IGM401 Hornet™ Hot Cathode


IGM401 Hornet is InstruTech’s miniature hot cathode Bayard-Alpert ionization vacuum gauge module with a built-in controller and display.  The pressure measurement range of the IGM401 is 1.00E-09 to 5.00E-02 Torr.

IGM401 is available with various fittings including NW16KF, NW25KF, NW40KF,  1 1/3 in. Mini-Conflat, 2 3/4 in. Conflat, 3/4 in. O.D. Tube (O-ring compression) and 1/2 in. Cajon 8VCR female.


  • Wide measurement range of 1.00E-09 to 5.00E-02 Torr
  • Built-in controller with bright OLED digital display
  • User programmable display units in Torr, mbar or Pa
  • Auto-Ranging of emission current provides optimal and stabile pressure readings over the entire measurement range from low to high vacuum
  • 1 analog output and 1 setpoint relay
  • RS485 serial communications
  • Also a lower cost, plug-compatible direct drop-in replacement for the Granville-Phillips® 354 and 355 Micro-Ion®
  • CE and RoHS compliant
  • Standard warranty of 18 months
IGM401 Gauge Optional 24 Vdc Power Supply

Trademark Acknowledgements listed in the IGM401 Data sheet.