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Interval Timer Setup
MODEL 54e pH/ORP SECTION 5.0
SOFTWARE CONFIGURATION
5.7 CHANGING ALARM PARAMETERS (continued)
7. Menu Item Options
Timer (enable) Disable/AL1/AL2/AL3
Interval 0-999.9 hr
Repeats 1-60
On time 1-2999 sec
Off time 0-2999 sec
Recovery 0-999 sec
The Interval Timer is used to automate a relay closure sequence
based on a time interval. See Figure 5-2 for examples. The original
controller configuration disables the timer, so the first step in using
the timer is to select an alarm relay (1, 2, or 3), which will enable the
feature. All parameters can be adjusted by highlighting the desired
item and pressing the Edit 4 key. Once Edit has been pressed,
change the item as needed and then press Save 4 to store the
value.
NOTE
The alarm relay selected for Interval Timer cannot be
used for other purposes such as a process or tempera-
ture alarm. While a timer sequence is occurring, both
current outputs will be placed in hold (even if hold was
not enabled in Section 5.6) and the other 2 alarms will be
placed in their default states.
"Interval" determines how often the timer sequence will run. When set to
24 hours, the sequence will run daily.
"Repeats" is the number of times the relay will activate during the
sequence.
"On time" is the number of seconds the relay will stay closed (on) during
each repeat.
"Off time" is the number of seconds the relay will stay open (off) between
each repeat.
"Recovery" is a waiting period after the activation sequence that allows
sensor readings to return to normal before outputs and alarm relays are
taken out of the hold/default states.
For more on the Interval Timer, see Section 6.0, Theory of Operation.
NOTE
The timer can be used for periodic chemical or mechan-
ical cleaning of a coated sensor. If high reference imped-
ance is used to initiate the timer cycle, the reference
impedance set point in Section 5.8 is used.
Timer: Disable
Timer: Time activated
Interval: 24.0 hr
Exit Edit
Repeats: 1
On time: 120 sec
Off time: 1 sec
Exit Edit
On time: 120 sec
Off time: 1 sec
Recovery: 600 sec
Exit Edit