MKS 974B QuadMag Vacuum Transducer; KF25 (NW25 ISO-KF)
P/N: 974B-22034-0045
The MKS 974B QuadMag platform combines cold cathode (inverted magnetron) + MicroPirani (thermal conductivity) + piezo differential sensing to cover vacuum from atmosphere down into ultra high vacuum (family spec: about 1×10⁻⁸ to 1500 Torr).
Testing: unit was powered and checked across multiple decades; photos show the actual readings/tests:
~1E+2 Torr (higher-pressure end behavior)
~1E-2 Torr (mid-vac crossover region)
~1E-6 Torr (high-vac behavior)
Included: transducer only; exactly what’s shown.
Used condition; normal cosmetic wear; function verified as above (via displayed test evidence). May have some minor scratches or cosmetic imperfections.
MKS 974B, QuadMag, cold cathode gauge, inverted magnetron, MicroPirani, piezo transducer, load lock gauge, NW25 KF25 ISO-KF, vacuum pressure transducer.
