Hach-Lange POLYMETRON 9245 User Manual - Manual (Page 79)

77
User Setup
7.3.1 Alarms 1 and 2
Table 3 Alarms 1 and 2 parameters
Value Description
Mode
Limit
Trigger the alarm when the measurement is above or below a
pre-defined limit
Sample flow Trigger the alarm when the sample flow rate is too low
Active channel
Trigger the alarm when the channel is active i.e. during the
measurement cycle
None Alarm not required
Attributes Channel 1 Defines the channel number on which the alarm is triggered
Limit nnnn Define the limit when the alarm should be triggered
Direction
Up Trigger alarm when measurement is above the limit
Down Trigger alarm when measurement is below the limit
Delay nnn seconds The delay (in seconds) before the alarm is activated
Hysteresis nn% Hysteresis %
Relay
N.O. Normally open
N.C. Normally closed
Depending on the mode set, a different screen will be
displayed.
The example left shows the Limit mode screen.
The example illustrated indicates that alarm number 2 is set
up on Channel 1, and the alarm is triggered after a delay of 15
seconds when a measurement of 21.00 ppm is exceeded.
With the mode set to either Active Channel or Sample Flow,
you only have the possibility of setting the relay, as illustrated
left.