Pirani & Hot Cathode Ionization Sensor. These Leybold IONIVAC ITR 90 gauges are a combination of Pirani and Bayard-Alpert (hot cathode ionization) sensors. They come with KF-25 vacuum flange fittings and have a single filament. They measure vacuum pressure from 750 to 3.8x10-10 Torr (1000 to 5×10-10 mbar). The Leybold IONIVAC ITR 90 is designed for vacuum measurement of non-flammable gases and has an output pressure signal that is logarithmic. These Leybold IONIVAC ITR-90 gauges can be operated in connection with the TURBOLAB 80 or with another evaluation unit. These items have Leybold part number 12 091. The manual and brochure is available for download below.

This is a replacement cell for the Leybold IONIVAC ITR 90 Full Range Combination Pirani & Hot Cathode Ion Gauge with KF25, NW25 flange.

This is a replacement Sensor for the Leybold ITR 100 Full Range Combination Pirani & Hot Cathode Ion Gauge with KF25, NW25 flange.

Leybold cable connects the ITR 90 BA/Pirani Sensor Gauge to TurboLab 80 vacuum pump systems and to the Leybold Graphix Pressure 123 Controllers. They are 16.5 foot long (5 meter) (this is the cable ONLY, ITR 90 BA/Pirani Sensor Gauge and TurboLab 80 vacuum pump system and Graphix Controllers sold separately.)

These ITR 90 gauge kits (with IONIVAC ITR 90 Pirani with a Bayard-Alpert -Hot Cathode Ionization- Sensor Gauge) are designed to work with Leybold TURBOLAB 80 System. The functions of the Leybold IONIVAC ITR 90 gauge with a Bayard Alpert hot cathode ionization measurement system (for p mbar) and a Pirani measurement system (for p 5.5×10 mbar) pressure range 750 Torr to 3.8x10 Torr. In the overlapping pressure range of 2.0×10- … 5.5×10- mbar a mixed signal of the two measurement systems is output. The hot cathode is switched on by the Pirani measurement system only below the switching threshold of 2.4×10 mbar (to prevent filament burn-out). It is switched off when the pressure exceeds 3.2×10