Hach-Lange POLYMETRON 9240 Basic User Manual - Manual (Page 16)

Note: If this value is set to zero, then no electrode reactivation will take place during the calibration process and
as such the calibration may be inaccurate. It is highly recommended to set this parameter to 24.
4. If set to a fixed date, define the day and time of the week when reactivation takes place. Set the
day of the week to an asterisk if reactivation is not to take place on that day.
Datalogger setup
1. Select the VIEW DATA option to display the requested data.
2. All information matching the parameters selected in the VIEW SETUP option is displayed on the
screen. If the data covers more than one screen, an Arrow key will be displayed at the bottom.
Use this key to scroll through the data.
3. Select the VIEW SETUP option to define the parameters for the data you wish to view.
4. The FROM data field is the date (DD/MM/YY) from which you want to start viewing data.
5. The AT data field is the time (HH:MM:SS format) from which you want to start viewing the data.
6. The CH field defines the channel for which you want to view the data.
7. If you wish to see the ALARMS information (both system and warning alarms), select Yes in this
field, or No if alarm information is not required.
Graph time base
For graphical displays, enter the number of hours as the base line for the graph.
Alarms
1. Select the ALARMS option to set up the parameters for all the alarms including the system and
warning alarms.
2. Select the alarm to set up.
3. General alarms:
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
Attributes Channel n 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 before the alarm is activated
Hysteresis nn% Hysteresis %
Relay
N.O. Normally open
N.C. Normally closed
4. Warning alarm:
Alarm
Yes Activate the warning alarm
No Deactivate the warning alarm
Accept
Manual When the alarm is triggered, turn it off by pressing the Enter function key
Auto
When the alarm is triggered, it will turn itself off only when the reason for the
alarm being triggered is no longer valid
16 English