Vaisala MMT330 - Manual (Page 73)

Chapter 4 _________________________________________________________________ Operation
VAISALA ________________________________________________________________________ 73
When you want to turn off the PIN lock, go to the menu by giving the
PIN code and select System, Menu PIN, press OFF button.
In case you have forgotten the PIN code, open the transmitter cover and
press the ADJ button once. Wait for a few seconds and the adjustment
menu opens. Select Clear menu PIN, press
CLEAR.
NOTE You can also disable the keypad completely with serial command
LOCK. See section Locking Menu/Keypad Using Serial Line on page
105.
Factory Settings
Use the display/keypad to restore the factory settings. This operation
does not affect the adjustments. Only settings available in the menus are
restored.
1. Press any of the arrow buttons to open the Main Menu.
2. Select System
by pressing the ► arrow button.
3. Select Factory settings and press the REVERT button to confirm
your selection. Press the YES button to reset all settings to the
factory defaults.
See section General Settings on page 97 for a description of the other
menu options.
Display Alarms
The Display Alarm feature provides two independently configurable
alarms for transmitters with the display/keypad option. Each alarm tracks
a selected quantity, with freely configurable limit values. Each alarm also
has a configurable hysteresis value to prevent unnecessary triggering
when the measurement fluctuates around an alarm limit. The alarms can
be configured for any quantity supported by the transmitter. The
configuration of the Display Alarms can only be done using the
display/keypad option.
You can have the alarm activate inside or outside the specified range by
setting the limits correctly:
- To have the alarm activate when the measured quantity is outside the
specified range, set the Act. above limit higher than the Act. below
limit.
- To have the alarm activate when the measured quantity is inside the
range, set the Act. above limit lower than the Act. below limit.