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General| Sensor Type | Pirani / Cold Cathode |
|---|---|
| Flange | DN 25 ISO-KF |
| Protection Category | IP40 |
| Measurement Range | 1 x 10-9 ... 1000 hPa |
| Output Signal | Analog 0-10 V |
| Power Supply | 24 V DC |
| Weight | 0.4 kg |
| Inlet Flange | KF 16 |
| Outlet Flange | KF 16 |
| Voltage | +24 V DC |
| Dimensions (L x W x H) | 96 x 48 x 120 mm |
Information about which products this document applies to.
Describes the primary application and pressure range of the PKR 251 gauge.
Explains the operating principle of the gauge, combining Pirani and cold cathode systems.
Explains the meaning of warning symbols (Danger, Warning, Caution) used in the document.
Specifies the necessary qualifications for personnel operating the product.
Provides critical safety instructions regarding process media, contamination, and magnetic fields.
Outlines conditions under which Pfeiffer Vacuum's liability and warranty are voided.
Lists admissible temperatures, relative humidity, and use conditions.
Defines measurement range, accuracy, reproducibility, and gas type dependence.
Covers adjustment, protection type, max pressure, supply, and electrical connection.
Provides step-by-step instructions for installing the gauge.
Highlights safety warnings related to overpressure and electrical connections during installation.
Details the procedure for removing the magnet unit from CF flanged gauges.
Highlights warnings regarding electric arcing and magnetic force during magnet unit removal.
Explains how to connect the gauge to measurement or evaluation units.
Explains how the gauge operates and measures pressure across different ranges.
Discusses how different gases affect pressure readings.
Describes the delay time for the cold cathode system's ignition.
Explains how contamination impacts performance and provides mitigation advice.
Provides detailed instructions for adjusting the gauge's Pirani measurement circuit.
Highlights safety warnings related to contaminated parts during gauge adjustment.
Outlines the process for cleaning the gauge and replacing components.
Highlights safety warnings related to cleaning agents and component handling.
Provides step-by-step instructions for disassembling the gauge.
Highlights warnings regarding electronics unit cover and magnetic force during disassembly.
Details the cleaning procedures for the measuring chamber, anode, and Pirani element.
Provides step-by-step instructions for reassembling the gauge.
Highlights warnings regarding anode centering during reassembly.
Provides a guide to diagnosing and resolving common gauge issues.
Details the steps for removing the gauge and associated safety precautions.
Instructions for returning the product for service, including contamination warnings.
Lists available accessories for the gauge and their ordering numbers.
Details how to order spare parts, sets, and individual components.
Provides warnings and guidance for environmentally responsible disposal.
Explains signal-pressure relationships with formulae, curves, and a conversion table.
Illustrates gas type effects on readings, including indication ranges and conversion formulas.
Space for users to record important remarks or observations.
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