Hach sc1000 - Manual (Page 95)

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Advanced Operations
6.3.3.4 Function set to 2 POINT CONTROL working mode
2 POINT CONTROL
SET TRANSFER
Default value: DE-ENERGIZED
Sets the status of the relay (ENERGIZED/DE-ENERGIZED) if error conditions are detected in
the selected source or if the source is missing.
PHASE
Default value: HIGH
Sets the status of the relay. As soon as the process value enters the band between high and low
alarm, the relay state is not changed.
HIGH
Turns the relay ON when the process value exceeds the high alarm
Turns the relay OFF when the process value falls below the low alarm.
LOW
Turns the relay ON when the process value falls below the low alarm.
Turns the relay OFF when the process value exceeds the high alarm.
HIGH ALARM
Default value: 15
Sets the upper limit in the unit of the selected parameter of the 2 point control band.
LOW ALARM
Default value: 5
Sets the lower limit in the unit of the selected parameter of the 2 point control band.
ON DELAY
(0 s–999 s) Default value: 5 seconds
Sets a delay time for the relay to turn on.
OFF DELAY
(0 s–999 s) Default value: 5 seconds
Sets a delay time for the relay to turn off.
OnMax TIMER
(0 min–999 min)
Default value: 0 minutes (off)
Sets a maximum period of time. During this period the relay is turned ON when passing the
corresponding limit. As soon as the time expires the relay is turned OFF regardless of the
process value.
0=OnMax Timer is not active.
OffMax TIMER
(0 min–999 min)
Default value: 0 minutes (off)
Sets a maximum period of time (in minutes). During this period the relay is turned OFF when
passing the corresponding limit. As soon as the time expires the relay is turned ON regardless of
the process value.
0=OffMax Timer is not active.
OnMin TIMER
(0 min–999 min)
Default value: 0 minutes (off)
Sets a minimum period of time. During this period the relay is turned ON when passing the
corresponding limit. The relay can only be turned OFF after the period has expired and after this
expiration will be turned OFF dependent on the process value.
0=OnMin Timer is not active.
OffMin TIMER
(0 min–999 min)
Default value: 0 minutes (off)
Sets a minimum period of time. During this period the relay is turned OFF when passing the
corresponding limit. The relay can only be turned ON after the period has expired and after this
expiration will be turned ON dependent on the process value.
0=OffMin Timer is not active.
MAX TIMER EXPIRE
Default value: 0 seconds (off)
Indicates a period of time (in seconds) for the expiration of the OnMax TIMER and the OffMax
TIMER.
Relay turned on, OnMax TIMER activated: The time left is displayed before the relay is turned off
automatically.
Relay turned off, OffMax TIMER activated: The time left is displayed before the relay is turned on
again.