MKS 640A/641A, Manual, Page: 80 / 88

Appendix D: Model Code Explanation Model Code Description
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Appendix D: Model Code Explanation
Model Code Description
The model code number of your 640 Series Pressure Controller describes features of the unit,
such as the pressure range, fittings, seal material, and orifice size (flow range).
Type Number
Pressure Range
Fittings
Z
XXX
Y 64XA
Valve Type
Body Seal Material
Q R
Valve Orifice
Trip Points
Valve Plug Material
S T
Type Number (64XA)
The type number identifies your controller; either a 640A absolute pressure controller or 641A
gage pressure controller.