390511-2-YK-T is a configured MKS Granville-Phillips Series 390 Micro-Ion ATM vacuum gauge module. The official Series 390 ordering matrix decodes this configuration as RS-485/analog communication with a local display, two set-point relays, yttria-coated iridium filaments, an NW40 ISO-KF vacuum connection, and Torr measurement units. The Series 390 combines ionization, heat-loss, and diaphragm sensing for continuous measurement from high vacuum to atmosphere
Configurations vary. Verify the exact unit before choosing a replacement.
Granville-Phillips Series 390 Micro-Ion ATM modular vacuum pressure transducer
Configuration
Base module
RS-485/analog interface with local graphical LCD display
Set-point relays
2
Verification boundary
Confirm the complete 390511-2-YK-T label before replacement; neighboring Series 390 suffixes can specify different relay counts, filaments, fittings, displays, interfaces, or pressure units
Sensor
Ionization gauge filament
Yttria-coated iridium
Mechanical
Vacuum connection
NW40 ISO-KF
Measurement
Pressure units
Torr
Absolute measurement range
1 x 10^-9 Torr to atmosphere, for air or nitrogen
Differential measurement range
-750 to +250 Torr
Electrical
Analog output
Absolute pressure: logarithmic 0.5 to 7.0 VDC at 0.5 V per decade; differential pressure: linear 1 to 5 VDC over -750 to +250 Torr
