Pfeiffer PKR 251 Full Range Gauge Pirani Cold Cathode Transmitter

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If possible perform a leak test (leak rate 9.5 V "Error high". The green lamp is ON and the identification indicates Pirani-only mode (measuring signal continually > 4.0 V) "Pirani underrange". Measuring signal continually > 5 V or display > 10 -3 mbar although vacuum pressure is OK. Pirani measurement element defective (filament rupture). Electronics unit not correctly mounted. The cold cathode discharge has not ignited. The PKR has only been activated with p < 3×10 -9 mbar Pirani measurement circuit not adjusted, e.g. due to severe contamination. Measurement of heavy gases. Severe outgassing in the measuring chamber. Replace the Pirani element (→ 18). Mount the electronics unit correctly (→ 19). Wait until the gas discharge ignites (in case of contamination with insulation layers, the cold cathode may completely fail to ignite). (Cleaning → 18). Slightly increase the pressure. Readjust the Pirani measurement circuit (→ 15). If adjustment is impossible, replace the Pirani element. Convert with the corresponding formula (→ 27). Clean the measuring chamber. Measuring signal unstable. Gauge contaminated. Clean the gauge (→ 18). 20 BG 805 155 BE / C (2008-04) PKR 251
6 Removing the Gauge From the Vacuum System DANGER DANGER: contaminated parts Contaminated parts can be detrimental to health and enviroment. Before you begin to work, find out whether any parts are contaminated. Adhere to the relevant regulations and take the necessary precautions when handling contaminated parts. Caution Caution: vacuum component Dirt and damages impair the function of the vacuum component. When handling vacuum components, take appropriate measures to ensure cleanliness and prevent damages. Procedure Deactivate the gauge. Unplug the connector. VACUUM Compact FullRange TM Gauge Remove the gauge from the vacuum system. Place the protective cap. BG 805 155 BE / C (2008-04) PKR 251 21
Page 1 and 2: Operating Instructions Compact Full
Page 3 and 4: Product Identification In all commu
Page 5 and 6: 1.4 Liability and Warranty Pfeiffer
Page 7 and 8: Operating voltage (in the measuring
Page 9 and 10: 3 Installation 3.1 Installation Cau
Page 11 and 12: 3.2 Electrical Connection 3.2.1 Use
Page 13 and 14: 4 Operation As soon as the required
Page 15 and 16: 5 Maintenance Gauge failures due to
Page 17 and 18: 5.2.1 Disassembling the Gauge 2 3 4
Page 19: Dry the tube (e.g. with a blow drye
Page 23 and 24: 9 Spare Parts When ordering spare p
Page 25 and 26: Appendix A: Measuring Signal vs. Pr
Page 27 and 28: B: Gas Type Dependence Indication r
Page 29 and 30: Declaration of Contamination The se
Page 31 and 32: Notes BG 805 155 BE / C (2008-04) P

Pfeiffer PKR 251 Full Range Gauge Pirani Cold Cathode Transmitter

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