SMC Networks PFMC7501-L Operation Manual page 70

○Key-lock function
The key-lock function is used to prevent errors occurring due to unintentional changes of the set values. If
the SET button is pressed while the keys are locked, [LoC] is displayed on the sub screen (left side) for
approximately 1 second.
(Each setting and peak/bottom values are displayed with UP and DOWN buttons.)
<Operation - Without security code input ->
(1) Press the SET button for 5 seconds or longer in measurement mode. When [oPE] is displayed on the
main screen, release the button.
The current setting [LoC] or [UnLoC] will be displayed on the sub screen.
(To release key-lock repeat the above operation.)
(2) Select the key-locking/un-locking with UP or DOWN button, and press the SET button to set.
<Operation – With security code input ->
•Locking
(1) Press the SET button for 5 seconds or longer in measurement mode. When [oPE] is displayed on the
main screen, release the button.
The current setting [LoC] or [UnLoC] will be displayed on the sub screen.
(2) Select the key [LoC] with UP or DOWN button, and press the SET button to set.
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No.PF※※-OMY0002