Hanna Instruments HI 8000 Series - Manual (Page 15)

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- To erase all statistics, use panel S 61 (ERASE STATISTICS). Statistics indi-
cates pH and conductivity averages for all irrigation programs and sectors
in addition to average total irrigation accumulation.
- To erase the settings of one irrigation program or to erase all settings for all
irrigation programs, use panel S 62 (ERASE SETTINGS).
3.9 ALARMS
The Fertigation Controller has the capability to supervise and generate an alarm
for the following conditions:
- Conductivity sensor out of range. Reference, minimal and maximal offset
and threshold for conductivity alarm are set using panel S 41 (COND
CONTROL). The current values of conductivity sensors are displayed on
panel C 05 (EC STATE)
- A difference greater than the set value between the first and second con-
ductivity sensors; Maximum value of difference is set using panel S 55
(SENSORS CONFIG)
- pH sensor out of range. The reference, minimum and maximum offset and
threshold for pH alarm are set using panel S 40 (PH CONTROL). The
current values of pH sensors are displayed on panel C 04 (pH STATE)
- A difference greater than the set value between pH sensors; the maximum
difference value is set using panel S 55 (SENSORS CONFIG)
- Problems with the water supply
- Dirty filters
When the level is low in the fertilizer and acid tanks the system will take appro-
priate action and record the alarm. These actions can be:
- in case of a pH alarm condition, the irrigation process can be suspended
or continued depending on the choice set within panel S 52 (ALARM
BEHAVIOR) depending on the choice set within.
- in case of an EC alarm condition, the irrigation process can be suspended
or continued depending on the choice set within panel S 52 (ALARM
BEHAVIOR) depending on the choice set within.
- in case of a dirty filter alarm condition, start the filter cleaning program in
accordance with the priority and working time settings
- in case of a water supply alarm situation, the Controller will stop every
irrigation process until the alarm is shot off.
All alarm situations are displayed on panel C 25 (ALARM).
All anomalies (old alarm conditions) are displayed on panel C 27 (ANOMALY).