Omron Programmable Terminals NT31 NT31C - Manual (Page 287)

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Appendix K
Option List
Replaceable Backlight ... NT31C-CFL01 (Used for Both NT31/NT31C)
This is a backlight (CFL unit) for replacement purposes.
Protective Sheet ... NT30-KBA04 (Used for Both NT31/NT31C)
Stuck to the display to prevent irregular reflection or contamination. The entire sheet is colorless and transparent.
The five sheets make a set.
Chemical-resistant Cover ... NT30-KBA01
Covers the front panel and protects it from various chemical agents. The entire sheet is milky white and made of
silicone rubber.