PENNINGVAC Sensor PR 25 - DN 25 ISO-KF

Passive Gauge

Unlike active gauges, in passive gauges only the sensor is included, while the electronics are excluded. Passive measurement devices completely separate the measurement part from the driver electronics. The head attached to the system contains only the parts needed for the physical measurement and all other electronics are contained in the control unit. Usually, the control units are also fitted with analog voltage outputs, switch-point relay contacts and digital interfaces.

Passive gauges offer direct measurement of the sensor signal and the cable has an influence on the measuring signal. They require particular cables according to indicator type.

The controller is also the measuring device, so that the power supply only comes from the controller. In a similar fashion, the display is located uniquely on the controller.

Passive gauges are tolerant of radiation and high bakeout temperatures are possible, in contrast to active gauges.

THERMOVAC TR Series (Pirani / Thermal Conductivity): Meant for rough to medium vacuum levels (1000 mbar down to approx. 5 × 10⁻⁴ mbar). Common variants include the TR 211, TR 212, and TR 216.

PENNINGVAC PR Series (Cold Cathode / Ionization): Tailored for the high-vacuum region, tracking pressures into lower ranges without a hot filament. Key models include the PR 25, PR 26, PR 27, and PR 28.

IONIVAC IE Series (Hot Cathode / Bayard-Alpert): Explicitly optimized for ultra-high vacuum (UHV) applications, capable of measuring down to 1 × 10⁻¹² mbar. Key models include the IE 414 and IE 514 (Extractor gauge).

COMBIVAC CM: A controller for up to two passive Pirani gauges and one passive cathode gauge Vacuum gauges and pump controllers - Leybold Global.

IONIVAC IM: Tailored specifically for two passive hot cathode gauges to monitor UHV pressures Vacuum gauges and pump controllers - Leybold Global.

Features and Benefits

• Measurement from atmosphere to 10E-12 mbar - Gauge contains only sensor – measurement signal is processed by separate controller
• Advantage: Sensor is less sensitive to radiation and more bakeable
• Measurement cables up to 100m
• Automatic switching from THERMOVAC to Penning & UHV sensors