Trusted by vacuum engineers across semiconductor fabrication, thin-film coating, analytical instrumentation, and research facilities worldwide, the PKR 251 is a benchmark instrument in global industrial automation markets.
Technical Specifications
- Model / Part No.: PKR 251 / D-35614
- Manufacturer: PFEIFFER VACUUM GmbH
- Series: PKR – Compact Full Range Gauge
- Measurement Principle: Pirani (thermal conductivity) + Cold Cathode (ionization)
- Measurement Range: 5×10⁻⁹ mbar to 1,000 mbar (12 decades)
- Gas Type: N₂ / Air (correction factors available for other gases)
- Output Signal: Analog voltage output (0–10 V logarithmic)
- Process Connection: DN 25 ISO-KF (NW25) flange
- Operating Temperature: 15°C to 40°C
- Bakeout Temperature: Up to 120°C (gauge head)
- Power Supply: 24 VDC (via controller or display unit)
- Compatible Controllers: TPG 261, TPG 262, MaxiGauge, DigiLine
- Housing Material: Stainless steel
- Weight: Approx. 0.35 kg
- Certifications: CE marked
Key Features & Benefits
- 12-Decade Measurement Range: Covers rough, medium, high, and ultra-high vacuum in one sensor — eliminating the need for multiple gauges and reducing system complexity.
- Dual-Sensor Technology: Seamless automatic switchover between Pirani and cold cathode modes ensures continuous, gap-free measurement across the full pressure range.
- Compact, Robust Design: The all-stainless-steel housing withstands aggressive industrial environments, vibration, and repeated bakeout cycles.
- Analog Output Compatibility: The 0–10 V logarithmic output integrates directly with PLCs, SCADA systems, and data acquisition hardware without additional signal conditioning.
- Long Service Life: Cold cathode technology has no filament to burn out, dramatically extending operational lifetime compared to hot cathode alternatives.
- Easy System Integration: Standard DN 25 ISO-KF flange and PFEIFFER controller ecosystem enable plug-and-play installation in new and existing vacuum systems.
Industry & Equipment Applications
- Semiconductor & Microelectronics: CVD, PVD, ion implantation, and etch chamber pressure monitoring.
- Thin-Film Coating: Optical coating, hard coating, and decorative PVD systems requiring stable process vacuum.
- Analytical Instrumentation: Mass spectrometers, electron microscopes (SEM/TEM), and surface analysis systems.
- Research & Development: University and national laboratory vacuum chambers, accelerator beam lines.
- Industrial Leak Detection: Helium leak detectors and vacuum integrity testing systems.
- Freeze Drying & Pharmaceutical: Lyophilization process vacuum control.
System Integration & Compatible Parts
The PKR 251 is designed to operate within the PFEIFFER VACUUM ecosystem. Recommended compatible components include:
- Controllers: TPG 261 (single gauge), TPG 262 (dual gauge), MaxiGauge (multi-channel)
- Display Units: DigiLine display modules for direct readout
- Cables: PFEIFFER standard gauge cables (DN 25 KF to controller)
- Flanges & Fittings: DN 25 ISO-KF centering rings, clamps, and tee pieces
- Turbo Pump Systems: HiPace series turbomolecular pumps for system-level vacuum solutions
Konmask.com stocks a broad range of PFEIFFER VACUUM components. Contact us to source complete vacuum measurement assemblies.
Our Quality Assurance Process
Every PFEIFFER PKR 251 unit sourced through Konmask.com undergoes a rigorous multi-stage verification process before dispatch:
- Authenticity Verification: Cross-referenced against PFEIFFER VACUUM official part number databases (D-35614).
- Physical Inspection: Housing integrity, flange condition, connector pins, and labeling checked against OEM specifications.
- Documentation Review: Original manufacturer documentation, batch traceability, and CE declaration of conformity verified where available.
- Secure Packaging: Anti-static, shock-absorbing packaging with desiccant to protect sensitive gauge internals during international transit.
How to Order
- Submit an inquiry via the “Get a Quote” button or email support@konmask.com.
- Provide your required quantity, delivery destination, and any urgency requirements.
- Our technical team will confirm availability, lead time, and provide a formal quotation within 24 business hours.
- Upon order confirmation, we arrange secure international shipping with full tracking.
Why Choose Konmask.com?
- Industrial Automation Specialists: Focused exclusively on PLC, DCS, vacuum, and automation components — not a generalist marketplace.
- Global B2B Supply: Serving engineers and procurement teams across Europe, Southeast Asia, the Middle East, and the Americas.
- Technical Pre-Sales Support: Our engineers can advise on compatibility, system integration, and alternative part numbers.
- Competitive Lead Times: Extensive supplier network enables fast sourcing of both current and legacy PFEIFFER components.
- Secure Transactions: Professional B2B invoicing, export documentation, and compliance support.
Frequently Asked Questions
Q: What is the difference between the PKR 251 and PKR 361?
A: The PKR 251 uses a cold cathode ionization sensor for the high-vacuum range, while the PKR 361 uses a hot cathode (Bayard-Alpert) ionization gauge, offering slightly better accuracy at ultra-high vacuum but with a shorter filament lifespan. The PKR 251 is preferred for applications where low maintenance is critical.
Q: Can the PKR 251 be used without a PFEIFFER controller?
A: The PKR 251 requires a compatible PFEIFFER controller (e.g., TPG 261/262) or a DigiLine display unit to power the gauge and read the output. The analog 0–10 V signal can be logged independently by a PLC or DAQ system once the gauge is powered.
Q: Is the PKR 251 (D-35614) still in production?
A: PFEIFFER VACUUM has transitioned some PKR series models. Konmask.com maintains stock of both current-production and legacy units. Contact us to confirm current availability for your specific requirement.
Q: What gases can the PKR 251 measure?
A: The PKR 251 is calibrated for N₂/Air. Correction factors are available for noble gases (Ar, He), H₂, and other process gases. Consult the PFEIFFER operating manual or our technical team for gas-specific correction values.
Q: What is the minimum order quantity?
A: Konmask.com supplies from single-unit inquiries to bulk procurement orders. There is no minimum order quantity for standard B2B inquiries.
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