ULT20 - User’s manual_rev.A
29
AL_L – Lower threshold of alarm (OverLo Al) – lower value of the relay contacts state
change
AL_P – Upper threshold of alarm (OverHi Al) – upper value of the relay contacts state
change.
Note: During alarm configuration, be sure to put the threshold values which meet
the correlation AL_L <AL_P. Failure to meet this correlation will disable alarms. In
the case of damage to the measuring head (no communication with the head) the
process of re-initializing of the head begins where the alarms state remains in the
previous position.
In addition, alarm functions have been equipped with programmable delay of the alarm
activation and deactivation. The User can specify how long the minimum time of duration
of an alarm event before the alarm relay contacts are triggered and the minimum time of
the alarm event decay before the relay contacts are activated.
Alarm activation can be remembered if the memory function is enabled.
5.4.5 LCD display
ULT20 transducers are equipped with backlit graphic LCD display with adjustable
brightness of backlight and adjustable contrast. The display resolution is 128 x 64 points.
Measured and calculated parameters are displayed on the defined screens. Upper status
bar is displayed on each screen which shows the status of the alarm, the measuring head
temperature and the current time. Views of sample screens are shown in the figures
below. In addition, the screen with measured values contains bar graphs which graphically
Fig. 12. Alarm types: a) n-on; b) n-off; c) on; f) off.
