YSI IQ SensorNet DIQ/CR3 - Manual (Page 17)

MIQ/CR3; DIQ/CR3 Settings
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4.1.2 Limit indicator
With a limit indicator, a relay switches when a specified limiting value is
exceeded or undercut.
Limit indicators can be used in the following way:
 Monitoring a limiting value using a relay:
when a limiting value (upper or lower limiting value) is exceeded or
undercut, a relay switches. The Open or Close relay actions are
possible in each case (see page 4-4).
 Monitoring two limiting values using two relays:
If the upper limiting value is exceeded or undercut, a relay switches,
and if the lower limiting value is exceeded or undercut, another relay
switches. The Open or Close relay actions are possible in each case
(see page 4-4).
Note
If the simple monitoring function (Open, Close) with one or two relays
is not sufficient, use proportional output (see section 4.1.3).