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www.thinkSRS.com 1 PG105 Convection Enhanced Pirani Gauge The SRS PG105 is a convection-enhanced Pirani gauge (CEPG) manufactured by Stanford Research Systems. When used with an IGC100 controller the PG105 provides a convenient, reliable and low-cost measurement of vacuum over a wide pressure range extending from atmosphere to 10-4 Torr. This appendix provides a detailed description of the principle of operation, construction, gas dependence, calibration and fundamental strengths and weaknesses of the PG105 gauge head. Application examples and a few practical tips are provided along the way. Basic maintenance and troubleshooting information are also included. Since it is not possible to cover this complex gauge in such a short note, a comprehensive list of references is provided at the end. In This Application Note Principle of Operation 3 Contamination 13 Cleaning 14 Construction 6 Materials 14 Calibration 8 Cleaning Procedure 14 Bakeout 15 Accuracy and Stability 9 -3 Application Examples and Tips 15 Operation Below 10 Torr 10 Safety Considerations 17 Mounting Orientation 10 Explosive Gases 17 Compression Mounts 17 Mounting Recommendations 11 Overpressure Risks 18 Handling 11 Grounding 18 Location 11 Temperature 12 Electrical Connection 19 Vibration 12 Grounding 12 PG105 Gauge Test Procedure 20 Compression fittings 12 References 21 1/8 NPT Fittings 12 Other Fittings 12 (408)744-9040 Stanford Research Systems www.thinkSRS.com 2 PG105 Convection Enhanced Pirani Gauge Stanford Research Systems