MKS 640A/641A, Manual, Page: 83 / 88

Model Code Description Appendix D: Model Code Explanation
70
Valve Orifice Size (R)
The 640 Series controller is available with one of six valve orifice sizes, defined by a single entry
in the model code.
Valve Orifice Size Selection
Valve Orifice
Number
Valve Orifice
Size
Order
Code
A 50 A
1 200 1
2 1000 2
3 5000 3
4 10,000 4
5 20,000 5
6 50,000 6
Table 16: Valve Orifice Size Selection
Trip Points (S)
The 640 Series controller can be built with or without trip points; the choice is designated by a
single number in the model code.
Trip Points
Trip Points Order Code
With 1
Without 2
Table 17: Trip Point Model Code Entry